Petar is available for hire
Hire PetarPetar Simic
Verified Expert in Engineering
UX Prototyping Developer
Belgrade, Serbia
Toptal member since November 18, 2014
Bio
Petar has extensive experience in developing web applications and custom JavaScript libraries. He is a highly responsible team player and a passionate coder who is always looking for challenge and perfection. He is very good at resolving user interface problems and interaction, and prides himself on his tenacity in solution building.
Portfolio
AIA Contracts
React, Next.js, TypeScript 5, Material UI, Zustand, Node.js, GraphQL...
ADVANCED PERSONAL COMPUTING, INC.
HTML, CSS, Tailwind CSS, Razor, App UI, UX Prototyping, UI Prototyping...
CloudCaptain, Inc.
CSS, HTML, Mobile Web, Tailwind CSS, JavaScript, TestFlight...
Experience
- UI Prototyping - 8 years
- UX Prototyping - 8 years
- React - 5 years
- Tailwind CSS - 5 years
- Technical Leadership - 5 years
- Node.js - 5 years
- Next.js - 4 years
- GraphQL - 3 years
Work Experience
Senior Full-stack Engineer
2025 - 2025
AIA Contracts
- Optimized GraphQL performance by implementing caching strategies for BigCommerce and Contentful APIs, reducing query response times and improving application load performance.
- Developed complex Stripe checkout flows supporting coupon codes, discounts, tiered subscription pricing, renewals, and automated payment processing for seamless transaction management.
- Integrated Amplitude analytics to track user behavior, conversion funnels, and product engagement metrics, enabling data-driven decision-making across the platform.
- Implemented Algolia search with advanced product indexing and filtering capabilities, enhancing search relevance and user experience for product discovery.
- Optimized SEO implementation through structured data, meta tags, and content optimization, improving search engine visibility.
- Built custom HubSpot form integrations with custom field mapping and validation.
- Implemented NextAuth authentication with secure session management and multi-provider support, ensuring robust user authentication and authorization across the application.
- Led and mentored development team members by planning sprint work, creating detailed task descriptions with acceptance criteria, and providing technical guidance to ensure high-quality deliverables.
- Authored comprehensive technical documentation covering source code architecture, module specifications, workflow processes, use cases, and test cases to facilitate knowledge transfer and maintainability.
- Implemented robust error handling and logging systems with centralized error tracking and security monitoring, improving application stability, debugging capabilities, and threat detection.
Technologies: React, Next.js, TypeScript 5, Material UI, Zustand, Node.js, GraphQL, Apollo Client, Apollo Server, Contentful, BigCommerce API, BigCommerce, Algolia, Stripe API, Stripe, NextAuth.js, JSON Web Tokens (JWT), Playwright, Azure, Amplitude, i18n, HubSpot, Apollo, Application State Management, Monorepos, Cursor AI, Documentation, UX Prototyping, Responsive UI, Technical Leadership, Next.js 14, B2B, API Design, CI/CD Pipelines, Code Review, Debugging, Software Architecture, Performance Optimization, UX Engineering, Product Engineering, Supabase, UI Components, Web Content Accessibility Guidelines (WCAG), Core Web Vitals, UI Development, Claude Code, Artificial Intelligence (AI), Headless CMS, AI Agents, Back-end Development, Scrum, AI Tools, Vibe Coding, Scalability, Reporting, Multi-agent Orchestration, Workflows, Accessibility, Front-end Architecture, Internalization, Design Systems, Vitest, HubSpot CRM, HubL, Multilingual Websites, Responsive Design, Dynamic Websites, Flexbox, Cross-browser Compatibility, Technical Writing, Developer Relations, Community, SEO Tools, Search Engine Optimization (SEO), eCommerce, A/B Testing, Analytics, Google Analytics 4 (GA4), Mixpanel, Software Development, Software Development Lifecycle (SDLC), Business Services
Senior UI/Front-end Engineer
2025 - 2025
ADVANCED PERSONAL COMPUTING, INC.
- Architected and implemented a comprehensive icon system, using a custom icon pack, with integrated size variants (Small, Medium, Large, and ExtraLarge), status styling (Success, Warning, Error, and Info), and dark mode support across all icon components.
- Implemented a Storybook-style component documentation system featuring live examples, interactive playgrounds, and comprehensive variant demonstrations.
- Developed a flexible components library with example implementations.
- Architected the prototype and structure for a new dashboard system, implementing a responsive design framework that adapts seamlessly to over a dozen distinct device formats.
- Spearheaded the creation of precise documentation and definitions for developer tools and AI-assisted workflows, enabling automated code completion and standardizing the feature implementation process.
Technologies: HTML, CSS, Tailwind CSS, Razor, App UI, UX Prototyping, UI Prototyping, Syncfusion, Docker Compose, Docker, Documentation, GitHub Actions, Speckit, CopilotKit, GitHub Copilot Chat, Application State Management, Cursor AI, Microsoft Copilot, Responsive UI, SaaS, Code Review, Debugging, Early-stage Startups, Performance Optimization, UX Engineering, CSS5, Supabase, UI Development, Artificial Intelligence (AI), AI Agents, AI Tools, Vibe Coding, Multi-agent Orchestration, Workflows, Accessibility, Front-end Architecture, Multilingual Websites, Responsive Design, Web Accessibility, Dynamic Websites, Flexbox, Cross-browser Compatibility, Technical Writing, Developer Relations, Search Engine Optimization (SEO), Software Development, Software Development Lifecycle (SDLC)
Mobile Web Front-end Developer
2025 - 2025
CloudCaptain, Inc.
- Recreated app screens in HTML, CSS, JavaScript, emphasizing pixel-perfect, responsive designs.
- Utilized Tailwind CSS for styling and maintaining the project's design consistency.
- Conducted end-to-end testing using the TestFlight app and build scripts.
- Refactored and optimized legacy application screens, extracting color variables and extending custom styling for selected device theme preferences.
Technologies: CSS, HTML, Mobile Web, Tailwind CSS, JavaScript, TestFlight, Static Site Development, Web, Web Development, Figma to HTML, Google, UX Design, Claude, Cursor AI, UX Prototyping, Responsive UI, Code Review, Debugging, UX Engineering, CSS5, UI Development, AI Agents, Vibe Coding, Workflows, Accessibility, Design Systems, Responsive Design, Cross-browser Compatibility, Software Development, Software Development Lifecycle (SDLC)
Senior Full-stack Engineer
2022 - 2024
Jollydays
- Designed and developed a CMS that enabled the manipulation and configuration of campaigns with data related to events of different types and content in various time intervals, at specific geographic locations, or virtually.
- Developed the client API using Node.js, which stored data in the Elastic database, and the user interface with React that simplified the creation of event campaigns.
- Used content relevant to the created campaign on the client-side website and filters for the user-provided terms, thus enabling fast and accurate results.
- Planned and tracked everything in Jira within daily calls and bi-weekly team planning and reviews.
Technologies: Next.js, Node.js, NestJS, Elastic, Kibana, Docker, Docker Compose, Figma, Elasticsearch, SCSS, Responsive Web Design (RWD), Single-page Applications (SPAs), TypeScript, Tailwind CSS, TypeScript 2, Web Standards, Agile Software Development, Responsive Web Apps, Content Management Systems (CMS), Quick Study, REST, Object-oriented Programming (OOP), React, Front-end, Google Geocoding API, Google Maps API, React Router, Redux, REST APIs, JSON REST APIs, Tailwind UI, Figma to React, CSS Animations, Storybook, i18next, APIs, Large-scale Projects, Manual Testing, User Experience (UX), Front-end Development, Full-stack Development, Architecture, Team Leadership, Pixel Perfect, Responsive, JSON, GitHub, Google Maps, Startups, Web, Back-end, Full-stack, Figma to HTML, Google, OpenAI API, Internationalization, UI Design, UX Design, i18n, Zustand, Technical Leadership, Application State Management, Monorepos, Documentation, UI Prototyping, UX Prototyping, Responsive UI, Amazon Web Services (AWS), B2B, SaaS, API Design, CI/CD Pipelines, Code Review, Debugging, Early-stage Startups, Software Architecture, Performance Optimization, UX Engineering, Product Engineering, CSS5, UI Components, Core Web Vitals, UI Development, Back-end Development, Scrum, NoSQL, AI Tools, Vibe Coding, Scalability, Reporting, Database Management, Workflows, Vercel, Accessibility, Front-end Architecture, Shadcn UI, Internalization, Design Systems, Multilingual Websites, Responsive Design, Web Accessibility, Dynamic Websites, Flexbox, Cross-browser Compatibility, Technical Writing, Developer Relations, Community, Search Engine Optimization (SEO), Analytics, Google Analytics 4 (GA4), Software Development, Software Development Lifecycle (SDLC), Business Services
Senior Full-stack Developer
2019 - 2022
Vertrical
- Developed many specific modules for querying and UI rendering using Elasticsearch, Node.js, Gatsby, React, HTML, and CSS.
- Tracked and fixed issues in Elasticsearch queries, including optimizations and boosting query response time.
- Planned teamwork, organized tasks and bug owners, tracked team progress and support, and debugged blockers.
Technologies: Node.js, SCSS, HTML, Gatsby, Next.js, Jest, Elastic, Responsive UI, User Interface (UI), JavaScript, TypeScript, Elasticsearch, Figma, Responsive Web Design (RWD), Single-page Applications (SPAs), Tailwind CSS, SQL, TypeScript 2, Web Standards, Agile Software Development, Responsive Web Apps, Content Management Systems (CMS), Responsive Layout, Quick Study, REST, Object-oriented Programming (OOP), Unit Testing, React, Front-end, Redux, React Router, Tailwind UI, Styled-components, Figma to React, Storybook, i18next, APIs, Large-scale Projects, Manual Testing, User Experience (UX), Front-end Development, Full-stack Development, Team Leadership, Pixel Perfect, Responsive, JSON, GitHub, Google Maps, PostgreSQL, NestJS, Startups, Web, Back-end, Web Development, Full-stack, Figma to HTML, Internationalization, UI Design, UX Design, i18n, GraphQL, Apollo, Application State Management, Monorepos, Documentation, GitHub Actions, Contentful, Stripe API, Material UI, UI Prototyping, UX Prototyping, Docker Compose, Technical Leadership, Express.js, Amazon Web Services (AWS), B2B, SaaS, API Design, CI/CD Pipelines, Code Review, Debugging, Early-stage Startups, Software Architecture, Performance Optimization, UX Engineering, Product Engineering, UI Components, Web Content Accessibility Guidelines (WCAG), Core Web Vitals, UI Development, MongoDB, Back-end Development, Scrum, NoSQL, Scalability, Reporting, Database Management, Workflows, Vercel, Front-end Architecture, Shadcn, Internalization, Design Systems, HIPAA, Healthcare, Multilingual Websites, Responsive Design, Web Accessibility, Dynamic Websites, Jakarta Server Pages (JSP), Flexbox, Cross-browser Compatibility, Technical Writing, Developer Relations, Community, Search Engine Optimization (SEO), Software Development, Software Development Lifecycle (SDLC), Business Services
JavaScript/Angular Developer
2015 - 2022
Online Freelance Agency
- Created a reusable data manager to manipulate response objects from any API configuration easily. Also supports deep binding directly on a model structure, so in return, it provides first-level data for fast-performance reading and writing.
- Developed a reusable parser to manage several viewable items for any platform and view type (list, grid, etc.) with a simple configuration file. It also supports auto-scrolling and auto-pulling of data from the API.
- Worked as a core team member and maintained agency talent and client platform, providing new features and maintaining reported problems and requests.
Technologies: CSS3, HTML5, AngularJS, Angular, JavaScript, Responsive UI, User Interface (UI), TypeScript, SCSS, Responsive Web Design (RWD), Tailwind CSS, Web Standards, Responsive Web Apps, Content Management Systems (CMS), Responsive Layout, Quick Study, REST, Object-oriented Programming (OOP), Dom Manipulation, Unit Testing, React, Front-end, Google Geocoding API, Google Maps API, Figma to React, CSS Animations, Storybook, i18next, APIs, Mobile Web, User Experience (UX), Front-end Development, Architecture, Pixel Perfect, Responsive, JSON, GitHub, Web, Web Development, Figma to HTML, Socket.IO, Debugging, Software Architecture, Performance Optimization, UX Engineering, Product Engineering, WebSockets, Scrum, Firebase, Reporting, Database Management, Front-end Architecture, Shadcn, Internalization, Multilingual Websites, Responsive Design, Web Accessibility, Dynamic Websites, Cross-browser Compatibility, Technical Writing, Developer Relations, Software Development, Software Development Lifecycle (SDLC), Business Services
JavaScript Engineer
2020 - 2020
Atmospheric Data Solutions, LLC
- Involved in developing specific features on the dashboard that drew any of the selected layers (e.g., winds, temperature., etc.) and provided animation with changes for the selected timeline (from a few minutes up to 24 hours).
- Collected and parsed all the incoming data and sorted it into a timeline to create frames that were later rendered and animated.
- Kept track of the renderers. As the platform was rapidly developed as a start-up, I had to give my best to fix existing memory leaks and build and deliver new features.
Technologies: jQuery, JavaScript, Bootstrap, Front-end, Web GIS, NetCDF, REST, Microservices, Chart.js, OpenLayers, Google Geocoding API, Google Maps API, CSS Animations, Manual Testing, Front-end Development, Pixel Perfect, JSON, GitHub, Leaflet, GIS, Google Maps, Web, Web Development, Debugging, Performance Optimization, UX Engineering, WebSockets, HTML Canvas, WebGL, UI Development, Reporting, Responsive Design, Cross-browser Compatibility, Developer Relations, Software Development
Developer and Team Lead
2017 - 2019
TNation
- Managed and organized the team and interviewed new candidates. Organized training sessions to improve coding.
- Wrote documentation and specifications for new features.
- Created reusable components that are and can be used across the system. Components determine what the content type is and display that content as a tooltip or modal window.
- Created migration files for seeding data and manipulating with column names and value types, using Sequelize.
- Refactored existing components covered with tests on both sides using Angular and Node.
- Built new UI components from the provided designs from internal company or client mocks created.
Technologies: MySQL, Node.js, Angular, Responsive UI, User Interface (UI), JavaScript, AngularJS, TypeScript, SCSS, Next.js, Figma, Responsive Web Design (RWD), Single-page Applications (SPAs), SQL, Less, TypeScript 2, Web Standards, Agile Software Development, Responsive Web Apps, Content Management Systems (CMS), Responsive Layout, Quick Study, REST, Object-oriented Programming (OOP), Unit Testing, React, Front-end, CSS Animations, Storybook, i18next, APIs, Large-scale Projects, Mobile Web, User Experience (UX), Front-end Development, Full-stack Development, Architecture, Team Leadership, Pixel Perfect, Responsive, JSON, GitHub, Leaflet, Google Maps, PostgreSQL, Stripe, Startups, Web, Back-end, Web Development, Full-stack, Figma to HTML, Internationalization, UI Design, UX Design, i18n, Technical Leadership, GraphQL, Jest, Apollo, Application State Management, Monorepos, Documentation, GitHub Actions, Contentful, Stripe API, Material UI, UI Prototyping, Docker Compose, Express.js, SaaS, API Design, Code Review, Debugging, Early-stage Startups, Software Architecture, Performance Optimization, UX Engineering, UI Components, Core Web Vitals, UI Development, MongoDB, Scrum, NoSQL, Scalability, Reporting, Database Management, Front-end Architecture, Internalization, Design Systems, Multilingual Websites, Responsive Design, Web Accessibility, Dynamic Websites, Jakarta Server Pages (JSP), Flexbox, Cross-browser Compatibility, Technical Writing, Developer Relations, Software Development, Software Development Lifecycle (SDLC), Business Services
Front-end Developer
2017 - 2017
BuildFire
- Developed custom-requested applications within the BuildFire SDK.
- Worked with a team of designers and developers on the best UX solution for the final product.
- Improved SDK testing tools, such as building a switch that enables different device screen size views in the testing phase. Also worked on SDK bug fixes.
Technologies: HTML5, CSS3, JavaScript, Zeplin, Web, Preact, GraphQL, Front-end, Google Geocoding API, Google Maps API, CSS Animations, Large-scale Projects, Manual Testing, Mobile Web, Front-end Development, Pixel Perfect, Responsive, JSON, GitHub, Leaflet, GIS, Google Maps, Web Development, UX Design, Application State Management, UI Prototyping, SaaS, Code Review, Debugging, Performance Optimization, UX Engineering, UI Development, Design Systems, Multilingual Websites, Responsive Design, Flexbox, Cross-browser Compatibility, Developer Relations, Software Development
Developer
2014 - 2015
Pure Blue Software. LLC.
- Built more than 70% of the components from scratch to make the application as light as possible due to the vast amount of active interactions and event handlers.
- Developed a specific grid system similar to the Google Calendar but with the same experience creating tasks and drag-n-drop positioning in strictly defined columns.
- Built the application was cross-browser compatible, and all the measures were dynamically calculated in case of screen size changes. This also involved repositioning the content and verifying that all tasks were visible to the client.
Technologies: Responsive Web Design (RWD), Graphic Design, Adobe Photoshop, Data Modeling, Vanilla JS, jQuery, jQuery UI, Dom Manipulation, Front-end, Google Geocoding API, Google Maps API, Front-end Development, Pixel Perfect, Web, Web Development, UX Engineering, Multilingual Websites, Responsive Design, Dynamic Websites, Cross-browser Compatibility, Software Development
UI/UX Developer
2014 - 2015
Pure Blue Software. LLC.
- Developed an application that tracks and organizes employees. Organizers can add and change each employee plan by interacting on the calendar. It's similar to Google Calendar.
- Developed a custom calendar component and custom drag-and-drop component for setting employee tasks, in order to get the best performance. The app had to handle overlapping and organization of UI when multiple tasks were on the calendar.
- Developed different user roles and views of the calendar and employee tasks.
Technologies: Responsive Web Design (RWD), Graphic Design, Adobe Photoshop, Data Modeling, JavaScript, jQuery, Responsive UI, User Interface (UI), Web Standards, Responsive Web Apps, Content Management Systems (CMS), Quick Study, Object-oriented Programming (OOP), Front-end, Front-end Development, Pixel Perfect, Web, Web Development, UX Engineering, Multilingual Websites, Responsive Design, Dynamic Websites, Cross-browser Compatibility
Web Developer
2014 - 2015
Tailor and Made
- Built websites with full cross-browsing compatibility from all desktop browsers on Windows, Linux, and Mac to all mobile and tablet platforms.
- Created a few quick-loading "single page" static websites which use different types of libraries and components that are optimized to work from IE8+.
- Developed custom CSS3 animations for websites, as part of my role.
Technologies: CSS3, HTML5, JavaScript, Responsive UI, AngularJS, Web Standards, Object-oriented Programming (OOP), Front-end, Front-end Development, Pixel Perfect, Static Site Development, Web, Web Development, UX Design, UX Engineering, Responsive Design, Cross-browser Compatibility
JavaScript/PHP Developer
2014 - 2015
Full Dream Solutions
- Created data communication between Unity3D (mobile, web) and different type of APIs like Shopify.
- Built a MySQL DB with RESTful APIs for a multiplayer game.
- Programmed a reusable JSON parser in C# that manages particular types of data as requested on one gaming product.
Technologies: MySQL, JavaScript, AngularJS, Web Standards, Quick Study, Object-oriented Programming (OOP), Front-end, Front-end Development, Pixel Perfect, Static Site Development, Startups, Web, Web Development, Multilingual Websites, Responsive Design, Dynamic Websites
Lead Front-end Engineer and Team Lead
2011 - 2014
Whitecitysoft
- Collaborated to create a custom JavaScript MVC framework that saves implementation time and spares developers the hassle of working with HTML structures by managing everything over a controller setup and hierarchy of controllers.
- Created hundreds of different widgets built from ten simple templates. All of them are specially made to be implemented modularly and give the developer an opportunity to create new widgets with a minimum of testing.
- Planned and researched UI on most projects to find the best optimal solution for all three sides, including designers, developers, and users, so building projects with a streamlined user interface will work more quickly in the future.
- Organized team members and managed code quality control.
- Took full responsibility for the system as a whole and performed training of new staff.
Technologies: XML, Git, CSS3, CSS, HTML5, HTML, JavaScript, Responsive UI, User Interface (UI), AngularJS, SQL, Web Standards, Agile Software Development, Responsive Web Apps, Content Management Systems (CMS), Responsive Layout, Quick Study, REST, Object-oriented Programming (OOP), Dom Manipulation, Unit Testing, Front-end, Google Geocoding API, Google Maps API, Mobile Web, User Experience (UX), Front-end Development, Team Leadership, Pixel Perfect, Responsive, Google Maps, Stripe, Static Site Development, Startups, Web, Back-end, Web Development, Internationalization, Documentation, Stripe API, UI Prototyping, UX Prototyping, Technical Leadership, Code Review, Debugging, UX Engineering, Scrum, Multilingual Websites, Responsive Design, Java, Dynamic Websites, Jakarta Server Pages (JSP), Cross-browser Compatibility, Technical Writing, Developer Relations, Software Development, Software Development Lifecycle (SDLC)
Web Developer
2010 - 2011
Freelance
- Developed a static website with a Flash introduction page.
- Implemented multi-language support with basic CMS using PHP scripts to provide easier editing of the website text content.
- Conducted SEO optimization. Implemented email subscribe for guests and newsletter.
Technologies: CSS, HTML, JavaScript, Figma, Object-oriented Programming (OOP), PHP, Adobe Flash, Front-end, Front-end Development, Static Site Development, Web, Web Development
Volunteer Java, JavaScript, and Delphi Programmer
2009 - 2009
Red Cross
- Created an MDI application in Java and Delphi for managing data.
- Built a generic application that is able to build independently and manage user interfaces based on database XML schematics.
- Supported offline (local) and online (server) data storage with auto-synchronization when the app connects to the internet.
Technologies: Microsoft SQL Server, Microsoft Access, RAD Studio, Delphi, SQL, Object-oriented Programming (OOP)
Project History
Online Directory
An AngularJS-based web application for an online directory of a wide range of businesses that anyone can review and check.
This application supports profile creation, reviews, and comments on different businesses. Users gain various levels of badges based on the experiences they share and are also allowed to upload photos and bookmark favorite businesses. Sharing is supported on all major applications. The application is compatible with all platforms, including mobile devices and old browsers.
This application supports profile creation, reviews, and comments on different businesses. Users gain various levels of badges based on the experiences they share and are also allowed to upload photos and bookmark favorite businesses. Sharing is supported on all major applications. The application is compatible with all platforms, including mobile devices and old browsers.
Earthquake Simulator
https://earlywarninglabs.com/An AngularJS-based web application for creating real-time simulations in the browser, with data from seismic sensors and drawing waves and effects on the map using ArcGIS API. It uses a Graham scan (algorithm) to calculate more realistic areas affected by an earthquake.
Regex Generator
An AngularJS-based web application, a generator for manipulating words and sentences to create funny letters from a serious business one. With the simple configuration file and list of words that will be replaced, the generator's built-in code is reusable and simple to modify. Also, the admin can modify the percentage of modifications the generator can make.
Interactive Organizer
Built in pure JavaScript to get the best performance, this website application manages the daily/weekly/monthly plans of each worker and client. It calculates available hours and pause offsets for each worker based on previous and next tasks that are already scheduled. Simple drag-and-drop brings each task to the calendar view, automatically applying new offsets for start and end time in the defined working hour scope.
Virtual Boards/Item Manager
A website application built on a customized Backbone library that allows users to create boards and use each of them for creating and gathering different types of items from the cloud, with Dropbox and Google Drive, from stores like Amazon, music services like Soundcloud, and user desktops. I was involved in the UI/UX development and integration. My responsibility was to implement the core architecture.
Website Video Channel
An online TV channel that provides custom videos for one particular sport. I worked on the dynamic elements of the application responsible for the video player, the relationships between galleries and players, and communication with the back end. The main gallery has different states of rolling "currently playing" video on the 1st position in the 1st row from the 2nd row.
Custom Management Tool for Air Company
A system for an aviation company that required three completely independent content management systems and two websites for customers and employees. I worked on one of the content management systems built for planning plane routes, registering routes with airports, calculating expenses, and finding the best and cheapest travel routes. My responsibility was to organize the front-end core architecture. I also developed major functionality and coordinated team efforts.
Website with Focus on Annual Reports In-Company
Three projects related to annual reports and promotion for two large global corporations. The goal was to cover a wide range of platforms, browsers, and media sizes with a static, single page that had to be fully resizable and quick-loading. Each project has about seven pages arranged in one line on the Body element, with the active one in focus and the others locked to the side like stacked pieces of paper.
Web Application for Selling Gifts and Vouchers
An application for gift sales. The company has a wide range of clients and customers, allowing clients to gain more sales for their products worldwide without pushing customers to go to stores. Everything is done via online payments and vouchers. My work was based on the content management system for this application, building a fully customized editor that allows clients to create their promotions and publish them independently of the central system.
Cinema Advertising Company
An application for a cinema advertising company that provides premium marketing and media solutions for advertisers and comprehensive representation of the cinema's advertising partners. I implemented the website application, allowing customers to register, review/rate movies, and take part in the weekly quizzes to get free tickets for the latest movies. Users can search for movies and check theater locations near a zip code.
Nialaya
An Android application for creating custom bracelets in 3D with ordering and payment mechanisms. I implemented a Shopify API and PHP RESTful service that provides all the data related to products and prices from the Shopify store server and communicates with another server where the 3D models and other application data are stored.
Cost Plus Drugs
I was a software engineer on this project. My responsibilities included developing new features, components, and optimizing existing ones. Besides React on the front end, I had to create, maintain, and support the development of new features on the back end with Node.js and GraphQL.
Search Engine Web Application
The project aims to provide a streamlined and efficient platform for users to search and access a specific adult type of content.
This single-page application (SPA) was crafted using JavaScript, the Angular framework, and essential web technologies such as HTML and CSS. My role extended beyond mere coding—I actively participated in enhancing UI/UX elements, ensuring a seamless and intuitive user experience.
This single-page application (SPA) was crafted using JavaScript, the Angular framework, and essential web technologies such as HTML and CSS. My role extended beyond mere coding—I actively participated in enhancing UI/UX elements, ensuring a seamless and intuitive user experience.
Document Imaging Application
Our client's company's purpose is to enhance the efficiency and effectiveness of document management within Microsoft SharePoint and Office 365 environments. Their innovative software solutions enable organizations to streamline document imaging, storage, and retrieval processes while ensuring regulatory compliance. By leveraging their products, businesses can maximize productivity by seamlessly integrating and optimizing their investments in SharePoint and Office 365 technologies across all facets of operations.
In my role, I played a crucial part in developing and optimizing a custom grid generator. This tool replicates the functionality of Microsoft Excel within a web browser, allowing users to view and print data in a formatted manner consistent with the original documents. Utilizing JavaScript, Bootstrap, CSS, HTML, and jQuery, I ensured that the grid generator provided a user-friendly experience while maintaining robust functionality and adherence to design specifications.
In my role, I played a crucial part in developing and optimizing a custom grid generator. This tool replicates the functionality of Microsoft Excel within a web browser, allowing users to view and print data in a formatted manner consistent with the original documents. Utilizing JavaScript, Bootstrap, CSS, HTML, and jQuery, I ensured that the grid generator provided a user-friendly experience while maintaining robust functionality and adherence to design specifications.
Education
2012 - 2016
Bachelor's Degree in Software Engineering
Metropolitan University - Belgrade, Serbia
Skills
Libraries/APIs
Node.js, jQuery, React, Google Geocoding API, Google Maps API, Google Maps, Flexbox, Preact, Chart.js, Leaflet, Stripe, Framer Motion, Socket.IO, Shopify API, Backbone.js, Python API, OpenLayers, jQuery UI, React Router, REST APIs, OpenAI API, Apollo Client, BigCommerce API, Stripe API, Playwright, WebGL
Tools
Git, GitHub, Figma to HTML, Claude, Figma, GIS, Microsoft Copilot, Claude Code, Shadcn, Vitest, Webpack, Elastic, Adobe Photoshop, Docker Compose, Kibana, Adobe Flash, Zeplin, Web GIS, TestFlight, Syncfusion, CopilotKit, Shadcn UI
Languages
TypeScript, GraphQL, TypeScript 2, JavaScript, CSS3, XML, HTML, CSS, HTML5, SQL, Sass, Less, HubL, SCSS, PHP, Regex, Python, TypeScript 5, Java
Frameworks
Angular, AngularJS, Next.js, JavaScriptCore, NestJS, Tailwind CSS, Bootstrap, i18next, Express.js, Next.js 14, Jest, Jakarta Server Pages (JSP), Vanilla JS, Redux, Razor, Material UI, JSON Web Tokens (JWT)
Paradigms
Responsive Layout, REST, Responsive Web Design (RWD), Object-oriented Programming (OOP), Manual Testing, Responsive, UX Design, B2B, Scrum, Search Engine Optimization (SEO), Agile Software Development, UI Design, Unit Testing, Microservices
Platforms
Visual Studio Code (VS Code), Web, HubSpot, Firebase, Vercel, Docker, Google Cloud Platform (GCP), WordPress, Contentful, BigCommerce, Algolia, Azure, Amazon Web Services (AWS), Mixpanel
Storage
Elasticsearch, JSON, NoSQL, Database Management, PostgreSQL, MongoDB, MySQL
Industry Expertise
Healthcare
Other
Responsive UI, Responsive Web Apps, User Interface (UI), Single-page Applications (SPAs), Content Management Systems (CMS), Web Standards, Quick Study, User Experience (UX), Software Engineering, Front-end, Figma to React, CSS Animations, Storybook, APIs, Mobile Web, Front-end Development, Full-stack Development, Architecture, Team Leadership, Pixel Perfect, Static Site Development, Startups, Back-end, Web Development, Full-stack, Internationalization, i18n, Technical Leadership, Apollo, Application State Management, Monorepos, Cursor AI, SaaS, API Design, CI/CD Pipelines, Code Review, Debugging, Early-stage Startups, Software Architecture, Performance Optimization, UX Engineering, Product Engineering, CSS5, UI Components, Web Content Accessibility Guidelines (WCAG), Core Web Vitals, UI Development, Headless CMS, Back-end Development, AI Tools, Vibe Coding, Scalability, Reporting, Workflows, Accessibility, Front-end Architecture, Internalization, Design Systems, HubSpot CRM, Multilingual Websites, Responsive Design, Web Accessibility, Dynamic Websites, Cross-browser Compatibility, Technical Writing, Developer Relations, Community, eCommerce, Analytics, Software Development, Software Development Lifecycle (SDLC), Business Services, Dom Manipulation, Large-scale Projects, Google, RTL, Zustand, Supabase, HTML Canvas, Lottie, Artificial Intelligence (AI), AI Agents, Multi-agent Orchestration, HIPAA, SEO Tools, A/B Testing, Google Analytics 4 (GA4), Gatsby, Graphic Design, Data Modeling, Regular Expressions, Web UX, XD to HTML, Wireframe to Product, ECM, NetCDF, JSON REST APIs, Tailwind UI, Styled-components, App UI, UX Prototyping, UI Prototyping, Documentation, GitHub Actions, Speckit, GitHub Copilot Chat, Apollo Server, NextAuth.js, Amplitude, WebSockets
Collaboration That Works
How to Work with Toptal
Toptal matches you directly with global industry experts from our network in hours—not weeks or months.
1
Share your needs
Discuss your requirements and refine your scope in a call with a Toptal domain expert.
2
Choose your talent
Get a short list of expertly matched talent within 24 hours to review, interview, and choose from.
3
Start your risk-free talent trial
Work with your chosen talent on a trial basis for up to two weeks. Pay only if you decide to hire them.
Top talent is in high demand.
Start hiring