Armin is available for hire
Hire ArminArmin Vrević
Verified Expert in Engineering
JavaScript Developer
Zagreb, Croatia
Toptal member since February 18, 2014
Bio
Armin is a senior engineering manager and solution architect with 11 years of commercial software experience across a dozen business domains and global teams from 10 to 1,000+ people. He has led engineering groups of roughly 15, modernized live platforms for clients from $600,000 to $200 million in revenue, and ships governed AI workflows with evidence and guardrails. Clients hire him for architecture, production diagnosis, and delivery that stays technically credible.
Portfolio
Improve The News Foundation
Amazon Web Services (AWS), React, PHP, GitHub, Python, Bash, Jira, REST
Self-employed
Web Scraping, iOS, Trello, Lucidchart, Chatbots, PHP, CSS, HTML, Linux, Angular...
Via Trading
PHP, JavaScript, REST, APIs, MySQL
Experience
- JavaScript - 11 years
- SQL - 10 years
- GitHub - 10 years
- PHP - 10 years
- REST - 10 years
- Linux - 10 years
- Python - 8 years
- React - 8 years
Work Experience
Lead Engineer
2021 - PRESENT
Improve The News Foundation
- Refactored initial HTML-PHP and migrated it to React. Built several new features like user management and authentication module and an automated email solution for the newsletter.
- Developed automated migration processes and scripts, including a suite of automated Selenium tests for the performance and E2E tests.
- Coordinated release processes with other development members and configured their work environments.
- Created API specifications and documentation. Built several REST APIs. Worked with iOS and Android developers to support different features.
Technologies: Amazon Web Services (AWS), React, PHP, GitHub, Python, Bash, Jira, REST
Full-stack Developer
2020 - PRESENT
Self-employed
- Built a web scraper, website, and API from scratch in a 2-month timeframe that crawls several million retail products daily, allowing the client to develop their new eCommerce business, clearancespot.com.
- Built two diet iOS apps, including the back end for user and subscription, chatbot reporting for the ad, costs, and funnel optimization, allowing the client to position themselves in a new niche to sell their products.
- Mentored a person who wanted to switch careers and become a software engineer within six to nine months and move from South Korea to the US.
- Developed custom integrations with Facebook Marketing API, TikTok, and Snapchat to track the customer traffic for better-performing ads. Added integrations with the analytics API to provide real-time analytics and automated campaign optimizations.
- Built several eCommerce websites with PayPal, credit card processing, and fulfillment integration.
- Created several chatbots for user activity and purchase reporting.
Technologies: Web Scraping, iOS, Trello, Lucidchart, Chatbots, PHP, CSS, HTML, Linux, Angular, Android, Swift, PostgreSQL, REST, HTML5, CSS3, Git, Docker, jQuery, Bootstrap, Object-oriented Programming (OOP), MySQL, MongoDB, Ajax, UML, Node.js, JavaScript, Python, Scraping
Senior Web Developer and Consultant
2021 - 2022
Via Trading
- Helped the team optimize the performance of their solution to prevent crashes and increase the system's stability. Organized and introduced different software development practices that are up to today's standards.
- Created a scalability plan for the system, identified and resolved various infrastructure issues, and fixed a large portion of problematic MySQL queries and PHP scripts.
- Created a high-performance online auction bidding system based on sockets.
- Designed a custom search algorithm for better product matching that uses a heavily adapted Levenshtein algorithm.
Technologies: PHP, JavaScript, REST, APIs, MySQL
Senior Software Engineer
2018 - 2020
mStart
- Spearheaded the six-month development of new retail software in a team of 30 people for one of the largest retailers in the Adriatic region, which allowed them to be the first in the world to adopt a new generation of Oracle software.
- Developed a custom solution in a timeframe of three months that allows a retailer to customize the price change on any product subcategory in any store it owns, therefore increasing the retailer's revenue by several million USD.
- Maintained and performance-optimized several of their legacy solutions, allowing their business to continue operating normally.
Technologies: Angular, PL/SQL, Oracle ADF, Java, REST, HTML5, CSS3, Docker, jQuery, Object-oriented Programming (OOP), Ajax, Windows, UML, Subversion (SVN), HTML, CSS, JavaScript
Back-end Developer
2017 - 2018
GIS Cloud
- Developed a Google Drive-like file management system for a GIS solution that has more than 100000 users in a timeframe of 9 months.
- Used RabbitMQ in coordination with PHP to support async long-running REST calls.
- Worked on the GIS platform REST APIs using many different technologies.
Technologies: RabbitMQ, Git, Linux, PostgreSQL, PHP, REST, HTML5, Bootstrap, Object-oriented Programming (OOP), Windows, UML, HTML, CSS, JavaScript
Oracle Developer
2015 - 2017
Kogitas
- Executed and developed more than seven tests and one go-live data migration for a leading student accommodation provider in the UK with more than 50,000 students.
- Developed several in-house solutions for automated several internal processes that saved hundreds of man-hours if those tasks were performed manually.
- Implemented a custom automated HTML notification engine that allows thousands of customized emails to be sent to customers each day.
Technologies: PHP, Java, Oracle Mobile Application Framework (Oracle MAF), C#, Oracle EBS, PL/SQL, Oracle SQL, HTML5, jQuery, Object-oriented Programming (OOP), Ajax, Windows, UML, Subversion (SVN), HTML, CSS, JavaScript
iOS Developer
2014 - 2015
Colombio
- Developed a crowdsourced iOS application for a kickstarted company.
Technologies: Objective-C, REST
ASP.NET Developer Intern
2013 - 2014
Info Novitas
- Worked on CRM product development.
Technologies: JavaScript, CSS, HTML, Jira, Model View Controller (MVC), C#, HTML5
Teaching Fellow
2012 - 2014
Faculty of Organization and Informatics
- Taught students a variety of programming examples demonstrating C++ from basic to advanced programming techniques.
- Introduced object-oriented programming and its concepts.
- Solved and implemented examples from the data structures and algorithms field, including sorting algorithms, queues, tree data structures, stack, and linked lists.
- Solved and implemented operating system functions with C++ in Linux, including manipulating threads, processes, error messages, pipelining, message queues, and paging algorithms.
- Solved various examples, including manipulating data basics from indexed data files, binary files, and text files.
- Taught students simple examples when working with assembler simulator EASy68K.
Technologies: C++
Project History
Tree and Queue C++ Algorithm Implementations
A simple program that needs a basic C++ compiler and works on the Windows operating system only. It demonstrates data structure algorithms, including queue and walking the tree. The code is from 2011 and shows the implementation of binary trees and queues using C++.
Hackathon Winner at Faculty of Organization and Informatics
This was 24 hours of coding. I was part of the winning team of four members. The challenge was to build a web application for blood donating institutes and a mobile application for donors. Later, this was expanded to the healthcare institutions that accepted the idea and agreed to continue with the project.
Clearance Spot
An eCommerce solution that has its base data fetched with the help of Web crawlers from five different retailers. It has more than 300,000 products crawled daily with a search and API engine built using Solr.
I also built a native iOS application that mimics the website.
I also built a native iOS application that mimics the website.
Improve the News
A news aggregator website with AI and ML classifying the news from different media to improve your access to trustworthy news.
Acted as a lead engineer at this company, working on various fronts, from creating front-end React components, to building back-end APIs using PHP, creating documentation using Postman, building deployment pipelines, managing releases, and building automated E2E testing scripts
Acted as a lead engineer at this company, working on various fronts, from creating front-end React components, to building back-end APIs using PHP, creating documentation using Postman, building deployment pipelines, managing releases, and building automated E2E testing scripts
Interlingual Subtitle Voicing App
A web app built for the University of Surrey to support speech-to-text translation. This app is a research project that uses Google's speech-to-text API to aid with translating various TV shows and movies. Its premise is to improve the efficiency and quality of the current translator software that Netflix and other media companies use.
Education
2010 - 2015
Master's Degree in Information and Software Engineering
Faculty of Organization and Informatics - Varaždin
Certifications
JULY 2017 - PRESENT
Oracle Java Professional – 1Z0-809
Oracle
JULY 2016 - PRESENT
Oracle Java Associate 1Z0-808
Oracle
MARCH 2015 - PRESENT
Oracle SQL Expert 1Z0-047
Oracle
Skills
Libraries/APIs
Node.js, React, OpenAPI, jQuery, Socket.IO
Tools
Git, RabbitMQ, GitHub, NGINX, Trello, Jira, Lucidchart, Subversion (SVN), Apache Solr
Languages
HTML, SQL, PHP, CSS, Swift, Java, JavaScript, CSS3, HTML5, Python, TypeScript, Objective-C, UML, C++, C#, Bash
Paradigms
REST, Model View Controller (MVC), Object-oriented Programming (OOP)
Platforms
Visual Studio Code (VS Code), Linux, Docker, Amazon Web Services (AWS), MacOS, Windows, Android, iOS
Storage
PL/SQL, Oracle SQL, PostgreSQL, MySQL, Redis, MongoDB
Frameworks
Angular, Next.js, Selenium, Laravel, Oracle Mobile Application Framework (Oracle MAF), Oracle ADF, Bootstrap
Other
Scraping, Solution Architecture, Web Scraping, FastAPI, Vite, Cloudflare, GitHub Actions, Engineering Management, Prompt Engineering, Oracle EBS, Chatbots, Ajax, APIs, Cursor AI
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