Tamás is available for hire

Tamás Sengel

Verified Expert in Engineering

iOS Developer

Location

Budapest, Hungary

Toptal Member Since

March 29, 2018

Tamás is an experienced iOS developer who has worked on applications since 2013. He has developed software for four Apple-based operating systems (macOS, iOS, tvOS, watchOS) and worked on many different apps, from social network projects to an information app for a world championship event.

iOS Simulator iOS iOS Native Libraries UIKit Cocoa Touch Swift Swift 4 Social Networking Crashlytics MacOS Model View Controller (MVC)CocoaPods Trello iOS SDK App Store SpriteKit

Portfolio

Sciometrics LLC

iOS, Swift, Objective-C, Objective-C++, Xcode

Passio Inc.

iOS, Swift, CocoaPods, Xcode

Gavin Kwon

iOS, Swift, Xcode, CocoaPods

Experience

Mobile Apps - 10 years iOS - 10 years Xcode - 8 years Swift - 7 years CocoaPods - 4 years WatchOS - 3 years SwiftUI - 2 years React - 1 year

Availability

Part-time

Preferred Environment

Swift, Git, CocoaPods, Xcode, MacOS

The most amazing...

...app I've created is the iOS client of a Q&A social network where users can ask each other questions, but anyone can answer them.

Work Experience

iOS Freelance Developer

2021 - 2023

Sciometrics LLC

Developed Slapshot. Utilized biometric capture and matching, mainly for intelligence and law enforcement agencies. Designed for ease of use, allowing every officer, soldier, and agent to be a biometric sensor.
Developed a sample app that demonstrates the functionality of Slapshot using SDK. Enabled users to manage and record identities.
Kept in contact with clients and provided technical help.

Technologies: iOS, Swift, Objective-C, Objective-C++, Xcode

iOS Freelance Developer

2021 - 2021

Passio Inc.

Developed parts of Jazeera Paints, an AR-based paint testing and defect analyzer app for a Saudi Arabian painting company.
Created a color selection UI element that divides paint colors into categories.
Tracked and fixed bugs using an online reporting tool.

Technologies: iOS, Swift, CocoaPods, Xcode

iOS Freelance Developer

2020 - 2021

Gavin Kwon

Developed parts of a meditation-focused iOS app called Roadtripr, which helps users relax in different human-curated categories. Users can toggle other effects to fine-tune the experience.
Contributed to developing a video editing app called Dramatique that lets users add custom, specially curated sound effects to videos. Used the AVFoundation framework to play sounds.
Kept in touch with the founder to manage bugs and improvements.

Technologies: iOS, Swift, Xcode, CocoaPods

iOS Freelance Developer

2019 - 2021

ExxonMobil - XTO Energy

Developed the iOS app, Safe2Work, which provides field personnel various tools to perform their daily responsibilities, including filling out and submitting forms. It's also capable of displaying documents, handling notifications, and much more.
Tracked and fixed bugs using the Azure DevOps platform.
Managed app releases using the Microsoft App Center platform.

Technologies: Agile Software Development, Xcode, iOS, Swift

CTO/Founder

2016 - 2020

Q&A Social Network Company

Developed the iOS version of Q&A Social Network using Swift, Xcode, and CocoaPods. Facilitated members of the network to be able to ask questions from each other and anyone can answer them, even anonymously.
Designed the UI/UX for the iOS/Android application. Created various vector-based assets using Sketch and structured the user flow.
Monitored and controlled the Android and back-end development of the application.

Technologies: CSS, JavaScript, HTML, CocoaPods, Adobe Photoshop, Xcode, Swift, App Store

iOS Freelance Developer

2018 - 2019

Tastebuds Media Ltd

Helped develop the iOS app Tastebuds, a dating app for music lovers.
Kept in touch with the founders and tracked bugs using GitHub.
Managed app releases via TestFlight so the employees could test each new version.

Technologies: Swift, iOS, iOS SDK, iOS Native Libraries

iOS Freelance Developer

2018 - 2018

Thrash Technologies

Developed the base of an iOS app called Sentral, a music aggregation service.
Kept in touch with the founder regarding issues and improvements.
Provided technical help to the founder to make testing easier.

Technologies: Swift, iOS, Mobile App Development, Music Streaming, APIs

iOS Freelance Developer

2018 - 2018

Plexis Tech

Developed the initial version of the Plexis iOS app. Plexis is a social network centered around finding, planning, and sharing events. It helps users find exciting things to do near them.
Managed beta app version releases through TestFlight.
Kept in touch with the back-end developer to help integrate the API into the app.

Technologies: Back-end, iOS, Swift, Event Calendars

iOS Developer

2016 - 2018

Infoto-Soft Kft.

Created the iOS client of a business club named BusinessFlow using Swift, Xcode, and CocoaPods. The app lets users manage their schedules and get in contact with other club members.
Developed the iOS application of Našakarta, a Slovakian tourist card using Swift, Xcode, and CocoaPods. Users can buy a virtual card and get discounts for deals from numerous providers.
Worked on the supporting application and SDK of an IoT device for iPhone and iPad using Swift, Objective-C, and Xcode. The device functioned as an external storage, keyboard, and mouse, making it unique at the time.
Built an iOS framework that integrates a chat interface in third-party apps using Swift, Xcode, and CocoaPods. The framework includes group chat support, media sharing, and a customizable interface.
Developed the iOS version of Celebrum, an online skill-based puzzle game using Swift, Xcode, and CocoaPods. Users can play against real opponents and exchange in-game currency for real prizes.

Technologies: Objective-C, Swift, iOS, Xcode, CocoaPods, UIKit

Experience

Safe2Work | iOS App

Client: ExxonMobil and XTO Energy

I developed the iOS app, Safe2Work, that provides field personnel with various tools to perform their daily responsibilities, including filling out, passing, and submitting forms. It's also capable of displaying documents and resources, handling notifications, and much more.

The technology stack I used: Swift, Xcode, CocoaPods.

Bloom - iOS and Android App

Designed and developed Bloom, a native iOS and Android application. The app allows users to create, share, and display dynamic animations that alter when the device's battery level changes.

The technology stack I used: Objective-C, Java, Xcode, Eclipse.

World Championships - iOS App

Developed the iOS application for a world championships event with a built-in schedule, medals, events, news, and much more. The app was ranked number one in the App Store in Hungary, where the event was held.

The technology stack I used: Swift, Xcode, CocoaPods.

Slapshot – iOS SDK and App

https://sciometrics.com/slapshot.html

Developed "Slapshot," an iOS SDK and sample app I created for biometric capture and matching by intelligence and law enforcement agencies. It is designed for ease of use, allowing every officer, soldier, and agent to be a biometric sensor.

Fluff Money | React Website and Staking Dapp

https://fluff.money/

Designed and developed the website and staking dapp of Fluff Money, my crypto project. Users can stake and unstake their FLUF tokens using the dapp. The staking has a unique variable fee system, which can be tracked via the website.

TECHNOLOGY STACK
React, Solidity

Tastebuds - iOS App

https://tastebuds.fm

Developed the iOS dating app application that connects people with similar musical tastes. Users can set their profiles up so it reflects their unique taste in music.

The technology stack I used: Swift, Objective-C, Xcode, CocoaPods.

Plexis | iOS App

https://plexis.app

Developed the initial version of the Plexis iOS app. Plexis is a social network centered around finding, planning, and sharing events. It helps users find exciting things to do near them.

The technology stack I used: Swift, Xcode, CocoaPods.

QnA Social Network - iOS App

I partially designed and developed the iOS app for a Q&A-based social network where users can ask questions, and anyone can answer those questions. Members of the network can also chat with each other, even anonymously.

The technology stack I used: Swift, Xcode, CocoaPods, Adobe Photoshop, Adobe Illustrator, Sketch

CommaSurf – WatchOS App

https://qudia.io/commasurf

Developed CommaSurf, a web browser for watchOS. It has features such as a unified URL/search bar, a changeable search engine, and searchable history.

The technology stack used: Swift(UI), Xcode, CocoaPods.

WatchFunk – WatchOS App

https://qudia.io/watchfunk

Designed and developed WatchFunk, a piano/musical keyboard app for watchOS. Users can choose between nine instruments, including trumpet, guitar, and drums.

The technology stack I used: Swift (UI), Xcode, CocoaPods, and Sketch.

Jazeera Paints | iOS App

https://apps.apple.com/us/app/jazeera-paints/id551919303

I worked with a startup called Passio and partially developed Jazeera Paints, an AR-based paint testing and defect analyzer app for a Saudi Arabian painting company.

The technology stack used: Swift(UI), Xcode, CocoaPods.

WatchToy – WatchOS App

https://qudia.io/watchtoy

Designed and developed WatchToy, a virtual fidget toy for the Apple Watch. Users can interact with various fidget tools, and the app gives appropriate haptic feedback.

The technology stack I used: Swift (UI), Xcode, CocoaPods, Sketch.

WatchSlime – WatchOS App

https://qudia.io/watchslime

Designed and developed WatchSlime, a slime simulator app. Users can play with 3D interactive slimes in various colors. I used iOS SceneKit to display the slime.

The technology stack I used: Swift (UI), Xcode, CocoaPods, Sketch.

Dramatique | iOS App

https://apps.apple.com/us/app/dramatique/id1625830551

I partially developed a video editing app called Dramatique that lets users add custom, specially curated sound effects to videos. I used the AVFoundation framework to play sounds.

The technology stack used: Swift, Xcode, CocoaPods.

Našakarta | iOS App

https://inflexstudio.com/projects/nasakarta

I developed the initial version of the iOS client for Našakarta, a service for travelers and locals who want to enjoy personalized discounts and special deals in the Košice region. It uses a special, secure QR code as a virtual card. Both providers and regular users can use the same app interface, as it also works as a code scanner.

The technology stack used: Swift, Xcode, CocoaPods.

Roadtripr | iOS App

https://apps.apple.com/app/id1532134179

I partially developed a meditation-focused iOS app called Roadtripr, which helps users relax in different human-curated categories. Users can toggle other effects for fine-tuning the experience.

The technology stack used: Swift, Xcode, CocoaPods.

Business Flow | iOS App

https://apps.apple.com/us/app/business-flow/id1278386502

I partially developed the iOS application for Business Flow, a business club for CEOs. Users can keep up with their schedules and make new connections through a recommendation system built around the concept of making successful deals.

The technology stack used: Swift, Xcode, CocoaPods.

Sentral | iOS App

I partially developed the iOS app of a music aggregation service that lets users access their Apple Music, Spotify, and SoundCloud accounts from one application.

The technology stack used: Swift, Xcode, CocoaPods.

4 Brands 1 Word | iOS App

I designed and developed 4 Brands 1 Word, a fun puzzle game that combines logo quizzes and four picture apps. Users should guess what connects the four brands in each level and earn coins to get hints.

The technology stack I used: Swift, Xcode, CocoaPods, Sketch.

Skills

Languages

Swift, Swift 5, Swift 4, Python, SQL, CSS, JavaScript, HTML, C#, Objective-C, Solidity

Frameworks

Cocoa Touch, Core Foundation, UIKit, iOS SDK, SwiftUI, StoreKit, Unity, React Native, Core Data, Core Location

Libraries/APIs

iOS Native Libraries, CocoaPods, Alamofire, Facebook iOS SDK, Social APIs, SpriteKit, Core Animation, Spotify API, Core Graphics, React

Tools

iOS Simulator, XML Interface Builder (XIB), Final Cut Pro X, Crashlytics, Adobe Photoshop, Trello, Sketch, Visual Studio App Center, Azure DevOps Services, Xcode, SourceTree, iOS Instruments, Git, Atom, Jira, Auto Layout, Adobe Illustrator

Paradigms

Mobile Development, Model View Controller (MVC), B2B, B2C, Agile, Agile Software Development

Platforms

iOS, WatchOS, MacOS, Azure, tvOS, Firebase, Music Streaming

Other

Mobile Architecture, Mobile Apps, Mobile App Development, App Store, OCR, Business Services, QR Codes, App Store Acceptance Process, Location Tracking, AVFoundation, Carthage, Objective-C++, Back-end, Event Calendars, APIs

Industry Expertise

Social Networking

Storage

JSON, SQLite, Firebase Realtime Database

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