Skip to content

Matúš Choma

Personal info

NameMatúš Choma
AddressKošice, Slovakia
Age33

Education

2006-2010State Gymnasium Trebišov
Focused on: Informatics
2010-2014Technical University of Košice
Faculty of Electrical Engineering and Informatics
Focused on: Informatics – bachelor’s degree
2014-2016Technical University of Košice
Faculty of Electrical Engineering and Informatics
Focused on: Informatics – master’s degree

Programming language skills

BestKotlin, Java (Android), TypeScript (React Native)
StrongPHP, JS, HTML, CSS, MySQL
BasicPython, Swift, C, C#

Frameworks and libraries

AndroidKotlin Coroutines, Kotlin Flow, Jetpack/JetBrains Compose, OkHttp3, Retrofit2, RxJava2, Dagger2, MVP, MVI, MVVM, Kotlin Multiplatform, Firebase, Google Pay,
Orm Lite with SQLCipher, ProGuard/DexGuard, Espresso testing, JUnit, Mockito, LeakCanary, Biometric, AndroidX
BackendSpring Boot + Kotlin (hobby projects + local mock)
Reverse engineeringTOR + sqlmap, Kali linux
Android reverse engineering APK Studio, jadx, Recaf, apk-tool
PHPNette with Latte
OtherGIT, Mercurial, SVN, Unity3D, Parse

Language skills

Slovaknative
Englishactive
Germanpassive

Summary

Mobile application developer with passion for working with latest technology, paying attention to details. Loving the clean code, thinking about the best possible solution for the problem. I have 13+ years experience with Java and 12+ years with Android development creating over 20 apps.

Hobbies:

  • Cooking, Coffee enthusiast
  • Traveling
  • Reading articles related to programming stuff (e.g. medium, reddit,…)

Ethical hacking:

Time ago I had some strong feelings that some of the applications where I register are not really that secure. From that point I have decided to check what is hiding under the hood, possibly change that so that application can omit some parts of execution. I have been fascinated that you can change something from point that you don’t really own some source code, but I’m able to alter it’s behaviour. Many times it was about bypassing root detection and showcasing how application’s licensing model works. I have been reporting some of the vulnerabilities, last time also about Slovak COVID-19 quarantine app to our Prime Minister, sadly, he did not respond. All of that is done only as a hobby and I do not affect developers / owner of source code and their intellectual property.

Career

Summary

  • Working on whitelabel solution, app modularisation / core refactoring, new features
  • Kotlin, Coroutines, Jetpack Compose, XML, Jenkins CI/CD

Summary

  • Working on whitelabel solution, app modularisation / core refactoring, new features
  • Kotlin, Coroutines, Jetpack Compose, XML, RxJava, Groovy, Jenkins CI/CD

Summary

  • Working on whitelabel solution for Billa, PENNY Market
  • Kotlin, Coroutines, Jetpack Compose, focus on modularity, screenshot testing, GitLab CI/CD

Summary

  • Payment SDK, due diligence of a mobile apps
  • Kotlin, Coroutines, Jetpack Compose, XML, RxJava, Bitrise CI/CD

2020 – 03/2022: Nordlicht IT solutions

Summary

  • Developing chat, crypto apps from scratch, architectural parts of applications, recommendations on UX parts of applications with UI/UX designers / product owners, presenting applications for clients
  • 5 ppl
  • Kotlin, Coroutines, Jetpack Compose, WebSockets

2018-2020: Contractor for Wirecard SK – Senior Android Developer / Architect

Summary

  • Developing apps mainly from scratch, architectural parts of applications, recommendations on UX parts of applications with UI/UX designers / product owners, presenting applications for clients
  • Various team sizes when working on different projects from 3 ppl to ~25 ppl
  • Working with teams from e.g. Germany, Belarus, Greece
  • App performance measurements from API calls – caching optimisations to profiling applications via Android profiler, detecting memory leaks via LeakCanary
  • Mobile payment division – projects focused to mobile contactless payments using Google Pay, HCE and applications for maintaining personal bank accounts.
  • Scrum methodology, mercurial (before)/ git (currently gitlab)
  • well tested code – JUnit testing with Mockito, instrumentation tests with Barista, testing of internal app states (MVI)
  • debugging issues on obfuscated released apps – decompiling / smali bytecode

Mobile applications I have been working on:

  • boon.PLANET – mobile payment solution with Google Pay
  • Payout – react native application for account managing
  • Payout US – react native account management application for North America

Boon Planet and Boon Payment

Snímka obrazovky
  • 15 members team on Planet
  • 25 members team on framework
  • From ground up managed project
  • App architecture with configurable and re-skinnable approach
  • Dev team of 5+ members
  • Project reviewer
  • One framework for multiple branded apps
  • App is frontend bank management system with 100+ screens
  • Big focus on security, JUnit testing, state testing, espresso success flow testing
  • Business logic based custom validation system
  • Tight coupled with Firebase and multiple analytics tools
  • Payments through Google Pay

Technologies: RxJava 2, Retrofit 2, Dagger 2, MVI, Kotlin, Glide, AndroidX, Kotpref

Role: One of lead Android developers

Description: App for mobile payment with Google Pay

Responsibilities: Implementation of new features / libraries development

https://play.google.com/store/apps/details?id=de.wirecard.boonplanet

https://play.google.com/store/apps/details?id=de.wirecard.boonpayment

Payout

  • 8 members team
  • App for mobile banking
  • Transformation of network calls -> wrapper with RX support
  • Securing app
  • Error handling

Technologies: TypeScript, React Native 0.61, Redux, TSLint, React Navigation, Axios, REST

Role: Lead React Native / Android developer

Description: App for mobile banking, transactions, card management

Responsibilities: App architecture / implementation of new features

Payout (US)

  • 4 members team
  • Lead React Native developer
  • App for mobile banking, targeted to North America
  • Application architecture
  • Securing app

Technologies: TypeScript, React Native 0.54, Redux, TSLint, React Navigation, Axios, SOAP

Role: Lead React Native / Android developer

Description: App for Wirecard US branch- mobile banking

Responsibilities: App architecture / implementation of new features

2015-2018: Wirecard GmbH – Android developer

Boon

  • 10 members team
  • App for mobile payment with HCE

Technologies: Mercurial, RxJava 1, Retrofit 1, Dagger1, Orm Lite with SQL Cipher, EventBus, GCM, Retrolambda

Role: One of lead Android developers

Description: App for mobile payment with HCE

Responsibilities:

  • Code simplification and refactoring for more robust solution
  • Transformation of network all calls to RX wrapper solution
  • Wrapper for HCE library -> event bus
  • Securing app with encrypted DB and shared preferences
  • Error handling
  • Additional functionality implementation

mycard2go

  • 10 members team
  • Architect and lead developer
  • MVP approach
  • Whole app RX based
  • Google Maps

Technologies: RxJava 1/2, Retrofit 2, Dagger 2, Mosby MVP, Orm Lite with SQL Cipher,  EventBus, Timber, M+ permissions Dexter, Retrolambda, Stream API, Dexguard

Role: Lead Android developer

Description: App for mobile banking – account maintenance and e-commerce payment

Responsibilities:

  • MVP approach
  • Whole app RxJava based, Stream API back-port
  • Google Maps

Libraries development

Technologies: RxJava 2, GSON, Retrofit 2, OkHTTP 3, Orm Lite with SQL Cipher, EventBus,Timber, Retrolambda, Stream API, DexGuard, AutoValue

Role: Architect and lead developer

Description: libraries for the Wirecard applications (loyalty system, version check, etc.)

Feb 2014 – Oct 2014: Inlogic Software

Audi Servis

  • 3 members team
  • Work with files
  • API REST calls
  • Google Maps

Technologies: SVN, Retrofit 1, OrmLite, Google play services, Picasso

Role: Architect and lead developer

Description: Mobile app for local Audi service

Responsibilities:

  • Whole solution

BWF Shuttle Time

  • 2 members team
  • Work with files
  • API REST calls
  • Google Maps

Technologies: SVN, CocoaPods, AFNetworking, JSONModel, Foundation.framework, MediaPlayer.framework

Role: iOS developer

Description: Application for bwf badminton association with instructional videos

Responsibilities:

  • Whole solution

Nov 2010 – Oct 2014 – ASP.NET/Android Developer @ INTELSOFT EAST, spol. s r.o.

  • Team size – 2ppl
  • responsible for applying the designs into ASP.net application and module development
  • Android application prototypes for internal use only

Feb 2013 – Feb 2014 – IT Support / PHP DEVELOPER @ U-Shin Slovakia s. r. o.

  • Team size – 3ppl
  • working with google docs scripts in the beginning
  • responsible for the architecture and PHP lead developer

applications I have been working on:

  • application for the warehouse
  • application for the paint shop

~2006 – PRESENT – Web development, UX, Android, ios @ Home

  • Team size ~ 2ppl
  • started with HTML + CSS + Photoshop
  • PHP / python scripts
  • few iOS applications written in Objective-C, basics of Swift 3
  • Android utilities and prototypes for personal use
  • Cine-Box – application for cinemas, IMDB movies parser
  • Unity3D games – Zidan / Jumping Dude

Cine-Box

  • 2 members team – me + roommate (Lukas Dobransky)

Technologies: SVN, Retrofit 1, OrmLite, Google play services, Picasso

Role: Android developer + UX/UI

Description: Application for Cinemax movie theaters – current movies in theaters, ordering a ticket, watching movie trailers

Responsibilities:

  • Movie detail
  • parsing movies / ticket ordering from theater’s site
  • UI design

IMDB movie parser

Technologies: RxJava 2, Retrofit 2, Dagger 2, Mosby MVP, Orm Lite with SQL Cipher,  EventBus, Timber, Retrolambda, Stream API

Role: Android developer

Description: Application for watching movies / tv shows (trailers) / tv channels

Responsibilities:

  • Preparing models, core development

Zidan

Techlologies: Unity3d

Role: C# developer, preparation of map, UI design

Description: Small viral game made during few evenings

Responsibilities:

  • Preparing models, core development

SpyApp

Technologies: EventBus, Timber, Retrolambda, Stream API, Retrofit 2

Role: C# developer, preparation of map, UI design

Description: Lightweight app made for test purposes only, services are hooked to boot of android phone, every SMS, MMS, Call, Photos, Screenshots is send to defined email address

Responsibilities:

  • core development