04/10/2026 updated

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100 % available

Senior Android Developer / Freelance Product Owner

Diemen, Netherlands
Germany
Bachelor Computer Science
Diemen, Netherlands
Germany
Bachelor Computer Science

Profile attachments

CV Jim Clermonts ENG 7-4-2026.pdf

About me

Freelance Android Developer with 10+ years of expertise in enterprise software engineering and 4 years of managing software teams. In recent years worked primarily on consumer-facing high-traffic Android and iOS apps in the banking and fundraising industry.

Java (Programming Language)Android (Software)Android StudioIOS SDKObjective-C (Programming Language)Software ArchitectureRxjavaDesign PatternsTest-Driven Development (TDD)Google FirebaseGitKotlinJetpack ComposeProgramming Languages
Android Development
Android SDK, Android Studio, Kotlin, Java with 10+ years of expertise in enterprise Android apps and mobile streaming video technologies

Software Architecture
MVVM, MVI, Clean architecture, Repository pattern, Coroutines, multi-threading, Unit and Integration testing

Product Management
Product Lifecycle Management, User Story Translation, Stakeholder Collaboration, Backlog Management, Effective Communication

Programming Languages
Kotlin, Java, Swift, C++, Python, Objective-C with extensive experience in mobile and embedded development

Development Tools
Git, Jira, iOS SDK, XCode, Jenkins, Firebase, Dagger2, RxJava, Retrofit

Database Technologies
Room database, SQL, data sources, low level drivers with focus on mobile data management

Testing Frameworks
Test Driven Development, Cpputest framework, Pytest, automated testing, continuous integration

Design Patterns
Factory, Singleton, Observer, Decorator patterns, Object Oriented principles, UML design

Experience

Professional experience10+ years
Freelancer since2015

Languages

EnglishFluentDutchNative speaker

Project history

Freelance Android developer

Het Dagelijks woord
Yearly maintenance of bible app with 50,000 daily active users, database migration from Ormlite to Room, implementing clean architecture and Firebase push messages

Freelance Android developer / Product owner

Nationale Postcode Loterij
Developed Vriendenloterij App using Kotlin Multiplatform and Jetpack Compose, scaling from MVP to 600k users, leading technical discussions and product owner tasks

Startup founder / CTO

DailyChef
Founded food-only social network, created B2B proposal for supermarket delivery companies, interviewed over 100 marketers and business leaders

Senior Android developer

CM.com
Developed payment solutions for merchants, implemented Bluetooth Low Energy, QR code generation, introduced Kotlin and clean architecture

Startup founder / CTO

DailyChef
Developed cooking app combining passions for cooking and engineering, created MVP and launched in Play Store

Senior Android developer

Airchip
Developed festival payment app, improved architecture, introduced mixpanel for analytics, coached junior developers

Senior Android developer

Knab banking app
Continued development on banking app using Kotlin, improved MVVM architecture, implemented pension savings and KYC process with RFID scanning

Android developer

Beterdichtbij consumer app
Implemented new authentication method, introduced Kotlin and MVVM ViewModel, added video calling and file sharing features

Android developer

Interpolis consumer app
Built project from scratch with freelance team, implemented MVVM design pattern, bank-grade security, and RecyclerView architecture

Android developer

Oxxio consumer app
Developed breakdown functionality within 6 weeks, implemented RxJava for API calls with RetroFit2, used Repository design pattern

Android developer

Bijenkorf consumer app
Assisted with app development, implemented filter refinement feature, advised on architecture and design using RxJava

Android developer

NU.nl consumer app
Created native banner implementation using Mocean SDK, added video overlay using SBS KijkPlayer SDK, implemented Factory design pattern

Android developer

Mijn Nuon consumer app
First full-time freelance assignment, redesigned software architecture, introduced design patterns like Model View Controller and Factory

Python test Engineer

Bosch (via Altran) / Dicentis Wireless
Worked on CCS1000D communication systems, automated test cases using pytest framework, introduced Behaviour Driven Development

C++ Developer

Bosch (via Altran) / SW Platform
Developed embedded software for combustion management platform, worked with Jenkins build server and Python scripts

Android developer

YouKnowWatt (via Altran)
Developed Android app for smart energy meter, implemented Services, Intents and Fragment Activities using Test Driven approach

Java / Objective-C

Ejenta / InteractionService
Developed platform for telemetry processing from wearable sensors, used Java Play! 2 framework, Maven, AWS, developed iPhone app

C Programmer / Hardware designer

Altran / Graduation project
Developed platform for home automation, created requirements specification and software/hardware design with Ethernet, USB, SD Card interface

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