04/21/2026 updated

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100 % available

Senior Android/Kotlin/Java Developer

Diemen, Netherlands
Worldwide
Bachelor Computer Science
Diemen, Netherlands
Worldwide
Bachelor Computer Science

Profile attachments

CV Jim Clermonts ENG 21-4-2026.pdf

About me

Freelance Android Java/Kotlin Developer with 10+ years of expertise in enterprise software engineering and 4 years of managing software teams.

Clean ArchitectureJava (Programming Language)Android (Software)PostgreSQLSpring BootKotlinDocker
Android Development
Expertise in enterprise Android apps with 10+ years of experience, specializing in consumer-facing high-traffic applications and mobile streaming video technologies

Kotlin/Java Programming
Advanced proficiency in Kotlin and Java development with focus on clean architecture, MVVM patterns, and modern Android frameworks

Software Architecture
Deep knowledge in designing scalable software architectures, implementing clean code principles, and managing complex technical roadmaps

Team Leadership
Experience in recruiting, coaching and managing software development teams, providing architectural guidance and mentoring junior developers

Backend Development
Proficiency in Java Spring Boot, API development, database integration and server-side architecture design

Product Management
Skills in product lifecycle management, stakeholder collaboration, user story creation and agile development methodologies

Mobile Technologies
Expertise in coroutines, multi-threading, Room database, Postgres, Docker and modern Android SDK components

Testing & Quality Assurance
Implementation of pyramid testing strategies, automated test frameworks and continuous integration practices

Experience

Professional experience10+ years
Freelancer since2014

Languages

EnglishFluentDutchNative speaker

Project history

Lead gen platform - Freelance Java/Kotlin developer

Wisefrog
Developed automated hyper-personalized lead generation platform with Java Spring boot back-end, PDF audit generation, and Kotlin implementation with clean architecture

Freelance Android developer / Product owner

Nationale Postcode Loterij
Developed Vriendenloteij App using Kotlin Multiplatform and Jetpack Compose, scaled from MVP to 600k users, managed product owner responsibilities

Startup founder / CTO

DailyChef
Founded food-only social network, created B2B proposals for supermarket delivery companies, managed team structure and investor relations

Senior Android developer

CM.com
Developed payment solutions for merchants, implemented Kotlin clean architecture, introduced Proguard security measures and Material design

Startup founder / CTO

DailyChef
Developed cooking app combining passions for cooking and engineering, implemented marketing solutions and UX improvements using Sketch

Senior Android developer

Airchip
Developed festival payment app with wallet functionality, improved architecture and implemented mixpanel analytics with Room database integration

Senior Android developer

Knab banking app
Continued development on banking app using Kotlin, improved MVVM architecture, implemented pension savings and KYC verification processes

Android developer

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

Android developer

Interpolis consumer app
Built project from scratch with freelance team, implemented MVVM design pattern, bank-grade security features and Kotlin Android Extensions

Android developer

Oxxio consumer app
Developed breakdown functionality within strict timeframe, implemented RxJava for API calls and Repository design pattern

Android developer

Bijenkorf consumer app
Assisted with app development until regular employee was found, implemented filter refinement features and provided technical design consultation

Android developer

NU.nl consumer app
Created native banner implementation using Mocean SDK, added video overlay functionality with SBS KijkPlayer SDK and 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
Automated test cases for communication systems, worked on RESTful API testing, applied Object Oriented principles and Design patterns

C++ Developer

Bosch (via Altran) / SW Platform
Developed embedded software for combustion management platform, responsible for Jenkins build server setup and Test Driven Development

Android developer

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

Java / Objective-C developer

Ejenta / InteractionService
Developed platform for telemetry processing from wearable sensors, created iPhone app for data collection, worked with SQL and HTML front-end

C Programmer / Hardware designer

Altran / Graduation project
Developed home automation platform with Ethernet, USB, SD Card interface and RFID, created web interface and implemented various web services

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