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HIRE KOTLIN DEVELOPER
Senior Kotlin engineer shipping production Android apps and cross-platform modules with KMP. Available for native Android delivery, shared business logic, and backend Kotlin — remote, worldwide.
Last updated: May 2026
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Production Android delivery
Shipped production Android apps using Kotlin, Jetpack Compose, and modern architecture components. Deep expertise in coroutines, Flow, Room, and Hilt for building maintainable Android codebases.
Kotlin Multiplatform
Shared business logic between Android and iOS using Kotlin Multiplatform and Compose Multiplatform. Reduce duplication while keeping platform-specific UIs native and performant.
Remote-native collaboration
Structured daily standups, async updates via Slack/Linear, and weekly video check-ins when needed. Based in Japan, collaborating with teams across APAC, EU, and US.
Full-stack mobile capability
Beyond Android — KMP shared modules, Next.js web companions, Firebase/Supabase backends, RevenueCat subscriptions, and ASO/SEO growth strategy. One partner for your entire product.
What you get
- Fractional Android lead — architecture, code review, and sprint planning
- Native Android (Kotlin) with MVVM, Redux/MVI, Dagger/Hilt, and multi-module structure
- Cross-platform delivery with Flutter or Kotlin Multiplatform
- Production diagnostics — crash/ANR analysis, memory profiling, and device-specific fixes
- CI/CD setup (Bitrise, GitHub Actions) and release pipeline automation
How it works
Discovery
Stakeholder interviews to align on product vision, followed by a deep codebase audit covering architecture, test coverage, and build times. I then recommend platform selection — native Android, Flutter, or Kotlin Multiplatform — based on your timeline, existing team shape, performance requirements, and long-term maintenance capacity.
Architecture
Design of modular project structure, dependency injection strategy using Dagger or Hilt, state management patterns such as MVVM or MVI, and API contract design with strong typing. All major decisions are documented in an Architecture Decision Record to preserve context for future team members.
Development
Sprint-based delivery with structured PR templates, mandatory code review, and weekly demo sessions. Native modules are used for platform-specific capabilities like camera or Bluetooth, while shared UI and business logic layers eliminate duplication across iOS and Android.
QA & Release
Comprehensive automated testing including unit tests, integration tests, and screenshot testing to prevent visual regressions. CI/CD pipelines on Bitrise or GitHub Actions manage staging builds, staged rollouts, and automated crash monitoring integration for production confidence.
Growth
Post-launch ASO metadata optimization, store asset preparation including screenshots and preview videos, analytics instrumentation with Firebase or Amplitude, and a dedicated support window to stabilize crash rates and user retention metrics.
Recent delivery
Deckbase
Learn with decks, FSRS spaced repetition, rich templates, and AI-assisted card creation.
Case study →
LoA
Mindful app usage: pause before distracting apps with intention, gratitude, and affirmations.
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Engagement
Fractional Lead
2–3 days per week embedded with your team. Ideal for ongoing roadmap delivery, architecture decisions, and mentoring while you scale.
Project-Based Delivery
Fixed-scope sprints (4–8 weeks) with clear milestones. Best for MVPs, feature launches, and greenfield builds.
Advisory Retainer
Architecture review, code audits, and technical strategy on a monthly basis. Perfect for teams that need senior oversight without full-time commitment.
Trust
8+
Years experience
4+
Apps shipped
24h
Response time
1 week
Paid trial
Trusted at
Testimonials
Yosuke's Kotlin Multiplatform setup let us share 70% of code between Android and iOS. It saved us months of development time.
— CTO, Social Platform
The Kotlin coroutines architecture he implemented made our app feel instant. Users noticed the performance improvement immediately.
— Product Manager, Travel App