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BJAK

Android Software Engineer – Finance Super App

BJAK

Android Engineer for BJAK's finance super app focused on building Kotlin mobile features and improving user journeys. Work in a hybrid role based in Tokyo with a dynamic global team.

Posted 7/5/2026full-timeTokyo • 🇯🇵 JapanMid-LevelSeniorWebsite

Tech Stack

Tools & technologies
AndroidKotlin

About the role

Key responsibilities & impact
  • Build and ship Android features using Kotlin.
  • Create clean mobile flows for insurance, payments, claims, renewals and financial services.
  • Work with product and design to simplify complex user journeys.
  • Integrate backend APIs and ensure mobile flows are stable, secure and reliable.
  • Improve app performance, crash rate, loading states, responsiveness and memory usage.
  • Use analytics, user behaviour and production issues to improve the product.
  • Build AI-assisted mobile experiences only where they genuinely improve the user journey.

Requirements

What you’ll need
  • 3+ years of Android development experience using Kotlin.
  • Strong Android fundamentals and experience shipping production apps.
  • Good knowledge of Jetpack, Coroutines, Flow and modern Android architecture.
  • Strong sense of mobile UX, usability, edge cases and user flows.
  • Experience integrating REST APIs and debugging production issues.
  • Fast execution, high ownership and strong attention to product quality.
  • App links, GitHub, screenshots or examples of shipped work are a strong advantage.

Benefits

Comp & perks
  • Hybrid role with at least 3 days per week in the Tokyo office
  • Strong English communication is required
  • Opportunity to build next-generation financial products,
  • Work with diverse teams from different nationalities

ATS Keywords

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Hard Skills & Tools
Android DevelopmentKotlin ProgrammingREST API IntegrationJetpackCoroutinesFlowMobile UXDebuggingPerformance OptimizationUser Flows
Soft Skills
Fast ExecutionHigh OwnershipAttention to Product Quality