Senior Android Developer

Join the Senior team behind the Billease Android app — a Kotlin & Jetpack Compose fintech product that millions rely on for payments, credit, and secure account access. You'll own features end-to-end, raise the engineering bar alongside other senior developers, and help keep a fintech-grade codebase fast, secure, and a pleasure to work in.

What you'll do

• Own features end-to-end — from the networking and data layers through to pixel-accurate Jetpack Compose UI, verified in production.
• Help uphold and evolve the architecture: a clean, layered flow (data → domain → presentation), clear module boundaries, and reactive single-source-of-truth state.
• Raise the bar through rigorous code review, shared standards, and mentoring — contributing to a strong senior team, not working in isolation.
• Keep the app crash-resilient, performant, and secure — careful recomposition, disciplined null-safety, and sensitive data encrypted at rest.
• Investigate and drive production issues to root cause, then ship the fix and the regression guard.
• Help shape conventions, module design, and technical direction together with the team as the product scales.

What we're looking for

• 7+ years of professional Android development, including meaningful time in a Senior or lead role owning architecture and technical decisions — not just closing tickets.
• Expert-level Kotlin — structured concurrency with coroutines, Flow / StateFlow, strict null-safety, and a feel for clean, stable public API design.
• Deep production Jetpack Compose: state hoisting, recomposition and performance tuning, custom layouts, and type-safe Compose Navigation at scale.
• Command of MVVM / clean architecture and DI (Hilt/Dagger) — able to shape and uphold layering and patterns across a large codebase, not just follow them.
• Fluent in a multi-module Gradle codebase and a disciplined Git / MR-based workflow with thorough reviews.
• Solid REST networking (Ktor/Retrofit) and JSON serialization, local persistence (Room), and a proven security-first instinct for auth, sessions, and data at rest.
• Fluent working from Figma — reading designs, specs, and a design-token system, and turning them into faithful, reusable Compose components in close partnership with designers.
• Effective, judgment-driven use of AI coding tools (e.g. Claude Code, Copilot) — using them to move faster while critically reviewing and validating everything they produce to a senior's standard.

The way you show up

• Actively drive technical and feature discussions — asking sharp questions, weighing trade-offs, and helping the team land on the right approach.
• Lead the charge when it counts: investigate and triage production issues, trace root causes, and drive them to resolution.
• Take ownership end-to-end — you plan before you build, flag risks early, and see work through to verified-in-production.
• Collaborate well in a cross-functional, fast-moving team and are comfortable with ambiguity.

Nice to have

• Fintech or payments experience at scale — with a security-first mindset.
• Hands-on with data-at-rest encryption (Keystore / Tink), auth/session handling, biometrics, or KYC / liveness flows.
• Feature-flagged delivery, analytics instrumentation, and crash monitoring.
• Static analysis and quality gates (detekt / ktlint) and E2E UI testing.
• Experience migrating legacy XML/Fragment screens to Compose, and contributing to a shared design system.

What you'll work with

Language & UI

• Kotlin
• Jetpack Compose
• Compose Navigation
• Coroutines + Flow
• Figma / Design tokens

Architecture & data

• MVVM / Clean
• Hilt
• Ktor
• kotlinx.serialization
• Room
• Multi-module Gradle

Quality & security

• JUnit + MockK
• detekt
• Keystore / encryption
• Feature flags
• AI-assisted dev