Senior Android Engineer

October 16, 2026

Hybrid

Senior

Warsaw, Poland

Also worth knowing

Mandatory office attendance
1 day per week
English is required
B2 level

Description

A fintech platform is being built from the ground up as a large-scale, international initiative, with a lean, AI-native engineering organization in Poland at its core. The engineer will shape the architecture, build core fintech components and take end-to-end ownership of the native Android platform — its architecture, quality, performance and delivery across a diverse device landscape. The role combines deep Android engineering expertise with a strong product mindset, covering business outcomes and user experience of consumer and merchant-facing solutions.

Responsibilities

Own the architecture of a production FinTech Android application, including layered architectural patterns, module boundaries, and the Gradle build structure
Develop and maintain native Android solutions using Kotlin, Jetpack Compose, and the View system
Implement reliable concurrency and state management using Kotlin Coroutines and Flow
Work with local persistence and security solutions such as Room, EncryptedSharedPreferences, and Android Keystore
Contribute throughout the development lifecycle, including PRD authorship, specification writing, testing, feature-flagged releases, and structured event emission
Build and maintain automated tests using JUnit, Espresso, and Compose Testing
Profile and improve application performance using Android Profiler and Perfetto, with a focus on CPU usage, memory, and UI performance
Maintain a zero-regression approach by monitoring crashes and ANRs through tools such as Crashlytics
Support CI/CD automation using Gradle, GitHub Actions, or equivalent solutions
Own integrations between native and web-based experiences, including WebView, Custom Tabs, App Links, and deep linking
Co-own the team backlog with Engineering and Product Managers, bringing Android constraints and native solution proposals into requirement shaping
Collaborate with backend engineers on API contracts, authentication flows, and event schemas
Participate in production incident support and post-mortem activities when required

Requirements

At least 5 years of experience in native Android engineering, including production applications published through Google Play
At least 4 years of experience working with Kotlin and Jetpack Compose and/or the Android View system
At least 3 years of experience with Android testing using JUnit, Espresso, and Compose Testing
Strong command of Kotlin, including Coroutines, Flow, sealed classes, and extension functions
Production-level experience with Jetpack Compose and the View system
Knowledge of Clean Architecture, MVVM, and/or MVI, with a strong understanding of module and layer boundaries
Experience with Hilt or Dagger 2, including component lifecycle and scope management
Experience with Room, EncryptedSharedPreferences, and Android Keystore
Knowledge of Retrofit and OkHttp, including certificate pinning and structured error handling
Experience with Android performance profiling using Android Profiler and Perfetto
Experience with Gradle-based CI/CD and automated signing and delivery processes
Ability to read and work with Java in legacy systems and third-party SDK integrations
Experience integrating feature flags and structured events at the mobile layer
English at a minimum B2 level
A university degree in Information Technology, Computer Science, or a related field
Nice to have: at least 2 years of experience in FinTech or regulated mobile application development
Nice to have: experience with Google Pay or Android payment APIs
Nice to have: experience with modular Android applications at a multi-module scale
Nice to have: knowledge of Instant Apps
Nice to have: experience implementing WCAG or Android accessibility standards in production applications
Nice to have: familiarity with KSP, KAPT, custom Gradle plugins, or Gradle convention plugins

Conditions

Hybrid working model with preferably one day per week in the Warsaw or Cracow office
Full-time employment with a B2B type of contract offered
Excellent working environment and flexible hours
Opportunity to work in a diverse, international and cross-functional environment with leading experts
Learning from a senior leader and their leadership team in the e-commerce and logistics industries
Training opportunities and a range of benefits invested in employee development
Part of a community making an impact on sustainability, convenient deliveries, and the circular economy