Senior Android Developer

Finom; Germany (OH); On-site; USD 120,000 - 180,000; Full time

Job summary

Finom is seeking a Senior Android Engineer/Tech Lead to shape and own features in our Android application used by European business owners. You will work in a cross-functional team with Backend, Mobile, ML/AI, QA, Design, and Product to deliver end-to-end solutions.

You will drive architecture decisions, improve testing and performance, and mentor engineers while shipping high-impact fintech features like cash flows, card issuance, and AI-powered accounting support.

Qualifications

• 5+ years of Android development experience.
• Strong knowledge of Kotlin and modern Android app architecture.
• Experience with CI/CD and high code quality standards.

Responsibilities

• Design and build features in the Android app used by business owners across Europe.
• Own end-to-end development and architecture decisions for your domain.
• Mentor teammates and drive improvements in testing and performance.

Skills

Kotlin

Android

Jetpack Compose

RxJava

Dagger/Hilt

MVVM

CI/CD

GitLab

English

Fintech domain

Education

Bachelor's degree in Computer Science or related field

Tools

Retrofit

Firebase

Android Profiler

Perfetto

MVI

Job description

• We're looking for a Senior Android Engineer or Tech Lead who thinks like a product builder - someone who cares deeply about the "why" behind what they're building, not just the tickets in the backlog
• You'll be embedded in a cross-functional domain team (Backend, Mobile, ML/AI, QA, Design, and Product) and own the end-to-end development of features that genuinely matter: company accounts and cash flows, banking transactions, card issuance and management, and AI-enabled accounting
• You'll help shape architecture decisions, raise the bar on engineering quality, and mentor the engineers around you
• If you're energized by working at the intersection of great mobile engineering and real product impact - this is the role
• Design and build new features for our Android application, used daily by business owners across Europe
• Architect and implement reliable, intuitive solutions for:
• Multi-account cash flow management
• Banking transactions and payments
• Physical and virtual card issuance, activation, and control
• AI-powered accounting automation
• Build polished, responsive UIs using Jetpack Compose
• Take ownership of code quality, performance, and stability - automated testing and thorough code reviews are non-negotiable
• Collaborate closely with Backend, QA, Design, and Product - you'll be shaping solutions end-to-end, not just implementing specs
• Drive technical decisions within your domain, challenge assumptions when needed, and proactively identify opportunities to build better
• Contribute to CI/CD pipelines, tooling, and mobile best practices across the team

• You're pragmatic and have a proven track record of shipping products that matter
• You communicate clearly across disciplines and thrive in a cross-functional environment where everyone is solving the same customer problem together
• Navigation: Cicerone, Jetpack Navigation Component
• Experience with Feature-module architecture in production
• Reactive programming & async: RxJava, Kotlin Coroutines / Flow
• Practical experience with Firebase (FCM, Analytics, Crashlytics)
• Networking: Retrofit
• Clear, concise communication in English across technical and non-technical audiences
• Strong knowledge of Kotlin (Java knowledge is a plus) and 5+ years of commercial Android development
• Dependency injection: Dagger 2, Hilt, or Koin
• A builder's mentality - you care about the product, the users, and the outcomes, not just the code
• Confidence with Git / GitLab, including setting up and maintaining GitLab CI/CD
• Solid experience with presentation layer patterns - MVI, MVVM, and MVP - and the ability to choose the right one for the context
• Hands-on experience with our core stack:
• Modern UI: Jetpack Compose
• Deep understanding of OOP, SOLID, and Clean Architecture
• Background in fintech or experience with financial products - you understand the stakes
• Solid grasp of mobile security best practices (especially critical in our domain)
• Experience profiling and optimizing UI performance - reducing overdraw, improving recomposition efficiency in Jetpack Compose, and hitting smooth 60/120fps rendering
• Hands-on work with performance tooling: Android Profiler, Perfetto, Baseline Profiles, or similar
• Published apps on Google Play you're proud of
• An active GitHub profile with code you're happy to share
• Hands-on experience with AI agents and LLM tools (Claude, Cursor, Copilot, etc.) - setting up agent environments, writing prompts, skills, and behavioral rules
• Experience with AI-powered IDE tools (Cursor, Windsurf, GitHub Copilot, Claude Code, etc.) - including agent mode, rules files configuration, and integrating AI into the daily development workflow
• Understanding of model capabilities and limitations - knowing which model fits which task and how to manage the context window effectively
• Ability to evaluate and verify AI-generated output - using automated tests, linters, and critical review to catch hallucinations and errors
• Awareness of AI security risks - prompt injection, data leakage, and safe handling of untrusted inputs in agentic workflows