Senior Android Developer

Finom; España; On-site; EUR 65,000 - 85,000; Full time

Job summary

Finom is seeking a Senior Android Engineer or Tech Lead to craft features for our Android app used by business owners across Europe. You’ll own end-to-end development in a cross-functional team with Backend, Mobile, ML/AI, QA, Design, and Product.

You’ll design and build new features, mentor engineers, contribute to architecture and CI/CD, and ensure performance and test coverage with Jetpack Compose-driven UI, Dagger/Hilt, and robust testing. Experience in fintech context is a plus.

Qualifications

• 5+ years of commercial Android development.
• Experience with Jetpack Compose and modern Kotlin.

Responsibilities

• Design and build features for the Android app used by business owners across Europe.
• Own end-to-end development, including architecture decisions and code quality.
• Mentor engineers and participate in reviews.
• Collaborate with Backend, QA, Design, and Product to shape solutions.
• Contribute to CI/CD pipelines and mobile best practices.
• Drive performance optimizations and testing coverage.

Skills

Android development

Cross-functional collaboration

Product-driven mindset

Problem solving

English communication

Tools

Jetpack Compose

Retrofit

Firebase

Dagger 2/Hilt/Koin

Android Profiler

Perfetto

Baseline Profiles

Jetpack Navigation Component

Cicerone

Git/GitLab CI/CD

AI tooling integration

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
• Architect and implement reliable, intuitive solutions for banking transactions and payments
• Architect and implement reliable, intuitive solutions for physical and virtual card issuance, activation, and control
• Architect and implement reliable, intuitive solutions for 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 — 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 matterYou communicate clear across disciplines and thrive in a cross-functional environment where everyone is solving the same customer problem togetherExperience with Cicerone or Jetpack Navigation ComponentExperience with Jetpack ComposeExperience with feature-module architecture in productionHands-on experience with performance tooling such as Android Profiler, Perfetto, or Baseline ProfilesPublished apps on Google Play that you’re proud ofUnderstanding of model capabilities and limitations, including choosing models for tasks and managing context windowsA solid grasp of mobile security best practicesExperience with dependency injection using Dagger 2, Hilt, or KoinClear, concise communication in English across technical and non-technical audiencesHands-on experience with AI agents and LLM tools, including setting up agent environments and writing prompts, skills, and behavioral rulesDeep understanding of OOP, SOLID, and Clean ArchitectureHands-on experience with reactive programming and async using RxJava and Kotlin Coroutines / FlowConfidence with Git / GitLab, including setting up and maintaining GitLab CI/CDAbility to evaluate and verify AI-generated output using automated tests, linters, and critical reviewPractical experience with Firebase, including FCM, Analytics, and CrashlyticsStrong knowledge of Kotlin; Java knowledge is a plusA builder’s mentality — you care about the product, the users, and the outcomes, not just the codeExperience with AI-powered IDE tools, including agent mode, rules-file configuration, and integrating AI into the daily development workflowAwareness of AI security risks, including prompt injection, data leakage, and safe handling of untrusted inputs in agentic workflowsSolid experience with presentation layer patterns — MVI, MVVM, and MVP — and the ability to choose the right one for the contextAn active GitHub profile with code you’re happy to shareBackground in fintech or experience with financial productsExperience with Retrofit for networking5+ years of commercial Android developmentExperience profiling and optimizing UI performance, including reducing overdraw, improving recomposition efficiency in Jetpack Compose, and achieving smooth 60/120fps rendering