Senior Product Engineer - Android/Kotlin

Qonto; Barcelona; On-site; EUR 60,000 - 90,000; Full time

Benefits offered by this job

AI tooling access

Engineering standards

Fintech domain experience

Job summary

Qonto in Barcelona is seeking an Android Engineer to own features end-to-end in a modular Kotlin codebase. You will collaborate with Product, Design, Backend, and Frontend to ship high-quality mobile experiences.

You will drive technical decisions, improve reliability, and mentor peers within a large mobile engineering community in a fintech context.

Join us to craft AI-enabled, scalable Android apps that power 600,000+ European businesses.

Qualifications

• Strong Android native experience with Kotlin and production features.
• Quality-driven mindset with emphasis on tests and clean code.
• Ability to solve problems in ambiguity and iterate quickly.
• Experience using AI coding tools in daily workflow.
• Collaborative by nature, fluent in English, and able to mentor peers.

Responsibilities

• Own features end-to-end from discovery to rollout and iteration.
• Drive technical decisions with Product, Design, and Backend.
• Raise app reliability, performance, and test strategy for scale.
• Tackle mobile challenges like real-time sync and modular design.
• Grow Android craft through code reviews and mentoring.

Skills

Android native

Kotlin

Code reviews

AI tooling

Mentorship

Job description

Our mission and customers

We are creating the freedom for SMEs to succeed by delivering Europe's leading finance workspace with banking at its core, augmented by financial tools. We are proud to be rated 4.8 on Trustpilot, based on 55,000+ reviews. Our culture puts customer satisfaction at the core of what we do, as proven by our Net Promoter Score of 75 (more about our culture here).

Our journey

Founded in 2017 by Alexandre and Steve, Qonto has grown to 1,700 Qontoers serving over 750,000 customers across 8 European countries. We have been profitable since 2023, and we are just getting started.

Our beliefs

We hire for skills and potential. With 80+ nationalities, 45% women, of which 56% of women in our leadership team, diversity isn't a program; It's who we are. We’ve built a discrimination-free hiring process because the best teams are built on merit.

AI at Qonto

AI is deeply embedded in how we work (here) – Every Qontoer gets unlimited access to the best AI tools. We want people who experiment without waiting for permission, push AI beyond the obvious, know when to trust it, and when to question it.

Location

You can choose to work at Qonto as long as you're living in (or willing to relocate to) either Germany, France, Italy, Serbia, Portugal, or Spain.

Mission

Join us as an Android Engineer and help us build the mobile experience that 600,000+ European businesses rely on every day to manage their finances. You'll own product-critical features end-to-end — from technical design to rollout — in a large, modular Kotlin codebase where craft and velocity both matter. You'll work closely with Product, Design, Backend, and Frontend.

What you'll do

• Own features end-to-end: You'll take ownership from discovery and technical design through implementation, rollout, and iteration on features that help businesses pay, get paid, and stay in control.
• Drive technical decisions in your squad: You'll shape solutions with Product, Design, and Backend by clarifying tradeoffs across UX, performance, security, and time-to-market.
• Raise app reliability and maintainability: You'll improve architecture, performance, and test strategy to scale the app without compromising stability.
• Tackle complex mobile challenges: You'll contribute to real-time synchronization, resilience patterns, and smooth navigation in a modular codebase with ~1,000 modules.
• Grow the team's Android craft: You'll lead code reviews and technical discussions, share patterns, and mentor peers to raise the bar on quality and delivery.

What we're looking for

• Strong Android native experience: You've shipped and maintained production features with Kotlin and are comfortable owning technical decisions end-to-end.
• Quality-driven mindset: You care about testing (unit, UI, snapshot), clean code, and pragmatic standards that keep teams moving fast.
• Problem-solving approach: You thrive in ambiguity and turn complex constraints into simple, robust solutions.
• AI-native workflow: You use AI coding tools daily to amplify your output — not just experiment with them.
• Collaborative by nature: You're fluent in English and contribute through code reviews, knowledge sharing, and mentorship across technical and non‑technical stakeholders.

What we can offer you

• An AI‑first engineering environment: Unlimited access to Claude Code, Cursor, and Copilot — and a culture that expects you to use them to raise the bar, not just go faster
• Engineering standards that scale: Strong code review culture, continuous refactoring, and a focus on correctness in a regulated context.
• A technically demanding domain: Fintech constraints — security, compliance, real‑time data — push you to solve problems most mobile engineers never encounter.

Our methodology, the Qonto Way

• We value upfront technical design, team reviews, and smart slicing — quality drives the velocity our customers need.
• Our org assigns one team lead per project across stacks, giving your team a clear mission and full autonomy on how it operates.
• Our lean toolbox, Kaizen and PDCA, lets you monitor and drive continuous improvement collaboratively with your peers and manager.

Our stack & practices

• Kotlin-first & modern concurrency: 100% Kotlin codebase with Coroutines + Flow throughout.
• Architecture: MVVM + Clean Architecture with modular design (~1000 modules).
• UI direction: New screens built with Jetpack Compose, with a large share of legacy views already migrated.
• CI/CD & quality: GitHub Actions, Bitrise, Firebase Test Lab, Sonar, Fastlane.
• Testing culture: 26k+ unit tests, 14k+ snapshot tests, 500+ UI tests.

Curious about how we tackle tech debt? Check out our talk from the last Droidcon here featuring Florian.

Your future team

As an Android Engineer, you will join one of Qonto's squad teams, each organised around a clear project mission, with one team lead and full ownership of a product scope. You'll be part of a 140+ mobile engineering community within a 500+ Product Engineering department, working in focused teams of 5 to 10 people alongside Product, Design, and peers from Frontend and Backend.

At Qonto, we understand that true diversity isn’t just about ticking boxes on a hiring checklist. Apply regardless of the boxes you tick — who knows? You may have the missing piece of the puzzle we’ve been searching for all along.

By applying, you agree that Qonto processes your personal data to assess your application. Your data is kept for up to 2 years in our candidate pool. Read our Privacy Notice for full details.

On average, our hiring process lasts 20 working days.

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