Mobile Engineer

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Mobile Engineer

role at

Bitstack

About Bitstack It all started with an idea in 2021. Initially built to democratize Bitcoin in France, Bitstack has gone from a simple product that invests spare change in bitcoin, to a crypto‑native bank bringing a better way to save, spend, and grow money to our 300K+ users. We want to rebuild finance from the ground up to empower people to achieve financial freedom by participating in a more open and inclusive financial system. We’re a small, ambitious team of operators. We believe in moving fast, sweating the details, and creating products people truly love. At Bitstack, you’ll have the opportunity to shape not just our products, but the culture and practices of our entire organization. Bitstack is backed by YC, leading VCs like 13books Capital, Stillmark, Serena, and many more. We are building a product our users love and we are just getting started!

The Role Bitstack’s engineering team is responsible for building the technology platform that powers our mission. We care about infrastructure that makes it easy to write software that is secure, efficient, and tested. We build incrementally and we deploy every day.

What You’ll Be Doing

Collaborate with a growing Engineering and Product team

Drive new initiatives with a willingness to challenge the status quo to push the product forward

Build a well‑tested and performant app that communicates with Bitstack’s other infrastructure

Breathe life into industry‑leading User Interfaces

Ship high quality, scalable, reliable products in a production environment

Unit test everything

Work in a highly compliant environment and contribute to the larger Bitcoin ecosystem

Contribute to the broader tech and open source communities

Tech stack

Backend: Go, Python

Frontend: Flutter, Dart, TypeScript, JavaScript

Databases: SQL (basic DBMS knowledge helpful)

What We’re Looking For

You’ve got experience scoping, designing, delivering and supporting projects from end to end

Worked on shipping multi‑platform applications with Flutter or other mobile frameworks with complex state management and with an emphasis on security

Understand software development lifecycles and mobile application lifecycles

Understand integration testing frameworks for Flutter or React Native

Understand accessibility on mobile devices

Have a deep understanding of Git workflows and automation

Spectacular analytical reasoning and problem‑solving skills

Strong communication and problem‑solving skills

Ability to self‑manage and take ownership of projects

Fluent English (French is a bonus)

Interview Process

Introductory Call (45 min) – An initial conversation with our CTO to get to know you better and share more details about the role, the team, and how we work at Bitstack

System Design (60 min) – A discussion focused on how you approach problem‑solving, communicate your ideas, and prioritize decisions. This helps us assess your technical depth and ability to design scalable systems

Take Home Task & Task Review Call (60 min) – You’ll receive a practical task to complete in your own time. Once submitted, we’ll schedule a review call to walk through your solution together and explore your thought process in more detail

Behavioural Interview (60 min) – A conversation centered on your experiences, decision‑making, and collaboration style. We’ll discuss real‑world scenarios to understand how you navigate technical challenges, teamwork, and stakeholder interactions

Perks & Benefits

Work from our office in Paris (Bourse) or Remote

Flexible working hours

⚕️ One of the best health insurance plans with 100% employer contributions

Monthly team activities and bi‑annual offsites

Swile meal vouchers

Competitive salary based on experience & Bitstack stock options

Diversity & Inclusion We hire talented and passionate people from all kinds of backgrounds, we don’t care about your age or where you studied. If you’re excited about the role but your past experience doesn’t match every bullet point in the job description, we still encourage you to apply. What matters most is that you’re a builder at heart, you share our values, and you’re enthusiastic about our mission.

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