Mobile Engineer

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

    1. Introductory Call (20 min)
       An initial conversation with our recruiter 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

       Please note - we currently can only hire people who are based in the EU with working rights. If you need sponsorship we can provide this in France only.

       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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