Mobile Engineer

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 builds the technology that powers our mission - a product that people actually use, trust, and care about. We work in small, cross-functional squads with real ownership and short feedback loops. As a mobile engineer, you'll own features end to end, work directly with designers and product, and ship things that land in the hands of hundreds of thousands of users. We work across four squads - Banking, Savings, Growth, and Platform. You'll be placed into a squad based on your strengths and where you can have the most impact. WHAT YOU'LL BE DOING * Own features from scoping through to production - you'll shape the approach, make the technical decisions, and see it through * Work closely with engineers, designers, and product in a fast-moving, cross-functional squad * Build a well-tested, performant app that communicates with Bitstack's backend infrastructure * Bring high-quality, accessible user interfaces to life with an emphasis on polish and user experience * Ship reliable, scalable products in a production environment and take accountability for what you build * Write tests - unit, integration, and otherwise - and care about code quality throughout * Work in a highly compliant financial environment where security and reliability are non-negotiable * Contribute to the broader tech and open source communities TECH STACK * Backend: Go, Python * Frontend: Flutter, Dart, TypeScript, JavaScript * Databases: SQL WHAT WE'RE LOOKING FOR * Native iOS or Android experience is a must - when Flutter hits its limits, you know how to go deeper into the native layer * A product-first mindset - you care about the impact your work has on users, not just how the code is written * Strong ownership instincts - you scope, build, and support your work end to end without waiting to be told what to do * Experience working in small, cross-functional teams where you've had to make real decisions * Understanding of mobile application lifecycles, software development practices, and integration testing * Solid Git workflow knowledge and comfort with automation * Clear, direct communication - you can talk through your thinking, take feedback, and push back when you need to * Fluent English - French is a bonus INTERVIEW PROCESS 1. Introductory Call (30 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 2. Engineer Call (30 min) A chat with one of our engineers to go a bit deeper into your experience at a high level, find out a bit more about how you think about mobile apps, as well as a basic question around architecture. You will also have a chance to find out more about our engineering culture. 3. System Design (60 min) A discussion focused on how you approach problem-solving, communicate your ideas, and prioritise decisions. This helps us assess your technical depth and ability to design scalable systems 4. 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 5. 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. #LI-TT1

Teya

Hello. We’re Teya. Teya was founded on a simple belief: local businesses deserve better. They are the cafés, restaurants, salons, shops and entrepreneurs that bring character to our high streets, create jobs and keep communities moving. Yet for too long, financial services has made life harder for them - with clunky tools, poor support and complexity that gets in the way of running a business. Teya exists to change that. We’re building a financial platform for local businesses across Europe - one built around simple tools, thoughtful design and real human support. Our Members rely on us to help them run their business with confidence, and that responsibility shapes the way we work. We move fast. We care about quality. We stay close to the detail. And we believe great performance and genuine hospitality should go hand in hand. If you want to build meaningful products, solve real problems and make a genuine difference for local businesses, we’d love to hear from you Your Mission To empower small and medium-sized businesses across Europe by building and enhancing Teya’s mobile applications. Deliver scalable, secure, and innovative solutions that help business owners thrive and reconnect with the joy of running their businesses. As a Mobile Software Engineer at Teya, you will: * Develop cross-platform mobile applications using Kotlin. * Write clean, maintainable, and secure code to address complex business problems. * Prioritize performance, scalability, and maintainability in all development tasks. * Seamlessly integrate various APIs and SDKs, ensuring reliability and efficiency. * Focus on delivering a modern, intuitive, and user-friendly experience for merchants across Europe. * Collaborate with cross-functional teams to align technical solutions with business objectives. * Actively participate in critical project decisions, including architecture design, framework selection, and tool evaluation. * Mentor and support team members, fostering a collaborative and growth-oriented environment. * Continuously improve applications while applying automation best practices to reduce waste and error. * Work within Agile/Scrum methodologies, ensuring timely delivery, iterative improvements, and collaboration across teams.   Key Responsibilities * Build mobile applications that support payments acceptance, business account services, card issuing, and ePOS systems. * Incorporate state-of-the-art technologies to enable offline capabilities, secure data storage, and dynamic app features like push notifications and deep linking. * Ensure seamless app upgrades and support internationalization/localization. * Collaborate with design and product teams to deliver a compelling user experience. * Contribute to CI/CD pipelines, scalable logging, and observability practices. * Embrace clean architecture principles, including Domain, Application, Infrastructure, and Presentation layers. * Participate in daily stand-ups, sprint planning, and retrospectives as part of Agile workflows. * Work closely with Product Owners to refine requirements and deliver incremental value in each sprint. What you'll build * Cross-platform payment SDKs that work seamlessly on Android and iOS * Device abstraction layers that enable payment processing across different hardware configurations * Developer tools and documentation that make payment integration simple and reliable * Standardized APIs that reduce complexity for third-party integrators * Secure, compliant payment processing components that meet industry standards   Your Story:   Essential Requirements * Kotlin Multiplatform Experience: Hands-on experience developing and shipping KMP projects, including shared business logic and platform-specific implementations * Mobile Development: Strong background in either Android (Kotlin) or iOS development with understanding of mobile app architecture patterns * SDK Development: Experience building SDKs, libraries, or frameworks that other developers consume, with focus on API design and developer experience * Payment Technology Knowledge: Understanding of payments, NFC technology, financial transaction processing, banking Technical Skills * Advanced Kotlin: Deep expertise in Kotlin language features, coroutines, and multiplatform-specific APIs * Cross-Platform Architecture: Understanding of shared code strategies, expect/actual patterns, and platform-specific implementations * API Integration: Experience with RESTful services, secure communication protocols, and third-party API integration * Testing & Quality: Strong testing practices including unit testing, integration testing, and automated testing frameworks * Security Awareness: Understanding of secure coding practices, especially relevant to financial/payment applications Preferred Qualifications * Experience with payment processing systems, EMV standards, or financial technology * Knowledge of NFC technology, contactless payment protocols, or mobile payment frameworks * Background in modular architecture, dependency injection, and clean architecture principles * Experience with CI/CD pipelines and automated deployment for multi-platform projects * You have experience with design tools such as Figma and Canva * You’re highly organised with strong project management skills * You’re a great communicator and collaborator * You have a growth mindset with eagerness to learn and a hands-on attitude   The Perks * We trust you, so we offer flexible working hours, as long it suits both you and your team; * Health Insurance; * Meal Allowance; * 25 days of Annual leave (+ Bank holidays); * Public Transportation Card; * Frequent team events & activities in the office and outside; * Office snacks every day; * Friendly, comfortable and informal office environment. Teya is proud to be an equal opportunity employer. We are committed to creating an inclusive environment where everyone regardless of race, ethnicity, gender identity or expression, sexual orientation, age, disability, religion, or background can thrive and do their best work. We believe that a diverse team leads to better ideas, stronger outcomes, and a more supportive workplace for all. If you require any reasonable adjustments at any stage of the recruitment process whether for interviews, assessments, or other parts of the application—we encourage you to let us know. We are committed to ensuring that every candidate has a fair and accessible experience with us.

Stripe

WHO WE ARE ABOUT STRIPE Stripe is a financial infrastructure platform for businesses. Millions of companies—from the world's largest enterprises to the most ambitious startups—use Stripe to accept payments, grow their revenue, and accelerate new business opportunities. Our mission is to increase the GDP of the internet, and we have a staggering amount of work ahead. That means you have an unprecedented opportunity to put the global economy within everyone's reach while doing the most important work of your career. ABOUT THE TEAM The Direct Surfaces Team's mission is to make it delightful for users to manage their money. We're rebuilding and unbundling the core of Stripe so that no matter what the business, the location, or the use case there is a single place that can fulfill all financial needs: Stripe Treasury. This is a 0 → 1 new business at Stripe, so if that sounds exciting we'd love to hear from you. WHAT YOU'LL DO Engineers at Stripe are comfortable working on new products under fluid conditions, seamlessly balancing tactical and strategic considerations all in service of our users. RESPONSIBILITIES * Deliver a world-class mobile experience for Treasury users, including working with our partners to design and launch new features and capabilities * Scope and lead technical projects, laying the groundwork for our products to iteratively evolve and scale  * Design, build, expand, and maintain mobile-specific view cross-platform components, backing APIs and their services  * Align our technical decisions with the broad strategic initiatives at Stripe, while also advocating for needs specific to emerging new businesses  * Work with engineers across the company to understand when to leverage existing infrastructure versus when building a bespoke solution is prudent  * Make effective tradeoffs that consider business priorities, user experience, and a sustainable technical foundation WHO YOU ARE We're looking for someone who meets the minimum requirements to be considered for the role. If you meet these requirements, you are encouraged to apply. The preferred qualifications are a bonus, not a requirement. MINIMUM REQUIREMENTS * Have a strong technical background, including 3+ years of industry experience * Have experience building mobile applications including working beyond just the client * Understand good practices when building and working with UIs and APIs * Measure your success in terms of business impact, not lines of code * Internalize the best ideas from across the organization, humbly setting a vision that others are excited to get behind * Work well cross-functionally and earn trust from coworkers at all levels. You are often cited as the inspiration for engineers who join your team * Care deeply about mentorship and growing engineers • Prefer simple solutions and designs over complex ones, and have a good intuition for what will last and scale * Thrive in a collaborative environment * Enjoy working with a diverse group of people with different areas of expertise. Engineering works closely with a variety of teams including Sales and Support to better understand our customers' needs, Legal and Accounting to understand how global policies influence our money-moving infrastructure, and more PREFERRED QUALIFICATIONS * Have experience using React Native * Have experience in ensuring great user experience and ease of use of features for products you build * Have experience with financial product companies and interest in financial products and markets