Staff Mobile Engineer H/F Joko

At Joko, we help consumers shop smarter. Our mission is to revolutionize shopping, empowering people to find what they need, make informed decisions, and save money.

Founded in Paris, Joko is a tech company and certified B Corp with over 80 talents across Paris, Barcelona, and New York (and beyond). More than 5 million users already save money every day at 10,000+ merchants with Joko.

From cashback and automatic coupons to price alerts and carbon tracking, we keep expanding our products to make shopping smarter. We're now building an AI-powered shopping assistant to help users find the best products by price, quality, and impact.

Having reached profitability in our core market, we're now scaling globally, with a strong focus on the US.

It's still day 1, come build the future of shopping with us!

Our Engineering team

Our Engineering team excels at solving cutting-edge technical challenges with elegant solutions. With a strong focus on product innovation and design, they are shaping the future of the shopping experience. Their ambition is to have a positive impact on the everyday lives of hundreds of millions of users around the world.

Software Engineers in the Engineering team work hand-in-hand with the Product team, from exploration, design, and roadmap prioritization to implementation, and deployment in production. At Joko, we have firsthand experience that teams with engineers who possess a diverse range of skills, and where engineering and product collaborate closely, are able to deliver a truly delightful and innovative user experience.

The Engineering team is currently growing fast to continuously innovate on all parts of our product and tech stack and to empower the revolution of the way people shop online.

What you will do

At Joko, we value ownership and impact. As our Staff Mobile Engineer, you will own meaningful parts of our mobile application in production, from technical design to delivery and continuous improvement, while collaborating closely with the wider engineering team.

- Mobile architecture & development: Contribute to the definition and evolution of our React Native architecture, while designing, developing, and refactoring features in our mobile application, with a strong focus on scalability, maintainability, and performance.
- Codebase modernization: Incrementally improve an existing React Native codebase by adopting modern patterns, best practices, and platform capabilities, balancing long-term quality with short-term product needs.
- Performance & user experience: Measure, profile, and optimize mobile performance (startup time, rendering, memory, caching), proactively preventing regressions and maintaining a high-quality user experience at scale.
- Tooling & developer experience: Improve mobile developer productivity by evolving tooling, build systems, debugging workflows, and automations, ensuring fast feedback loops and reliable day-to-day development.
- Mobile platform expertise: Provide deep React Native expertise across the team by reviewing designs and implementations, challenging assumptions, and driving better technical solutions in production.
- Release & quality processes: Improve and maintain mobile CI/CD pipelines, testing strategies, and release automation for both iOS and Android.
- API & data integration: Collaborate closely with backend teams to design and integrate robust APIs and data flows, and occasionally contribute targeted improvements to backend code to support mobile product needs.
- Collaboration & mentorship: Participate in technical discussions, review code, and help raise mobile engineering standards across the team.

Who we're looking for

- Mobile experience: Strong experience in mobile development, with a clear expertise in React Native (typically 5+ years).
- Technical excellence: Strong understanding of mobile architectures and performance tradeoffs, with experience building reliable, data-driven applications in production.
- Product-minded: Strong sensitivity to user experience, performance metrics, and real-world usage at scale.
- Problem solver: Comfortable working in complex, evolving codebases, with the patience and pragmatism to improve them incrementally.
- Mobile tooling & delivery: Experience with mobile CI/CD, release processes, testing, and platform-specific constraints (iOS & Android).
- Collaboration: Able to work effectively within a broader engineering team, and collaborate closely with Product Managers and Product Designers to turn product ideas into high-quality mobile experiences.
- Languages: Fluent in English, both written and spoken. French is not required.

Our perks

At Joko, we believe that flexibility and trust are essential. Our work environment reflects this through:

- Flexible remote(only to specific fully remote positions): If you live in Paris, you can choose to work from our office or from home with no constraints. If you live elsewhere, we can provide access to a coworking space and a coworking budget.
- Work from anywhere(full-time only): Want to spend a month in Italy while working? Full-time employees can work from most countries in the world for up to 3 months per year.

On top of that, we offer plenty of perks (some for everyone, others only for full-time positions):

- After 4 years, spend one month in our New York office
- Yearly offsite in amazing locations and budget for team-building events & quarterly in-person gatherings
- Contribution to your ClassPass subscription
- 8-week paid parental leave
- ...and much more, check the full list !

Our hiring process
- Intro call: Quick screening with the Hiring Manager or a recruiter.
- Step 1 - Team interview (45 min): Conversation with two Joko team members (could include the Hiring Manager, people from the team you'd join, or colleagues from other teams).
- Step 2 - Role-specific assessments

- For non-tech roles: Take-home case study followed by a 45 min debrief. We assess both your output and how you think in real time. The exercise will be relevant to the role (e.g. analysis, strategy, or process design).
- For tech roles: Live technical interviews:

- Coding interview + System design interview
- For research internships, an additional round may involve analyzing and presenting a research paper
- Step 3 - Founders interview (45 min): Conversation with two of our founders.
- References: Up to five calls with former colleagues or managers.

You may also be invited for coffee with team members to get a feel for our culture.