Staff Software Engineer (Rust)

Finary Backend Engineer

You'll design and build high-performance backend services in Rust for a fintech platform serving 600,000+ users. You'll join a team of 6 Rust engineers across multiple squads, with flexibility to work on investment products, crypto, or life insurance infrastructure.

Your responsibilities will include:

• Building and scaling backend systems that power portfolio tracking, investing, and financial data aggregation for hundreds of thousands of users
• Designing APIs and distributed systems that handle real-time financial data with high reliability
• Writing production-ready Rust code with a focus on performance, security, and maintainability
• Collaborating with web and mobile teams to ship end-to-end features
• Working with PostgreSQL, message queues, and GCP infrastructure

We're looking for candidates who:

• Have Rust expertise: You understand Rust's memory safety and concurrency model, and have shipped production-quality code
• Have SQL and async systems: Strong PostgreSQL skills and experience with message queues for resilient systems
• Can architect distributed systems & API design: You can architect scalable systems that meet fintech-grade reliability demands
• Are strong problem-solvers: You diagnose complex issues and devise effective solutions
• Have good communication skills: You balance technical decisions with business needs and collaborate well across teams
• Are a team player: You're humble and like helping others grow
• Have English fluency, written and spoken

Nice to have:

• Expertise in performance optimization and profiling
• Experience mentoring peers
• Passion for personal finance and investing

Compensation

• Level 1 (learning the craft): €55-65k
• Level 2 (level 1 + autonomy): €65-80k
• Level 3 (level 2 + ownership): €80-100k
• Level 4 (level 3 + technical leadership): €100-115k
• Level 5 (level 4 + shapes company direction): €115-130k

*We can go higher for outstanding profiles. All packages come with an equity package. This role is open from Level 3 to Level 5 depending on experience.

Team

You'll join one of our product squads (One, Crypto, Life, or others) based on needs and fit. Currently 10 Rust engineers work across these teams. You'll have ownership from day one, freedom to make technical decisions, and the opportunity to shape our backend architecture.

Benefits

• Hybrid setup: teammates across France and Europe, with in-person weeks in Paris 6 times per year (travel and accommodation covered)
• High-performing environment with A-players who challenge you and help you grow
• Impact that matters: build products that help people take control of their financial future

We ship fast and iterate constantly. We break complex problems into small pieces, get feedback from our community, and polish as we go. We believe the best products come from user research, analytics, and gut feeling.

Even if you don't check every box, we encourage you to apply. We value diverse perspectives and are more interested in your potential than a perfect match to our checklist.