Staff Software Engineer (Rust)

We're building a one-stop shop for investing that gives power back to individual investors. Finary lets users track their assets, manage budgets, invest money, and learn about finance, all in one place.

Launched in 2021, we've grown to 800,000+ users. In September 2025, we closed a €25M Series B led by PayPal Ventures, with backing from Y Combinator, Hedosophia, Speedinvest, and founders from Qonto, Photoroom, Bitpanda, UBS, and Wise.

We care deeply about user experience, performance, and shipping products that genuinely improve people's financial lives.

You'll design and build high-performance backend services in Rust for a fintech platform serving 800,000+ users. You'll join a team of 10 Rust engineers across multiple squads, with flexibility to work on investment products, crypto, or life insurance infrastructure.

• Design and build scalable, reliable, and high-performance backend systems using Rust and distributed systems best practices.

• Drive technical direction across teams by shaping architecture decisions, defining engineering standards, and aligning technology with business goals.

• Lead complex technical initiatives end-to-end, from system design and implementation to rollout and long-term maintainability.

• Collaborate closely with product and engineering teams to deliver pragmatic solutions that balance scalability, quality, and execution speed.

• Mentor engineers and contribute to a strong engineering culture through knowledge sharing, technical guidance, and continuous improvement initiatives.

• Rust expertise: You understand Rust's memory safety and concurrency model, and have shipped production-quality code

• SQL and async systems: Strong PostgreSQL skills and experience with message queues for resilient systems

• Distributed systems & API design: You can architect scalable systems that meet fintech-grade reliability demands

• Problem-solving: You diagnose complex issues and devise effective solutions

• Communication: You balance technical decisions with business needs and collaborate well across teams

• Team player: You're humble and like helping others grow

• English fluency, written and spoken

Nice to have:

• Expertise in performance optimization and profiling

• Experience mentoring peers

• Passion for personal finance and investing

• Level 1 (learning the craft): €30-60K

• Level 2 (level 1 + autonomy): €60-80K

• Level 3 (level 2 + ownership): €70-90K

• Level 4 (level 3 + technical leadership): €80-110K

• Level 5 (level 4 + shapes company direction): €100-130K

This role is targeted at Level 4, depending on the candidate’s experience.

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.

• 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.