Staff Software Engineer (Rust)
About Finary
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 600,000+ 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.
TL;DR
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.
What you'll do
Build and scale backend systems that power portfolio tracking, investing, and financial data aggregation for hundreds of thousands of users
Design APIs and distributed systems that handle real-time financial data with high reliability
Write production-ready Rust code with a focus on performance, security, and maintainability
Collaborate with web and mobile teams to ship end-to-end features
Work with PostgreSQL, message queues, and GCP infrastructure
What we're looking for
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
What we offer
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
How we work
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.