Senior Backend Web Developer

Senior Backend Web Developer - Client Facing Platform EMEA (F/M/D) Head of Talent Acquisition @ Flowdesk | Building the Future of Finance Flowdesk's mission is to build a global financial institution for digital assets, one designed from the ground up for market integrity and efficiency. To achieve this in a rapidly evolving market, we apply a disciplined, first-principles approach to everything we do. This approach is embedded in our core services, from institutional liquidity provision, trading solutions, OTC execution to our comprehensive treasury management offerings. This is how we cut through the noise and build robust and scalable systems across all our business lines. We seek individuals who are driven by this systematic approach. Joining Flowdesk means you will be a key contributor in building and scaling a more transparent and efficient financial markets infrastructure. At Flowdesk, our client platform is the front door to everything we do. It's how institutional clients access trading, settlement, and reporting with confidence. We're looking for a senior backend engineer who can own this platform end-to-end from the API layer to the workflows our clients depend on every day. This is a hands-on role. You'll design and build backend services in Rust, and you'll set the direction for a small team of backend and fullstack engineers. Together, you'll deliver a product that is fast, reliable, and safe for clients. Security and correctness aren't add-ons here - they're the foundation of our business. What you'll do Take technical ownership of the client-facing platform - design, delivery, and continuous improvement. Lead and mentor a small team, keeping the bar high on code quality and secure engineering practices. Work directly with product managers and frontend engineers to turn client needs into seamless, end-to-end workflows. Build and evolve APIs in Rust, with security and clarity at their core. Ensure everything shipped follows best practices (OWASP Top 10, SQL safety, authentication/permissions). Keep close to the product - think about features not just as code, but as tools our clients use to trade with confidence. Requirements 5+ years of backend engineering, with significant time in crypto, fintech, or trading environments. Production experience in Rust is required. Proven track record building secure, client-facing APIs. Strong knowledge of SQL and event-driven systems. A product mindset - you care about the "why," not just the "how." Experience mentoring or leading engineers in small teams. A pragmatic commitment to shipping high quality systems. Nice to have Familiarity with trading workflows (orders, balances, settlements). Contributions to Rust or security-related open source projects. Understanding of regulatory/compliance in financial platforms. Benefits International environment (English is the main language) 50% of transportation costs & a sustainable mobility agreement Swile lunch voucher (€9.25 per day, 60% covered) 100% Alan Blue covered for you and your children Wellpass contribution to gym membership Team events and offsites Here's What You Can Expect If You Apply HR call (30') Get to know Flowdesk and discuss your experience. Technical Interview with our Head Of Engineering (90'), Deep dive into your technical background and problem-solving abilities. Team fit (60'), Get to know you future teammates and get an introduction to our working environment. Wrap Up Interview (45'), Learn about Flowdesk's culture and how we work. C-Level Interview (30') We focus on conversations, not trick questions. These discussions will help you understand how Flowdesk operates and allow you to share your journey and what you're looking for in your next role. We are committed to an inclusive and accessible recruitment process. If you require any reasonable adjustments or have specific needs to enable you to participate fully in the interview or assessment process (e.g., a sign language interpreter, extra time for a test, or an accessible location), please contact us to discuss how we can support you. Seniority level Mid-Senior level Employment type Full-time Industries Technology, Information and Internet Get notified about new Senior Web Developer jobs in Paris, Île-de-France, France. Location Paris, Île-de-France, France #J-18808-Ljbffr