Sumsub is the first AI-powered trust infrastructure for compliance operations at scale. It connects identity and business verification, fraud prevention, transaction monitoring, and risk workflows, helping teams reduce manual work and enter new markets. Trusted by over 4,000 clients across financial services, crypto, mobility, trading, marketplaces, education, and iGaming, including Bybit, Bitpanda, Wirex, Avis, Vodafone, Duolingo, Kaizen Gaming, and Bancaribe.
Our 1,000+ people around the world back it up, too: 92% are proud to be Sumsubers, and 90% say their work is interesting and challenging.
Now we are looking for a Senior Backend Engineer to build backend services for the Travel Rule product. Design and develop backend services for the Travel Rule product, enabling secure data exchange between crypto service providers
Collaborate with product and engineering teams to evolve the platform and support new regulatory and network requirements
Take ownership of backend components from design through production and long-term maintenance




Strong backend engineering experience (Java or similar languages) with a solid foundation in system design.
Good understanding of databases (MongoDB, ClickHouse, or similar) and data consistency trade-offs.
Bonus: familiarity with crypto, blockchain fundamentals, or how crypto networks and wallets operate.
Remote-first, trust-based culture. No mandatory office days, no attendance trackers. Extra time off. Your birthday is a holiday here. Add to that 10 personal days each year, seven sick days without paperwork, and extra time to enjoy Christmas and New Year. Our mission is to build a digital world that is secure, accessible and inclusive for everyone. From fighting fraud to making online services easier and safer to use, your work will have a real impact on how people experience trust online.
Truly general. We support your progress with learning opportunities and by covering role-specific events, from design conferences to marketing fo

📌 (Senior) Backend Developer * (España)
🏢 Sumsub
📍 España