As a Senior Backend Software Engineer based in Tallinn, you will be responsible for architecting, designing, developing, and deploying Bolt's growing backend systems, mostly via coding in Node.js and TypeScript (no prior Node.js experience needed). You'll work on unique product challenges including complex algorithms for demand prediction, optimal real-time pricing, routing, fraud detection, and distributed systems, collaborating closely with key internal stakeholders to scalably design backend systems and APIs.