Senior Backend Developer / Tech Lead (TypeScript/Node.js)

Join our remote team as a Senior Backend Developer/Tech Lead, focusing on fintech products like crypto wallets and cards. Lead backend architecture and drive performance with AI-powered tools.

• •Own backend architecture across two large-scale platforms (30+ and 25+ microservices) — system design, API contracts, data flow, inter-service communication.
• •Lead complex integrations with payment providers, card issuers, and blockchain networks — retries, circuit breakers, graceful degradation in production.
• •Drive performance: profile slow services, design caching strategies, optimize queries, plan for scale.
• •Shape technical direction and make architectural decisions.
• •Build and extend AI-powered internal tools and automations — our team runs LLM-based systems across the full dev cycle, and you'll take it further.

• •Fully remote — international team, async-friendly culture.
• •Two career tracks: grow into Tech Lead or go deep as Staff/Principal IC. Your call.
• •Real architectural ownership — not ticket execution. You shape how the platform evolves.
• •An engineering culture built around AI tools at every stage: analysis, implementation, code review.
• •Competitive salary, transparent feedback, low bureaucracy.

• •5+ years TypeScript/Node.js in production. NestJS for 2+ years — modules, guards, interceptors, microservice transports.
• •Deep PostgreSQL: schema design, indexing, EXPLAIN ANALYZE, zero-downtime migrations, database-per-service pattern.
• •Real microservices experience — RPC + pub/sub, message brokers, idempotency, eventual consistency, saga/outbox. Not a monolith split into folders.
• •Production blockchain (MUST-HAVE) — HD wallets (BIP32/BIP39), smart contracts, ABI, multichain, on-chain transactions with real user funds. ethers.js / viem / @solana/web3.js.
• •AI-driven workflow (MUST-HAVE) — you use Claude, Copilot, or Cursor daily. You've built automations or LLM-powered tools, not just prompted ChatGPT for code snippets.
• •System design skills — you can whiteboard a distributed system and defend every decision to engineers and stakeholders alike.
• •English Upper-Intermediate. Russian — fluent.