Senior Staff Full-Stack TypeScript Engineer / Tech Lead

Location: Poland (Kraków preferred) Work format: Full-time Project: International fintech payments platform combining traditional payment systems with crypto infrastructure. Responsibilities: - Build and scale a modern fintech payments platform. - Develop real-time processing, settlement, reconciliation, and wallet services. - Provide technical leadership for teams of 5–15 engineers. - Drive architectural decisions, conduct code reviews, and mentor engineers. - Stay hands-on with daily coding and end-to-end technical ownership. Requirements: - 8+ years of production experience with TypeScript/JavaScript (frontend & backend). - Strong expertise in React, Node.js, and GraphQL/Apollo. - Hands-on experience with AWS Serverless architecture. - Strong knowledge of DynamoDB/NoSQL and PostgreSQL. - Proven experience leading technical teams of 5–15 engineers. - Experience with AI-assisted development tools, including 1+ year with Anthropic Claude. - Tech stack: TypeScript, React 19, Node.js, GraphQL/Apollo, AWS, DynamoDB, PostgreSQL, Playwright, CDK. Nice to have: - Experience in fintech/payments, settlement systems, PCI compliance, ledger systems, or fee models. Important: Candidates must be physically located in Poland. Kraków is preferred, but other Polish cities are also considered !!!!