Founding Senior Payments Engineer, Backend & Blockchain

Role overview Lead the technical build of a self-custodial stablecoin wallet, taking payment infrastructure from an early prototype into production. The role combines backend engineering with blockchain integrations, with a focus on dependable consumer payments, security, accuracy, and ease of use.

Responsibilities - Design and implement embedded wallets, wallet recovery, key export, and secure transaction signing. - Build stablecoin transfers on Solana and resolve usernames or phone numbers to wallet addresses. - Develop payment flows such as personal and merchant QR payments, requests, receipts, and transaction history. - Implement sponsored fees or gas abstraction, plus monitoring and reconciliation for blockchain activity. - Integrate identity checks, on/off-ramp services, and card payments. - Own architecture and help move the first payment system from prototype to production.

Requirements - Strong experience building production backend systems in Go, TypeScript, or a similar language. - Practical experience with Solana and SPL tokens, including building or integrating wallets and transactions. - Experience with payment APIs, webhooks, idempotency, and reconciliation. - Knowledge of private-key security, signing, and wallet recovery. - Experience with PostgreSQL and scalable backend design. - Ability to work independently and make security-minded architectural decisions.

Nice to have - Experience with embedded wallet providers, stablecoins such as USDC or USDT, payment on/off-ramps, card issuers, or blockchain indexing tools. - Experience taking consumer fintech products from prototype to production.

Benefits and work setup - Full-time, remote role at the founding stage.