STDev is hiring a Blockchain Developer.
Core technical requirements: - Java - Spring Boot - SQL - 3+ years of production Bitcoin/blockchain experience - Strong Bitcoin network and transaction knowledge - Manual transaction construction - UTXO management and coin selection - PSBT / BIP-174 - SegWit - Bitcoin Script and address types - Secure wallet key management - Multisig architecture and coordination - BIP-48 and BIP-67 - P2WSH - PSBT combination and finalisation - Fee estimation and mempool analysis - RBF and CPFP - Witness data assembly - BIP-143 - DER signature encoding and low-S enforcement - Transaction lifecycle and stuck-transaction remediation - UTXO indexing and balance computation - UTXO consolidation - Deposit and address monitoring - HD wallet gap-limit handling - Change-address derivation and address reuse prevention - Descriptor-based wallet import and recovery - Bitcoin finality, confirmation depth, dust limits and double-spend detection - Experience designing systems combining backend, database and Bitcoin node - Production Bitcoin custody or wallet infrastructure experience
Additional engineering requirements: - TDD and/or BDD - Domain-Driven Design - Monorepo architectures - Shared libraries - Coordinated CI/CD pipelines
