Blockchain Developer

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