Blockchain Developer

We are looking for a Blockchain Developer to join a long-term project focused on institutional digital asset and Bitcoin wallet infrastructure.

The role is focused on building and supporting secure Bitcoin-related solutions, including transaction processing, UTXO management, multisig and wallet infrastructure.

Requirements

• 3+ years of production experience in blockchain development, with strong hands-on experience with Bitcoin
• Strong understanding of the Bitcoin network and transaction lifecycle
• Experience with UTXO management and manual transaction construction
• Strong knowledge of PSBT, SegWit, Bitcoin Script and address types
• Experience with multisig wallets
• Understanding of fee estimation, RBF and CPFP
• Experience with Bitcoin wallet or custody infrastructure
• Strong Java, Spring Boot and SQL
• Familiarity with TDD and/or BDD
• Understanding of Domain-Driven Design principles
• Experience working with monorepos and CI/CD pipelines
• Good communication skills and ability to work in a cross-functional team
• English — B2 or higher

Responsibilities

• Develop and maintain Bitcoin wallet infrastructure
• Work with UTXO management and transaction construction
• Implement and support PSBT, SegWit and multisig workflows
• Work with transaction fees, RBF and CPFP
• Contribute to backend architecture and integrations with Bitcoin nodes
• Monitor and troubleshoot production issues
• Participate in technical design and development of new features
• Collaborate with other engineers across the project

What we offer

• Full-time, remote position
• Long-term cooperation
• Flexible location within the EU, with a particular focus on Ukraine and the Balkans
• Opportunity to work on institutional-grade blockchain infrastructure
• Start: ASAP