Blockchain Developer

Job description

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