Mid/ Senior Crypto Developer
Summary
Designs and builds enterprise-grade crypto/blockchain products and digital payments solutions: Java backend services, APIs and distributed systems, Angular frontend collaboration, secure SDLC with CI/CD, and work across Bitcoin, Ethereum, Hyperledger and Solidity/EVM. Hybrid role in Warsaw, 1-3 days onsite weekly.
Mid-Senior Crypto Developer
Location: Warsaw, Poland
Work Model: Hybrid – 1–3 days per week onsite
Contract: Contract
DCV/WP/VS/29.09.28
About the Role
We are looking for experienced Mid-Senior Crypto Developers to join a technology team in Warsaw, working on enterprise-grade cryptocurrency, blockchain and digital payments solutions.
The role combines strong software engineering with hands-on knowledge of blockchain technologies, distributed systems and secure application development. Send Cv to marcillina.tietjen@dcvtechnologies.co.uk if you are interested
Key Responsibilities
Design, develop and maintain enterprise-grade crypto and blockchain-based products.
Build scalable, high-performing distributed systems, APIs and orchestration layers.
Develop and maintain third-party integrations.
Drive end-to-end software development from architecture and design through deployment and production support.
Develop and enhance backend services using Java and modern engineering practices.
Collaborate with frontend teams using Angular.
Ensure application security, reliability, monitoring and high availability.
Implement and maintain CI/CD pipelines, testing frameworks and software quality standards.
Work with cross-functional stakeholders on digital payments and financial-services solutions.
Troubleshoot complex technical issues and continuously improve system performance and scalability.
Stay current with blockchain, cryptocurrency and financial-technology developments.
Key Requirements
12+ years of work experience with a Bachelor's degree OR 8+ years of relevant experience with an advanced degree such as a Master's, MBA, JD or MD.
Strong experience building scalable, high-performing distributed systems.
Experience with APIs, orchestration layers and third-party integrations.
Strong understanding of monitoring, alerting and high-availability environments.
Strong experience across the Secure Software Development Lifecycle, including:
Version control
CI/CD
Unit testing
Performance testing
Strong understanding of blockchain technologies, both public and permissioned.
Understanding of DeFi applications and blockchain security protocols.
Knowledge of private-key custody and distributed ledgers.
Experience/knowledge across technologies such as Bitcoin, Ethereum and Hyperledger.
Strong understanding of Solidity, Assembly and EVM technologies.
Experience within payments and financial services, including payments ecosystems, payment-processing flows and compliance.
Strong communication, facilitation and leadership skills.
Highly Preferred
Blockchain, crypto, fintech or payments domain experience.
Backend development using Java.
Frontend development using Angular.
Full-stack software development experience.
Important
Candidates must be able to work hybrid in Warsaw, 1–3 days per week onsite and be comfortable completing a coding assessment as part of the recruitment process.