Mid/ Senior Crypto Developer

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 [email protected] 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.