Mid-Senior Crypto Developer
Infoplus Technologies UK Limit
Warsaw, Poland
Contract · Onsite
30 Sep, 2026
Skills
Solidity
Java
Ethereum
About the Role
**Key Requirements**
- 12+ years of work experience with a Bachelor’s Degree or 8 +years of relevant experience with an Advanced Degree (e.g. Masters, MBA, JD, MD)
- Strong experience in building scalable, high-performing distributed systems including APIs, orchestration layers, 3rd party integrations, monitoring & alerts, and high availability
- Strong experience in the entire Secure Software Development Life cycle including version control, CI/CD, unit-testing and performance testing
- Strong understanding of blockchain technologies (public and permissioned), De-Fi apps, security protocols, private key custody, distributed ledgers – Bitcoin, Ethereum, Hyperledger etc.
- Strong understanding of Solidity, Assembly, and the EVM technologies
- Full-stack software development experience a plus
- Motivated and fast learner of new technologies to solve complex problems
- Experience in payments and financial services compliance, payments ecosystems and payment processing flows
- Strong interpersonal, facilitation, and leadership skills along with effective communication (both written and verbal) skills and the ability to present complex ideas in a clear, concise way; ability to influence and develop relationships with key partners
**Key Responsibilities**
- Design, develop, and maintain enterprise-grade crypto and blockchain-based products.
- Build scalable, high-performing distributed systems, APIs, orchestration layers, and 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 to deliver seamless user experiences using Angular.
- Ensure application security, reliability, monitoring, and high availability.
- Implement and maintain CI/CD pipelines, testing frameworks, and software quality standards.
- Work closely with cross-functional stakeholders to deliver innovative solutions in the digital payments and financial services domain.
- Troubleshoot complex technical issues and continuously improve system performance and scalability.
- Stay current with emerging blockchain, cryptocurrency, and financial technology trends.
**FYI**
- Preference for candidates with blockchain, crypto, fintech, or payments domain experience.
- Experience in both backend (Java) and frontend (Angular) development is highly preferred.
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