Senior Software Engineer, Blockchain

Nix

Ukraine (European Union, LATAM, Ukraine) Remote permanent

Posted: March 18, 2026

Required Skills

Job Description

N-iX is looking for a Senior Software Engineer, Blockchain, to join our team.

Our client is a leading, fully regulated US-based digital asset trading platform. They provide secure, low-latency access to cryptocurrency markets, acting as a bridge between traditional finance and the Web3 ecosystem.

The Senior Blockchain Software Engineer will architect, develop, and maintain the high-throughput backend systems that power a core fintech platform. Utilizing deep expertise in Java and distributed systems, you will take ownership of advanced blockchain integrations, decentralized infrastructure, and crypto-native solutions within a highly secure and regulated environment. This role emphasizes blockchain technologies, offering opportunities to work on integrations, decentralized systems, and crypto infrastructure, making it ideal for engineers passionate about advancing blockchain innovation.

Key Responsibilities:

• Design, build, and maintain high-throughput backend services and APIs in Java.

• Drive architecture discussions to enhance system scalability, resiliency, and performance.

• Prioritize security and compliance as core aspects of service design and delivery.

• Collaborate with product, security, DevOps, and compliance teams on cross-functional initiatives.

• Mentor engineers and lead by example with high engineering standards and best practices.

• Lead research, prototyping, and implementation of blockchain integration opportunities (e.g., node syncing, client tooling, smart contract interactions).

• Advocate for maintainable, modern infrastructure informed by industry best practices.

• Maintain up-to-date documentation of test results and report test coverage and defect trends

Required Qualifications:

• Bachelor’s or Master’s degree in Computer Science or related field.

• ~8 years of professional software engineering experience

• Strong proficiency in Java and experience with modern frameworks and distributed systems.

• Experience with performance optimization (e.g., low-latency systems, microservices).

• Knowledge of security and compliance best practices in financial or regulated contexts.

• Deep interest and/or hands-on experience in blockchain, crypto infrastructure, or decentralized technologies (e.g., EVM-based networks, consensus protocols).

• Strong collaboration and mentorship skills in a fast-moving, cross-functional environment.

Preferred Qualifications:

• Exposure to test automation frameworks and tools (Selenium, Cypress, Postman, or Maestro).

• Experience with API testing and integrating QA processes into CI/CD pipelines.

• Previous background in the FinTech, Crypto, or Web3 sectors.

We offer*:

• Flexible working format - remote, office-based or flexible

• A competitive salary and good compensation package

• Personalized career growth

• Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)

• Active tech communities with regular knowledge sharing

• Education reimbursement

• Memorable anniversary presents

• Corporate events and team buildings

• Other location-specific benefits

*not applicable for freelancers

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