Senior Java Software Engineer

Nix

Bulgaria (European Union, LATAM, Ukraine) Remote permanent

Posted: May 5, 2026

Job Description

About our client
Our customer 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.

About TheRole

Our Senior Backend Software Engineer will be responsible for architecting, developing, and maintaining the high-performance backend services that power the core platform. Leveraging deep expertise in Java and distributed systems, you will collaborate with cross-functional teams to deliver secure, scalable solutions while exploring and integrating cutting-edge blockchain technologies.

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.

• Research and prototype blockchain integration opportunities (e.g., node syncing, client tooling).

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

Required Qualifications

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

• At least 8 years of professional software engineering experience without a degree in Computer Science-related field , or at least 6 with an advanced degree in a different field.

• Strong communication skill and collaboration skills, motivation, problem solving mind set.

• 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.

• Interest or hands-on experience in blockchain, crypto infrastructure, or decentralized systems.

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

• Hands-on experience with BDs, async messaging (Kafka, RabbitMQ, etc.), CI/CD stack

NB: This role requires working hours that overlap with the West Coast (PST) time zone. Candidates are expected to follow the schedules below (Monday–Friday), based on their location:

• LATAM: 11:00 – 20:00

• Colombia: 09:00 – 18:00

• Europe (EET): 12:00 – 21:00

• Europe (CET): 11:00 – 20:00

Please note that alignment with these working hours is an essential requirement of the role.

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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