Senior Java Engineer

About us Cobalt Streamworks is a software development service company that helps businesses across the globe develop successful software products. Founded in 2002 in Lviv, Cobalt Streamworks has come a long way and increased its presence in eight countries Poland, Ukraine, Sweden, Bulgaria, Malta, the UK, the US, and Colombia. Today, we are a strong community of 2,000+ professionals and a reliable partner for global industry leaders and Fortune 500 companies. 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 The Role 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