Senior JavaScript Engineer

Location: Warsaw, Poland Workplace: hybrid At TechBiz Global, we are providing recruitment service to our TOP clients from our portfolio. We are currently seeking a Senior JavaScript Engineer to join one of our clients ' teams. If you're looking for an exciting opportunity to grow in a innovative environment, this could be the perfect fit for you. What You Will Do: Work on specific problem spaces critical to the client’s needs, with opportunities to switch teams as both you and our fast-paced business evolve. Utilize cloud technologies, primarily AWS , to develop, deploy, and scale services. Participate in the full project lifecycle _ from concept and design to deployment and ongoing maintenance - ensuring timely and high-quality delivery. Collaborate closely with cross-functional teams across the client’s organization to align on integrations and optimize overall system architecture. Drive a strong engineering culture focused on code quality, best practices, innovation, and continuous improvement . Proactively identify, troubleshoot, and mitigate potential issues in distributed and financial systems . Work in small, autonomous teams with short release cycles and a strong sense of ownership. Who You Are: Proficient in JavaScript , with strong hands-on experience in backend development using Node.js (e.g., Express, NestJS, or similar frameworks). Experienced with PostgreSQL and designing, architecting, and building reliable, scalable backend systems. Comfortable working with cloud technologies , particularly AWS (e.g., EC2, Lambda, S3, RDS, etc.). Familiar with distributed systems and financial-domain challenges, with the ability to anticipate and address potential issues early. A strong communicator who can effectively collaborate with engineers, product managers, and other stakeholders across teams. Fluent in verbal and written English , with the ability to clearly explain technical concepts.