Location: On-site (Warsaw)
Company: GB2B
Industry: iGaming / Platform Development
GB2B is a leading technology provider in the iGaming industry, building robust admin panels and management systems that power high-traffic platforms. We are looking for an experienced Senior Node.js Developer to join our growing backend team.
Responsibilities
Develop, maintain, and optimize backend systems using Node.js (Nest.js / Express.js)
Analyze and improve existing systems, fix bugs, and contribute to new high-performance platform developments
Design and implement scalable solutions for high-traffic and complex distributed systems
Work with PostgreSQL and MongoDB databases, ensuring performance, optimization, and data consistency
Manage and deploy cloud-based architectures (AWS / GCP / Azure)
Contribute to performance tuning, load balancing, and Kubernetes-based deployments
Collaborate with cross-functional teams to deliver reliable and secure solutions
Apply best practices for data privacy and application security
Requirements
5+ years of professional experience with Node.js, including Nest.js or Express.js frameworks
Strong proficiency in PostgreSQL, MongoDB, and cloud database management
Proven experience with high-traffic, large-scale, and complex system architectures
Hands-on experience with Kubernetes, load balancing, and performance scaling strategies
Solid understanding of system design, data optimization, and cloud infrastructure
Familiarity with security standards and data protection principles
Excellent problem-solving skills and ability to propose effective, scalable solutions
Good communication skills and a proactive, solution-oriented mindset
Why Join GB2B
Be part of an innovative team shaping the future of the iGaming industry
Work on challenging, large-scale projects with cutting-edge technologies
Competitive compensation package
If you are passionate about building scalable, high-performance, and secure backend systems — we’d love to meet you.