Senior BackEnd Developer
GB2B - GamingB2B · Warszawa, Poland ·
- Seniority
- Senior
- Category
- Backend
- Experience
- 5+ years
- Build, maintain, and optimize backend services using Node.js (Nest.js / Express.js).
- Improve existing systems, resolve complex issues, and contribute to new high-performance platform features.
- Design and implement scalable architectures for high-traffic, distributed environments.
- Work with PostgreSQL and MongoDB, ensuring performance, optimization, and data integrity.
- Manage and deploy cloud-based architectures (AWS / GCP / Azure).
- Contribute to performance tuning, load balancing, and Kubernetes-based deployments.
- Collaborate closely with cross-functional teams to deliver secure, reliable, and
- maintainable solutions.
- Apply best practices for data privacy, security, and high-availability services.
- Participate in technical and architectural discussions, helping evaluate trade-offs between system performance, reliability, scalability, and business needs.
Requirements:
- 5+ years of experience building backend systems with Node.js, using Nest.js or
- Express.js.
- Strong expertise with PostgreSQL, MongoDB, and cloud database environments.
- 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 structures, and cloud infrastructure
- Familiarity with security standards and data protection principles.
- Demonstrated platform and product mindset — ability to assess technical decisions in the context of reliability, scalability, user impact, and business constraints.
- Excellent problem-solving skills with a proactive, solution-oriented approach.
- Strong communication skills and ability to collaborate effectively within cross-functional teams.
Why Join GB2B:
- Be part of an innovative team shaping the future of the iGaming industry.
- Work on meaningful, high-impact projects at global scale.
- Competitive, rewarding compensation package.
If building reliable, scalable backend systems motivates you, we’d love to meet you.