Description We’re looking for exceptional and experienced Backend JavaScript Developers to join our Proxy Network team. This team builds and operates core backend services that power Bright Data’s networking infrastructure - high-performance, highly reliable systems with deep focus on networking, security, and scale. In this role, you will take end-to-end ownership of services and features in production, working on challenging problems around network traffic, protocols, performance, and reliability. Tech Stack: Node.js, JavaScript, MongoDB, Redis, Kubernetes, AWS Responsibilities • End-to-end feature development, from design and implementation to production rollout and ongoing improvements. • Build and maintain high-scale backend services with strong emphasis on performance, reliability, and security. • Participate in system design and architecture planning to ensure scalable and maintainable solutions. • Work on networking-related challenges such as traffic flows, proxy behavior, request/response handling, and protocol-level edge cases. • Investigate and troubleshoot complex networking issues using tools such as Wireshark (and similar packet inspection/debugging tools). • Write high-quality, maintainable code with appropriate test coverage; participate actively in code reviews. • Collaborate closely with engineers and stakeholders to deliver impactful solutions. • Continuously learn and apply best practices in backend engineering and networking. Requirements • 5+ years of hands-on software engineering experience, including 2+ years focused on backend JavaScript / Node.js development. • Very good understanding of how the Node.js event loop works, including practical knowledge of the platform’s strengths and limitations (I/O vs CPU-bound workloads, async patterns, blocking pitfalls, memory/GC considerations). • Proven experience building and operating production backend services. • Strong understanding of network protocols and security, including: TCP/IP/UDP, DNS, HTTP1/2/3, TLS and WebSockets. • Experience with databases and caching layers such as MongoDB and Redis. • Familiarity with Kubernetes and containerized deployments. • Proficient in system design fundamentals: APIs, scalability, performance, reliability, and fault tolerance. • Fast learner, able to work independently and as part of a team. • Proficiency in English, with strong written and verbal communication skills. Nice to Have: • Experience with AWS and SaaS environments. • Experience debugging production networking issues (latency, packet loss, connection reuse, TLS handshakes, etc.). • Experience with observability tooling (logs/metrics/tracing) and incident response/on-call.