Senior Backend JavaScript Developer

R\&D \& Technical **Senior Backend JavaScript Developer** ======================================= US, REMOTE (Hybrid) #### **Description** We’re looking for exceptional and experienced Backend JavaScript Developers to join our 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.