Senior Backend JavaScript Developer (Proxy Network Team) - San Francisco Office

Bright Data • San Francisco, CA

5d • Onsite

About The Position

The Senior Backend JavaScript Developer will join Bright Data’s Proxy Network team, which builds and operates core backend services powering its networking infrastructure. The role focuses on high-performance, highly reliable systems, with a strong emphasis on networking, security, and scale. The developer will take end-to-end ownership of production services and features and work on challenging problems involving network traffic, protocols, performance, and reliability.

The position involves developing and improving backend services from design through implementation, production rollout, and ongoing maintenance. The role also includes system design and architecture planning, investigating networking issues, writing maintainable code with appropriate test coverage, participating in code reviews, and collaborating with engineers and stakeholders. The technology stack includes Node.js, JavaScript, MongoDB, Redis, Kubernetes, and AWS.

Requirements

• At least 5 years of hands-on software engineering experience, including at least 2 years focused on backend JavaScript or Node.js development.
• Very good understanding of the Node.js event loop and practical knowledge of its strengths and limitations, including I/O versus CPU-bound workloads, asynchronous patterns, blocking pitfalls, and memory and garbage-collection considerations.
• Proven experience building and operating production backend services.
• Strong understanding of network protocols and security, including TCP/IP, UDP, DNS, HTTP/1, HTTP/2, HTTP/3, TLS, and WebSockets.
• Experience with databases and caching layers such as MongoDB and Redis.
• Familiarity with Kubernetes and containerized deployments.
• Proficiency in system design fundamentals, including APIs, scalability, performance, reliability, and fault tolerance.
• Ability to learn quickly and work independently and as part of a team.
• Proficiency in English with strong written and verbal communication skills.

Nice To Haves

• Experience with AWS and SaaS environments.
• Experience debugging production networking issues such as latency, packet loss, connection reuse, and TLS handshakes.
• Experience with observability tooling, including logs, metrics, and tracing, and with incident response or on-call work.

Responsibilities

• Develop features end to end, from design and implementation through production rollout and ongoing improvements.
• Build and maintain high-scale backend services with an emphasis on performance, reliability, and security.
• Participate in system design and architecture planning to create scalable and maintainable solutions.
• Address networking challenges involving traffic flows, proxy behavior, request and response handling, and protocol-level edge cases.
• Investigate and troubleshoot complex networking issues using Wireshark and similar packet inspection and debugging tools.
• Write high-quality, maintainable code with appropriate test coverage and 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.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: No Education Listed