Senior Backend Developer – JavaScript

Brightidea

. Take end-to-end ownership of services and features in production .

Posted 10/26/2026full-timeSan Francisco • California • United StatesSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in backend JavaScript/Node.js development, with a strong focus on building and maintaining high-scale backend services. Proficient in network protocols, system design, and troubleshooting complex networking issues.

Highest-signal resume keywords

Backend JavaScript DevelopmentNode.js Event Loop UnderstandingNetwork Protocols and SecurityDatabase and Caching ExperienceSystem Design Fundamentals

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

JavaScriptNode.jsTCP/IPUDPDNSHTTP1/2/3TLSMongoDBRedisKubernetes

Soft Skills

Strong Written CommunicationStrong Verbal CommunicationAbility to Learn QuicklyTeam Collaboration

Tools & Technologies

WiresharkObservability ToolingIncident ResponseOn-Call

Industry Keywords

Production Backend ServicesContainerized DeploymentsScalabilityPerformanceReliabilityFault Tolerance

Tech Stack

Tools & technologies

AWSDNSJavaScriptKubernetesMongoDBNode.jsRedisTCP/IP

About the role

Key responsibilities & impact

Take end-to-end ownership of services and features in production
Develop features from design and implementation through production rollout and ongoing improvements
Build and maintain high-scale backend services emphasizing performance, reliability, and security
Participate in system design and architecture planning
Address networking challenges involving traffic flows, proxy behavior, request/response handling, and protocol-level edge cases
Investigate and troubleshoot complex networking issues using Wireshark and similar packet inspection/debugging tools
Write high-quality, maintainable code with appropriate test coverage
Participate actively in code reviews
Collaborate with engineers and stakeholders to deliver solutions
Continuously learn and apply backend engineering and networking best practices

Requirements

What you’ll need

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 I/O vs CPU-bound workloads, async patterns, blocking pitfalls, and 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
Proficiency in system design fundamentals: 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 have: experience with AWS and SaaS environments
Nice to have: experience debugging production networking issues, including latency, packet loss, connection reuse, and TLS handshakes
Nice to have: experience with observability tooling and incident response/on-call