Top Senior Javascript Jobs in San Francisco Bay Area, CA

Senior Backend JavaScript Developer role based in San Francisco. The posting provides no substantive details about responsibilities or requirements.

Build end-to-end features in a JS/TS stack, designing scalable backend services and responsive real-time frontends. Improve observability, performance, and reliability, collaborate with product/design, and own full-stack implementation from APIs and data models to UI.

Develop and maintain high-scale JavaScript and TypeScript monetization solutions for publisher websites. Own Freestar’s Prebid.js and Prebid Server header-bidding wrapper, including architecture, adapters, modules, releases, and performance. Integrate with Google Ad Manager, GPT, IMA SDK, and programmatic advertising systems. Monitor Core Web Vitals, reliability, and network performance while reviewing code, resolving critical issues, and guiding technical decisions.

Build and maintain full-stack applications that deliver AI/ML insights through backend services, REST APIs, containerized microservices, and high-performance front-end interfaces. Responsibilities include cloud-native development on Google Cloud or Azure, database management, testing, CI/CD automation, security, troubleshooting, and Agile collaboration.

Lead full-stack development using Next.js and NestJS, build Node.js backend services with PostgreSQL, implement real-time messaging, apply prompt engineering and model training, develop embeddings/chunking and RAG features, write TypeScript code, mentor juniors, and participate in code reviews.

The role involves leading the development of a high-performance Web SDK for fraud detection and risk management, implementing algorithms for device fingerprinting, and ensuring security and performance optimization.

The Senior Full Stack JavaScript Developer will build and maintain user interfaces using React and Next.js, integrate with Node.js backends, and guide other developers. Responsibilities include ensuring accessibility, performance, and reliability of features, engaging in code reviews, and collaborating closely with product teams.

Take end-to-end ownership of high-scale backend services powering networking infrastructure. Design, implement, and operate performant, reliable, and secure Node.js services; troubleshoot complex networking issues; participate in architecture, testing, and incident response; collaborate with engineers and stakeholders to deliver scalable solutions.