Top Javascript Jobs in San Francisco Bay Area, CA

Develop and maintain high-scale JavaScript and TypeScript monetization solutions centered on Prebid.js, Prebid Server, and header bidding. Own wrapper architecture, integrate advertising technologies, monitor auction and ad-serving standards, optimize Core Web Vitals and client-side performance, review code, operate Google Cloud services, and resolve production issues. Serve as a subject-matter expert in programmatic advertising, Google Ad Manager, OpenRTB, identity, consent, and publisher monetization.

Build Java and JavaScript services that ingest public health IT data, monitor FHIR endpoints, validate resources, and create reproducible compliance evidence cases. Responsibilities include developing REST services, AWS/DynamoDB data models, deterministic validators, endpoint monitoring, scheduling, retries, rate limiting, audit logging, testing, and documentation. The role requires protecting against collection of patient data, PHI, credentials, and tokens while supporting replayable and human-reviewed validation workflows.

Build and maintain JavaScript/TypeScript integration layers connecting HubSpot with ERP, finance, marketing, and custom business systems. Develop HubSpot UI Extensions, App Cards, serverless integrations, workflows, webhooks, and API connections. Gather client requirements, present technical solutions, manage multiple integration projects, ensure code quality through testing and reviews, and contribute to SaaS product development and DevOps standards.

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.

Build and maintain scalable JavaScript applications, API integrations, and open-source projects for global clients. Responsibilities include writing and reviewing code, debugging across frontend, backend, database, and network layers, optimizing performance, designing scalable architectures, handling concurrency, documenting technical work, and addressing edge cases. The role is fully remote and includes structured technical growth, peer feedback, and an assessment process involving an OSS hackweek.

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.

Develop full-stack web features using JavaScript and CoffeeScript, focusing on modern web applications and open-source projects. Engineers contribute to the company’s open-source frameworks, including KD and Kite, while maintaining existing products and pushing new frameworks. The role requires deep JavaScript expertise and strong software engineering ability across front-end and back-end development.

Build, maintain, and promote a robust JavaScript/TypeScript client library and related front-end components. Integrate native libraries (N-API/node-addon-api/Wasm), develop responsive React apps, contribute to backend REST APIs (Python/Rust), manage CI/CD and npm publishing, document components with Storybook, and collaborate with design for production-ready components.

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.