Top Senior Javascript Jobs in Los Angeles, 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 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 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.

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.