Senior Software Engineer, Javascript – Ad Tech Experience Required
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Job Description
Senior Software Engineer building and optimizing Prebid header-bidding systems for Freestar’s website monetization platform. Maintaining high-scale JavaScript/TypeScript scripts and publisher ad performance.
Responsibilities:
- Serve as a senior hands-on developer, writing and shipping production code daily, reviewing peers' pull requests, and partnering with engineers to ensure codebase quality
- Serve as a subject matter expert for Prebid.js and Prebid Server, including wrapper architecture, bid adapters, identity, consent, floors, and analytics modules
- Track Prebid.js and Prebid Server releases, OpenRTB specification changes, and emerging header bidding standards, translating them into platform recommendations and upgrades
- Own the header bidding wrapper end to end, including architecture, release cycle, feature integration, and design decisions
- Work daily with Google Ad Manager, GPT, and the IMA SDK, including line item architecture, key-value targeting, unified auction dynamics, and Unified Pricing Rules
- Maintain high-quality JavaScript and TypeScript client-side scripts monetizing publisher sites at scale
- Measure and protect Core Web Vitals, including INP, LCP, and CLS, as well as memory usage, execution time, and network overhead
- Own deployed solutions, ensuring reliability and addressing critical issues to maintain system stability and performance
Requirements:
- Deep, hands-on expertise with Prebid.js — wrapper configuration, bid adapters, modules (identity, consent, floors, analytics)
- In depth knowledge of the auction lifecycle
- Experience with Prebid Server — stored requests, server-side adapter configuration, s2s routing, and more
- Strong working knowledge of Google Ad Manager, including GPT, line item architecture, key-value targeting, unified pricing rules, dynamic allocation, and more
- 4+ years of experience in JavaScript development, with substantial TypeScript experience
- Experience with Google Cloud Platform (e.g., GKE, Cloud Run, Pub/Sub, BigQuery) for deploying and operating high-throughput services
- Broad ad tech fluency: OpenRTB, SSP/DSP integrations, identity solutions and EIDs, consent frameworks (TCF/GPP), Amazon TAM/APS, video (IMA SDK/VAST)
- Strong experience with asynchronous programming and understanding of client-server architecture
- Strong problem-solving skills and ability to work in a distributed team environment
- Excellent technical documentation and communication skills
- Ability to be creative and contribute based on your merit
- This role is not eligible for visa sponsorship
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