[Hiring] Senior Software Engineer @Freestar

Role Description

If you are a problem solver, have significant JavaScript experience, and you know what dynamic allocation is without having to look it up, this position is for you.

As a Senior Software Engineer at Freestar, you will be a subject-matter expert on Prebid and the header bidding ecosystem, instrumental in developing high-quality solutions that handle massive amounts of monetization opportunities for some of the world’s largest websites. This role is for someone that has experience in client-side monetization and scripting, has a significant amount of experience in the ad technology industry, and has in-depth knowledge of how the auction lifecycle works.

Located remotely and reporting directly to the Engineering Manager, you will play a pivotal role in our core projects. Your work will require deep programmatic advertising expertise, a high degree of autonomy, and a proactive approach to problem-solving that directly enhances the monetization capabilities of Freestar and its publishers.

This role is tailored for individuals who live and breathe ad tech and thrive in a dynamic, challenging environment. Your passion for the programmatic ecosystem and ability to navigate complex problems independently will drive our success and push the boundaries of what is possible.

Responsibilities

• Serve as a senior hands-on developer, writing and shipping production code daily, reviewing your peers' pull requests, and partnering with other engineers to ensure quality across the entire codebase.
• Act as a subject matter expert for Prebid.js and Prebid Server, providing insights on wrapper architecture, bid adapters, modules (identity, consent, floors, analytics), and more.
• Stay current on Prebid.js and Prebid Server releases, OpenRTB specification changes, and emerging standards in the header bidding ecosystem, translating those developments into concrete recommendations and upgrades for our platform.
• Own our header bidding wrapper end to end, including architecture and release cycle, evaluating and integrating new features, and making key design decisions.
• Work daily with Google Ad Manager, GPT, and the IMA SDK, leveraging deep knowledge of GAM's features and capabilities.
• Maintain a high quality standard of code for the client-side scripts that monetize publisher sites, ensuring JavaScript and TypeScript run efficiently at scale.
• Ensure on-page performance of client-side scripts, measuring and protecting Core Web Vitals — including INP, LCP, and CLS — along with memory usage, script execution time, and network overhead.
• Take ownership of deployed solutions, ensuring ongoing reliability and addressing critical issues as they arise to maintain system stability and performance.

Qualifications

• 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.

Benefits

• Freestar is an Equal Opportunity Employer.
• All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, protected veteran or disabled status, or genetic information.
• This role is not eligible for visa sponsorship.