About this opportunity
We are building a high-performance advertising platform that integrates directly into publisher websites via a lightweight JavaScript and React-based widget. Our system renders dynamic local classified listings post-page load and is powered by a custom header bidding stack built on Prebid.Js, fully deployed on Amazon Web Services.
We are looking for a Senior JavaScript Engineer with strong AdTech experience (or adjacent high-performance frontend systems) to help scale and optimize our bidding infrastructure and on-page rendering engine.
Key responsibilities and your contribution
* Architect and optimize a custom Prebid.Js-based header bidding stack
* Build and maintain high-performance JavaScript integrations running on publisher websites
* Improve latency, auction efficiency, and yield optimization across ad units
* Develop and enhance React-based widgets that render dynamic local listings
* Collaborate on bidder integrations, adapters, and demand partner connections
* Debug complex issues across browser environments, third-party scripts, and ad exchanges
Tech Stack
* JavaScript (ES6+), TypeScript (preferred)
* React (rendering layer for widgets)
* Prebid.Js / Header Bidding
* AWS (Lambda, CloudFront, S3, etc.)
* Real-time data flows, event-driven architectures
Is that you?
* 5+ years of JavaScript engineering experience
* Strong understanding of browser performance, async loading, and script execution
* Experience with AdTech ecosystems (Prebid, GAM, DSPs, SSPs) OR strong adjacent experience (high-scale JS, real-time systems)
* Familiarity with header bidding concepts (auctions, bid requests, latency tradeoffs)
* Experience debugging third-party script conflicts and optimizing page performance
* Ability to work in a fast-moving, product-driven environment
Nice to have
* Direct experience with Prebid.Js customization or bidder adapters
* Exposure to analytics, tracking, and attribution systems
What’s like?
* 30 paid days off each year — use them for vacation, holidays, or personal time
* 5 paid sick days, up to 60 days of medical leave, and 6 paid days off for family events like weddings, funerals, or having a baby
* Partially covered health insurance - after probation
* Wellness bonus for gym memberships, sports nutrition, and similar needs
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