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Senior JavaScript / Prebid Engineer (Web AdTech) - OPS00066 at Dev.Pro. 🟢 At . Dev.Pro. , we work on projects that impact millions of people around the world — but we know it’s the people behind the tech who make it all happen. We truly value what makes each person unique and are building a workplace that’s inclusive, friendly, and supportive.. 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 working at Dev.Pro 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 . Our next steps:. ✅ Submit a CV in English — ✅ Intro call with a Recruiter — ✅ Internal interview — ✅ Client interview — ✅ Offer. Interested? Find out more:. 📋How we work. 💻 LinkedIn Page. 📈 Our website . 💻IG Page . Company Location: Brazil.