Senior JavaScript / Prebid Engineer (Web AdTech) - OPS00066

🟢 At [Dev.Pro](http://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](https://drive.google.com/file/d/1HtZZ5S5bQGUkP9ndK4RalcKg5mPSGXgp/view?usp=sharing) [💻 LinkedIn Page](https://www.linkedin.com/company/2340834/) [📈 Our website](https://dev.pro/company/) [💻IG Page](https://www.instagram.com/devpro.global/)