Job Description

🟢 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