🟢 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
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What We Do
Dev.Pro helps innovative technology companies scale their business by leveraging our software engineering expertise to support them every step of the way. It was founded by entrepreneurs and technologists, with the goal of helping technology-driven companies to develop their innovative software products and grow their businesses. We started as an American company in 2011 and now have offices in different locations. Part of our development centers are located in Ukraine and we support Ukrainian specialists by providing them with career opportunities around the world. Also over the past few years, we have been hiring specialists from very different countries and continue to do so, expanding and globalizing the company. True to our roots, we remain creative and nimble, tailoring our engagement with clients to meet their specific needs. Some come to us for our engineering expertise, some for the rapid delivery, and some for cost efficiency. But what truly sets us apart is the alliance we forge with our clients over time, aligning our success with theirs.
