Senior JavaScript Engineer(AdTech)

Job Description

Are you passionate about modern frontend development and curious about the inner workings of digital advertising? We’re looking for a

Senior JavaScript Engineer to join our dynamic team and take a key role in building and optimizing our in-house Header Bidding and ML-powered yield-management stack for publishers.

This is more than a traditional engineering role — we’re launching a new strategic direction in digital marketing, and we’re looking for someone who’s not only technically strong but also naturally investigative. You’ll lead data-driven experiments, explore new concepts, and help shape the next generation of AdTech solutions based on your findings.

What you will do:

• Set up a lightweight and efficient Prebid.js integration (under 30 KB) with support for 5 major ad bidders like Magnite and OpenX.
• Build a high-performing sticky ad widget that refreshes smartly — only when the ad stays visible for at least 30 seconds and has 60%+ viewability.
• Implement out-stream video ads (ads that play outside of a video player) using VideoJS and Google’s IMA SDK for seamless ad playback.
• Configure and manage Google Ad Manager, including setting up line items, sending MCM (Multiple Customer Management) invites, and using automation scripts to streamline tasks.
• Integrate a Consent Management Platform (CMP) to comply with privacy regulations, and develop a tool to validate ads.txt files, ensuring authorized ad inventory.
• Create data views in BigQuery using SQL to analyze key monetization metrics like eCPM and Invalid Traffic (IVT), applying logic such as percentiles for deeper insights.

Requirements

Who you are:

• Senior-level experience with JavaScript/TypeScript (ES6+, Webpack or Vite, DOM performance)
• Solid understanding of HTTP, browser DevTools, and CORS
• Proven experience building production-ready widgets or SPAs
• Strong analytical and problem-solving skills
• English B2+: able to read technical documentation and write clear tickets
• Quick learner, comfortable navigating complex systems

We're building smart solutions for a fast-moving industry — and we want curious, driven engineers like you on board. Apply today!