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Senior JavaScript Engineer(AdTech) at MGID. Location Information: Poland. 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.. 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!