Sr. Java Script/Sdk Engineer

JavaScript/SDK Engineer About the Company: AdPushup is an award-winning ad revenue optimization platform and a Google Certified Publishing Partner (GCPP), helping hundreds of web publishers grow their revenue using cutting-edge technology, premium demand partnerships, and proven ad ops expertise. Our team is a mix of engineers, marketers, product evangelists, and customer success specialists, united by a common goal of helping publishers succeed. We have a work culture that values expertise, ownership, and a collaborative spirit. About This Role: This is a Senior JavaScript Engineer role with expertise in Vanilla JS. This is an Individual Contributor (IC) role. Unlike typical UI-focused frontend positions, this role centers around engineering our core JavaScript product - a high-performance script that runs on customer websites . You will work at the intersection of browser internals, web performance, and backend services, designing systems that handle billions of impressions per month. Your Day-to-Day Responsibilities: Own the design and development of our client-side JavaScript engine that optimizes ad delivery and layout in real-time Collaborate closely with Product, Revenue, and Ad Ops teams to identify and build new revenue-driving features Participate in LLD (Low-Level Design) and HLD (High-Level Design) discussions for frontend and backend initiatives Perform code reviews and drive engineering best practices Help troubleshoot and resolve production issues across browser and server environments Mentor junior engineers and guide them on technical architecture and performance tuning Contribute to improving our development processes, automation, and observability Support project management efforts and ensure high-quality, timely delivery of initiatives You Should Have: 6 - 10 years of experience in frontend-focused product engineering, with strong contributions to production systems Mastery of JavaScript , especially vanilla JS and modern browser APIs (closures, prototypal inheritance, DOM manipulation, event loop, async patterns) Expertise in designing resilient, high-performance client-side code (not just UI components) Experience with Node.Js and Express.Js, comfortable working on backend APIs when needed Proficiency with TypeScript and modern ES6+ JavaScript practices Deep understanding of web security , HTTP protocols, and cross-browser compatibility challenges Solid knowledge of system design principles, including scalability and performance trade-offs Familiarity with code versioning tools (Git/SVN) and modern CI/CD workflows Bonus: Exposure to Java, Docker, ReactJS, SQL Server, or NoSQL databases Why Should You Join AdPushup? At AdPushup, you’ll: Work on technically challenging problems where your code runs directly on thousands of live websites, impacting real revenue Be part of a fast-moving product company where engineering decisions matter and are felt immediately Grow into a Staff Engineer role as you demonstrate ownership and technical leadership Enjoy a culture that values transparency, autonomy, and learning Collaborate with talented peers who appreciate clean, high-quality engineering Get flexibility to work from home—we care about results, not just hours Have access to catered lunches, plenty of snacks, and a supportive environment Experience direct, honest communication across the company Next Steps If you’re passionate about browser internals, JavaScript performance, and designing systems that scale , we’d love to hear from you. This is an opportunity to own the technical direction of our core product, while fast-tracking your career growth.