JavaScript SDK Engineer

SDK Engineer for Browser API

About the Company:

AdPushup

About This Role:

This is a Senior JavaScript Engineer role with expertise in Vanilla JS. This is an Individual Contributor (IC) role.

JavaScript product

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

browser internals, JavaScript performance, and designing systems that scale