The Role
Build and customize frontend solutions using Vanilla JavaScript, jQuery, HTML, and CSS. Debug complex client-side issues, manipulate the DOM, handle events, analyze Fetch/XHR requests, use MutationObservers, and modify live websites safely. Ensure cross-browser compatibility, responsive behavior, performance, and resilience to dynamic updates while collaborating cross-functionally on client scenarios and experiments.
Summary Generated by Built In
We are looking for a Senior Software Engineer who is comfortable working with Vanilla JavaScript, HTML, and CSS to build and customize frontend solutions, debug complex client-side issues using browser developer tools, and handle DOM manipulation, event handling, and dynamic UI updates. Should be confident analyzing APIs through Fetch/XHR requests, tracking DOM changes using MutationObserver and browser console techniques, and making real-time UI modifications using inspect element and custom scripts. The role also requires troubleshooting frontend issues across browsers and collaborating with cross-functional teams to solve real-world client scenarios while ensuring smooth and optimized user experiences.
Key Responsibilities:
Examples of Tasks You Will Perform- Rearranging elements on a page dynamically.
- Creating new UI blocks using JavaScript, jQuery and CSS.
- Overriding existing styles safely.
- Preventing interference from existing scripts and styles.
- Ensuring compatibility across devices and screen sizes.
- Making changes that survive dynamic DOM updates.
- Tracking user interactions for experiments.
- Strong understanding of Vanilla JavaScript, jQuery, HTML and CSS.
- Advanced DOM traversal and manipulation.
- Event handling and debugging in live environments.
- Using MutationObservers for dynamic content.
- Handling Single Page Applications (SPAs).
- Writing safe and conflict-free CSS.
- Understanding browser behaviour and edge cases.
- Performance-safe scripting on production websites.
This role is highly problem-solving oriented. There is no clean HTML, no reusable components, and often no documentation. You must analyse the DOM like a detective and figure out how to safely manipulate it in real-time.
Who Will Enjoy This Role- Developers who love JavaScript, jQuery and CSS deeply.
- Those who enjoy solving DOM challenges.
- People are comfortable working without access to source code.
- Developers who like debugging tricky real-world issues.
We don’t build websites — we intelligently manipulate the DOM using Vanilla JavaScript, jQuery and CSS to run experiments on live websites.
At Wingify, we are committed to building a diverse, equitable, and inclusive workplace. We believe that a variety of perspectives drives better ideas, stronger execution, and more meaningful impact. Read more about our policy here: https://wingify.com/careers/equal-opportunity-policy/
Skills Required
- Strong understanding of Vanilla JavaScript, jQuery, HTML, and CSS
- Advanced DOM traversal and manipulation
- Event handling and debugging in live environments
- Experience using MutationObservers for dynamic content
- Experience handling Single Page Applications
- Ability to write safe and conflict-free CSS
- Understanding of browser behavior and edge cases
- Ability to write performance-safe scripts for production websites
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The Company
What We Do
Wingify, doing business as VWO, is an India-based software company that develops technology products for digital experience optimization. Its VWO platform helps fast-growing companies run experimentation and conversion programs, enabling them to build extraordinary digital experiences and improve performance. The company delivers these capabilities through a single platform for websites and digital products, with a remote-first operating model.
