Senior Software Engineer - Client Services

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. Key Skills Required 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. Important Mindset Difference 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/