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Lead engineer - javascript

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Wingify

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IT - Software Development

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Job Description:

As a Lead JavaScript Engineer, you will be required to work on various JavaScript libraries that are served on our customers’ websites thereby impacting millions of users. These libraries are the core of all the features of VWO. We love vanilla JavaScript and work with cutting-edge technologies like TypeScript, Rollup.js, Cypress, and ESLint. We are obsessed with Web Performance.

Job Responsibility:

  • Develop and maintain core JavaScript libraries used across our products
  • Own the architecture, development, and maintenance of our core JavaScript libraries
  • Build reusable, modular code to be shared across various JavaScript projects
  • Review code, mentor peers, and set coding standards and best practices for the team
  • Collaborate with Product and Engineering teams to implement features that deliver real value to customers
  • Lead efforts to optimize for speed, size, and reliability
  • Write thorough unit and integration tests to ensure cross-browser compatibility and regression-free deployments
  • Contribute to the open-source community by sharing insights, writing blog posts, and participating in discussions about the technologies we use

Requirements:

  • 5–8 years of experience in JavaScript development
  • At least 1–2 years in a lead or senior role
  • Deep expertise in Vanilla JavaScript, with a strong grasp of the browser environment, DOM, and JavaScript APIs
  • Solid experience with TypeScript, HTML, and CSS
  • Comfort with using AI tools to boost productivity and code quality
  • Proficiency in build tools and workflows like Rollup.js, ESLint, and modern JavaScript bundling strategies
  • Passion for web performance and a deep understanding of how browsers work under the hood
  • Strong debugging skills and experience with automated testing frameworks (we use Cypress)
  • Experience writing cross-browser compatible code, including support for older browsers where needed
  • Familiarity with advanced JavaScript concepts: Promises, async/await, modularity, data binding, etc.
  • A continuous learner who stays up to date with the latest trends and best practices in front-end development
What we offer:
  • You’ll work on high-impact products used by global brands and millions of users
  • You’ll be part of a passionate team that truly cares about code quality, performance, and developer experience
  • We foster a transparent, performance-oriented culture with plenty of room for learning and experimentation

Additional Information:

Job Posted:
January 02, 2026

Employment Type:
Fulltime
Work Type:
Remote work
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