Senior Software Engineer - Frontend

Company Overview:

About VWO

VWO is a leading Digital Experience Optimization platform trusted by over 3,000 businesses in 100+ countries, including global brands like Samsung, Vodafone, Toyota, HBO, and Domino's. What began 15 years ago as one of the world’s first A/B testing tools has since evolved into a comprehensive, enterprise-grade platform used by product, marketing, and growth teams to experiment, personalize, analyze behavior, and build exceptional digital experiences.

Today, VWO offers a full-stack suite for A/B testing, multivariate testing, feature rollouts, heatmaps, session recordings, behavioural analytics, surveys, personalization, and more across web, mobile, and server-side applications — all in one unified platform. We enable teams to make confident, data-driven decisions that drive user engagement, retention, and conversion.

VWO is a profitable, founder-led business with $50M+ ARR, strong EBITDA margins, and a history of capital-efficient, sustainable growth. In January 2025, Everstone Capital acquired a majority stake in the company to help accelerate our global expansion — both organically and inorganically.

We are a fully remote team of 450+ people, with go-to-market teams across the Americas, Europe, and APAC, and product and engineering anchored in India. Our culture values deep thinking, fast execution, and strong ownership — with minimal bureaucracy and high autonomy. Despite our scale, we continue to operate with the agility and ambition of a startup.

As a senior front-end engineer, you will be required to work on our application, the front-end of our customer-facing web application, and the JavaScript library that is installed on our customers' websites. We work iteratively and ship code often, and are looking for people who can work hand in hand with our back-end team. The solutions that you build will be deployed on thousands of websites, thereby impacting millions of users.

Tools that we use

All our engineers at Wingify are involved in every part of our development life cycle. As an engineer at Wingify, you will be responsible for creating, monitoring, managing, and improving our product that is used by over 5000+ customers across 90+ countries. We love vanilla Javascript and use many libraries and tools like AngularJS, TypeScript, jQuery, SASS, Grunt, Git, Jenkins, Jasmine, QUnit, Testswarm, BrowserStack, Selenium to name a few.

Job Responsibilities:

• Development of our application's front-end and our public websites.
• Participating in the design and implementation of new features.
• Evolving the architecture of our front-end.
• Talking about your work - we love open source software, we heavily use them and by talking about how we use them is the least we can do to help the community. See our engineering blog.

Skills & Experience:

• 3+ years of experience in developing front-end applications at scale.
• Strong knowledge and experience in HTML, CSS, and JavaScript.
• Understanding of the DOM, canvas rendering, and SVG.
• Deep understanding of how the browser works.
• Understanding of browser caching
• Experience in writing modular/reusable code and using JS frameworks.
• Experience with frameworks like Ember, Angular, Backbone.js, etc., especially about their internal working.
• Knowledge of high-level programming concepts like promises, data-binding.
• Experience with seamless integration of front-end to backend functionality.
• Track record of building great interfaces with the user experience in mind.
• Regard for optimizations that focus to deliver content to the user as quickly as possible.
• Good understanding of the constantly evolving world of front-end development.
• Understanding the similarities and differences across browsers (young and old).
• Understanding of different measurement and benchmarking tools.
• Experience with test-driven/behavior-driven development using automated testing tools.
• Experience in working in agile software development environments
• A latent love for writing beautiful and modular CSS, along with some experience with frameworks like Bootstrap, Foundation, etc is a plus.
• Experience with advanced CSS programming using LESS, SASS, or Atomic CSS is a plus.