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Lifesight - Senior Frontend Engineer - React.js

Posted on: 13/12/2025

Job Description

About us :


Lifesight is a fast-growing SaaS company focused on helping businesses leverage data & AI to improve customer acquisition and retention.

We have a team of 130 serving 300+ customers across 5 offices in the US, Singapore, India, Australia, and the UK.

Our mission is to make it easy for non-technical marketers to leverage advanced data activation and marketing measurement tools that are powered by AI, to improve their performance and achieve their KPIs.

Our product is being adopted rapidly globally and we need the best people onboard the team to accelerate our growth.

Key Responsibilities :

- Own end-to-end feature development, from ideation to production release.

- Write clean, maintainable, and well-documented code that adheres to best coding practices.

- Work closely with backend developers, designers, and product managers to deliver an exceptional user experience.

- Investigate and resolve performance bottlenecks, browser compatibility issues, and other critical frontend challenges to ensure optimal user experience.

- Ensure best practices for infrastructure management related to frontend applications, including build pipelines, CI/CD, caching strategies, and asset management.

- Implement responsive and accessible designs with a keen eye for UX/UI consistency.

- Engage with the latest technology and industry UI trends to continually evolve and improve the application experience.

What we are looking for :

- Expertise in frontend performance optimization, including debugging tools, Lighthouse audits, caching strategies, and lazy loading techniques.

- Deep understanding of browser behavior, performance bottlenecks, and compatibility challenges.

- Hands-on experience in advanced CSS and responsive design techniques.

- Experience working with Git for version control and managing large-scale frontend projects.

- Familiarity with modern frontend build tools (Webpack, Babel, Vite, or similar).

- Ability to troubleshoot and debug complex production issues efficiently.

- Owned the improvement of various frontend performance metrics at scale.

- Built or contributed to Design Systems, Component or Util Libraries.

- Worked on micro-frontend architecture, distributed frontend systems.

Experience :

- 5 - 8 years Proficient in JavaScript (ES5+), DOM manipulation, event handling, TypeScript, ReactJS, HTML, CSS, and testing frameworks.

Heres what you can expect :

- Early impact - Help shape the tech stack and build products from the ground up.

- Agile culture - Small teams, zero bureaucracy.

- Great benefits - Competitive pay, health insurance, daily breakfast, weekday lunches, Friday team lunch, Fun OClock Fridays, and unlimited coffee, tea & snacks


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