Frontend Engineer II

About the role

Every day, millions of developers use HackerRank to prove their skills. Behind the scenes, our Integrity team makes sure those assessments are fair, secure, and trusted.

As a Frontend Engineer II, you ll craft experiences that protect trust and stay ahead of evolving AI-driven challenges, balancing security, usability, and speed at scale.

This is a role where the details matter; one pixel off, one interaction too clunky, and trust erodes. You ll design experiences that feel invisible when they work- simple, intuitive, and resilient.

What you ll do

• Build fast, responsive UIs that scale to 100K+ concurrent users.


• Create intuitive workflows for candidates, interviewers, and hiring teams where security feels effortless.


• Develop modular components that power integrity features across multiple HackerRank products.


• Leverage real-time signals to detect anomalies while keeping the candidate experience seamless.


• Collaborate with design, product, and backend teams to ship quickly and iterate often.

Who you are

• A frontend engineer who enjoys solving complex UI challenges with clean, thoughtful code.


• Brings 2 4 years of experience building modern web apps using React (or similar) with solid JavaScript fundamentals.


• Skilled in crafting accessible, responsive interfaces with React + Typescript, modern state management & modern tooling.


• Confident in debugging deeply and optimizing performance across browsers and devices.


• Curious about emerging AI-powered tools and comfortable integrating them into your workflow.

Even better if you have

• Hands-on experience with front-end security patterns like XSS, CSRF, and sandboxing.


• Built for global audiences - handling localization, RTL layouts, and accessibility edge cases.


• Integrated GraphQL or REST APIs, with TypeScript as part of your workflow.


• Used AI or LLM tools to automate dev workflows or boost code quality.

You will thrive in this role if

• You care about the intersection of security, usability, and scale, and know great UX is a technical challenge.


• Product thinking comes naturally: you question the why, sweat the details, and build with users in mind.


• Curious about AI and already exploring how to integrate it into your tools, features, or workflow.