Senior Software Engineer

About the role

Every HackerRank assessment runs on a foundation of high-performance systems - from the Coderunner service that powers millions of code executions daily to the unified IDE where developers write, test, and showcase their skills.

As a Senior Full-Stack Engineer, you’ll help shape these core systems, working across the stack to build fast, reliable, and AI-enhanced tools used by developers and hiring teams around the world.

What you’ll do

• Build and ship frontend features using React/Next.js, seamlessly integrating them with backend services
• Ensure the reliability and scalability of services that process tens of millions of code runs every month
• Improve the performance, accessibility, and usability of our IDE across platforms
• Embed LLMs and AI agents into both UI flows and public APIs to enhance developer experience
• Own the full feature lifecycle  from design and testing to monitoring and incident resolution

Who you are

• You bring a strong balance of frontend craft and backend depth, with 3–6 years building production-ready applications end-to-end. 
• Comfortable working with React/Next.js and TypeScript, and fluent in at least one backend language like Go, Node, Python, or Java.
• Experienced in designing and scaling microservices for high-traffic systems, with strong command over both SQL and NoSQL databases - including modeling, indexing, and tuning for performance.
• You naturally leverage AI-powered developer tools like Copilot, Cursor, or Claude to move faster and deliver better code, and you communicate clearly through design docs, API contracts, and post-mortems.

Even better if you have

• Hands-on experience with Docker, Kubernetes, and deploying services on AWS, GCP, or Azure.
• A strong observability mindset, using logs, metrics, and traces as second nature.
• Practical wins with tools like Prometheus, Grafana, Datadog, or New Relic.

You will thrive in this role if

• You enjoy owning the entire flow- from Figma mockups to APIs, tests, and post-launch metrics. 
• You chase measurable wins like faster response times, improved accessibility, and fewer errors. 
• You mentor through example, lifting your team through pairing and thoughtful feedback. 
• And above all, you care about impact at scale, helping millions of developers showcase their best work isn’t abstract to you, it’s rewarding.