Backend Engineer, HackerRank

• Backend engineer with 2+ years of experience in server-side software development
• Proficient in at least one modern backend programming language (e.g., Python, Ruby, Go, Java, or Node.js)
• Deep understanding of API design principles (REST, GraphQL) and web standards
• Strong experience with relational databases (PostgreSQL, MySQL) and familiarity with NoSQL stores
• Knowledge of distributed systems, caching mechanisms (Redis/Memcached), and asynchronous messaging (Kafka/RabbitMQ)
• Familiarity with containerization (Docker) and basic CI/CD workflows
• Comfortable using AI-powered coding assistants (e.g., GitHub Copilot, Cursor, Claude Code) as a daily part of your development workflow
• Working familiarity with large language models — you understand what they can and can't do, and can write effective prompts to get useful outputs
• Experience using AI tools beyond code generation — for planning, writing documentation, drafting test cases, debugging, and code review
• Basic understanding of AI/ML fundamentals: how LLMs work at a high level (tokens, context windows, inference), common model architectures, and the difference between fine-tuning, RAG, and prompt engineering
• You stay current with the rapidly evolving AI tooling landscape and are eager to adopt tools that meaningfully improve your productivity

Desirable

• Every day, millions of developers use HackerRank to prove their skills
• We’re looking for a Backend Software Development Engineer who thrives on solving complex architectural problems and delivering high-impact product features
• You will be responsible for the server-side logic, database architecture, and the integration of front-end elements
• Your work will ensure that our core application remains fast, reliable, and scalable as we continue to grow our global user base
• Design, build, and maintain efficient, reusable, and reliable backend code to support new product features and enhancements
• Develop and integrate RESTful or GraphQL APIs to serve front-end applications and external clients
• Design and optimize database schemas (SQL and NoSQL) to ensure data integrity and query performance at scale
• Collaborate with frontend developers, product managers, and designers to translate requirements into robust technical solutions
• Troubleshoot production issues, identify bottlenecks, and drive performance optimizations across the application stack
• Write comprehensive unit and integration tests to ensure high code quality and system stability