Sandeep Kumar

Software Engineer with nearly 2 years of experience Backend-focused Full-Stack Engineer with a strong foundation in system design and end-to-end solution development. Proven track record of independently owning projects—from architecture to deployment while effectively managing teams and timelines. Known for solving complex technical challenges, quickly adapting to new technologies, and consistently driving high-impact outcomes across fast-paced environments.

Proficient in JavaScript, TypeScript, React.js, Node.js, Nest.js, MongoDB & AWS.

Software Engineer at QuestionPro Solutions Pvt. Ltd. (2024-04 – 2025-06)

• Reduced initial bundle size by 35% by introducing lazy loading and route-based code splitting, accelerating page rendering using Webpack Bundle Analyzer and Lighthouse.
• Migrated core data-fetching layer from REST to GraphQL with React Query, cutting network overhead and improving data retrieval speed by 40%.
• Built real-time update delivery for 10K+ concurrent users using WebSockets, achieving sub-second latency.
• Integrated Bull queues with Redis in a NestJS microservice, streamlining asynchronous job processing and eliminating backend bottlenecks.
• Implemented advanced Redis caching strategies, decreasing load times by 30% and improving overall application performance.
• Increased test coverage to over 70% across critical modules, reducing production bugs by 30% and improving deployment reliability.
• Streamlined the CI/CD pipeline with integrated test automation, accelerating release cycles and enabling real-time code-quality feedback.

Software Engineer at Instavans Logistics Pvt. Ltd. (2023-04 – 2023-10)

• Refactored a React codebase into a modular, reusable component library using TypeScript and Storybook, cutting development time considerably.
• Optimized Node.js APIs with advanced pagination and query tuning, improving back-end response times and efficiency.
• Integrated Leaflet and Mapbox APIs to reduce dependency on Google Maps, maintaining 99.99% uptime while lowering infrastructure costs.
• Applied MongoDB aggregation pipelines and indexing strategies, reducing API response times by 70%.
• Optimized inter-service communication using gRPC, reducing service latency by 88% and improving microservice reliability.

Software Development at Logipe Fintech Pvt. Ltd. (2022-05 – 2022-12)

• Built scalable web-scraping data pipelines using Puppeteer and jQuery, minimizing manual input and speeding up data processing.
• Developed SQS consumers to manage real-time toll transactions, ensuring database consistency at scale.
• Boosted SQL query performance by 65% through strategic indexing, query restructuring, and table partitioning.

Bachelor of Technology – Indian Institute of Technology, Roorkee (2018 – 2022)