Himanshu Saini

I’m a full-stack JavaScript developer focused on building scalable, production-ready web applications with strong backend foundations. I specialize in React/Next.js on the frontend and Node.js ecosystems on the backend, with hands-on experience designing transactional workflows, implementing idempotent APIs, and optimizing high-concurrency systems using MongoDB and Redis. I enjoy working on architecture as much as implementation — thinking through data consistency, performance trade-offs, and deployment strategy. I’ve built containerized applications deployed on AWS using Docker and Kubernetes, and I value clean structure, predictable state management, and robust testing practices that make systems reliable under real-world load. Currently, I’m focused on deepening my backend expertise while building end-to-end systems that balance performance, scalability, and maintainability. I’m particularly interested in product-driven teams where engineering decisions directly impact business outcomes.

Architected feature-scoped Redux Toolkit slices with normalized state for attendance and payroll modules—eliminated cross-module state leakage during route transitions and enforced predictable state updates across complex workflows. Optimized large employee roster rendering in React using memoized selectors and windowed list virtualization—reduced memory consumption by ~30% while handling 500+ concurrent records and minimizing reconciliation overhead. Built an internal AI assistant interface using TypeScript and WebRTC-based streaming—achieved sub-300ms real-time interactions through direct server streaming integration and efficient incremental UI updates. Designed RESTful APIs in Node.js/Express with PostgreSQL-backed transactional logic—ensured atomic attendance and payroll updates under concurrent operations using service-layer abstraction and database-level constraints. Implemented comprehensive testing using Jest and React Testing Library for frontend components, along with Supertest-based API integration testing to validate endpoint behavior and ensure functional correctness across core application workflows. Containerized services with Docker and deployed to AWS EC2 instances—implemented GitHub Actions–driven CI/CD pipelines with automated linting, unit, and integration testing. Collaborated in Agile sprints with cross-functional teams—decomposed complex features into iterative deliverables, enabling parallel frontend/backend development and shipping the attendance module 2 weeks ahead of roadmap.

I recently completed my specialization in Software Engineering from Scaler Academy, where I strengthened my foundations across core computer science and system design domains. I significantly improved my Data Structures and Algorithms skills, focusing on problem-solving, complexity analysis, and writing optimized, scalable code. I deepened my SQL knowledge, working with indexing, query optimization, joins, and transaction management. Additionally, I gained hands-on experience in Low-Level Design (LLD) by designing modular, maintainable components using OOP principles, and High-Level Design (HLD) by architecting scalable, distributed systems with considerations for caching, consistency, reliability, and performance trade-offs in real-world applications.