What can I Do
Well, I am a Full Stack Developer
My experience has been quite varied throughout my coding journey. Take a look at any one of them. (Or just scroll)
Kumar Saptam
Well, I am a Full Stack Developer
My experience has been quite varied throughout my coding journey. Take a look at any one of them. (Or just scroll)
6 Years Experience
46 Production Projects
4 Years Experience
12 Production Projects
4 Active Deployments
2 Production Projects
3 Years Experience
From multi-tenant SaaS platforms to end-to-end encrypted messaging systems, here are some key projects I've architected and built.
Complete multi-tenant e-commerce SaaS with 800+ API endpoints, drag-and-drop website builder, and real-time order processing. Handles 5000 concurrent clients per store with worker pools processing 50 orders/batch. Deployed with Postgres, Redis, Meilisearch, and full monitoring stack.
High-performance multi-platform billing system processing 600 bills/second. Real-time cross-device sync using WebSockets and Memcache with automatic state recovery.
Biometric payment authentication system with USB fingerprint reader integration. Secure E2E encrypted channel for transactions with NGRX state management.
Microservices social platform with end-to-end encrypted messaging using Signal Protocol. Reimplemented PQXD3H protocol from scratch and verified in CryptoVerif.
E-Commerce platform for home services with real-time provider matching, service tracking, and payment processing. Built with mobile-first approach using NGRX.
On-demand laundry service with pickup/delivery scheduling and dynamic pricing based on garment type and service.
Custom jewellery e-commerce with dynamic pricing algorithm based on weight, carat, and dimensions. Virtual try-on capabilities.
Warehouse inventory system with intelligent sorting algorithms and automated retrieval based on FIFO/LIFO strategies.
My professional journey across innovative companies, from payment solutions to e-commerce platforms.
2025 - 2026
Senior Full Stack Developer
Led the development of scalable e-commerce platform architecture, implementing real-time inventory management and payment processing systems.
2024 - 2025
Full Stack Developer
Developed and maintained web applications with focus on user experience and performance optimization.
2022 - 2023
Software Developer
Built custom software solutions for clients, focusing on backend development and API design.
2020 - 2022
Junior Developer
Started my professional journey developing innovative solutions and learning modern web technologies.
Technologies and tools I work with, organized by experience level.
This is the short version (Ya this is short).
I am a systems-focused Full Stack Engineer with 6+ years of experience building secure, scalable products in startup environments. My expertise spans distributed systems, encryption, and performance engineering.
I have implemented the Signal protocol from scratch, including post-quantum extensions, and built revenue-critical payment systems with redundant transactional safeguards. I engineered a custom ESC/POS printing utility that reduced billing latency from seconds to near-instant by operating below typical OS bottlenecks.
I have led a seven-person team, hired and mentored engineers, and worked directly with CEOs to shape product direction. I have pushed back against insecure decisions and owned production outages under real-world pressure.
I prioritize correctness first, maintainability second, and performance third. My goal is to ship systems that remain reliable under scale, evolving requirements, and operational stress.
You can hit me up on any social media below or just send me a mail.