Open to opportunities

Thohanur User

@thohanuruser

Full-stack developer building secure, high-performance enterprise SaaS and CRM systems with React, Node, and scalable backend architecture.

Bangladesh

Message

What I'm looking for

I’m looking to build secure, scalable SaaS/CRM products where I can own backend architecture, optimize performance, and ship production-ready features—while collaborating in a team that values engineering quality, reliability, and continuous improvement.

I’m a Full-Stack Developer with 3+ years of experience building enterprise SaaS, CRM, and distributed systems used across 6+ countries. I’ve focused heavily on backend architecture, system design, and performance optimization—leading multi-tenant solutions with secure data isolation and scalable API systems.

In my recent roles, I implemented JWT authentication and RBAC for enterprise-grade security and improved critical endpoint request latency by ~120–250ms through performance tuning and database optimization. I also built production applications that improved backend efficiency by ~20–35% and delivered responsive frontend performance (FCP ~0.2s, LCP ~0.39s) using React.js, Next.js, and TypeScript—often as a team lead driving production-ready CRM and automation features.

Experience

Work history, roles, and key accomplishments

Current

Full-Stack Developer - Team Lead

Current

Backend Focused Mastery Corporation

Jun 2025 - Present (1 year 1 month)

Led backend development of a multi-tenant architecture for secure data isolation and scalable API systems. Implemented JWT authentication and RBAC for tenant-based access control, and tuned performance to reduce critical endpoint latency by ~120–250ms.

backend architecture System Design API Performance TypeScript JWT RBAC Secure Tenant Access Control Database Optimization Prisma Redis

Full-Stack Developer

Code Prophet

Aug 2024 - Jun 2025 (10 months)

Built and maintained scalable full-stack applications using React.js and Node.js for production users. Improved backend efficiency by ~20–35% via query optimization and structured API design, and developed REST APIs handling an estimated 10K–50K daily requests.

React Node.Js Development REST APIs Query Optimization API Design TypeScript

Full-Stack Developer (Frontend-Focused)

AhamedAiT

Oct 2023 - Jul 2024 (9 months)

Delivered responsive, high-performance frontend applications using React.js, Next.js, and TypeScript. Improved performance with rendering optimizations and code-splitting (FCP ~0.2s, LCP ~0.39s) and increased frontend performance score by ~25–40% using component optimization and lazy loading.

React Next.js TypeScript Performance Optimization Lazy Loading