👋 I'm Sajjad Hossain — a full-stack product engineer based in Dhaka, working worldwide.

Five years in software. The last three spent closer to the parts people rarely see — building software for workflows that carry users, money, records, operations, and business rules.

I started with web apps, servers, and data-heavy workflows in 2021 at KHALID IT, where every small decision had a visible effect. From 2022 to 2024 at Sellbee, I built SaaS merchant commerce systems (BeeCommerce for 5K+ merchants with Stripe and aamarPay) and AR product flows (RealX).

Currently at ELO, I work across AI audio tools (Jamahook serving 30K+ users), pharmacy supply chains (Pharmacon handling 7K+ contracts), and hospital management platforms (BMU Hospital supporting 14K+ patients).

I work through the full loop: understand the product, design the data, shape the API, build the interface, test the risky paths, and ship with production constraints in mind. The mandate is simple: turn messy operations into software that keeps moving.

Work

• ELO

  2024–Present

  Full Stack Engineer2024–Present
  AI · Desktop App · Healthcare · Supply Chain
• Sellbee

  2022–2024

  Full Stack Developer2022–2024
  Commerce · SaaS · Payments
• KHALID IT

  2021–2022

  Junior Web Developer2021–2022
  Web Apps · Data · Deployment

Beliefs

• 01Stay close to the workflow.
• 02Understand the audience before the interface.
• 03AI is infrastructure, not decoration. Build systems that keep moving without you.

Execution Layer

• Backend architectureNode.js · NestJS · REST · JWT · RBAC
  APIs, auth, RBAC, service boundaries, validations, database logic, and business rules.
• Frontend product flowsReact · Next.js · TypeScript · UI Flows
  Dashboards, storefronts, admin panels, onboarding, checkout, and merchant-facing interfaces.
• Performance workOptimization · Refactor · Workers · Async Tasks
  Query tuning, module cleanup, background processing, async tasks, and heavy workflow optimization.
• Production deliveryDocker · Linux · Nginx · CI/CD
  Docker, Linux servers, Nginx, CI/CD habits, backups, and deployment-ready releases.