I build production-grade backend systems and full-stack applications that handle real traffic, real payments, and real-time interactions. My work spans multi-vendor marketplaces, on-demand service platforms, UK tradesperson lead engines, and web apps — all deployed on cloud infrastructure with proper CI/CD pipelines.

Core focus areas:

• Backend Architecture — Scalable REST APIs, microservices patterns, background job queues (BullMQ), caching layers (Redis), and full-text search (Elasticsearch)
• Payment Engineering — Stripe Connect split payouts & escrow, Google Play / App Store in-app subscription verification, PayPal, SSLCommerz, Hubtel
• Real-time Systems — WebSocket clusters with Socket.io, live video streaming with Agora, real-time bidding engines
• Cloud & DevOps — AWS deployments, Docker containerization, Terraform IaC, automated CI/CD
• AI Integration — OpenAI & Gemini API integration, Agentic AI workflows for intelligent automation

A UK-focused leads marketplace connecting homeowners with local trade professionals (plumbers, electricians, roofers). Built lead distribution engine, automated matching algorithms, Stripe payment processing, and admin analytics dashboard.

TypeScript Node.js Express MongoDB Mongoose Redis Stripe Socket.io Next.js Twilio

A cross-platform mobile marketplace connecting customers with verified professional service providers. Engineered the complete backend API, server-side subscription validation handlers for Google Play (RTDN) & Apple StoreKit 2, multi-party escrow payouts via Stripe Connect, and real-time chat with Socket.io.

TypeScript Node.js Express MongoDB Socket.io Stripe Connect In-App Purchases Redis

A comprehensive multi-vendor platform digitizing retail, hospitality, and service bookings in Ghana. Engineered distributed backend with Redis caching, multi-party escrow transactions and automated vendor withdrawals integrated with Hubtel gateway, and asynchronous background worker queues with BullMQ.

TypeScript Node.js Express MongoDB Redis BullMQ Socket.io Hubtel Gateway Cloudflare R2 AWS

Full-stack eCommerce platform with role-based admin/customer dashboards, SSLCommerz payment integration, and responsive storefront.

React Redux Express MongoDB Shadcn UI SSLCommerz

Languages
Backend
Frontend
Databases
Payments
Cloud & DevOps
AI
Tools

Open to opportunities — let's build something that scales.
abdussalamsuhag104@gmail.com · LinkedIn · Portfolio