I build scalable backend systems and polished web products for companies like ShareTrip, ChillyPOS, and HalalExplore - spanning flight booking engines, multi-tenant SaaS, e-commerce, and realtime platforms with React, Next.js, Node.js, NestJS, and cloud queues.
3+
Years of experience
400+
DSA problems solved
Specialized in backend-heavy, full-stack products across travel tech, SaaS, e-commerce, and realtime platforms.
End-to-end product delivery with React, Next.js, Node.js, and polished API contracts that teams can build on.
Scalable service architectures with NestJS, RabbitMQ, Redis, and PostgreSQL for high-throughput domains.
Multi-tenant backends with RBAC, subscription billing, BullMQ job queues, and real-time WebSocket flows.
Flight booking engines, halal travel APIs, idempotent bookings, vendor integrations, and queue-based reconciliation.
Worked With
A selection of full-stack applications, robust microservices, and AI-powered platforms I've engineered.
sharetrip.net
Travel Tech
End-to-end travel platform serving flights, hotels, and holiday packages with complex booking engines.
Impact: Production travel platform work across booking, post-booking, and airline integration flows.
chillypos.com
SaaS
Cloud-based Point of Sale and inventory management software designed for retail businesses with real-time syncing.
Impact: Multi-tenant backend and dashboard workflows for 100+ paying businesses.
halalexplore.com
Travel Tech
Halal-compliant travel ecosystem offering verified accommodations, transfers, and packages globally.
Impact: Backend APIs for hotel, cruise, transfer, insurance, and package booking workflows.
rashid-mamun.github.io/tech-interview-hub
Open Source
A comprehensive open-source guide and resource hub for technical interviews, covering backend, system design, and algorithms.
Impact: Public learning resource focused on backend, system design, database, and networking depth.
github.com/rashid-mamun/bdshop-server
Full Stack
Full-stack e-commerce system with a TypeScript client and scalable API for products, carts, orders, reviews, users, and stock workflows.
Impact: Full commerce API and client covering catalog, cart, order, review, and stock flows.
github.com/rashid-mamun/ride-hailing-microservices
Microservices
Microservices backend for ride booking with NestJS, PostgreSQL, RabbitMQ, Redis, Docker, and Swagger documentation.
Impact: Service-oriented ride workflow with brokered events, cache strategy, and documented APIs.
github.com/rashid-mamun/recruitAI
AI SaaS
AI-powered recruiting automation app with real-time SSE streaming, multi-tier AI fallback, and fault-tolerant candidate sourcing.
Impact: Fault-tolerant AI sourcing workflow with streaming UX and multi-tier provider fallback.
github.com/rashid-mamun/chat-app-backend
Full Stack
Full realtime chat system with React/Vite frontend and Socket.IO backend supporting private/group chats, file sharing, reactions, search, and 2FA.
Impact: Realtime messaging system with durable chat records, files, reactions, search, and 2FA.
github.com/rashid-mamun/halal-explorer-backend
Travel API
Backend for a halal-compliant travel platform covering hotels, cruises, transfers, insurance, and travel packages.
Impact: Travel backend surface covering verified halal inventory and authenticated API flows.
github.com/rashid-mamun/lets-form-a-team-nest-js
Auth/RBAC
Account type and role-based management system with granular permissions for super admin, manager, and employee flows.
Impact: Role and account-type management with granular permission boundaries.
sharetrip.net
Backend Arch
Architected the backend rewrite for flight void, refund, and reissue flows to handle complex airline ticketing rules.
Impact: Reduced operational complexity for flight void, refund, and reissue rule handling.
sharetrip.net
API Design
Designed backend API architecture for post-booking services, handling complex logic for dynamic seat selection and extra baggage.
Impact: Post-booking architecture for dynamic seats, baggage, and airline ancillary flows.
sharetrip.net
Backend Arch
Architected the backend engine for combo-flight search and booking, optimizing segment matching and dynamic pricing.
Impact: Search and booking engine work for segment matching and dynamic combo-flight pricing.
sharetrip.net
Cloud/AWS
Engineered a scalable flight logging system leveraging AWS S3 for file storage instead of traditional RDS, successfully reducing database costs by 30%.
Impact: S3-based flight logging approach that reduced database cost by 30%.
Practical notes on AI agents, backend systems, booking APIs, and full-stack product delivery.
Jun 2, 2026
14 min read
A practical operating model for using AI coding agents in production teams: precise scope, repository context, review gates, tests, and accountable handoff.
May 28, 2026
13 min read
The most effective AI product features are often quiet: extraction, ranking, drafting, validation, recommendations, and workflow automation embedded where users already work.
May 21, 2026
14 min read
AI-generated code can be productive, but it needs disciplined review for security, ownership, tests, performance, failure behavior, and long-term maintenance.
May 14, 2026
15 min read
A production-minded view of retrieval-augmented generation: chunking, permissions, freshness, citations, evaluation, and operational failure modes.
May 7, 2026
12 min read
Travel systems reveal why booking APIs need clear state models, idempotency, vendor timeouts, queues, reconciliation, and honest user-facing statuses.
Apr 29, 2026
12 min read
Maintainable SaaS backends depend on tenant boundaries, role-based permissions, billing workflows, background jobs, reporting, and careful operational design.
Engineering notes, project updates, and no spam.
Active on GitHub spanning full-stack commerce, microservices, AI tooling, realtime chat, and travel platforms.
An AI-powered recruiting automation app featuring real-time SSE streaming, multi-tier AI fallback, and fault-tolerant candidate sourcing.
Ride-hailing microservices backend with NestJS, PostgreSQL, RabbitMQ, Redis, Docker, and Swagger documentation.
Real-time chat application backend with private messaging, group chats, and file sharing.
A scalable RESTful API for an e-commerce platform, built with Node.js and MongoDB.
Halal-compliant travel platform for hotels, cruises, transfers, and packages.
Tech Interview Hub - Backend, System Design, Database, Networking, Docker, Node.js and NestJS interview notes