Reazul Islam Reaz — backend-focused full-stack engineer 🇧🇩 @ Sparktech Agency. I ship SaaS end-to-end: disciplined APIs, thoughtful persistence, thin frontends.

Systems-minded — boundaries, trade-offs, growth paths before code ships. Scale & performance by default: indexing, caching, query shape, rate limits, operability under load.

AI (RAG, LangChain) with validation, fallbacks & guardrails. Payments & reliability — modular services, API boundaries, RBAC, JWT & Firebase Google Sign-In (web & Flutter).

Portfolio → reazul-islam-reaz.vercel.app

const reaz = {
  pronouns: "He/Him",
  role: "Backend-focused full-stack @ Sparktech Agency 🇧🇩",
  askMeAbout: [
    "Scalable API-first SaaS (REST & GraphQL)",
    "System design, RBAC & multi-tenant guardrails",
    "Stripe webhooks & idempotent payments",
    "Socket.io / WebRTC (ZEGOCLOUD) real-time",
    "Clean AI integration (RAG, LangChain)",
  ],
  coreStack: [
    "TypeScript", "Node.js", "Express.js", "NestJS", "Go",
    "PostgreSQL", "MongoDB", "Redis",
    "React", "Next.js", "Tailwind CSS",
  ],
  alsoUse: [
    "Prisma", "Mongoose", "Zod", "JWT", "Firebase Auth",
    "Docker", "Nginx", "AWS (EC2/S3/IAM)", "GitHub Actions",
  ],
  currentFocus: "API-first backends — safe payments, real-time & responsible AI",
  learning: ["Go & advanced NestJS", "Microservices & system design", "Advanced distributed architecture"],
  education: "BSS (Honors) Political Science — National University, Bangladesh",
};

🎯 What I do (portfolio):

• Modular services & API boundaries (REST / GraphQL)
• Relational & document schemas (PostgreSQL, MongoDB, Prisma, Mongoose)
• Auth, RBAC & rate-sensitive flows (JWT, Firebase Google Sign-In)
• Stripe idempotent payments & webhook hardening
• Socket.io / WebRTC real-time (ZEGOCLOUD, QR workflows)
• Docker, Nginx, AWS & CI/CD (EC2, S3, DigitalOcean)
• AI tooling responsibly (Cursor, Claude, RAG) — not a substitute for tests or API review
• Full delivery across API, data & client (React, Next.js)

Production-grade full-stack apparel e-commerce platform — Next.js 16 storefront, role-gated admin console, and NestJS 11 REST API backed by PostgreSQL 17 (Prisma 7), Redis 7, and BullMQ worker queues.

• Stack & Architecture: Next.js 16 (App Router), React 19, NestJS 11, TypeScript, Tailwind CSS 4, PostgreSQL 17, Prisma 7, Redis 7, BullMQ, Redux Toolkit, TanStack Query, Docker.
• Storefront & Catalog: Server-side faceted search, dynamic product variant matrix, real-time stock verification, optimistic Redux cart management, and streamlined checkout workflows.
• Role-Gated Admin Console: Dedicated /admin suite (ADMIN / SUPER_ADMIN) with inventory tracking, low-stock alerts, order lifecycle state machines, customer CRM, and CSV/XLSX export generators.
• Background Jobs & Message Queues: BullMQ workers for transactional outbox relays, automated cart recovery, reservation expiry timers, and asynchronous data processing.
• Security & Performance: JWT auth with rotating HTTP-only refresh cookies, granular RBAC guards, Prisma compound indexing, selective projection queries, and Docker multi-stage containerization.

Production-style event management platform in Go — microservices, system design, and performance-focused architecture. User, Event, and Ticket services each own a PostgreSQL database and communicate via gRPC; a GraphQL gateway handles JWT auth, booking flows, paginated search, metrics, and rate limiting. Built to demonstrate scalable backend engineering with Docker Compose orchestration.

🛠 Currently Working On:

• 🏗 J&K Cabinetry CT – Wholesale cabinetry platform in production: Next.js customer site, React admin dashboard, TypeScript Express API, MongoDB, AWS S3, Stripe, and Socket.IO messaging (dashboard · API docs).

• 💬 Connectify – Real-time social platform with chat, feed, friends, S3 media, and ZEGOCLOUD calls (Next.js frontend + Node.js/Socket.io backend).

• 🎟 Confaero – Enterprise conference & event management SaaS (10 roles: Super Admin, Organizer, Speaker, Volunteer, Exhibitor, Attendee, Abstract Reviewer, Sponsor, Staff, Track Chair). Backend: TypeScript, Express 5, MongoDB, Socket.io, Stripe, ZegoCloud WebRTC, QR check-in, Firebase Google Sign-In (POST /api/v1/auth/google) for web & Flutter (Play Store / App Store), Swagger API docs, AWS S3, node-cron.

• 🤖 Replii.ca (Twvinfast) – AI-powered email SaaS with smart replies, automation, and scalable email workflows.

• 🌐 TrueCrimeConsultants – Lawyer website with CMS-style backend and communication features...

📚 Learning Now:

• Backend scalability, Go service patterns & clean architecture
• Microservices — service boundaries, inter-service communication, and deployment patterns
• System design — scalability, reliability, and production architecture trade-offs
• Advanced architecture — API gateways, event-driven systems, caching, and distributed patterns

• Email: reazul.dev@gmail.com
• WhatsApp: +8801770807782
• Location: Dhaka, Bangladesh (Remote Available)
• Portfolio: reazul-islam-reaz.vercel.app