Junayed Hassan
Building scalable, production-grade web applications for global clients.
Professional Profile
Architecting High-Performance Web Systems & APIs
I'm a Full Stack Web Developer from Dhaka, Bangladesh with a deep passion for backend architecture and scalable system design.
At Optilius, I architected Toolffy — a large-scale developer community platform — from scratch, with 20+ independent backend modules.
I offer global services in English, Bengali & Arabic, targeting clients in Bangladesh, the Middle East, and Europe.
Ready to build something extraordinary together?
Engineered for Global Scaling
Choose a proven service package or build a tailored custom service with your preferred stack and live client tracking.
Full Stack Web Development
End-to-end web applications from database design to polished frontend — production-ready, scalable, and secure.
- NestJS / Express REST API Design
- PostgreSQL + Prisma / MongoDB + Mongoose
- Next.js App Router + TypeScript Frontend
- Docker + Nginx Deployment
- Cloudinary Media Management
Backend API Engineering
Scalable, secure REST API architecture with enterprise-level auth, real-time features, and production-grade deployment.
- JWT + RBAC + OTP + 2FA Auth Systems
- Social OAuth (Google, GitHub, LinkedIn, Apple)
- Socket.io Real-time Systems
- Redis Caching & Performance
- Modular Architecture (20+ modules)
Frontend Engineering & UI/UX
Pixel-perfect, ultra-responsive Web Applications with world-class animations, accessibility, and high conversion design.
- Next.js 15 App Router + React 19
- TailwindCSS + Custom Design Systems
- Framer Motion Micro-interactions
- WCAG 2.1 AA Accessibility Standards
- Lighthouse 95+ Core Web Vitals
AI Integration & Automation
Integrate LLMs, Gemini, OpenAI, Claude, AI Agents, embeddings, vector databases, and automated workflows.
- Gemini & OpenAI API Integration
- RAG Systems with Vector Databases (Pinecone, pgvector)
- Automated Business Workflow Bots
- Document Analysis & NLP Pipelines
- Function Calling & Tool Use Agents
DevOps & Cloud Architecture
Robust cloud infrastructure, automated CI/CD pipelines, Dockerization, monitoring, and high-availability setups.
- Docker & Docker Compose Containerization
- Nginx Reverse Proxy & SSL Automation
- GitHub Actions CI/CD Pipelines
- VPS, AWS EC2, DigitalOcean Deployment
- Automated DB Backups & Health Monitoring
Technical Architecture & Code Audit
Deep-dive architectural review, security vulnerability assessment, database query optimization, and scalability roadmaps.
- Architecture & Scalability Audit
- Database Query & Index Optimization
- Security Assessment & Vulnerability Fixes
- Refactoring Legacy Codebases
- Technical Roadmapping & Tech Stack Advisory
How I Work
My Process
Discovery
Understand goals, target market & technical requirements
Architecture
Design scalable system structure, DB schema & API contracts
Development
Iterative builds with clean code, PR reviews & weekly updates
Delivery
Docker deploy, Nginx config, CI/CD pipeline & documentation
Let’s Build Something Great
Available for freelance projects, remote engineering & scalable web systems globally.
Projects That Ship to Production
Real-world applications built for real users — from high-throughput backend APIs to polished full-stack platforms.
More on GitHub
Explore open-source repositories, experiments, and architectural starter kits.
Experience, Skills & Education
A comprehensive overview of my professional journey, technical expertise, education, and recognitions.
Junior MERN Stack Web Developer
Optilius · Mohammadpur, Dhaka
Architecting Toolffy — a large-scale developer community & product launch platform from scratch using Node.js, Express 5, TypeScript, and PostgreSQL with raw SQL migrations structured into 20+ independent modules.
- ▸Production-grade auth: JWT, OTP, 2FA, failed login protection, social OAuth via Passport.js (6 providers)
- ▸Integrated Google Gemini AI & OpenAI for smart recommendations; Redis for caching; Socket.io for real-time features
- ▸Configured Dockerized deployment with Nginx reverse proxy and full CI/CD pipeline
- ▸Developing 100+ React.js + TypeScript components — analytics dashboard, deals marketplace, maker dashboard
MERN Stack Web Developer (Intern)
Optilius · Mohammadpur, Dhaka
Built a full-stack portfolio & CMS platform for the company's Founder — REST APIs for blog (CRUD, SEO, Cloudinary), portfolio, timeline, and certifications.
- ▸Implemented auth with Clerk + JWT + RBAC; developed real-time admin notifications via Socket.io
- ▸Integrated Nodemailer and Jodit rich text editor with full SEO meta/OG tag support
→ Promoted to Junior Developer after 6 months — Oct 2025
Thoughts on Code & Craft
Deep dives, tutorials, and real-world lessons from building production applications.
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Client Feedback & Reviews
What founders, product managers, and engineering leaders say about working with me.
“Junayed built our entire retail e-commerce platform with Arabic RTL support in NestJS and Next.js. Exceptional engineering speed, transparent communication, and rock-solid code.”
“Outstanding NestJS architecture! The automated Swagger documentation, role-based access control, and Docker pipeline made deployment to our cloud servers effortless.”
“Very professional developer. Delivered our inventory API ahead of schedule with zero bugs. Highly recommend for any serious full-stack or backend projects!”
Let’s Build Something Together
Available for freelance, remote contracts & full-time roles globally. Response within 24 hours.
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