ABU SAYED AL SIAM
I'm a Full Stack Developer who loves building beautiful and high-performing web applications. I focus on real-world problem solving, payment systems, automation, and scalable products. I have experience as a Team Lead and Scrum Leader.
Skills & Technologies
My technical toolkit spans modern web development. Hover over each skill to learn why I use it.
JavaScript (ES6+)
React.js
Next.js
TypeScript
Tailwind CSS
HTML/CSS
Node.js
Express.js
MongoDB
PostgreSQL
MySQL
Prisma ORM
REST APIs
Git & GitHub
Firebase
Vercel
Figma
JWT Authentication
SEO
Featured Projects
Real-world applications showcasing problem-solving, system design, and engineering excellence.
ZiNi Pay
FinTechSecure Payment Automation Platform
⚠️ Problem
Manual payment verification is time-consuming, error-prone, and leads to duplicate transactions. Businesses lose revenue due to processing delays and human errors.
💡 Solution
Built an automated payment verification system that cross-references personal numbers with payment gateway data, implements duplicate prevention with Redis caching, and provides real-time transaction validation.
✅ Result
✅ 95% faster payment processing ✅ Zero duplicate payments ✅ 99.9% uptime ✅ Reduced manual verification workload by 100%
🔒 Security
- ✓AES-256 encryption for sensitive data
- ✓JWT-based authentication
- ✓Rate limiting (5 req/min per IP)
- ✓Audit logging for all transactions
- ✓Secure API endpoints with HTTPS
⚡ Performance
- ✓99.9% uptime SLA
- ✓Sub-500ms response time
- ✓Handles 1000+ concurrent users
- ✓Optimized database queries with indexing
SMM Pro BD
SaaSMulti-Provider SMM Reseller Platform
⚠️ Problem
Managing multiple SMM service providers manually is inefficient. Resellers need a centralized platform to handle orders, track status, and manage inventory across different APIs.
💡 Solution
Developed a multi-provider aggregation layer that integrates with 5+ SMM APIs, provides real-time order tracking, automatic price sync, and intelligent provider selection based on availability and pricing.
✅ Result
✅ 10x order capacity increase ✅ Real-time status synchronization ✅ 40% cost reduction via smart provider selection ✅ Automated refunds and error handling
🔒 Security
- ✓API key encryption
- ✓Role-based access control
- ✓Secure webhook handling
- ✓Input sanitization
⚡ Performance
- ✓Processes 500+ orders simultaneously
- ✓Provider health monitoring
- ✓Automatic retry logic
- ✓Optimized database queries
System Design Showcase
How ZiNi Pay handles payment verification with security, scalability, and reliability
Payment Initiation
User submits payment with personal number
- ✓Frontend validation with real-time feedback
- ✓Loading state with progress indicator
- ✓Secure HTTPS/TLS request to backend API
Verification Layer
Cross-reference and validate transaction
- ✓Personal number lookup in payment gateway
- ✓Transaction ID validation and verification
- ✓Amount cross-check for accuracy
Duplicate Prevention
Ensure transaction uniqueness
- ✓Redis cache check for recent transactions
- ✓Database uniqueness constraint validation
- ✓SHA-256 hashing for transaction IDs
Security Measures
Multi-layer security enforcement
- ✓Rate limiting: 5 requests per minute per IP
- ✓JWT token verification and validation
- ✓AES-256 encryption for sensitive data
- ✓Comprehensive audit logging
Confirmation Flow
Real-time notification delivery
- ✓WebSocket push notification to client
- ✓Email/SMS confirmation sent
- ✓Dashboard update with transaction details
Work Experience
Building products, leading teams, and delivering impact
Full Stack Developer
Sudoflux
Remote
January 2026 - Present
Responsibilities:
- •Working on real-world web applications with modern tech stack
- •Building scalable frontend and backend systems using React.js and Node.js
- •Collaborating with team members using agile methodologies and sprint planning
- •Implementing responsive UI components and RESTful API endpoints
- •Participating in code reviews and maintaining high code quality standards
Impact:
- ✓Delivering production-ready features on tight deadlines
- ✓Improving application performance and user experience
- ✓Contributing to team knowledge sharing and best practices
Full Stack Developer
Zini IT
Remote
May 2024 - September 2025
Responsibilities:
- •Working on real-world web applications with modern tech stack
- •Building scalable frontend and backend systems using React.js and Node.js
- •Collaborating with team members using agile methodologies and sprint planning
- •Implementing responsive UI components and RESTful API endpoints
- •Participating in code reviews and maintaining high code quality standards
Impact:
- ✓Delivering production-ready features on tight deadlines
- ✓Improving application performance and user experience
- ✓Contributing to team knowledge sharing and best practices
Junior Software Developer
Qweek AI
Remote
January 2023 - April 2024
Responsibilities:
- •Led sprint planning and daily standups as Scrum Leader
- •Developed and maintained React.js frontend features
- •Integrated third-party APIs for data synchronization
- •Collaborated with backend team on API design
- •Conducted code reviews and mentored junior developers
Impact:
- ✓Reduced deployment time by 40% with CI/CD pipeline implementation
- ✓Improved code quality by establishing team coding standards
- ✓Increased feature delivery velocity by 30% through agile practices
React JS Developer
TheGoodGameTheory
Remote
November 2023 - February 2024
Responsibilities:
- •Built reusable React component library from Figma designs
- •Implemented responsive layouts for web and mobile
- •Optimized application performance and loading times
- •Participated in daily code reviews and team meetings
Impact:
- ✓Created 15+ production-ready reusable components
- ✓Reduced development time for new features by 30%
- ✓Achieved 95+ Lighthouse performance score
How I Think as a Developer
Principles and philosophy that guide my engineering decisions
I don't just build features—I solve problems. Every line of code I write is a decision: Is this readable? Is this secure? Will this scale? I approach development like product design: understanding the user, planning the system, and iterating based on feedback.
📝Code Philosophy
- →Write code that humans read, not just machines
- →Optimize for maintainability, then performance
- →Test critical paths, automate repetitive tasks
- →Document decisions, not implementations
🎯Engineering Principles
- ✦Ship fast, iterate faster
- ✦Security is not optional
- ✦User experience drives technical decisions
- ✦Scalability from day one
📊GitHub Statistics
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Get in Touch
Have a project in mind? Let's discuss how we can work together
Send a Message
Usually responds within 24 hours
Contact Information
Joypurhat, Bangladesh