Architecting high-performance full-stack applications with scale in mind.
Sabbir Mahmud — Leading technical strategy for end-to-end distributed systems. Crafting seamless user experiences backed by robust, sub-100ms latency infrastructure.
Professional Trajectory
Engineering excellence through iterative growth.
Full-Stack Engineer (Next.js / TypeScript)
- Architected a multi-repo educational platform composed of Next.js 16 (App Router) client portals, Next.js administrative dashboards, an Expo-powered React Native mobile application (Expo Router & Reanimated), and a Node.js/TypeScript Express API backend.
- Designed and implemented a scalable database schema using MongoDB and Mongoose ODM, integrating Connect-Mongo session storage, JWT auth security, and custom middleware handlers.
- Engineered a high-throughput question engine on the mobile app leveraging Shopify Flash-List for virtualized list performance and MathJax/WebView wrappers to dynamically typeset complex math equations.
- Developed a modular, multi-step exam builder using React Hook Form, Redux Toolkit, and Radix UI dialogs, supported by a backend compilation pipeline utilizing PDFKit and Puppeteer to generate high-fidelity PDF exam prints.
- Integrated Jodit React WYSIWYG editors and KaTeX math typesetting inside the moderator dashboards, enabling administrators to easily draft, categorize, and audit curriculum-aligned question sheets.
Backend Developer (Python, Django)
Full Stack Web Developer (Python || JavaScript)
Ecosystem & Capabilities
Architectural foundations for high-performance and containerized scaling.
Scripting, Celery task automation, background execution
Interactive web pages and dynamic frontend controls
Type-safe client & server business logic architectures
Robust MVC structures and secure backend logic
High-performance asynchronous REST API development
Non-blocking event-driven API runtime engines
Minimalist server routing and middleware configuration
Interactive user interfaces and component state control
SEO-optimized apps & React Server Components
Cross-platform mobile applications for iOS & Android
Containerized deployment and microservices isolation
Reverse proxy, load balancing, and SSL configuration
Relational database schema and transaction controls
Document-based high-throughput NoSQL data structures
Bidirectional sub-100ms real-time event messaging
OS configuration, bash scripting, & remote host control
Distributed hosting, EC2, S3, and VPC networks
Version control, collaborative branches, and git-flow
Automated deployment pipelines and testing integrations
Designing secure, self-documenting OpenAPI endpoints
Operational Performance
Real-world engineering metrics achieved across production systems.
Consistent year-over-year expansion driven by system reliability
High-availability active-passive clustering and failover systems
Production-ready enterprise integrations active on AWS hosting
Optimal query caching, CDNs, and database tuning benchmarks
Backend Orchestration & Real-Time Sync
Database Architecture & Rendering
Selected Projects & Libraries
Open-source packages and enterprise architectures built for performance and integration.
ISP Billing System
An enterprise billing and management automation system for Internet Service Providers. Integrates with Mikrotik API for bandwidth and radius profiles control, coupled with PayPal, Stripe, and SSLCommerz payment gateways. Manages invoice triggers, automated ledger entries, and features a collaborative user client portal.
- Mikrotik Radius Server Profile Integration
- Automated payment billing & gateway reconciliation
- Real-time bandwidth usage & connection tracking logs
BDPayments
A centralized payment gateway abstraction layer for Stripe, SSLCommerz, bKash, and Nagad. It offers a single, unified API interface for charge, refund, and retrieve operations across multiple providers with lazy-loaded adapters.
BDDeliveries
A centralized delivery gateway abstraction wrapper for Bangladeshi couriers including Pathao, Steadfast, and Paperfly. It provides a unified API for order creation, tracking, and cancellations with dynamic runtime loading.
Express Controller Sets
Designed for Node.js/Express.js developers to minimize boilerplate route controls. Create a schema model, instantiate the controller set, and link routes. Supports validation via Mongoose, express-controller-sets-router, and S3 file uploading.
Python Advanced Invoice Generator
Automated document utility designed to compile high-fidelity PDF invoices. Renders dynamic schema data using Jinja2 templates into HTML, compiled into target PDF prints via Pdfkit and the wkhtmltopdf compilation engine.
Let's build something exceptional.
Currently available for architectural consulting, contract engagements, and senior engineering roles.