Portfolio
NGO portal systems, departmental software, AI/computer vision projects, open-source utilities, and visual designs built using modern full-stack web architectures.
Official Web Portal, CMS & Management System
A complete digital transformation ecosystem for Unnayan Sahayak Sangstha solely developed by Sajjad, including an official NGO website, CMS portal, admin system, SEO infrastructure, media management, and cloud-based content workflow.
Departmental Portal & Student Information Systems
Contributed to the official web systems of the Department of ICT, Islamic University, including the departmental website, Silver Jubilee registration system, student portal support, admin workflows, and institutional digital services.
Interactive Cryptography Learning Platform
An interactive cryptography learning platform that converts Python-based cryptography lab experiments into a modern full-stack web application with Next.js frontend and FastAPI backend.
Computer Vision QR Scanner & Generator
A full-stack QR code generation, decoding, and real-time webcam scanning system combining frontend development, backend API development, OpenCV-based image processing, and deployment.
Query-Aware RAG · Multi-Model LLM Failover · Structured Portfolio AI
A production portfolio AI assistant built with Next.js App Router, TypeScript, and a multi-provider LLM cascade across Google Gemini and Groq with query-aware domain routing and zero hallucination.
Brand Identity, Typography & Media Portfolio
A long-term creative archive of graphic design and digital content works from 2019 to present, including posters, banners, event designs, social media graphics, academic visuals, diagrams, branding-style materials, and promotional content.
Chapter & Conference Portal Ecosystem
Contributed to the official website, executive committee portal, conference websites, digital branding, codebase organization, and Web & IT Committee mentorship for IEEE Computer Society Bangladesh Chapter.
Full-Stack Dynamic Notice Board
A full-stack notice management application with public notice viewing, admin login, protected create-update-delete operations, MongoDB integration, backend API routes, and responsive UI.
Context-Aware Conversational AI
A Python-based command-line AI chatbot backend integrating Gemini API, chat history, memory summary, fallback handling, environment variables, and modular backend structure.
Schedule & Daily Spiritual Progress App
A district-based Ramadan calendar web application for Bangladesh featuring interactive district selection, Sehri and Iftar timing, searchable dropdown, live countdown, Hijri and Bangla dates, responsive UI, and PWA support.
Speed Typing Benchmark for Developers
A specialized programming typing practice web application that enables developers to practice typing real syntax with character-by-character validation across 5 languages (C, Python, SQL, HTML, JavaScript).
Interactive Event Invitation & Schedule
A modern reusable digital invitation card template with animated envelope, responsive invitation layout, live countdown, venue details, sharing option, and custom logo support.
Medical Portal & Patient Management System
A healthcare-focused frontend website built with HTML, CSS, JavaScript, Bootstrap, Google Fonts, and Font Awesome as an EDGE IUICT course final project.
Terminal-Based Speed & Accuracy Tool
A command-line interface application that measures typing speed and accuracy using C++ programming logic.
Academic Archive
Coursework-based laboratory repositories, implementations of engineering lab experiments, and structured university study project archives from Islamic University, Bangladesh.
A coursework-based laboratory repository containing classical and modern cryptography experiments, algorithm implementations, and reports related to cryptography and network security.
A laboratory repository containing computer graphics algorithms, drawing techniques, transformations, and visualization-related programming exercises.
A laboratory repository containing system analysis exercises, software engineering documentation, system design work, and practical software development activities.
A laboratory repository focused on digital signal processing, image processing, and related computational techniques. This academic background also supported the development of the QR Vision SS project.
A coursework repository containing practical implementations and reports related to information coding, source coding, channel coding, and transmission systems.
An operating systems laboratory repository containing implementations related to processes, scheduling, synchronization, memory management, and system-level programming.
A laboratory repository focused on computer architecture, computer organization, instruction processing, memory systems, and system-level concepts.
An optical communications laboratory repository containing simulations and practical exercises related to optical fibers, transmission, attenuation, dispersion, and optical communication systems.
A data communication laboratory repository containing simulations and exercises related to digital communication, data transmission, encoding, modulation, and communication channels.
A laboratory repository containing simulations and practical exercises related to electronic communication, microwave engineering, modulation, signal behavior, and communication systems.
A laboratory repository containing simulations and practical work related to electromagnetic theory, antenna characteristics, radiation patterns, and communication concepts.
A communication systems laboratory repository containing simulations related to analog and digital communication, modulation, demodulation, and signal transmission.
A database management systems laboratory repository containing database design, SQL operations, relational models, queries, and practical database exercises.
A statistics laboratory repository containing computational exercises related to probability, descriptive statistics, distributions, data analysis, and communication engineering applications.
A signals and systems laboratory repository containing MATLAB exercises related to signal generation, transformation, system analysis, convolution, and frequency-domain concepts.
An object-oriented programming laboratory repository containing C++ exercises related to classes, objects, inheritance, polymorphism, encapsulation, and abstraction.
A data structures and algorithms laboratory repository containing C++ implementations of fundamental data structures, searching, sorting, and algorithmic problem-solving techniques.
A numerical methods coursework repository containing C implementations of numerical computation, equation-solving, interpolation, and approximation techniques.
A foundational programming laboratory repository containing C programs covering structured programming, control flow, functions, arrays, pointers, and basic problem solving.