I work close to the metal — debugging systems where a single NULL *pointer can take everything down. With hands-on experience in network software R&D, I build and optimize low-level systems across ACL, IEEE 802.1x, and AAA protocols — focusing on performance, reliability and how systems behave under real-world conditions.
{A little background on who I am and what drives me. }
I graduated from KUET in 2024 with a degree in Computer Science & Engineering. Over time, I’ve become particularly interested in how systems work beneath the surface — from networking protocols to backend architecture
When I'm not engineering software, I enjoy exploring new technologies, contributing to open source, and writing about what I learn.
"Current Role
R&D Engineer
Graduated
KUET, 2024
Location
Bangladesh
Status
Open to Opportunities
{Technologies and tools I work with. }
{Where I've worked and what I've built. }
CAREER_NETWORK
node://experience • uptime: active
PROTOCOLS://
END_OF_CHAIN • null route
{Hands-on R&D experience across networking protocols, security, and systems engineering. }
Auth · Authz · Accounting
Configured AAA framework on enterprise switches — centralized access control, session accounting, and privilege management.
Auth Server · Policy Engine
Deployed and managed RADIUS/TACACS+ servers for network device authentication, integrating with switch AAA configurations.
Traffic Filtering · ACL
Designed and implemented standard and extended IP access-lists for traffic filtering and network security policies.
Monitoring · OID Tree
Used MiB browsers to traverse SNMP OID trees, poll device metrics, and configure traps for network monitoring.
7-Layer Stack · Mapping
Deep practical understanding of OSI layers — applied daily in troubleshooting, protocol design, and switch configuration.
4-Layer · Encapsulation
Hands-on experience with TCP/IP — packet inspection, encapsulation flows, and protocol interaction at each layer.
Routing · VLAN · Inter-VLAN
Configured L3 switches for inter-VLAN routing, static routes, and integration with enterprise network topologies.
EAP · Supplicant · RADIUS
Implemented IEEE 802.1X port-based network access control using EAP, integrating with RADIUS backend authentication.
UDP · RFC 1350 · Transfer
Designed and worked with TFTP for firmware upgrades and config backup across network devices — UDP-based simplicity.
Standards · Interoperability
Studied and implemented RFC specifications in R&D — translating IETF standards into working protocol features.
{Internationally recognized publications and academic research contributions. }
Md. Shanjid Arefin, Sadman Sakib, Muhammad Sheikh Sadi
2024 13th International Conference on Electrical and Computer Engineering (ICECE)
Visual impairments have emerged as a prevalent issue over recent decades. The daily lives of visually impaired individuals are full of challenges, leading to a significant dependence on others for assistance with everyday tasks. Though various systems have been developed to aid the visually impaired in their day-to-day life, many of these are constrained by their specific domains. In this paper, we have taken a comprehensive approach to develop a solution aimed at enhancing the mobility and reading capabilities of the visually impaired. The solution is provided by developing an embedded spectacle glass with realtime obstacle avoidance, fall detection, and textual information extraction modules. The system generates an audible alert upon detecting obstacles ahead. In the event of an accident, the fall detection module sends an emergency response to a designated caregiver. The optical character recognition (OCR) module includes various image preprocessing techniques, an OCR engine, and a text-to-speech converter. In the optical character recognition module, the overall character error rate (CER) and word error rate (WER) are 6.97% and 9.46% respectively. The paper provides a comprehensive solution for the visually impaired by developing a portable, wearable, lightweight, and low-cost spectacle by which they can get assistance to detect obstacles around them and get textual information easily.
1
Publication
IEEE
Publisher
2024
Latest
{Things I've built — from research tools to web applications. }
An academic thesis and project on Smart Eye-wear device. A thesis of smartware device which has modules of i. Fall Detection, ii. Object Distance Detection iii. Image to Text Conversion and feeding the output to the bluetooth speaker.
Project on Computer Graphics featuring controllable dynamic aeroplanes, lighiting and texturing etc.
A full-stack web platform designed for internal team collaboration within a LAN environment. Built with Flask and SQLAlchemy, the system allows users to post technical problems, share solutions, and interact via comments, likes, and notifications. Implemented IP-based identity mapping, username validation flows, and a scalable notification system supporting future features like post following and tag subscriptions.
CLI project for a Switch device to act as a tftp server. It implements the protocol according to the RFC 1350 specification, allowing clients to upload and download files. The server handles multiple concurrent requests, manages file storage, and provides error handling for various scenarios such as file not found or access violations.
A scalable React app for learning Japanese vocabulary — audio pronunciation, example sentences, Wikipedia images, flashcards, and quizzes. Still growing with new features like spaced repetition
Built with Next.js and Tailwind CSS, this portfolio website is designed to showcase my projects, experience, and skills. It features a clean, responsive design with sections for about, skills, experience, projects, education, coding profiles, and achievements. The site also includes SEO optimizations and is deployed on Vercel for fast performance.
{My educational background and achievements }
B.Sc. (Engg.) in Computer Science & Engineering
CGPA: 3.42 / 4.00
Relevant coursework: Data Structures, Algorithms, Computer Networks, Computer Graphics, OS...
Science (HSC)
CGPA: 5.00 / 5.00
Completed Higher Secondary Certificate with a focus on science subjects.
{Competitive programming and problem solving across platforms. }
Platforms
HackerRank Solved
Codeforces Solved
Total (excl. LC)
{Certifications and milestones I'm proud of. }
4
Total Achievements
2
Major Certifications
2
Platform Certificates
Ranked 2nd in Bangladesh in the ITEE FE Exam
Passed the FE Computer Engineering exam — a nationally recognized engineering certification. Physical certificate pending collection.
Certified in basic-level problem solving covering data structures and algorithms.
{Thoughts on engineering, systems, and tech. }
A deep dive into UTF-8 — how variable-length encoding works, why string.length lies to you, what surrogate pairs are, and why truncating a string at a byte boundary can silently corrupt data. Includes an interactive encoder to step through any character bit by bit.
An interactive deep-dive into how your OS decides which Network Interface Card — and which router — to use when you browse the internet.
A beginner-friendly guide to understanding how C handles errors using errno, strerror(), and perror(). Learn how to detect, interpret, and debug file-related errors effectively instead of letting your program fail silently.
{Have a project in mind or just want to connect? I'd love to hear from you. }
Job opportunities, collaborations, or just a technical deep-dive — reach out any time.
Location
Dhaka, Bangladesh