Md Rajib Hasan

Software Engineer

Backend Architecture & Network Infrastructure

Building scalable backend systems, AI pipelines, and secure VPN/network infrastructure — from RESTful APIs to Linux networking across global cloud nodes.

Download CV Get in touch

Dhaka, Bangladesh · hasan.rajib1996@gmail.com

About

Backend systems, AI pipelines, and secure networks

Software Engineer specializing in backend architecture and network infrastructure, with a strong academic background in Computer Science (CGPA 3.89/4.00) and practical experience in API development, AI deployment, and network security.

Hands-on work includes configuring Linux network architectures, VPN tunneling protocols (WireGuard, IPsec, OpenVPN), firewall policies, and automated cloud infrastructure — alongside shipping generative AI backends for top-ranked iOS apps.

Looking ahead, I am interested in pursuing a Master's degree when the right opportunity arises, with a focus on next-generation networking, communication systems, and secure cloud or IoT infrastructure.

Experience

Professional work

From API engineering to AI deployment and VPN/network infrastructure — progressive growth across backend systems at Brain Craft Ltd.

Aug 2025 – Present

Dhaka, Bangladesh

Software Engineer — Level 3

Brain Craft Ltd

Leading backend and network infrastructure for VPN and multimedia products.

Architected the core web backend for the VPN for iPhone app to handle client authentication and server orchestration.
Configured Linux network infrastructure across global nodes, deploying WireGuard, IKEv2/IPsec, OpenVPN, and multi-hop routing setups.
Built microservices with Redis caching to process real-time multimedia traffic at low latency.
Mentored junior backend engineers and conducted code reviews.

VPN for iPhoneCartoon.AiSticker MakerGIF Maker

Sep 2023 – Aug 2025

Dhaka, Bangladesh

Software Engineer — Level 2

Brain Craft Ltd

Focused on AI/ML pipeline deployment and GPU cloud optimization.

Containerized and deployed AI/ML pipelines across multi-cloud GPUs (AWS, GCP, RunPod, Vast.ai).
Hosted open-source generative AI models for image stylized cartoonification and video generation.
Optimized GPU/CPU memory usage and inference workloads, lowering cloud server costs.

Cartoon.AiSticker MakerGIF Maker

Dec 2021 – Sep 2023

Dhaka, Bangladesh

Software Engineer — Level 1

Brain Craft Ltd

Built scalable APIs and authentication systems for production applications.

Engineered and maintained scalable RESTful APIs integrating backend services with client applications.
Optimized queries, schemas, and indexing to lower API latency and boost system performance.
Implemented JWT/OAuth authentication, role-based access control, and basic data encryption.
Refactored legacy codebases to reduce complexity and improve maintainability.

GIFBuzHR Management System

Jul 2019 – Sep 2020

Dhaka, Bangladesh

Analyst

Quantanite Bangladesh Ltd

Data processing and reporting in the Data Processing department.

Executed data processing, content moderation, and structured data entry.
Maintained regular project reporting directly to supervisors and management.

Education

Academic background

Strong foundation in computer science, networks, and AI — with interest in graduate study in networking and communication systems when the right opportunity arises.

2015 – 2019

Dhaka, Bangladesh

B.Sc. Computer Science and Engineering

Daffodil International University · Medium of Instruction: English

CGPA 3.89 / 4.00 · Ranked top of the class

Key coursework: Data Communication, Computer Networks, Wireless Programming, Digital Electronics, Embedded Systems, Artificial Intelligence, Microprocessor and Assembly Language, Computer Architecture.

Thesis

Bangla Handwritten Character Recognition Using CNN

CNN-based image recognition with image processing and feature extraction.

Embedded / IoT · Demo

Arduino Robot Car — Autonomous & Wireless Control

Autonomous and Bluetooth remote-controlled robotic car.

2021

Professional training

Complete Web Development Course

Programming Hero · MERN stack

Built full-stack, cloud-based web applications with MongoDB, Express, React, and Node.js — including client–server communication over RESTful APIs.

Looking ahead

Interest in Master's studies

When the right opportunity arises, I aim to pursue graduate studies in Information and Communication Engineering — focusing on next-generation networking algorithms, secure cloud infrastructure, and IoT systems that build on my backend and network engineering experience.

Selected work

Featured systems

Network-based multimedia products I have helped build and ship — AI-driven image and media pipelines serving millions of users.

Secure 360 Internet Security · 59K+ ratings

VPN for iPhone

Backend and Linux network infrastructure for a top-rated VPN product — secure tunnels over WireGuard, IKEv2/IPsec, and OpenVPN, with multi-hop (Double VPN) routing across 80+ server locations.

WireGuardIKEv2/IPsecOpenVPNMulti-hop VPNLinuxiptablesNginxDockerPythonBash

View project

AI Art Generator

Cartoon.ai

Backend architecture and AI model deployment for photo illusions, cartoon generation, face swapping, and instant photo creation — served at scale over the network.

PyTorchFlaskPostgreSQLDockerAWSHugging Face

View project