Mahadi Hassan

Promoted to Senior Software Engineer. Own backend architecture across enterprise healthcare, fintech, AI, and OTT products — modular service design, production REST APIs, reusable shared modules, JWT/RBAC access control, Redis caching, async jobs, and query optimization. Lead code reviews, mentor engineers, and shape engineering standards. Current work: Sonali Pay, VelaCrew.ai, PB Play, and EMPATHIKA.

Built scalable backend services and production REST APIs for enterprise healthcare and SaaS platforms in TypeScript/NestJS on PostgreSQL and Redis, and supported AWS/Docker deployments with Product, Frontend, QA, and DevOps teams.

Led backend development for an interconnected SaaS ecosystem (system/SaaS/service admin portals, Web POS, and customer & service mobile apps). Designed a microservices architecture with NestJS, TypeORM & MySQL; built real-time chat (Socket.IO), a custom form builder, and a dynamic calendar planner; ran an in-house Kafka pipeline; and implemented custom auth with Access/Refresh tokens, MFA, and Firebase FCM.

Lead full-stack engineer for an ICT-Ministry-funded EdTech platform. Own end-to-end development and deployment — a React + Material UI frontend on a Node/Express/Sequelize + MySQL backend — including SSL Wireless payment-gateway integration, authentication security, and ongoing performance and scalability work.

Built a large-scale garment-manufacturing dashboard tracking real-time production with comprehensive reporting and built-in BI tools. Implemented multi-level access control (module/feature/resource tiers via roles & groups) and a garment-wash-plant data API. Stack: React, Material UI, AG Grid & Recharts; Node/Express/Sequelize; MSSQL, Redis, DB2/AS400.

Modular NestJS backend services for a multi-country remittance and financial platform — integration flows connecting banks and mobile financial service (MFS) providers across countries, channels, and corridors on Azure.

A distributed token-bucket rate limiter in NestJS + Redis with a live dashboard that shows requests getting throttled in real time.

Backend services for a complete OTT ecosystem — media management, playlist creation and publishing, monetization, and APIs behind Web and Android playback plus iOS and tvOS player SDKs.

A field-service management SaaS built as 14 NestJS microservices with Expo mobile apps and a Next.js admin — auth, dispatch, AI diagnostics, invoicing, and real-time notifications.

Scalable backend for an enterprise healthcare platform — secure NestJS + Fastify APIs on PostgreSQL & MongoDB, Redis caching, deep AWS integration, and Docker deployment, supporting patients, appointments, and medical records.

An AI operations platform for workflow automation and enterprise system integration — Hono + Drizzle on PostgreSQL, containerized on AWS EKS, with multi-provider LLMs via LiteLLM and OpenRouter.

Elective going beyond the basics — query optimization, transactions, indexing, and distributed data — deepening the database focus that anchors my backend career.

Sampling, filtering, transforms, and frequency-domain analysis of digital signals — the DSP fundamentals, with a lab.

Rendering pipelines, transformations, and rasterization — the math and programming behind drawing to the screen, with a hands-on lab.

Cryptography, authentication, secure protocols, and the fundamentals of protecting data and networks — foundations I still apply to secure auth and API design.

Studied core AI — search, knowledge representation, reasoning, and an introduction to intelligent-agent design, with a practical lab component.

Final semester: Project/Thesis, Artificial Intelligence, Data & Network Security, Computer Graphics, Digital Signal Processing, and Advanced Database Management Systems (Option-II). Final examinations Jan–Feb 2019.

A sessional on communicating engineering work clearly — technical documents, reports, and presentations.

The second phase of the integrated design project — carrying a multi-course team system through design and implementation to completion.

Elective covering supervised and unsupervised learning, model training, and evaluation — an introduction to building systems that learn from data.

Low-level programming of microprocessors and micro-controllers — registers, interrupts, and interfacing — how software meets hardware, with a lab.

Lexical analysis, parsing, semantic analysis, and code generation — building the front-to-back pipeline of how source code becomes something a machine can run.

Level-4 Term-1: Project/Thesis, Capstone (Phase II), Microprocessors & Embedded Systems, Compiler Design, Technical Writing & Presentation, Applied Statistics & Queuing Theory, Technology Entrepreneurship & Leadership, and Machine Learning (Option-I).

A sessional programming directly in assembly — registers, instructions, and how high-level code maps down to the machine.

Image enhancement, filtering, segmentation, and transforms — the fundamentals of processing digital images, with a lab.

The first phase of the integrated design project — scoping and designing a team system that pulls together several courses’ worth of skills.

Instruction sets, pipelining, memory hierarchy, and caching — understanding how CPUs actually execute programs and why performance behaves the way it does.

The TCP/IP stack, routing, and network protocols end-to-end — the networking foundation behind every API and distributed system I build, with a lab.

Level-3 Term-2: Capstone (Phase I), Computer Network, Computer Architecture, Digital Image Processing, Programming with Assembly Language, Engineering Economics & Sociology, and Financial & Managerial Accounting.

Numerical methods for real-world math — root-finding, interpolation, integration, and error analysis, with a lab.

Signals, modulation, and data-transmission fundamentals — how information moves across communication channels, with a lab.

The software lifecycle — requirements, design, testing, and project management — plus system and database design that shaped how I approach building real products.

Processes, threads, scheduling, concurrency, memory management, and file systems — the concepts I lean on daily when reasoning about performance and reliability, with a lab.

My first dynamic, database-backed web apps — PHP and MySQL on the LAMP stack with Bootstrap on the frontend, connecting every layer end-to-end for the first time.

Level-3 Term-1: Numerical Analysis, Software Engineering & Information System Design, Data & Telecommunication, Operating System, Web Programming, and Professional Ethics & Environmental Protection.

A hands-on sessional building larger programs — deepening object-oriented practice and problem-solving beyond the fundamentals.

Digital circuit design and pulse/timing techniques — building on digital logic toward real hardware, with a lab.

Advanced data structures and algorithm design — trees, graphs, hashing, and complexity analysis — the backbone of writing efficient code, with a lab.

First real databases — relational modelling, SQL, normalization, and transactions with MySQL. The start of a lasting focus on data design that still anchors my backend work, with a lab.

Level-2 Term-2: Database Management Systems, Data Structures & Algorithms-II, Digital Electronics & Pulse Technique, Advanced Programming, Electrical Drives & Instrumentation, and Complex Variable & Laplace Transformation.

Boolean algebra, combinational and sequential circuits, and the building blocks of digital hardware — how computation works at the gate level, with a lab.

Arrays, linked lists, stacks, queues, sorting, and searching — the first rigorous grounding in how to structure data and reason about efficiency, with a lab.

Object-oriented programming in C++ and Java — classes, inheritance, polymorphism, and learning to think in terms of design, with a lab.

Level-2 Term-1: Digital Logic Design, Data Structures & Algorithms-I, Object Oriented Programming, Electronic Devices & Circuits, and Vector Analysis, Matrices & Fourier Analysis.

Logic, sets, relations, combinatorics, and graph theory — the mathematical foundation underneath algorithms, databases, and computer science as a whole.

Learned C — my first rigorous, compiled language: variables, control flow, functions, pointers, and memory. A real introduction to how programs work under the hood, with a lab.

Level-1 Term-2: Discrete Mathematics, Structured Programming (C), Electrical Circuit Analysis, Engineering Drawing & CAD, Chemistry, ODE/PDE & Coordinate Geometry, and Bangladesh Studies.

Participated in the IUT 7th National ICT Fest 2015, organized by the IUT Computer Society — one of my first national-level tech events, early in my BSc journey.

My first university course in computing — how computer systems are organized, from hardware components to software, with a hands-on lab. The formal start of the CSE journey.

First semester: Introduction to Computer Systems, Physics, Differential & Integral Calculus, Technical & Communicative English, and Bengali Language & Literature.

Bachelor of Science in Computer Science & Engineering (Faculty of Electrical & Computer Engineering, session 2014–2015). Eight semesters over four years — with the usual term breaks and exam gaps between them — covering programming, data structures, databases, networks, operating systems, software engineering, and a final-year capstone and thesis. Graduated with a CGPA of 3.34 / 4.00.

HSC in the Science group under the Board of Intermediate & Secondary Education, Dhaka. Results published August 2014 with a GPA of 4.50 out of 5.00.

SSC in the Science group under the Board of Intermediate & Secondary Education, Dhaka. Results published May 2012 with a GPA of 4.44 out of 5.00.