> Welcome to Zawad's archive

Zawadul Kawum

Backend Engineer Engineering Lead Distributed Systems

I design and run backend systems for businesses that depend on them every day. Enterprise ERP in Singapore, payments across Asia, healthcare distribution and streaming in Bangladesh.

Open to exciting opportunities

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60-second summary · or

$ uptime --impact

Impact

50M+ Toffee app downloads OTT streaming, Google Play, Bangladesh

5M+ T Sports downloads Sports streaming, Bangladesh

1M+ Payment transactions a day Philippines, Korea, Japan and India

53 Developers led Nexdecade Technology

10M+ Government system users Bangladesh

10K+ Pharmacy clients served Bangladesh

20+ Branches automated Bangladesh

INITIATING USER...WHO AM I ??

WHO AM I ??
User: zawadul.kawum
Real Name: Zawadul Kawum
Role: Senior Backend Engineer
Education: BSc, Asian University of Bangladesh
uname -a
Uptime: 11+ years (since 2015)
Specialty: System architecture and engineering leadership
Host: Jatrabari, Dhaka, Bangladesh
Status: Open to exciting opportunities

Hello, I am Zawadul Kawum

I design and run backend systems for businesses that depend on them every day: enterprise ERP in Singapore, payments across Asia, healthcare distribution in Bangladesh, and streaming on Toffee, one of Bangladesh's biggest OTT platforms with 50M+ Google Play downloads, and T Sports. I've led a team of 53 developers, and I still write the code.

I've also built face recognition attendance, PCB mismatch detection and a TZone temperature gateway system, and I work with high-scale MongoDB clusters, Kubernetes and Active Directory.

Software Engineer IV at Techzu Ichicode, a Singapore company, working hybrid from its Dhaka office.

GI LI X FA

Open Resume

Programming Languages

PHP Java C# Python JavaScript Kotlin

Platforms & Tools

Laravel Spring Boot ASP.NET Node.js CakePHP Kafka WebRTC Socket.io Docker Kubernetes

Specialities

System architecture Microservices on Kubernetes API design Payment integration High-scale MongoDB clustering Real-time systems Performance and cost Process automation AI integration Engineering leadership

backend-engineer v11.0 · since-2015

$ ls ./systems

Real-world systems

Things I built that run on real hardware, real data and real users.

Face recognition attendance

Marks attendance by recognising faces on camera.

Python · .NET · OpenCV

PCB mismatch detection

Flags boards that do not match during inspection.

Python · Vision AI

TZone temperature gateway system

My own system, with no vendor software, that decodes raw gateway data into exact records in MongoDB.

C# · Socket.io · MongoDB

High-scale MongoDB clustering

Replication and sharding for large, busy datasets.

MongoDB

Kubernetes orchestration

Runs streaming and payment platforms in production.

Kubernetes · Docker

Active Directory at Pharma Solutions

Central user accounts and access management.

Active Directory

$ git log --career

Experience

11+ years, since Feb 2015, drawn below as a distributed trace.

Dec 2024 – Present

Software Engineer IV

Techzu Ichicode Pte Ltd · Singapore company, hybrid from the Dhaka office

Architected the ERP for Singapore's largest aircon distributor, serving 10,000+ B2B clients
Built a WhatsApp Business integration that automates customer inquiries
Developed an AI document platform with OCR search that automates document processing
Integrated payments across 5 enterprise applications, including HitPay and AXS, with SGD 500K+ a month at 99.99% uptime
Built construction management software tracking 200+ active sites
Mentor a team of 8 engineers, with a 95% sprint completion rate

Enterprise ERP Payments AI and automation

Mar 2024 – Dec 2024

Head of Development

Nexdecade Technology

Led 53 developers across several stacks and delivered 25% faster after moving the teams to agile
Led development on Toffee, one of Bangladesh's biggest OTT platforms with 50M+ Google Play downloads, and T Sports with 5M+, serving millions of users with Spring Boot, Docker and Kubernetes
Oversaw WebRTC video calling, plus VMS and HRM products
Improved system performance by 30% and cut infrastructure costs by 20%
Brought API gateway response times under 200 ms

Streaming Real time Engineering leadership

Mar 2023 – Feb 2024

Asst. Manager, Payment and New Adventure Development

Adventure Dhaka Ltd

Built a global payment platform processing 1M+ transactions a day at a 99.8% success rate, using Spring Boot, Docker, Kubernetes and Kafka
Integrated gateways including PayPal, Adyen, Toss Pay, KakaoPay and 2C2P across the Philippines, Korea, Japan and India
Led NDC airline integration, including Lufthansa, and a multi-currency global hotel booking platform
Migrated the monolith to microservices

Payments Travel

Nov 2017 – Feb 2023

Asst. Manager, Application Development

Pharma Solutions Bangladesh Ltd

Built ordering systems for 10,000+ pharmacy clients and 800+ mobile field users
Automated ERP processes across 20+ branches, including HRM from recruitment to payroll
Delivered patient and inventory management with FEFO stock logic, handling 5,000+ invoices a day
Built real-time IoT temperature monitoring with C# and Socket.io
Worked on Active Directory for central user accounts and access management

Healthcare Distribution

Mar 2017 – Oct 2017

Sr. Software Engineer

Advance Business Solutions'N Support Ltd

Business and education ERP for 50+ clients, with a 20% performance gain

Enterprise ERP Education

Feb 2015 – Feb 2017

Software Engineer

Information Entertainment and Communications Ltd

Government systems serving 10M+ users and banking systems handling 10K+ requests a day

Government Banking

Education

Bachelor of Science

Asian University of Bangladesh · GPA 3.90

Education

HSC / Alim

Tamirul Millat Kamil Madrasah · GPA 4.92

Education

SSC / Dakhil

Tamirul Millat Kamil Madrasah · GPA 5.00

Skill tree

My Core Skills

The stack I use in production today, with years of hands-on experience where it counts.

Languages

PHP 10+ yrs
Java
C# 7+ yrs
Python
JavaScript 10+ yrs
Kotlin

Backend

Laravel 8+ yrs
Spring Boot 5+ yrs
ASP.NET
Node.js 4+ yrs
CakePHP

Data

MySQL 10+ yrs
PostgreSQL 5+ yrs
MongoDB 8+ yrs
Redis 6+ yrs
SQL Server
Oracle

Real time and infrastructure

Kafka 3+ yrs
WebRTC
Socket.io
Docker 5+ yrs
Kubernetes 4+ yrs
Google Cloud
AWS
Active Directory

Frontend and mobile

Vue.js
Angular
Android 6+ yrs
Ionic
Flutter

AI

Vision AI
OCR
Speech Recognition
Face Recognition
OpenCV
Whisper
ONNX Runtime
Claude Code

Also worked with

.NET Core CodeIgniter Symfony Java Servlet Java Swing C and C++ IBM DB2 SQLite Apache Tomcat CentOS Ubuntu Windows Server AngularJS Unity MATLAB iReport

~/archive

Projects

[Business Systems]

Training

Professional training I have completed alongside production work.

./connect

Get in Touch

Glad to talk about backend architecture, payments, ERP and leading engineering teams.

zawadul.kawum@gmail.com

Location Jatrabari, Dhaka, Bangladesh
Open in Google Maps ↗

Profiles

GitHub LinkedIn X / Twitter

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Zawadul Kawum

Impact

Hello, I am Zawadul Kawum

Programming Languages

Platforms & Tools

Specialities

Real-world systems

Face recognition attendance

PCB mismatch detection

TZone temperature gateway system

High-scale MongoDB clustering

Kubernetes orchestration

Active Directory at Pharma Solutions

Experience

Software Engineer IV

Head of Development

Asst. Manager, Payment and New Adventure Development

Asst. Manager, Application Development

Sr. Software Engineer

Software Engineer

Education

Bachelor of Science

HSC / Alim

SSC / Dakhil

My Core Skills

Languages

Backend

Data

Real time and infrastructure

Frontend and mobile

AI

Also worked with

Projects

Toffee and T Sports Streaming Platforms

ERP for Singapore Aircon Distributor

WhatsApp Business Integration

AI Document Platform

Construction Management Software

Global Payment Base

PayPal Payment Microservice

Tosspay Payment Microservice

Adyen Payment Microservice

Lufthansa Airlines Microservice Integration

Kakaopay Microservice

2C2P

Patient and Inventory Management System (PAIMS)

Promo Material Management System (PMMS)

Trade Return Management System (TRMS)

Construction and Inventory Management System (CIMS)

Chemist Ordering System API (For Mobile App)

eZrx Order Collection System API (For Mobile App)

Trade Return Management System API (For Mobile App)

Subscriber Management System API (SMS)

DreamN App API

Quality Management System (QMS)

Chemist Ordering System Web (COS)

eZrx Order Approval System (OCSCLIENT)

eZrx WebSales Report (EWSR)

Trade Return Client Portal System (TRMS CLIENT)

eZRX Customer Creation (eZRXCust)

Web Based Management System (WBMS)

Creative Accounts and Inventory Management System (CAIMS)

Subscriber Management System Web (SMS)

eZrx Order Collection System (Mobile App)

mFirstV3 CROSS Platform (IONIC)

Third Eye Police Application (Demo)

DreamN App

eZrx SMART (Desktop Based App)

Jamaljay Ecommerce Application (API)

Jamaljay Ecommerce App (IONIC)

Service Request and Complaint Management System (SRNCMS)

Customer Service Request and Complaint Management System

Delivery Route Planning System DRP (Fleet Management)

HRIS Attendance System API (For Mobile App)

HRIS Attendance System Web (For iOS Mobile App)

HRIS CV Portal System (HRIS CV)

GPP (Generic Push Pull Program)

FINSMART mobile Application (API)

FINSMART CROSS Platform (IONIC)

SinoSMS