Hi, I'm Md. Rabiul Hassan Mahmud
15+ years crafting robust, scalable software. From startup MVPs to enterprise systems — I turn complex problems into elegant solutions.
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About Me
Senior Software Developer & Architect
I'm a passionate software developer with over 15 years of experience designing and building scalable web applications, APIs, and distributed systems. I thrive at the intersection of clean architecture and pragmatic delivery.
Throughout my career I've worn many hats — from individual contributor to tech lead — guiding teams across fintech, e-commerce, and SaaS. I care deeply about code quality, developer experience, and shipping products that actually make a difference.
When I'm not coding, I'm mentoring junior developers, contributing to open source, or exploring the latest advancements in cloud-native and AI-assisted development.
What I work with
Skills & Tech Stack
Frontend
Backend
Data & Infra
DevOps & Tools
Also comfortable with
Career journey
Experience
Senior Project Manager
Leading architecture and delivery of a multi-tenant SaaS platform serving 2M+ users. Drove migration from monolith to microservices, reducing deployment time by 70% and infrastructure cost by 40%.
- Designed event-driven architecture using Kafka & Kubernetes
- Mentored a team of 8 engineers across 3 time zones
- Reduced API latency by 60% through caching and query optimization
Principal Software Engineer
Built core banking APIs and real-time payment processing systems handling £5M+ daily transactions. Ensured PCI-DSS compliance and 99.99% uptime SLA.
- Engineered high-throughput payment pipeline processing 10k TPS
- Led OAuth 2.0 / OpenID Connect identity platform rollout
- Introduced automated testing, raising coverage from 20% to 85%
Senior Software Engineer
Developed full-stack features for a high-traffic retail platform with 500k daily visitors. Owned search, recommendation engine, and checkout optimizations.
- Integrated SRE (Speech Recognition) API into a web app for targeting the Japanese people.
- Developed a music blog for a Japanese client.
- Worked in QR based payment method used in Japan for Japanese vending machines.
- Developed a railway information website for targeting the audience who are aiming to visit Japan.
- Optimized performance of an e-commerce site by 30% targeting the Japanese market.
- Migrated Javascript React project to Typescript React to support TypeScript features.
Software Engineer
Started my professional journey building CMS-driven websites and internal tools for SMB clients. Gained solid foundations in web standards, accessibility, and agile delivery.
- Technical leader of software development team consists of 7 members.
- Lead ERP and Micro Finance software development team since 2015.
- Developing an ERP large scale software including 5 modules (Inventory, FAMS – Fixed Asset Management System, Procurement, HR and Payroll and Accounting).
- Developing Micro Finance software for NGO.
- Managing server with Linux Cent OS.
Software Engineer
Started my professional journey building CMS-driven websites and internal tools for SMB clients. Gained solid foundations in web standards, accessibility, and agile delivery.
- Website Development using WordPress and custom CMS.
- Software and Web Application Development by using PHP, MySQL, JavaScript, jQuery, AJAX, JSON.
- Customized Web Application.
- Lead a team of Quality Control (QC) as a Head of QC.
- Lead a team of Junior Software Engineer.
- Supervise an Oursourcing Department for the proper guidance and the individual development.
Programmer
Started my professional journey building CMS-driven websites and internal tools for SMB clients. Gained solid foundations in web standards, accessibility, and agile delivery.
- PSD to HTML conversion.
- HTML to WordPress conversion.
- Custom Software Development using PHP and MySQL.
- Website and Blog Development using WordPress.
- Website Development using Joomla, Drupal.
- Website Redesign and Maintenance.
- Customized Web Application.
Web Developer
Started my professional journey building CMS-driven websites and internal tools for SMB clients. Gained solid foundations in web standards, accessibility, and agile delivery.
- PSD to HTML conversion.
- HTML to WordPress conversion.
- Website and Blog Development using WordPress.
- Customization and Modification of WordPress and WordPress plugins.
- Website Redesign and Maintenance.
- Customized Web Application.
What I've built
Featured Projects
A selection of projects from my career — production systems, open source tools, and side projects.
Let's work together
Get In Touch
Whether you have a project in mind, need a technical advisor, or just want to chat — my inbox is always open.
Let's connect
I'm currently available for freelance work, consulting engagements, and senior full-time roles. If you have an interesting project or opportunity, I'd love to hear about it.