Translate requirements into solutions
Turn ambiguous business needs into clear technical scope, trade-offs, and a plan that stakeholders can follow.
SENIOR SOFTWARE ENGINEER | FULL-STACK | MOBILE | BACKEND
Building software that solves real business problems.
I'm H. M. Masum Billah, a senior software engineer with 10+ years of experience building scalable backend systems, WordPress/WooCommerce platforms, SaaS products, and cloud applications, and leading the engineers who ship them.
Stack
.NET CorePHPLaravelWordPressPythonAWSReactDocker
H. M. Masum BillahSenior Software Engineer, Bangladesh
10+ yrs
I don't just write code. I understand the business, design the solution, ship it, and own it in production.
- 01Understand
- 02Design
- 03Ship
- 04Own
CAPABILITIES
What I bring to a team or a project.
Eight things I do reliably, across the full lifecycle of a product.
Build production-ready systems
REST APIs, SaaS backends, and mobile apps built with validation, error handling, and deployment in mind from day one.
Integrate third-party platforms
Payment gateways, shipping, CRMs, and external APIs, including the harder parts: retries, webhooks, and edge cases.
Debug the hard problems
Methodical root-cause analysis across code, database, server, and network when the obvious fixes haven't worked.
Optimize slow systems
Profile first, then fix: queries, indexes, caching, payload size, and server configuration where it actually matters.
Work across the whole stack
Comfortable moving between web frontends, backend services, Flutter mobile apps, and the infrastructure under them.
Improve existing production systems
Inherit a codebase, understand it, stabilize it, and evolve it safely without stopping the business.
Take ownership
I follow work through to delivery and beyond, communicating early, flagging risk, and finishing what I start.
PROJECTS
Selected projects.
Platforms, integrations and applications: the problem and what I built.
AIMOSA: Amazon Ad Automation Platform
- Problem
- Amazon KDP authors and sellers managed ad campaigns by hand across separate Amazon Ads and KDP dashboards, with no single view of ad spend against sales, making unprofitable campaigns hard to spot and budgets hard to optimize.
- Solution
- Built a web platform that pulls live campaign and sales data from Amazon Ads and KDP into one dashboard, so users can monitor performance and manage their ads in one place.
- My role
- Built secured ASP.NET Core REST APIs with JWT authentication and CORS, implemented Stripe one-time and subscription billing, and automated Docker deployments with GitHub Actions CI/CD.
AirControl Client (AI)
- Problem
- Flight simulator pilots relied on scripted, limited built-in air traffic control that could not respond naturally, breaking realism and making radio procedures hard to practice.
- Solution
- Developed a Windows desktop app that lets pilots talk to AI-powered air traffic controllers by voice or menu, using real-time aircraft and radio data from Microsoft Flight Simulator.
- My role
- Designed a WPF interface using the MVVM pattern, built the core ATC communication logic in C#, and integrated the SimConnect SDK for live flight data.
Micro Credit Management System
- Problem
- Microfinance organizations tracked members, loans, savings and installment collections in manual ledgers and spreadsheets, causing calculation errors, missed overdue follow-ups, slow month-end closing and no consolidated view of portfolio health.
- Solution
- Developed a C# desktop application with integrated MIS and AIS modules that digitized the full micro credit lifecycle, replacing manual bookkeeping with accurate, real-time reporting.
- My role
- Built MIS features for member registration, loan disbursement, installment scheduling, collections and overdue tracking, and an AIS module with double-entry vouchers, ledgers, trial balance, income statement and balance sheet.
Supplier Inventory Management System
- Problem
- Large WooCommerce stores had to keep supplier catalogs, competitor prices, orders and tracking in sync by hand, which was slow and error-prone.
- Solution
- A decoupled platform: a Dockerized Python FastAPI microservice with a React dashboard that automates FTP/CSV catalog sync, real-time competitor price scraping, order and tracking automation, and batch inventory updates over secure REST APIs with encrypted service communication.
- My role
- Designed and developed the platform end to end: the Dockerized Python FastAPI microservice, the React dashboard, the FTP/CSV sync, price-scraping and order-tracking automation, and the secure, encrypted REST API layer.
Dokan Stripe Multi Pay
- Problem
- Dokan marketplaces needed more payment methods at checkout, plus a reliable way to coupon orders and pay vendors their earnings.
- Solution
- Multi-payment support using Stripe Payment Element with Klarna, Apple Pay, Google Pay, SEPA and PayPal, with custom coupon handling and vendor earnings-transfer logic.
- My role
- Built the multi-payment integration with Stripe Payment Element, including the Klarna, Apple Pay, Google Pay, SEPA and PayPal methods, plus the custom coupon and vendor earnings-transfer logic.
Hotelinking Integrations
- Problem
- Hospitality platforms such as PMS and CRM systems each held their own data, and had to be connected reliably to the Hotelinking product.
- Solution
- Queue-driven Laravel microservices with webhooks that integrate PMS, CRM and hospitality platforms asynchronously.
- My role
- Developed the queue-driven Laravel microservices and webhook handling that connect PMS, CRM and hospitality platforms.
EXPERTISE
Tools and expertise.
Grouped by what they are used for. Not rated, because depth shows in the work.
Languages
- PHP
- JavaScript
- Python
- C#
- Java
Frameworks & CMS
- .NET Core
- Laravel
- WordPress
- WooCommerce
- Vue.js
- React
- FastAPI
- Bootstrap
Mobile
- Flutter
- Dart
- Kotlin (Android)
Databases
- MySQL
- PostgreSQL
- MongoDB
- Oracle 10g
Cloud & DevOps
- AWS (EC2, S3, RDS, IAM, CloudWatch)
- Docker
- Linux
- Nginx
Architecture
- REST APIs
- Queue systems
- Microservices
- SOLID
- PSR-4
Specialties
- WordPress plugin development
- Payment gateway integration
- AI agent development
- SaaS platforms
EXPERIENCE
10+ years building for the web and beyond.
- 10+years in web development
- 3+years in app development
- 400+projects completed
Jan 2026 to Present
Mediusware, Dhaka (On-site)
Software Engineer III (L-4), Mediusware
- Lead and mentor a small engineering team delivering scalable backend systems and enterprise applications.
- Architect and develop backend services using PHP, Laravel, Python, C# and .NET.
- Design modular, scalable architectures for high-traffic production environments.
- Develop and integrate RESTful APIs, including ASP.NET Web API, and third-party services.
- Manage AWS infrastructure including EC2, S3, RDS, IAM and CloudWatch.
- Drive system optimization, security best practices and application reliability.
Jun 2025 to Dec 2025
Mediusware, Dhaka (On-site)
Software Engineer II (L-3), Mediusware
- Designed and delivered scalable, secure and high-performance software solutions.
- Owned core features and supported system architecture and ongoing improvements.
- Worked with PHP, Laravel, C# and .NET across backend services and integrations, including ASP.NET Web API.
Jul 2024 to May 2025
Mediusware, Dhaka (On-site)
Software Engineer (L-2), Mediusware
- Designed and delivered scalable, secure and maintainable software solutions aligned with business and product requirements.
- Developed backend features, WordPress plugins and ASP.NET Web API services using PHP, C# and .NET.
Sep 2019 to Present
Remote
Senior Web Developer, GilroyWebDesign Creative Agency
- Develop custom web applications and CMS solutions for international clients.
- Own projects end to end, from requirements and architecture to development, testing and launch.
- Build custom themes, plugins and integrations on WordPress, WooCommerce and PHP frameworks.
- Optimize performance, security and SEO so client sites load fast and rank well.
- Work directly with clients across time zones, translating business needs into reliable software.
Jan 2010 to Jan 2026
Freelance
Senior Full Stack Developer, Upwork
- Delivered PHP, Laravel, WordPress and WooCommerce projects for global clients.
- Built custom plugins, APIs, payment systems and scalable web applications.
- Integrated third-party services, payment gateways and REST APIs into client platforms.
- Handled the full lifecycle of each project: scoping, development, deployment and ongoing support.
- Maintained long-term client relationships with successful project delivery.
Jan 2016 to Mar 2017
Dhaka, Bangladesh
Analyst Programmer, Source & Solution
- Developed ERP applications and enterprise reporting systems using Oracle 10g.
- Designed database schemas, queries and reports to support business operations.
- Gathered requirements from business users and turned them into working features.
- Tested, debugged and maintained production applications.
CREDENTIALS
Education, training and recognition.
Education
- M.Sc. in Computer Science & Engineering, Islamic University, Kushtia
- Bachelor of Business Studies (Honors), National University
Certifications & training
- AWS Cloud Solutions Architect
- Serverless Architectures on AWS
- Mastering AWS CDK: Coding Cloud Architectures
- React Nanodegree, Udacity
- Android Basic Nanodegree, Udacity
- Data Science & Machine Learning with Python
- Web Development with PHP & Laravel
- C# Programming and Entity Framework in Depth
Honors & awards
- Performer of the Year 2024 (December 2024)
- Employee of the Month (September 2025)
APPROACH
How I work.
- 01
Understand
Start with the business goal and constraints, not the technology.
- 02
Design
Choose the simplest architecture that will survive growth.
- 03
Build
Ship in small, reviewable increments with production in mind.
- 04
Harden
Test edge cases, handle failure, and measure performance.
- 05
Own
Deploy, monitor, and keep improving after launch.