● SOFTWARE ENGINEER · C# / .NET
I'm Houssein Ammar. I build secure banking integrations, enterprise applications, and the systems that keep businesses moving.
Server load reductionHamster POS
Active clients supportedHamster POS systems
Users servedFreelance web applications
01 / SELECTED WORK
Banking, business, and automation.
A closer look at the systems I've worked on.
Securing the messages that move money.
Developed security and LAU integration for SWIFT MT, MX, and FileAct messages, including HMAC/GCM processing, LAU injection, validation, and secure message exchange.
Enterprise transaction and message processing.
Worked on an enterprise banking platform integrated with SWIFT for secure message transfer and processing.
Connecting restaurants, drivers, and operations.
Developed Restaurant and Driver Flutter applications with delivery requests, location and zone-based driver management, and an Admin monitoring page for operational status.
From imported files to validated compliance data.
Developed automated compliance-list processing with imports, filtering, validation, database processing, error handling, and event journaling.
Detecting duplicates before repeated processing.
Developed and maintained a banking application for detecting duplicate transactions and messages to reduce duplicate processing.
Scheduled reports, powered by database workflows.
Developed a database-driven service for scheduled report generation using Crystal Reports, SQL Server, and Windows Services.
Software built around daily business operations.
Developed and maintained POS and business-management applications with API integration, database processing, reporting, and operational support.
Project summaries reflect professional contributions. Visuals are conceptual illustrations, not product interfaces.
02 / EXPERIENCE
From responsive websites to
security-focused financial systems.
Jan 2025 — PresentCurrent
Developing enterprise and banking applications with C# and .NET, integrating backend APIs and SWIFT-connected systems. Contributing to security reviews, vulnerability remediation, and secure server and cloud deployments.
Jan 2023 — Dec 2024
Built and maintained Java POS applications and REST services. Optimized queries and performance to reduce server load by 37%, supporting systems used by 250+ active clients.
Sep 2020 — Dec 2022
Developed full-stack web applications serving 5,000+ users, combining responsive interfaces with C#, PHP, and Laravel backend features.
Jan 2020 — Aug 2020
Developed 18 responsive websites and built and consumed backend APIs handling 500+ requests per second. Implemented penetration testing and vulnerability scanning.
03 / ABOUT & TOOLKIT
I connect software, infrastructure, and security
to deliver practical, maintainable solutions.
My work spans enterprise and banking applications, API integration, database optimization, and secure application development. I enjoy working where reliability matters and the details make a difference.
EDUCATION
Lebanese International University
September 2018 — July 2022
Arabic Native · English Fluent · French Basic
C# / .NET / .NET Core / Java / PHP / Laravel / Python / JavaScript / React / Angular / Flutter
SQL Server / MySQL / PostgreSQL / MongoDB / Redis / REST APIs / SOAP / JSON / XML / SWIFT
AWS / Azure / Windows Server / Secure coding / Vulnerability scanning / Application audits
CyberOps Associate / Network Security / CCNA R&S: Scaling Networks / Routing & Switching Essentials / CCNAv7: Introduction to Networks / CCNAv7: Bridging / C++ Essentials / Python Essentials / Introduction to Cybersecurity
04 / LET'S CONNECT
Let's talk about your next application, integration, or engineering opportunity.
housseinammar693@gmail.com ↗