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Mohammad Hassan

Senior Software Engineer

Montreal, QC · mahmud.sust@gmail.com

Senior software engineer with eleven years modernizing one business-critical platform — from .NET Framework to .NET Core, on-prem to Azure/AWS, manual finance operations to unattended automated billing. I design for correctness and reliability, integrate complex enterprise systems, and mentor teams toward CI/CD and agile practices.

Experience

Vision33

Remote · Montreal, QC

  1. Senior Software Developer

    Apr 2025 – Present

    • Lead design and development of internal .NET Core web platforms (Partner and Employee portals) providing secure, 24/7 web access to SAP Business One data.
    • Architect integration workflows on the Saltbox platform, connecting ERP, HR, and finance systems across SQL Server, Azure, and AWS to eliminate data silos.
    • Own automated financial features — auto-invoicing, recurring billing, and data migration — built on C#, .NET, and cloud functions, including Avalara AvaTax integration.
    • Serve as senior technical advisor; mentor junior developers and champion CI/CD and agile practices across the team.

  2. Software Developer

    Jul 2016 – Mar 2025

    • Built and owned internal .NET Framework and .NET Core applications for HR and finance workflows, integrated with SAP Business One.
    • Implemented automated invoicing, custom reporting, and recurring background services using C#, ASP.NET MVC/Core, SQL Server, AWS, and Azure.
    • Delivered integration services for third-party APIs, including Smartsheet and Avalara AvaTax.
    • Migrated legacy applications to modern platforms — upgrading to .NET Core and deploying to the cloud.

  3. Intern & Part-Time Developer

    Aug 2015 – Jun 2016

    • Contributed C# features to .NET Framework applications; assisted with SQL Server and external API integrations, gaining first Azure and AWS deployment experience.

Selected Work

  • ERP Integration Platform

    Integration Architecture

    Internal partner and employee platforms providing secure 24/7 web access to SAP Business One, with Saltbox-orchestrated workflows connecting ERP, HR, and finance systems.

  • Automated Billing & Tax Engine

    Financial Automation

    Unattended recurring billing — scheduled worker services that generate invoices, calculate tax through Avalara AvaTax, and post to SAP Business One with idempotent, replay-safe runs.

  • Secure NFC e-Prescription System

    Applied Cryptography

    A privacy-preserving mobile e-prescription protocol using cryptographic proxy signatures for delegation and short group signatures for medical anonymity, delivered over NFC on low-power devices.

  • Metabolomic Biomarkers for Osteoarthritis

    Data Science & Causal Inference

    Causal inference on population-based knee osteoarthritis data — Bayesian network structure learning to surface candidate metabolomic markers, validated with structural equation modeling and path analysis.

Capabilities

Platform
C#, ASP.NET Core & MVC, Worker Services, REST APIs
Integration & Cloud
SAP Business One, Saltbox, Azure, AWS, Avalara AvaTax, Smartsheet
Data
SQL Server, Firebase, caching, financial reporting
Frontend & Mobile
Next.js, Flutter, offline sync, biometric auth
Applied Research
Cryptographic protocols, Bayesian networks, SEM & path analysis