Mohamed EL HOSAYNY

Senior .NET Engineer & Tech Lead

Building scalable microservices architectures with 8+ years of hands-on expertise in .NET, Azure, and modern software craftsmanship.

Île-de-France, France • 8+ years experience

Get in touch

About Me

As a Senior .NET Engineer and Tech Lead, I combine deep technical expertise with hands-on leadership. Currently at TUI France, I lead a team of 3 developers while actively contributing to codebase development, modernizing authentication with OAuth 2.0, and implementing observability solutions with OpenTelemetry that significantly reduce incident detection time.

Architecture & Design

Microservices, Clean Architecture, Domain-Driven Design (DDD), SOLID principles

Cloud & DevOps

Microsoft Azure, Azure DevOps, CI/CD Pipelines, Docker, Infrastructure as Code

Observability & Performance

OpenTelemetry (Logs & Traces), OpenSearch, Structured Logging, Performance Optimization

API & Integration

API Gateway design (Tyk, Apigee), RESTful APIs, OAuth 2.0, IdentityServer

Skills & Technologies

Languages

  • C#
  • JavaScript
  • SQL

Frameworks

  • ASP.NET Core
  • ASP.NET MVC
  • Web API
  • HTML5
  • CSS3

Databases

  • SQL Server
  • MySQL

Testing & Quality

  • xUnit
  • Reqnroll
  • SonarCloud

DevOps & Cloud

  • Azure DevOps
  • Microsoft Azure
  • Docker
  • CI/CD Pipelines
  • Git
  • GitHub

Observability

  • OpenSearch
  • OpenTelemetry
  • Structured Logging

API Management

  • Tyk
  • Apigee

Authentication & Security

  • IdentityServer
  • OAuth 2.0
  • Token Exchange

Architecture & Patterns

  • Clean Architecture
  • Domain-Driven Design (DDD)
  • Microservices
  • Design Patterns
  • SOLID Principles
  • Clean Code

Professional Experience

Senior .NET Engineer & Tech Lead

TUI France

February 2024 – Present • Île-de-France, France

  • Lead team of 3 developers with focus on code quality, onboarding, and pull request reviews
  • Implemented API Gateway (Tyk Supergraph) exposed via Google Apigee for partner and mobile app integrations
  • Integrated OpenTelemetry (Logs & Traces) across microservices architecture, significantly reducing MTTD
  • Modernized authentication layer with OAuth 2.0 and Identity Server migration
  • Active hands-on development: new features, maintenance, unit testing, and CI/CD pipeline management
C# ASP.NET Core Web API SQL Server Azure DevOps xUnit Reqnroll OpenTelemetry Tyk Apigee

.NET Engineer

Artza Technologies

July 2020 – January 2024 • Remote

  • Developed and maintained complex features in C# and ASP.NET Core environments
  • Established complete CI/CD pipelines on Azure DevOps for automated builds and releases
  • Implemented unit testing (xUnit) and integration testing strategies for code reliability
  • Refactored legacy code to improve maintainability and performance
  • Documented APIs and development processes for team knowledge sharing
C# ASP.NET Core Web API SQL Server Azure DevOps xUnit Selenium

Full Stack Developer

Grupo Avalon

May 2020 – June 2020 • Tétouan, Morocco

  • Conducted code audits to identify technical debt and improvement opportunities
  • Implemented automated tests to secure product evolution
  • Refactored critical modules following SOLID principles
C# ASP.NET Core xUnit SQL Server Git

Web Developer

Barid Media (Groupe Barid Al Maghrib)

April 2017 – April 2020 • Morocco

  • Designed and developed web and desktop applications (WinForms) for internal management
  • Participated in all project phases: requirements analysis, development, testing, production deployment
  • Maintained and evolved existing applications (corrective and evolutionary maintenance)
C# ASP.NET Core Windows Forms SQL Server jQuery JavaScript

Education

Master's Degree

2020 – 2021

Software Engineering - Design & Development

Université Hassan I - FST SETTAT - Morocco

Professional License

2016 – 2017

Software Engineering & System Administration

École Supérieure de Technologie, Casablanca - Morocco

Let's Connect

I'm open to new opportunities, collaborations, and conversations about .NET, microservices, and cloud architecture.