Senior .NET Engineer — Distributed Systems | Event-Driven | DevOps & Observability

Senior software engineer with 10+ years of experience designing, building, and modernizing enterprise systems in banking and industrial/IoT domains.

I focus on .NET backend and distributed systems: microservices, messaging, and data-intensive workloads. I care about maintainability, testability, and operability—clean architecture, strong automation, and observability instead of one-off “hero” fixes.

Currently open to remote contract, freelance, and permanent senior backend/.NET roles across the EU. Based in Germany, authorized to work in the EU.

• Backend Engineering

  • .NET 8, ASP.NET Core, C#, EF Core, REST APIs, SignalR
  • Messaging with RabbitMQ, integration patterns, idempotency/outbox

• System Design & Architecture

  • Microservices, Event-Driven Architecture
  • Domain-Driven Design (DDD), CQRS, modular monolith patterns
  • Resilience, fault-tolerance, and performance for data-heavy systems

• DevOps & Observability

  • Docker, Docker Compose, k3d/Kubernetes
  • CI/CD: GitHub Actions, Azure DevOps, Jenkins
  • OpenTelemetry, Prometheus, Grafana, Sentry, Zipkin

• Frontend

  • Blazor, MudBlazor
  • TypeScript, React, modern SPA patterns

• Data Stores

  • PostgreSQL, SQL Server, MongoDB
  • Schema design, migrations, performance tuning, read/write segregation

• Testing

  • xUnit, Testcontainers, Playwright
  • TDD/BDD, integration tests, end-to-end/system tests

StockSim is an open-source, event-driven trading and portfolio simulation platform built to showcase a realistic, end-to-end modern .NET stack.

Key aspects:

• Architecture

  • Multiple bounded contexts (Trading, Portfolio, MarketFeed, Web) built with DDD-style aggregates and domain events
  • Microservices communicating over RabbitMQ with outbox/inbox for reliable, idempotent messaging
  • PostgreSQL as primary store with clear separation between transactional and read models

• Frontend & UX

  • Real-time dashboards using Blazor Server + MudBlazor
  • React/TypeScript SPA using SignalR for live quotes and order updates

• DevOps & Observability

  • Fully containerized with Docker Compose and k3d for local clusters
  • CI/CD with GitHub Actions (build, test, container images)
  • OpenTelemetry tracing + Prometheus + Grafana + Zipkin for metrics and distributed tracing

• Testing

  • Domain and integration tests with xUnit + Testcontainers (PostgreSQL, RabbitMQ)
  • End-to-end UI flows with Playwright

Goal: A practical, production-like reference for microservices, messaging, observability, and automated testing in modern .NET backends.

• Hardening patterns for event-driven .NET systems (idempotency, backpressure, retries, dead-letter handling)
• Improving observability-first designs for distributed applications
• Exploring Azure Container Apps / Kubernetes deployments for .NET microservices
• Incrementally polishing and extending StockSim as a public showcase project

• Email: [email protected]
• LinkedIn: https://www.linkedin.com/in/oussamahammami/