Dennis Frühauff — Software Consultant & Backend Specialist

I build backend systems that hold up in production — from architecture to deployment. Over five years on a complex enterprise energy platform, I've shipped 1,000+ changes and know what it takes to keep a large codebase running reliably.

Core Expertise

Backend Development — .NET / C# Deep hands-on experience with the modern .NET ecosystem, including leading a .NET 7 → 10 migration. I build REST APIs with ASP.NET Core, apply CQRS and Mediator patterns, and structure projects around Vertical Slice Architecture to keep large codebases navigable and testable.

Event-Driven & Distributed Systems Designed and built message-driven architectures using MassTransit and Amazon SQS. This includes consumers, event pipelines, and Hangfire background processors that hold up under real production load.

Data & Persistence Fluent with PostgreSQL, Oracle, and Entity Framework Core including schema migrations and performance tuning. Experience with Redis caching and cloud object storage (AWS S3).

Domain-Driven Design & Complex Business Logic I do well in domains with substantial business logic. In energy markets, I've built time series calculators, nomination engines, metering data pipelines, and financial instruments from scratch — turning complex domain requirements into well-tested code.

API Design & Security I build versioned, OpenAPI-documented APIs with JWT Bearer authentication, policy-based authorization, and rate limiting — both public-facing and internal service interfaces.

Cloud & Infrastructure

  • AWS: S3, SES, Secrets Manager, SQS
  • Terraform for infrastructure-as-code
  • Docker & containerized deployments
  • CI/CD pipeline configuration and maintenance

Quality & Craftsmanship

  • Test-driven: Unit, integration, and end-to-end system tests (xUnit, AwesomeAssertions)
  • Observability: Structured logging, distributed tracing, business activity telemetry
  • Static analysis: Roslyn analyzers, enforced coding standards
  • AI tooling: Daily use of GitHub Copilot and custom agent workflows

Industry Domain: Energy Markets

Five years in the energy sector — renewable power, nominations, market forecasting, metering data, and cross-border trading. I understand both the technical and business sides of energy data platforms.

Available for consulting engagements in backend architecture, .NET platform development, and energy/utilities software.