Heiko Huvermann - Fullstack Developer and Architect

🚀 FRATCH GPT 2.0 - Find freelancers with a single prompt. Now including price benchmarking.

Recommended expert

Petershagen, Germany

Check rate

Experience

May 2025 - Jul 2025

3 months

Fullstack Developer / Architect

Design and implementation of a solution for managing projects, materials, and assets in field operations
Development of a modern web application (Blazor) for project managers to track inventory, plan demand, and issue transport and purchase orders
Delivery of a mobile MAUI app for field staff to store and retrieve materials with location-based photo documentation in map views
Control of the full business logic through a central API
Tech stack: .NET 9, C#, WebAPI, Blazor, MAUI, REST, PostgreSQL, Entity Framework, Docker, Docker Compose, Ansible, Keycloak, Aspire
Identity and access management with Keycloak
Deployment and orchestration via Docker Compose and Ansible
Project in testing and evaluation phase

Jan 2025 - Aug 2025

8 months

Self-Study & Prototyping

Creation of small sample applications with React and .NET MAUI to evaluate modern cross-platform and cloud development approaches (Microsoft Aspire)
Learning projects on infrastructure as code and orchestration with Terraform, Ansible, and Kubernetes (local and in the cloud)
Development of a C# .NET 9 prototype for outdoor storage management with Keycloak authentication and Aspire integration
Implementation of a C#-based AI tool server with integration into Open WebUI
Experiments with automation workflows using n8n

May 2023 - Nov 2024

1 year 7 months

Architect and Lead Developer

Complete redesign of the codebase and user interface of a multi-user WPF application for the automated programming of tamper-proof fiscal data sticks with an integrated SLE module
Building a scalable, testable architecture with CQRS and a modular printer plugin structure
Implementation of security-critical cryptography and production processes (PKI/OpenSSL)
Control of the production process from license number management to certificate creation and delivery of firmware and configuration data to micro-SD cards
Monitoring of central services with automatic failover and status indicators to avoid production interruptions
Creation of unit and integration tests (XUnit, Moq)
Coordination of a small developer team
Tech stack: C# (.NET 6), WPF, MVVM, MaterialDesign, CommunityToolkit, REST API, Entity Framework 7, Oracle, Nexus Repository, FTDI integration, serial interfaces, Mediator pattern, Git

Mar 2019 - Dec 2022

3 years 10 months

Senior Software Developer / Architect

Design and further development of a microservice architecture for cross-border control and monitoring of wind turbine fleets in European control rooms
Processing of real-time status information and integration of vendor-specific interfaces into a scalable system landscape
Design and implementation of a modular command agent for central remote control of wind turbines and power regulation for entire wind farms
Development of configuration software for flexible adaptation to different vendor protocols
Successful rollout into production with licensing and internationalization plans
Tech stack: C#, .NET Core, Microsoft SQL Server, OPC UA, RabbitMQ, Redis, Elasticsearch, Kibana, Prometheus, Grafana, Logstash, Azure DevOps, Docker, Consul, GraphQL, gRPC, WPF, XAML, unit testing, integration testing, XUnit, Moq, Git

Jun 2018 - Dec 2018

7 months

Architect / Lead Software Developer

Development of a central service for the automated generation and distribution of network configurations for a nationwide branch network
Migration of legacy mainframe data structures into maintainable C# logic
Processing of configuration data on Microsoft SQL Server to generate standardized network scripts and automatically roll out the configuration
Technical design, transfer of existing logic, and quality assurance using automated tests
Tech stack: IIS, ASP.NET, C#, Microsoft SQL Server, HP QC, TFS, NUnit, Autofac, Enterprise Architect 14

Nov 2017 - Jun 2018

8 months

Software Developer Frontend / Backend

Further development of a model-driven business software solution for municipal utilities and energy suppliers (electricity, gas, water)
Implementation of a graphical modeling interface for defining workflows, information flows, dialogs, and business logic
Coverage of the full process area from market communication via EDIFACT message exchange to tariff design and invoicing
Implementation of new features in the frontend and backend
Development of automated tests for quality assurance
Technology stack: Visual Studio, C#, ASP.NET MVC, WCF, PowerShell, UML/Enterprise Architect, Webmodeler, Fluent NHibernate, SQL Server, NUnit

Sep 2010 - Aug 2015

5 years

Software Developer and Tester, Scrum Master

Development of a base framework for laboratory devices for molecular and immunological diagnostics (fluorescence methods)
Implementation of core functions such as logging, settings, security (hashing algorithm for password management) and database migration
Conducting feasibility studies for new technologies (e.g. Entity Framework)
Building and maintaining automated integration and UI tests with full traceability to requirements and specifications according to IEC 62304
Conducting risk assessments and quality assurance measures
Introducing and further developing agile practices as Scrum Master in an international team
Technology stack: .NET Framework 4.0, Silverlight 4/5, C#, Entity Framework, WPF, WCF, TFS, Unity, MEF, Moq, MVVM, Enterprise Library, UML, SQL Server, Oracle

Industry experience

See where this freelancer has spent most of their professional time.

Experienced in Biotechnology, Healthcare, Energy, Information Technology, Manufacturing, and Utilities.

Biotechnology

Healthcare

Energy

Information Technology

Manufacturing

Utilities

Business area experience

See which departments and functions this freelancer has contributed to most.

Experienced in Product Development, Quality Assurance, Information Technology, and Project Management.

Product Development

Quality Assurance

Information Technology

Project Management

Skills

Main Focus

Agile Way Of Working (Scrum/Kanban) With A Focus On Ai Integration, Especially Microsoft Semantic Kernel And Llms.
Use Of Docker And Cloud Technologies (Azure, Hetzner) For Containerization And Deployment.
Design And Implementation Of Modular Architectures – From Classic Applications To Microservices With Cqrs.
Focus On Maintainable, Tested Code And End-To-End Test Automation (Unit And Integration Tests, Tdd).
Many Years Of Experience In C#/.Net Development – From Desktop Applications (Wpf, Maui) And Web Applications (Blazor) To Services And Automation Solutions.

Apis & Integration

Anthropic Api (Llm Connection)
Google Maps Api
Hetzner Cloud Api
Leaflet Api
Ocp Server Implementation For Visual Studio Code
Ocp Server Integration For Open Webui (Tool Server)
Openai Api (Llm Connection)

Architecture & Design Patterns

Cqrs
Clean Architecture
Dependency Injection
Factory
Ioc
Layered Architecture
Mvc
Mvvm
Microservices
Observer
Singleton

Industries

Automotive Suppliers (Automotive)
Energy Industry
Retail
Industry
Medical Technology
Public Administration

Build & Deployment Tools

Azure Devops Pipelines
Dotnet Cli
Github Actions
Gitlab Ci/Cd
Inno Setup
Install Shield
Msbuild
Wix Toolset

Com Technologies

Activex
Com/Dcom
Ocx
Ole

Databases

Intrabase / Firebird
Microsoft Sql Server
Mysql
Oracle
Postgres
Redis

Database Technologies

Ado, Dao, Odbc (Data Binding)
Entity Framework
Entity Framework Core
Sql / Transact Sql Server

Devops / Automation

Ansible
Azure
Github Actions Ci/Cd
Terraform / Tofu

Development Environments

Borland Delphi Studio
Visual Studio
Visual Studio Code

Frameworks

.Net
.Net Core
.Net Framework
Qt (Gui Development)
React (Javascript Framework)
Silverlight
Wpf / Xaml

Programming Languages

Batch / Shell Scripting
Delphi
Javascript
Nodejs
Pascal / Turbo Pascal
Powershell
Python
Rust
C
C#
C++

Interfaces

Opc (Open Platform Communication)

Other

Electronics And Circuit Design

Special Knowledge

Development Of Audiological Software For Configuring Digital Hearing Aids
Development Of Test Systems/Test Software For Electronic Assemblies And Amplifiers
Development Of Medical Technology Software
Standards Iec 62304:2006, Iso 9001:2000, Iso 13485:2003
Opc / Wind Turbines, Interface Development For Monitoring And Control
Opc – Interfaces For Wind Turbines (Enercon, Vestas, Senvion, Nordex, Siemens, Quantec)
Quality Management
Scrum Master Scrum Alliance
Implementation Of Adjustment Algorithms Nal-Nl1, Seewald Dsl, Fig6

Version Control

Git
Github
Svn

Virtualization

Docker / Compose
Hyper-V
Kubernetes
Portainer
Proxmox

Web Technologies & Standards

Ajax
Html
W3c Standards

Languages

German

Native

English

Advanced

Certifications & licenses

Scrum Master

Scrum Alliance

Statistics

Experience

Total positions 7

Experience in Biotechnology 5 y

Avg length 1 y 9 m

Longest experience 4 y 11 m

Expertise

Recent roles Fullstack Developer / Architect, Self-Study & Prototyping, Architect and Lead Developer

Main industries Biotechnology, Healthcare, Energy

Main business areas Product Development, Quality Assurance, Information Technology

Qualifications

Certifications earned 1

Profile

Member since

August 2025

Last update

August 2026

Need a freelancer? Find your match in seconds.

Try FRATCH GPT

Frequently asked questions

Have questions? Find more information here.

Heiko is based in Petershagen, Germany.

Heiko speaks the following languages: German (Native), English (Advanced).

Heiko has at least 12 years of experience. During this time, Heiko has worked in at least 7 different roles. The average length of individual experience is 2 years and 8 months. Note that Heiko may not have shared all experience and actually has more experience.

Based on recent experience, Heiko would be well-suited for roles such as: Fullstack Developer / Architect, Self-Study & Prototyping, Architect and Lead Developer.

Heiko's most recent position is Fullstack Developer / Architect.

Heiko is most experienced in industries like Biotechnology, Healthcare, and Energy. Heiko also has some experience in Information Technology, Manufacturing, and Utilities.

Heiko is most experienced in business areas like Product Development, Quality Assurance, and Information Technology. Heiko also has some experience in Project Management, Logistics, and Supply Chain Management.

Heiko has recently worked in industries like Energy, Information Technology, and Manufacturing.

Heiko has recently worked in business areas like Information Technology, Product Development, and Quality Assurance.

Heiko has 1 certificate: Scrum Master.

Heiko is immediately available for suitable projects.

Daily rate distribution

0 1 2 3 4

<€640 €640-800 €800-960 €960-1120 €1120+

The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.

Average rates for similar positions

Rates are based on recent contracts and do not include FRATCH margin.

1000

750

500

250

Daily rate avg. 807 €

The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.

1000

750

500

250

Median rate 812 €

The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.

Calculated based on our freelancers’ daily rates as of 24 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.