Heiko Huvermann - Fullstack Developer / Architect

Q: Where is Heiko based?

Heiko is based in Petershagen, Germany .

Q: What languages does Heiko speak?

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

Q: How many years of experience does Heiko have?

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.

Q: What is Heiko's latest experience?

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

Q: Which industries is Heiko most experienced in?

Heiko is most experienced in industries like Biotechnology , Healthcare , and Energy . Heiko also has some experience in Information Technology (IT) , Manufacturing , and Utility Services .

Q: Which business areas is Heiko most experienced in?

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

Q: Which industries has Heiko worked in recently?

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

Q: Which business areas has Heiko worked in recently?

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

Q: Does Heiko have any certificates?

Heiko has 1 certificate : Scrum Master .

Recommended expert

Petershagen, Germany

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 maintain inventory, plan requirements, and issue transport and order requests
Provision of a mobile MAUI app for field staff for material check-in and check-out with location-based photo documentation in map views
Control of all business logic through a central API
Technology 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 using 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 external warehouse 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 automated programming of tamper-proof fiscal data sticks with integrated SLE module
Built a scalable, testable architecture with CQRS and a modular printer plugin structure
Implementation of security-critical cryptography and production processes (PKI/OpenSSL)
Management of the production process from license number management through certificate creation to the deployment of firmware and configuration data on 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 development team
Technology 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 manufacturer-specific interfaces into a scalable system landscape
Design and implementation of a modular command agent for central remote control of wind turbines and performance regulation of entire wind farms
Development of configuration software for flexible adaptation to different manufacturer protocols
Successful rollout to production with licensing and internationalization perspective
Technology 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 automated generation and distribution of network configurations for a Germany-wide 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 automated rollout of the configuration
Technical design, migration of existing logic, and quality assurance through automated tests
Technology 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 commercial 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 entire process area from market communication through 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 like logging, settings, security (hashing algorithm for password management), and database migration
Conducting feasibility studies for new technologies (e.g. Entity Framework)
Setting up and maintaining automated integration and UI tests with full traceability to requirements and specifications according to IEC 62304
Performing risk assessments and quality assurance measures
Introducing and advancing 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

Industries Experience

See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.

Experienced in Biotechnology (5 years), Healthcare (5 years), Energy (4.5 years), Information Technology (2.5 years), Manufacturing (1.5 years), and Utilities (0.5 years).

Biotechnology

Healthcare

Energy

Information Technology

Manufacturing

Utilities

Business Areas Experience

The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.

Experienced in Product Development (12 years), Quality Assurance (7.5 years), Information Technology (7 years), and Project Management (5 years).

Product Development

Quality Assurance

Information Technology

Project Management

Skills

Areas Of Focus

Agile Workflow (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) Through Web Apps (Blazor) To Services And Automation Solutions.

Apis & Integration

Anthropic Api (Llm Integration)
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 Integration)

Architecture & Design Patterns

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

Industries

Automotive Suppliers (Automotive)
Energy Industry
Trade
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)

Miscellaneous

Electronics And Schematic Design

Special Skills

Development Of Audiological Software For Configuring Digital Hearing Aids
Development Of Test Systems/test Software For Electronic Assemblies And Amplifiers
Production Of Medical 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 Fitting Algorithms Nal-nl1, Seewald Dsl, Fig6

Versioning

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

Profile

Created

August 2025

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Frequently asked questions

Do you have questions? Here you can find further information.

Where is Heiko based?

Heiko is based in Petershagen, Germany.

What languages does Heiko speak?

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

How many years of experience does Heiko have?

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.

What roles would Heiko be best suited for?

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

What is Heiko's latest experience?

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

Which industries is Heiko most experienced in?

Heiko is most experienced in industries like Biotechnology, Healthcare, and Energy. Heiko also has some experience in Information Technology (IT), Manufacturing, and Utility Services.

Which business areas is Heiko most experienced in?

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

Which industries has Heiko worked in recently?

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

Which business areas has Heiko worked in recently?

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

Does Heiko have any certificates?

Heiko has 1 certificate: Scrum Master.

What is the availability of Heiko?

Heiko is immediately available for suitable projects.

What is the rate of Heiko?

Heiko's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.