Senior Software Engineer / Software Architecture Consultant / Clean Code Trainer
Greetings!
My Name is Lars Jacobi, I am a seasoned Full Stack .NET Developer located in germany with over a decade of extensive experience in software development and architecture in safety-critical environments, specializing in clean code practices, long-term quality assurance and legacy code bases.
Currently, I am leading projects in safety critical environments like the medical and energy sectors.
Since November 2025, I have been working as a Staff Engineer at Auralis Group GmbH. I help clients across a range of industries overcome their technical challenges, drawing on my experience in software engineering and architecture. In parallel, I actively contribute to building and advancing Auralis's .NET practice.
Since October 2025, I have been working as a freelance software engineer alongside my employment. I develop individual software solutions for friends of mine who run their own small businesses.
In October 2024, Method Park Engineering GmbH, which was acquired by UL Solutions in 2021, was rebranded to UL Software Intensive Systems. I continued my work there as a specialist in software development for safety-critical environments until November 2025.
Afterwards, I have been working at Method Park as a specialist for software architecture and quality assurance, focusing on safety-critical environments such as the medical sector and energy technology.
I supported a construction industry company for just over a year in advancing their internal CRM and document management system.
After I successfully passed my exam, I continued working for the IT-Systemhaus for nearly 2 years, where I was responsible for the continuous development of a core service in master data management. In this role, I contributed to maintaining and enhancing essential data infrastructure systems while navigating the unique challenges of public sector software development.
I continued my apprenticeship at the IT-Systemhaus der Bundesagentur für Arbeit which is an agency in the public sector and currently maintains one of the largest IT infrastructures present in germany. I successfully passed my exams at 22nd of july 2015.
I started my professional carreer as apprentice at the H&S Heilig und Schubert InformationsManagement GmbH in September 2012 to become a Computer Science Expert in the Subject Area of Software Development.
Certification as CPSA‑F® is a valuable seal of approval for an internationally recognized training standard in software architecture and offers many advantages for professional development.
Requirements are crucial in all phases of development, which is why the CPRE qualification is aimed not only at requirements engineers. The ability to handle requirements professionally is a decisive advantage - whether in project management, business analysis, testing, UX and CX, or in software and system development. And regardless of whether you follow an agile or traditional approach.
C# / .NET
HTML
Java
Python
Flutter
C++
CSS
Javascript
Typescript
React
Git
Docker
Terraform
Windows
Linux
Visual Studio
VS Code
JetBrains Rider
Azure
JetBrains WebStorm
JetBrains PyCharm
JSON
XML
Markdown
SQL
Influx Db
Cosmos DbThese principles guide my work and professional relationships, shaped by my experience as a Clean Code trainer and software professional:
I am deeply committed to software quality. This means writing clean, maintainable, and robust code - without compromise. I firmly believe in "quality over quantity" and refuse to deliver subpar solutions.
I am passionate about empowering others through knowledge transfer. As an active member of the development community, I share my expertise in clean code practices and software craftsmanship through mentoring, training, and open exchange with peers.
I take pride in being a dependable partner who delivers on promises. My commitment goes beyond just writing code - it means being someone my clients and colleagues can truly rely on. I consistently deliver high-quality solutions while maintaining clear communication and meeting agreed deadlines.
I believe in building relationships based on mutual respect and trust. This means treating all stakeholders - clients, colleagues, and team members - with equal consideration and professional courtesy. My solutions aim to balance different interests while maintaining technical excellence and ethical standards.
Professional integrity and transparency are fundamental to my work ethic. While I actively support and implement practical solutions, I consider it my professional duty to protect stakeholders by speaking up clearly when proposals are unfeasible or potentially harmful. This includes having the courage to say 'no' when necessary, always providing clear reasoning and alternative suggestions where possible.
I believe that the best results emerge from an environment of shared learning and mutual support. By fostering open knowledge exchange and constructive feedback, I help create teams where everyone can develop their full potential. True excellence comes from growing and succeeding together, not in isolation.
Software development has gone through many phases in its evolutionary journey, continuously shaped by lessons learned. What measures has Microsoft incorporated from their wealth of experience into the new .NET Core development platform?
Method Park Holding AG takes a detailed look at Systems Engineering in this article. What is it really about, does it make sense for small projects, and what exactly does the SIMILAR process describe?
Legacy code often creates enormous challenges when developing new features: variables carry meaningless names, methods have mutated into overly complex constructs, and automated tests are minimal to non-existent. How do professionals deal with this?
The project aims to replace costly document-generation licensing currently used across hundreds of business tools with a centralized service. I contributed to evaluating solution options and research, and now independently lead the service's architecture, implementation, quality assurance, and containerized deployment. The service provides a central interface for populating forms with data, converting documents, and returning the generated output.
The project develops and maintains tools for a central appliance control unit, including a graphical editor for process engineering and code generators. My work includes extending the editor and generators, adapting generated-code integration for MATLAB Simulink through a new C++ interface, and enhancing a domain-specific language compiler, debugger, and communication libraries. I also create automated unit, module, and integration tests.
The project involves the technical leadership, architecture, and implementation of a new ERP application for managing the inbound and outbound flow of goods at a fruit producer. The platform is designed to integrate with an automated warehouse system in a later phase. I work with the team and end customer in an agile process to shape requirements, guide implementation within the established architecture, and review the work of less experienced developers.
The project focused on further developing a client-server platform for calibrating engine control unit datasets. I implemented new features in the WPF client, including AI-assisted process automation and a chatbot, integrations with xQTec and the build server, structured tracking of dataset changes, tools for creating subsets of large datasets, and automated comparison of large matrices. I also extended automated test suites and dataset analyses to help ensure the quality and stability of new functionality.
The project involved the further development of an expert tool for flashing engine control units. I developed a test framework to verify the backend REST API, extending automated coverage beyond the existing end-to-end tests through the WPF client. These API tests were an essential milestone and laid the groundwork for replacing the frontend independently of the backend in a future step. A particular challenge was testing endpoints that accept parameter files containing more than 60,000 parameters.
The project aims to efficiently support test engineers in certifying inverters according to the IEEE 1547 standard. For this purpose, a system is being developed that automatically executes and documents the tests defined in the standard. The system continuously communicates with available laboratory equipment through common communication standards such as Sunspec, enabling real-time monitoring of measurement data and test results. The visual data processing and compilation of test suites were initially prototyped in a Flutter-based client and subsequently implemented in Microsoft Blazor. My responsibilities within the project include requirements gathering and analysis, design and implementation of the software architecture, establishment and enforcement of code standards and software development processes, as well as supporting and coordinating developers involved in the project.
The objective of this project was to verify the customer's market claims regarding data security and privacy for their AI client application. A particular challenge was that the customer did not provide the source code, and the assessment had to be performed on a remotely accessible machine. As the lead developer, I was responsible for the conception and implementation of a toolkit that enabled the analysis of the application's inter-procedural communication flow. For this, I used Frida to inject JavaScript hooks into the AI client's Microsoft Named Pipes. This approach allowed for the identification of source and target processes and a seamless analysis of data transmission. In addition to technical leadership, my role included architectural design and software implementation. I ensured compliance with code standards and contributed significantly to the coordination and success of the entire development process, which led to me being awarded the UL Solutions CEO Mark of Excellence Award in 2025 for my work on this project.
A renowned medical device manufacturer required development support in transitioning their internally used tool chain to Azure. Specifically in risk management, two tools were needed. The first tool aims to export and convert data from the existing requirements analysis system (Calibre RM) for subsequent import into Azure. The second tool is designed to efficiently compare and validate existing requirement-specific data from neighboring systems. Both tools are implemented as local clients using Microsoft WPF, generating file-based input and output data. The data comparison tool also features a Git-like comparison window, enabling users to quickly and efficiently identify and correct differences. Each process is logged in detail, ensuring that every change remains traceable at all times.
For a manufacturer of software and hardware components for production facility automation (Smart Factories), both the development processes in use and the existing codebase were analyzed. Subsequently, a customized workshop focusing on software architecture and Clean Code standards was designed and conducted. Architects and developers were trained in common Clean Code practices and principles using real examples from their own code. Additionally, the agile methods in use were re-evaluated and unused practices were newly introduced to optimize the existing development process.
For a manufacturer of medical sensor products, a cloud-based data collection and reporting system was further developed. REST APIs were designed and implemented for a new mobile application (also developed by Method Park) for patients. The web application designed for medical personnel was enhanced to allow review of data from the mobile application, including graphical processing to assess recovery progress. Additionally, existing application functionality was revised and expanded. Partially outdated libraries and frameworks were updated. The existing database design was optimized to enable better integration with Entity Framework. The automated test coverage of the codebase was significantly increased, and CI/CD pipelines were established for quality assurance. Multiple test environments and production environments were deployed and managed using Terraform.
For a major automotive product manufacturer, during a migration to a new product version of IBM's Jazz platform, tools were developed specifically for configuring the internal Engineering Lifecycle Management (ELM) tool, enabling the creation and configuration of development-specific "lanes". These tools were implemented as local Java clients as requested. The official IBM REST interface was integrated, allowing the client to extend the feature set already implemented by IBM.
The project aimed to replace the dependency injection technology within one of the largest .NET applications in modern medical technology during ongoing operations. Activities included comprehensive information gathering, careful code analysis, and refactoring of existing code according to current Clean Code standards and automation of quality assurance.
The project was situated in medical technology at a renowned medical device manufacturer. The goal was to develop a new data analytics tool whose primary task involves anonymization, processing, and provision of large data volumes. Through careful code analysis and refactoring of a previously developed prototype, the final product was developed. During development, the system was continuously secured through automated tests and specially developed support tools. Additionally, agile methods such as code reviews and pair programming were introduced, which had previously been difficult to implement due to team size.
Software components were maintained within a comprehensive ERP system of a renowned construction service provider. The relevant software components are responsible for invoicing and other document-generating processes. The project's goal was the further development and maintenance of the system, as well as additional development support in requirements analysis and planning.
As part of a basic service within one of Germany's largest IT landscapes, an ERP master data management system was maintained, whose task is to link information about business locations with their organizational units. Activities included maintenance and further development of both the server-side architecture and the clients used as user interfaces. A special focus was placed on creating and maintaining barrier-free access to the clients. Additionally, an internal automated ticket system was developed, enabling users to be informed about significant changes in the underlying data and, if action is required, generating instructions and assistance for users. Besides the clients, a service connection via SOAP (Simple Object Access Protocol) was also provided.