Full-Stack Software Engineer

Software from idea to production.

I turn business requirements into maintainable software, working closely with customers and teams.

Explore success stories Contact

Success stories

Take ownership.
Create value.

Real problems, my approach and the results.

Success / 01

Improve quality

A shared understanding of software quality

A focus on testability, ease of change and architecture

Team | Knowledge sharing

Building a shared understanding of software quality

01
The team lacked a shared understanding of quality. Mixing different kinds of logic in large service methods made testing and changes difficult.
02
In internal talks, I explained object-oriented principles, composition and clearly separated application layers, alongside data processing with RxJS operators.
03
Team members reported a clearer understanding of software that is easy to test and change, and greater confidence in using RxJS.

Takeaway

Good software is a team effort. For me, technical leadership also means sharing knowledge, enabling others to make informed decisions and building team ownership of those decisions.

Success / 02

Confidential content

Protected by role-based access

Configurable for each customer

Authorisation | Architecture

Enforcing customer-specific access rules centrally

01
Caregivers, analysts and patients need different access rights to confidential content in a healthcare platform. Rules must be configurable per customer, and changes must take effect immediately.
02
I built the authorisation logic centrally on the server. Web and mobile clients use the actions allowed by the server, keeping rules consistent and avoiding duplicate maintenance.
03
Customer-specific access rules are enforced centrally. Changes take effect immediately on web and mobile, without a new app version or app store approval.

Takeaway

Understanding business needs and thinking them through helps translate them into the right technical solution. This creates value for stakeholders and a clean, maintainable foundation for engineering.

Success / 03

100+

Participants

In public online courses

Integration | Architecture

Integrating video conferencing providers with a modular design

01
A digital healthcare platform needed to integrate several video conferencing providers with different APIs and authentication methods.
02
I worked directly with the providers and independently implemented the integrations. The modular architecture makes it easy to add providers and activate them through configuration.
03
The platform enabled medical consultations and public online courses with over 100 participants; more providers can be added with little effort.

Takeaway

Clean architecture and thinking ahead pay off in stability and maintainability. Additional video conferencing providers can be integrated with little effort without disrupting existing integrations.

Success / 04

Performance+

A fraction of the original runtime

Through parallel processing

Performance | Analysis

Finding vehicle data in a fraction of the time

01
The customer waited too long for vehicle data: searches by vehicle identification number queried several systems sequentially.
02
I identified the sequential search as the bottleneck, parallelised it with Fork/Join and combined the results.
03
The customer received the requested vehicle data in a fraction of the original waiting time.

Takeaway

A system can work correctly and still frustrate its users. Excellent quality also means considering the user experience from the start.

Professional systems

Systems I have worked on.

A selection of real products and projects.

E-Health · ZTM

Digital care with Curafida

Modular platform for telemonitoring, teletherapy and digital rehabilitation, with tasks, learning materials, questionnaires and communication between patients and healthcare organisations.

Angular
Ionic
RxJS
NestJS
TypeScript
REST
REST Level 3
HATEOAS
TypeORM
PostgreSQL

Medical software · Apoplex Medical Technologies

Stroke diagnostics

ECG analysis microservice with a Web Components frontend for stroke diagnostics.

Java
TypeScript
Python
Web Components
Spring Boot
Flask
Gradle

Automotive · Novatec

International automotive platforms

Discount request escalation workflows across international markets, vehicle data visualisation and a REST API exposing vehicle data from Excel.

Java
Kotlin
TypeScript
JavaScript
Go
Spring Boot
Fork/Join
Node.js
Angular
React
Camunda
Liquibase
gRPC
Protocol Buffers
PostgreSQL
Jenkins
Kubernetes
Gradle
Ansible

Professional experience

Around seven years of engineering in complex domains.

From international automotive software to medical applications, I have developed and supported systems in production over several years. I care about how business needs, architecture, implementation and operations fit together.

01 2022–2025

Software Engineer · E-Health

Zentrum für Telemedizin (ZTM)

Full-stack development of an e-health platform for web, iOS and Android.

Shared responsibility for cloud and on-premises releases and production support; acted as the technical liaison between development, operations and domain experts. The platform was used in studies with several hundred participants.
Introduced code reviews and gave internal talks on Clean Code, RxJS and maintainable software development.

02 2022

Software Engineer · Medical software

Apoplex Medical Technologies GmbH

Development of medical software.

Developed an ECG analysis microservice with a frontend built on Web Components.

03 2017–2022

Software Engineer · Automotive

Novatec Consulting GmbH

Full-stack and DevOps engineering for international automotive projects, working directly with customers.

Promoted Domain-Driven Design and shared responsibility for the customer’s first successful agile project.
Took over an existing customer project from another service provider and independently continued its development, delivery and production operation.
Built and operated a Spring Boot service exposing vehicle data from Excel through a REST API.
Provided production support, investigated issues and delivered hotfixes; managed builds and deployments with Gradle, Jenkins, Kubernetes and Ansible.

Education

From mechanical engineering to software engineering.

B.Sc. Media Informatics
Kaiserslautern University of Applied Sciences · Zweibrücken campus

Apprenticeship as an industrial mechanic
Terex Cranes GmbH · Zweibrücken

Abitur · General university entrance qualification
Hofenfels-Gymnasium · Zweibrücken

Industry → Computer science → Automotive → E-Health

Further training

Scrum Master training Agile software development · 2019
Deep learning course Neural network fundamentals · 2022

How I work

My guiding principles.

Problem before technology

I question requirements and consider the people who use the system. Business needs guide the technical solution.

Causes, not symptoms

I break complex problems into manageable parts and investigate their causes across system boundaries. This leads to clear, testable solutions.

Ownership across system boundaries

User interfaces, business logic, data and infrastructure belong together. I see solutions through from implementation to running them in production.

Collaboration, not blame

I share knowledge, explain decisions and learn from mistakes with the team. This helps us make informed decisions and take shared ownership of our solutions.

Beyond the Job

My interest in software goes beyond my day job.

Personal projects give me room to explore technologies and make my own decisions. After launch, I keep improving them through user feedback and experience from running them.

Open Source · Android

Personal project · Open source

PlayOnDlna

Open-source Android app for DLNA streaming

I built PlayOnDlna to meet a personal need: a released open-source app that prepares media for different DLNA devices and controls playback. I manage releases and continue developing it in direct collaboration with users, addressing issues that only arise on real devices and networks.

Kotlin
Jetpack Compose
DLNA
UPnP
HTTP
FFmpeg
NewPipeExtractor
NanoHTTPD
SSDP
SOAP
AVTransport

Source on GitHub ↗ Get it on F-Droid ↗ Project website ↗

More personal projects

Mümmelmaus Motiviert!

Family app for Android and iOS with tasks, rewards and statistics. Includes family accounts across devices, QR-code sign-in, push notifications, Google and Apple sign-in, and premium features.

Flutter
Dart
NestJS
TypeScript
PostgreSQL
MikroORM
Firebase Cloud Messaging
RevenueCat

↗

Bubble Penetration

An Android game with rules I designed and my own backend service for a global leaderboard.

Android
Kotlin
TypeScript
Node.js
Express
PostgreSQL
Prisma

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Currently exploring

How is AI changing software engineering?

LLMs and coding agents are changing how software is built. Through personal experiments, I explore which tasks can be delegated effectively and where human engineering judgement remains essential.

I explore agentic workflows and tool use for codebase analysis, implementation, debugging and reviews. My focus is making this a reliable engineering process while retaining architectural understanding, domain-specific decision-making and responsibility.

Personal technical exploration outside my professional work to date.

Coding Agents

Agentic workflows for codebase analysis, implementation and refactoring.

Local LLMs

Running language models such as Gemma locally and exploring their use for specific tasks.

Tool Use & MCP

How models can work effectively with development tools and external systems.

Evaluation

Which combination of model and workflow produces verifiable, reliable results?

Away from the keyboard

Technology matters. There is more to life.

Family, nature, community involvement and time on my mountain bike are also part of my life. My partner, our three children and I support local conservation, participate in community-supported agriculture and are involved in a mountain biking club that helps develop sustainable trails.

Mountain biker jumping over a wooden ramp

Contact

Let’s talk engineering.

I am interested in challenging software products, complex domains and teams that value technical quality, ownership and curiosity.

Send an email ↗ GitHub ↗

lukasscheerer89@gmail.com