30.05.2026 aktualisiert

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ML Engineer für LLMs, Fine-Tuning, TTS/STT & Computer Vision (PyTorch, TensorFlow)

Berlin, Deutschland
Weltweit
Diplom Informatiker
Berlin, Deutschland
Weltweit
Diplom Informatiker

Profilanlagen

Curriculum Vitae 2026-05-30 ML.pdf

Über mich

Machine Learning Engineer mit Fokus auf PyTorch, TensorFlow, Keras, LLMs/SLMs, Fine-Tuning, LoRA, TTS/STT und Computer Vision (u. a. SSD). Erfahrung mit Transformers, vLLM, Docker, Kubernetes, RAG. Entwickle agentenbasierte Systeme mit LangChain/LangGraph. React/TypeScript-Experte.

Skills

JavaJavaScriptAPIsKünstliche IntelligenzData AnalysisComputer VisionC++Cloud ComputingCUDAContinuous IntegrationDestillationDjangoEmbedded C++PythonPostgreSQLMachine LearningNumPyOpenCVTensorFlowAzure Machine LearningNext.jsTransformerStreamingTypeScriptSpracherkennungGrafikprozessorAngular MaterialPyTorchReact.jsFlaskLarge Language ModelsMulti-Agent SystemsApache SparkSalesforce LightningSpring BootDeep LearningKerasFastAPIKubernetesHuggingFaceAWS Data AnalyticsGraphQLMachine Learning OperationsReact NativeSprachsyntheseDockerDatabricks
Ich bin Machine Learning Engineer mit über 10 Jahren Erfahrung in der Entwicklung produktiver Software- und ML-Systeme – von verteilten Architekturen bis hin zu modernen LLM-basierten Anwendungen. Mein Fokus liegt auf Deep Learning mit PyTorch, TensorFlow und Keras sowie auf der Entwicklung, dem Fine-Tuning und dem Deployment von Large Language Models (LLMs) und Small Language Models (SLMs) für produktive Umgebungen.

Ich arbeite regelmäßig mit Transformers, Hugging Face (Transformers, Datasets, PEFT), LoRA, QLoRA, Axolotl, Unsloth, vLLM, llama.cpp und quantisierten Modellen (FP16, BF16, FP8, INT8, GGUF). Meine Schwerpunkte umfassen Supervised Fine-Tuning (SFT), Instruction-Tuning, Distillation, Dataset-Augmentation, RAG-Architekturen (Retrieval Augmented Generation), Embeddings, Vektor-Datenbanken (z. B. pgvector, HNSW), Evaluierung (Precision, Recall, F1, Perplexity) sowie Performance-Optimierung auf GPUs (CUDA, A100, Mixed Precision, Gradient Checkpointing).

Im Bereich Speech AI arbeite ich mit Text-to-Speech (TTS) und Speech-to-Text (STT), einschließlich Fine-Tuning von Sprachmodellen, Alignment, Audio-Preprocessing, Feature-Extraktion (Mel-Spectrogramme) und Streaming-Inferenz. Zudem entwickle ich multimodale Systeme im Bereich Computer Vision, u. a. mit OpenCV, CNNs und SSD (Single Shot Detector), und kombiniere Bild-, Text- und Audiodaten in integrierten ML-Pipelines.

Ich entwickle skalierbare Trainings- und Inferenzpipelines mit Python, PyTorch Lightning, Docker, Kubernetes, RunPod, GPU-Clustern sowie REST- und OpenAI-kompatiblen APIs. Deployment erfolgt über containerisierte Umgebungen, vLLM-Server oder Edge-Setups unter Berücksichtigung von MLOps-Best-Practices, Reproduzierbarkeit, Modellversionierung und Monitoring.

Darüber hinaus entwickle ich mit LangChain und LangGraph agentenbasierte, zustandsbehaftete Systeme sowie komplexe, verteilte Multi-Agent-Architekturen. Neben meiner ML-Expertise bin ich sehr erfahren in React und TypeScript und Mitglied des Programmkomitees der React Advanced London Konferenz, wo ich aktuelle Trends rund um moderne Web- und KI-Systeme mitgestalte.

Mein Ziel ist es, leistungsfähige, effiziente und produktionsreife ML-Systeme zu entwickeln – von der Datenaufbereitung über das Fine-Tuning bis zur skalierbaren Bereitstellung von LLM-, TTS- und multimodalen Modellen.


Erfahrung

Berufserfahrungmehr als 10 Jahre
Freelancer seit2012

Sprachen

DeutschMutterspracheEnglischverhandlungssicher

Projekthistorie

Software Engineer

Vattenfall Energy Trading GmbH
based projects (PLAC, Opera and Agent) in the field of renewable energy.

Technology Java EE 6 and Spring 4.x, Oracle, Java Swing (GUI), Git, Ma- ven, Jira, CI with Jenkins.
Address Vattenfall Energy Trading GmbH
Dammtorstraße 29-32
20354 Hamburg

Senior React Native Engineer

SAP SE
- Project: German Government - KulturPass

Part of a small dedicated Team of Software Engineers working on the architecture and
implementation of the KulturPass React Native mobile App, as announced here:
https://www.bundesregierung.de/breg-de/aktuelles/kulturpass-2142398
Find more about the project here: https://www.kulturpass.de/

This project has been developed, released and enrolled to hundred of thousands end users only
within a period of six months.

The project has been open sourced on GitHub: https://github.com/kulturpass-de/kulturpass-app

Technology React, ReactNative, Android, iOS, TypeScript
Address Dietmar-Hopp-Allee 16
69190 Walldorf
https://www.sap.com/

Fullstack Software Engineer

Deutsche Post IT Services (Berlin) GmbH /DHL
The PCT is a tool to determine customs duties for products that are to be delivered across national
borders using a machine learning model. The user has the possibility to perform a direct
classification, an interactive classification or a manual classification.

The PLAPP is a mobile app for Android and iOS, built with React Native. PLAPP is an app for managing
deliveries in and across small to medium sized package stores and warehouses.

Technology PCT: React, TypeScript, Spring Boot, NodeJs, Kotlin,
PLAPP: React Native, Swift and Kotlin for native modules.
ML: Python, TensorFlow, Keras, Pandas, ...
Address Ehrenbergstraße 11-14, 10245 Berlin

Software Engineer

SAP SE
Working as a Fullstack Software Engineer on the Ruum Project https://www.ruumapp.com/. Ruum is
a tool for collaboratively planning, organising and executing work efficiently.

Technology Angular, React/ Redux, NgRx, NodeJs, Postgres, Kubernetes, ...
Address Rosenthaler Str. 38, 10178 Berlin, Deutschland
https://www.ruumapp.com/

Frontend Software Engineer

Senacor Solutions AG
Working as a Frontend Software Engineer on the new Online Banking Platform for the
L andesbank Berlin (L BB).


Technology Angular, NodeJs, Twitter Bootstrap 4.x, SCSS, GIT, Kubernetes, Docker
Address Litfaßplatz 2, 10178 Berlin, Deutschland




https://senacor.com/

Angular, Polymer and Spring Boot Software Engineer

QiO Technologies L imited
Working as a Frontend Developer on a Project for the Rolls-Royce Group (classified).


Technology Spring Boot and Angular, Polymer, Stencil, Camunda BPM, MongoDB, Kubernetes
Address Abbey House
282 Farnborough Road
Farnborough, Hampshire
https://qio.io

Angular and Spring Boot Software Engineer

Dr. Klein
Privatkunden AG / Hypoport AG working on a new Version of https://www.vergleich.de/

Working as a Frontend L ead Developer on a new Version of https://www.vergleich.de


Technology Spring Boot and Angular, npm, GIT, Jasmine, Karma, SCSS
Address Klosterstr. 71
10179 Berlin

Fullstack developer

Vattenfall; Vattenfall Europe Information Services GmbH
Angular, JavaScript, Spring Boot, UX (Sketch)

The Customer of this Project is Stromnetz Berlin, the Project Lead is Vattenfall. My main focus is the
Frontend Development of the Zählermontageportal (ZMP) and Beschwerdeportal. Together with an
external UX Company (Elbformat) we create the User Experience. My special focus is the creation of
so-called "Design Components" (in Angular) and a shared library that can be reused across different
platforms. I am part of a Scrum team which is working across borders (Germany and Poland).

Technology Spring Boot and Angular, NodeJs, GIT, Sketch, Illustrator, Jasmine, Karma, SCSS
Address Vattenfall Europe Information Services GmbH
Kopenhagener Straße 83 - 101, 13158 Berlin Pankow Wilhelmsruh

Senior Java EE Backend Software Engineer

Visono GmbH
In this project I work with a small agile team on a Media Asset Management System with clients like
Bild.de, Presse- und Informationsamt der Bundesregierung, ARD Mediathek, Saturn/ Mediamarkt
and many others. My role in this project is to support the Backend Team (Java EE) to implement new
features and prepare a new release.

Technology Java 8, Tomcat, CDI, ElasticSearch, IntelliJ, Git and GitHub
Address Visono GmbH
Schönhauser Allee 10/11, 10119 Berlin




https://visono4media.de/

Senior Android Software Engineer

T-Systems MMS GmbH; T-Systems Multimedia Solutions GmbH
I am working together with a T-Systems MMS team on the native Android and iOS M-Commerce
Apps for the fashion company s.Oliver. My role is to build the Android App, to write an ahead
specification for the iOS developers and to align with the Backend team concerning the API.

Technology Android SDK, Android Studio, RxJava 2, Dagger 2, Retrofit, ...
Address T-Systems Multimedia Solutions GmbH
Riesaer Str. 5, 01129 Dresden
https://www.t-systems-mms.com/

Senior Angular Software Engineer

Gesellschaft zur Verwertung von L eistungsschutzrechten mbH (GVL ); Gesellschaft zur Verwertung von Leistungsschutzrechten mbH
The GVL is one of the biggest collective management organisations for neighbouring rights in Europe.
I have been working as an Angular Software Engineer on the Artist Portal Artsys 2 which is a
complete rebuild of the old Artsys Artist Portal using a complete new technology stack based on
Angular 2.X. Another side project was the internal Verify Platform where new business processes
have been introduced.

Technology Angular 2, AngularJs, RxJs, Webpack, HTML5, CSS3, Sass, NodeJs, npm, ...
Address Gesellschaft zur Verwertung von Leistungsschutzrechten mbH
Podbielskiallee 64
14195 Berlin
https://www.gvl.de/

Senior Android Software Engineer

Minodes GmbH
Minodes' business model is focused on delivering clear so-what messages to help retailers optimise
operations and marketing activities. I have been working on the so-called Android In-App SDK. The
In-App SDK can be integrated in the merchant's mobile applications in order to use Minodes services.

Technology Android SDK, Android Studio, Google Play Services (especially Geo Fencing), ...
Address Minodes GmbH
Friedrichstraße 224
10969 Berlin
https://www.minodes.com/de/

React-Native and Angular Software Engineer

Project A Ventures GmbH & Co KG; Project A Services GmbH & Co. KG
Project A Ventures is an early-stage fund investing in entrepreneurs in the fields of e-commerce &
marketplaces, infrastructure & data and software as a service. A team of experts in Berlin and São
Paulo helps them build great companies. Evaluating technologies for potential ventures. These
projects include native mobile applications as well as hybrid apps and single page applications (SPA)
using cutting edge technologies.

Technology Android SDK, Android Studio, Angular 2, TypeScript, JavaScript (ES6), Bootstrap 4
(preview), React Native (React for mobile), NativeScript (Angular 2 for mobile),
Google Play Service, Swagger, ...
Address Project A Services GmbH & Co. KG
Julie-Wolfthorn-Straße 1
10115 Berlin
https://www.project-a.com/en

Senior Java EE and Spring Software Engineer

BillPay GmbH
Senior Java Spring (and web) Software Engineer working on BillPays backend in a small agile team.
BillPay GmbH is a successful Fintech company with clients like BMW's DriveNow or Eventim.

Technology Java EE 6 and Spring 4.x, Postgres incl. plpgsql, Angular 1.4, jQuery, Subversion,
Maven, Jira, CI with Jenkins.
Address BillPay GmbH
Zinnowitzer Str. 1
D-10115 Berlin

Java EE and Spring Software Engineer

Vattenfall Energy Trading GmbH

Android Software Engineer

Payleven GmbH
Projects: Android Application (a mobile payment application) and the Payleven In-App SDK as well as
on a myTaxi like demo Application for the In-App SDK. The Payleven Application in the Google Play
Store: https://play.google.com/store/apps/details?id=de.payleven.androidphone

Technology Android SDK, Android Studio, Gradle, DI with Squares Dagger, Google Guava,




Adyen In-App SDK, CI with Jenkins
Address Payleven GmbH
Pappelallee 78/80
10437 Berlin
https://payleven.de/mobile/

Android Software Engineer

Two Bulls GmbH
Seven Skills early Stage App and the Tuete2Go prototype.
The Sportsbet App: http://www.sportsbet.com.au/mobile/android
The Seven Skills App: http://www.sevenskills.de/

Technology Android SDK, Android Studio, Gradle, CI with Jenkins, AngularJs, Apache Cordova.
Address Two Bulls GmbH
Kurfü rstendamm 175
10707 Berlin
http://twobulls.com/de

Software Engineer

iSAtech GmbH
Leading Software Engineer responsible for creating the complete iSAtech software system.

Projects:
* iSAtech Water Keyserver - Server for creating and managing cryptographic keys, system images. The
Keyserver aggregates major parts of the companies business intelligence (BI).
* iSAtech Water Contingent Manager (CM-Client) - Client software for end users. The CM-Client is a
Java based GUI application for managing the data on the connected PoS-T (custom hardware).
* iSAtech Water Contingent Server (CM-Server) - Server software for the end users infrastructure. The
CM-Server provides the backend for multiple CM-Clients.
* FTDIIO - A general library for bridging (connecting) hardware based on FTDI chips with Java
applications.
* Model View Generator - A framework for Java code generation. Generates Java code (output) based
on annotated source code and configuration files (input) using Abstract Syntax Trees.

Technology Java Enterprise Edition: Glassfish, EJB 3.1, JPA/Eclipselkink, Java Server Faces, Tomcat
JavaScript: AngularJs, Socket.io, Nodejs
RESTful Webservices, Postgres
Address iSAtech GmbH
Alt-Moabit 59
10555 Berlin - Germany
https://www.isatech.de/

Research Associate

Deutsches Zentrum für L uft
European Train Control System (ETCS) Test- and Simulation framework
The ETCS is a signalling, control and train protection system designed to replace the many
incompatible safety systems currently used by European railways, especially on high- speed lines. The
Framework automates Testcases by running a constraint based simulation.

Software Developer

iSAtech GmbH
Projects:
* iSAtech Water Keyserver - Server for creating and managing cryptographic keys, system images. The
Keyserver aggregates major parts of the companies business intelligence (BI).
* Requirements Engineering and IT infrastructure for the newly created Software Department of
iSAtech Water GmbH as foundation for the CM-Client, CM-Server, Keyserver software systems.

Technology Java Enterprise Edition: Glassfish, EJB 3.1, JPA/Eclipselkink, Java Server Faces, Tomcat
JavaScript: AngularJs, Socket.io, Nodejs
RESTful Webservices, Postgres
Address iSAtech GmbH
Alt-Moabit 59
10555 Berlin - Germany
https://www.isatech.de/

Software Engineer

IT SERVICE OMIKRON (ITSO); ITSO GmbH
ITSO GmbH is a spin-off of the Fraunhofer Gesellschaft and is a Software Engineering company. I
started as a Student Worker (Werkstudent) working on a big project from the public sector in the
Quality Assurance (QA) department. After a while I moved to the Software Engineering team which
works on the Visite product family.

Projects:
* www.hochschulstart.de is an application portal for courses of studies with local
admission-restriction. In this portal you can find which courses are offered in this service procedure,
manage your applications and get the actual status for your applications. More information about
dialogue-oriented service procedure at www.hochschulstart.de/dosv.




* Visite is a product family of the web- and constraint solver based systems Visite Verwaltung, Visite
Besucher and Visite Abgeordnete. All three subsystems interoperate with each other and were
created with the special requirements of the Deutscher Bundestag in mind. The product
family was designed and implemented using the complete Java Enterprise Edition technology stack, a
custom constraint solver, a distributed REST based architecture considering the special security
concerns of the Deutscher Bundestag.

Technology Java Enterprise Edition: Glassfish, EJB 3.1, JPA/Eclipselkink, Java Server Faces,
Tomcat, Struts, Spring, JavaScript, jQuery, Postgres
Address ITSO GmbH
Mohrenstraße 63
10117 Berlin - Germany
http://www.itso-berlin.de/

Open Source


Uboot.io |Project on GitHub: https://github.com/uboot-io/uboot

Uboot is a delightful distributed Messaging and State Management for JavaScript
and TypeScript. The goal is to give an elegant and lightweight alternative for typical
component communication. Currently I'm working on improving the documentation ,
examples , middleware concepts , React, Angular and Vue bindings.


KulturPass: App (as part of the SAP SE) |Project on GitHub:
https://github.com/kulturpass-de/kulturpass-app

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