Software Engineer · Prague

Machine Learning
& Audio Processing

I build intelligent systems — from fine-tuning LLMs and training audio models to deploying production ML pipelines. 7+ years of software engineering with a focus on bringing research to real-world applications.

Lukáš Starenko

Background

I started my career in .NET enterprise development — building CRM integrations, reporting systems, and Azure-hosted applications for clients in banking, automotive, and tourism.

Over time, I shifted toward machine learning. Today I work on LLM fine-tuning, transformer-based audio models, and ML classification tools. I'm also an active algorithmic trader, building prediction systems with FreqAI for crypto markets.

I write about my experiments on Medium and I'm always looking for interesting problems at the intersection of software engineering and machine learning.


What I focus on

ML & LLM Fine-tuning

Training and adapting large language models for specific domains. Local deployment and optimization for production use.

PyTorch Llama Mistral Qwen Transformers

Audio Processing

Audio ML pipelines — classification, speech recognition, speaker diarization. Transformer-based architectures for audio.

Whisper Wav2Vec2 HuBERT torchaudio librosa SpeechBrain

Backend & Cloud

Production-grade APIs and cloud infrastructure. Strong .NET ecosystem background with Azure services for ML deployment.

.NET Core Python FastAPI Azure Docker PostgreSQL

MLOps

End-to-end ML lifecycle — experiment tracking, model versioning, automated pipelines, and CI/CD for machine learning.

MLflow DVC Azure ML GitHub Actions CI/CD

Where I've worked

2024 — Present

ML Engineer

Freelance

Fine-tuning local LLMs for educational apps. ML classification tools for audio engineers. Conversational chatbots for Czech e-commerce.

LLMAudio MLPyTorchReact
2023 — 2024

.NET Developer

AIMTEC a.s.

Built a reporting SPA from scratch. Domain-driven design backend hosted on Azure.

C# .NETEF CoreAzure
2022 — 2023

Python Developer

Open-IT cz, s.r.o.

Tourism prediction app backend. NetLogo simulation integration with university researchers.

PythonDockerNetLogo
2021 — 2022

.NET Developer

ACMARK s.r.o.

Banking CRM integrations. Azure Functions, SSRS reports, MS Dynamics customization.

C# .NETMS DynamicsAzure Functions
2020 — 2021

.NET / Dynamics Developer

ORTEX spol. s r.o.

MS Dynamics CRM plugin development. Customer requirements analysis.

C# .NETMS Dynamics CRM
2018 — 2020

PHP / C# Developer

AUTMES

Attendance system in PHP/Nette. WinForms maintenance app in C#.

PHPC# .NET

Selected work

ML · Audio

Audio Processing Pipeline

ML classification tools for audio engineers using transformer-based models. Architecture experiments to improve production accuracy.

TransformersAudio MLClassification
ML · Education

English Teacher LLM

Fine-tuning local LLMs for an educational app for older adults. Recommendation algorithms and React frontend.

LlamaMistralFine-tuning
ML · Trading

Algorithmic Trading

4+ years building strategies with Freqtrade. GBDT models via FreqAI for crypto market prediction and automated decisions.

FreqAIGBDTPython
NLP · E-commerce

Czech E-shop Chatbot

Conversational chatbot for a Czech e-shop recommending products using a local LLM with optimized prompt engineering.

LLMPrompt Eng.Chatbot

Let's talk

Open to ML engineering roles, freelance projects, and interesting collaborations.