radostyan.dev

Hi, I'm

Bertalan Radostyán

Data Scientist/Engineer

Currently working as a Data Engineer, with more than 7 years of relevant experience, supported by a strong academic background. Experienced across data science/engineering, machine/deep learning, software development, and AI engineering.

Email me GitHub LinkedIn ↓ Download CV

Experience

Data Engineer

Szallas Group — Budapest

May 2025 – Present
  • Architected and delivered an end-to-end data platform from concept to production.
  • Designed scalable batch and real-time data processing architecture, including CDC-based ingestion pipelines.
  • Led cloud infrastructure architecture and operations, covering provisioning, reliability, monitoring, and deployment environments.
  • Introduced and operationalized the use of AI (LLMs) across engineering workflows, design processes, and internal self-service tools.

Tech stack

Programming languages
PythonSQL
Data/ETL tools
dbtAirbyte
DevOps
DockerKubernetesGitLab CI
Cloud
GCPBigQueryGKEVertexAI

Data Scientist

Sanofi — Budapest

Nov 2023 – May 2025
  • Delivered end-to-end AI solutions for commercial use-cases in the pharmaceutical domain.
  • Developed and maintained a decision-support system for sales representatives to improve engagement with healthcare professionals.
  • Designed an AI assistant for pharmaceutical documents using LLMs, RAG, and knowledge graphs.

Tech stack

Programming languages
PythonSQL
ML tools/packages
Scikit-LearnTensorflowPandas
MLOps
MLFlow
AI/LLMs
LangChainNeo4j

Data Scientist

AutSoft Zrt. — Budapest

Feb 2019 – Oct 2023
  • Designed analytics schemas and built ETL pipelines feeding a centralised data warehouse and analytics platform.
  • Designed data lake architecture with real-time ingestion from multiple source systems; provisioned and operated Apache Kafka clusters on Kubernetes.
  • Automated banking system integrations and data processing workflows.
  • Developed forecasting models for product and energy consumption; built decision-support systems including customer segmentation and trading signal prediction.
  • Delivered Industry 4.0 ML solutions and created self-service BI reporting for business users.
  • Implemented OCR pipelines for ID and document recognition; developed algorithms for processing medical 3D scans.

Tech stack

Programming languages
PythonSQLC++
ML tools/packages
Scikit-LearnPyTorchTensorFlow
Other tools
Apache KafkaApache Spark
MLOps
MLflow
Cloud
AWS

Data Science Researcher

AutSoft Kft. — Budapest

Jun 2018 – Dec 2018
  • Predictive maintenance research in production line environments.
  • Tech stack: Apache Hadoop, Spark, Kafka · PyTorch (RNN, LSTM)

Software Developer

AutSoft Kft. — Budapest

Mar 2017 – Aug 2017
  • Full-stack and mobile development.
  • Tech stack: ASP.NET, Android, Node.js, Angular

Software Researcher and Developer

Budapest University of Technology and Economy — Budapest

Apr 2014 – Jun 2016
  • Educational software research and development.
  • Tech stack: ASP.NET, Android

Education

MSc in Computer Engineering

Budapest University of Technology and Economy

Sep 2017 – Jun 2019

Diploma thesis: Fast Data-based Production Support System

BSc in Computer Engineering

Budapest University of Technology and Economy

Sep 2013 – Jan 2017

Thesis: Adaptive Figural Abstraction Test with Generated Exercises

Skills

Data Engineering

ETL/ELT DesignCDC IngestionData ModelingData WarehousingData Lake ArchitectureReal-time PipelinesdbtAirbyteApache KafkaApache Spark

ML & AI

LLM ApplicationsRAG SystemsKnowledge GraphsComputer VisionForecastingSegmentationScikit-LearnPyTorchTensorFlowLangChainNeo4j

Cloud & DevOps

GCPAWSBigQueryVertexAIKubernetesDockerGitLab CIGrafanaPrometheusMLFlow

Programming

PythonSQLC#

Collaboration

Stakeholder communicationRequirement translationEstimationSolution design

Languages

English (C1)German (A2)Hungarian (native)

Contact

I'm open to new opportunities and interesting projects. Feel free to reach out.

✉ rad.bertalan@gmail.com ⌥ GitHub in LinkedIn

📍 Budapest, Hungary