Charles Vilenczi

I am a seasoned product manager and solution architect with 15+ years of hands-on experience in building production-grade, high-performance data systems, including AI- and Data Science-driven platforms.​

My experience spans from leading data integration and data platform projects to designing data-intensive web applications and microservices. I’ve worked across data pipelines (ETL/ELT), scalable APIs (REST, GraphQL), and database design (relational, NoSQL, graph), with a focus on creating robust, cloud-native architectures.

I also advise on data governance strategies using frameworks such as ITIL v3, DAMA-DMBOK v2, ensuring alignment between business goals and technical delivery.

I am also skilled Google Cloud Platform (GCP) and Amazon Web Services (AWS) and have implemented cloud-based solutions at scale.

- Core skills:
Python, SQL, Golang, JavaScript, Java, SQL, Cypher, Dart
MLOps, CI/CD, Docker, Kubernetes
GCP, REST/GraphQL APIs, 
Kafka, Airflow, dbt, Spark, Neo4j

- Data governance & architectural consulting
What I bring:

Proven technical leadership with 7+ years in managerial roles
Deep understanding of both engineering execution and business value
Ability to deliver scalable, production-ready systems, on time and on target

I’m open to remote opportunities globally, where I can contribute both as a builder and strategic thinker.

Product Manager & AI Architect, VK-Data, s.r.o. (2024/08 – Present) : Overseeing the development of a Retrieval-Augmented Generation (RAG) system for a local insurance broker, involving PyTorch PoC models and Golang microservices. Technologies include Flutter, FastAPI, Qdrant, and OpenAI.

Consultancy, Booking.com (Amsterdam) (2023/04 – 2024/01) : Developed a comprehensive Python CLI tool and an R/Shiny application for process data mapping and monitoring during a major program overhaul. Technologies used: R, Shiny, FastAPI, and Kubernetes.

Senior Python Developer, Optum (Dublin) (2022/09 – 2023/04) : Integrated a Texas-based startup into the Optum system landscape. Stack included Python, Golang, Java, PostgreSQL, VueJS v3, GCP, and Apache Kafka.

Product Manager & Platform Architect, Deutsche Telekom / T-Systems (2017/12 – 2022/09) : Developed a graph-based causality analysis platform for telco infrastructure and migrated systems from Open Telekom Cloud to AWS. Utilized Neo4j, MongoDB, Python (FastAPI), and Amazon EKS.

Senior PM and Manager for Grid Analytics, E-On (former RWE AG / Innogy) (2016/08 – 2017/07) : Conducted market analysis for SCADA offerings and initiated data science projects using R and R Shiny.

Program Manager and Customer Engagement Designer, Red Hat UK (2015/11 – 2016/04) : Designed engagement programs to grow customer relationships from onboarding through subscription renewal.

Senior Project Manager and IT Architect, E-On (former RWE AG / Innogy) (2010/09 – 02/2013) : Managed a major process re-engineering project for grid operations to meet scaling and savings targets, reducing operational complexity by 30%.

Pre-sales Consultant and IT Specialist, IBM Consulting (2008/07 – 2010/04) : Served as a pre-sales advisor and business analyst for clients in the telecommunications, public, and financial sectors.

Network Engineer and Business Process Architect, Slovak Telekom (Deutsche Telekom) (2007/03 – 02/2008) : Designed and implemented Telco operations, leading a team of 15 consultants with a $0.6M budget.

Pre-sales Consultant and IT Specialist, EMM (2006/05 – 2007/02) : Designed monitoring and IDS / IPS solutions for telecommunication companies and financial institutions.

Network Management Specialist, McKinsey & Company (2005/09 – 2006/04) : Network engineering specialist involving round-the-clock operations

Visiting Scholarship, Emory University, Goizueta Business School (Atlanta, USA) (2015/12 – 2016/07) : Focused on supply chain, operations consulting, and process optimization.

Executive MBA, Operations Management Concentration, CEU Business School (Budapest, Hungary) (2013/03 – 2015/07) : Served as President of the CEU Consulting Club.

MSc. in Computer Science, Technical University of Košice (TUKE) (2000/08 – 2005/05) : Focused on computer networking and development.