Valentin Cathelain, Developer in Mexico City, Mexico
Valentin is available for hire
Hire Valentin

Valentin Cathelain

Verified Expert  in Engineering

Bio

Valentin is a data engineer with over six years of experience building a diverse background in marketing technology and industrial scaleups. His expertise lies in building robust data warehouses and data pipelines from the ground up for mission-critical projects. Valentin continuously maintains high data quality standards, ensuring seamless data delivery.

Portfolio

Holistics Software
Data Build Tool (dbt), SQL, Pedagogy, Tech Sales, ETL, Data Pipelines, GitHub...
Freelance
Data Build Tool (dbt), Snowflake, Microsoft Power BI, Dagster, BigQuery, Hex...
InnovaFeed
Data Engineering, Snowflake, Azure, Matillion ETL for Redshift, Data Modeling...

Experience

Data Engineering - 5 yearsPython - 4 yearsData Modeling - 4 yearsSnowflake - 3 yearsData Build Tool (dbt) - 3 yearsBigQuery - 2 yearsDagster - 2 yearsMicrosoft Power BI - 2 years

Availability

Part-time

Preferred Environment

Data Build Tool (dbt), Pandas, Microsoft Power BI, SQL, Python, GitHub, Dagster, Snowflake, BigQuery, Matillion ETL for Redshift, Data Analysis, Business Intelligence (BI) Platforms

The most amazing...

...project I’ve led was a plant launch, for which I designed the data infrastructure from collection to visualization, with a 99% uptime SLA from launch.

Work Experience

Product Specialist

2024 - PRESENT
Holistics Software
  • Helped customers to implement modern data stack best practices.
  • Handled prospective jobs through insightful discovery calls and onboarding sessions.
  • Gave valuable insights and feedback to product teams, defining roadmaps and prioritizing features.
Technologies: Data Build Tool (dbt), SQL, Pedagogy, Tech Sales, ETL, Data Pipelines, GitHub, Data Engineering, Data Modeling, Data Visualization, Dashboards, Business Intelligence (BI), Dashboard Development, Google BigQuery, Google Cloud Platform (GCP), Data Warehousing, Stitch Data, Business Intelligence (BI) Platforms, Microsoft Excel, HubSpot

Data Engineering Consultant

2023 - PRESENT
Freelance
  • Developed a data visualization platform using Python and Hex to monitor data quality output from retrieval-augmented generation (RAG) for proactive issue identification and resolution.
  • Built a pipeline for an insurance company to extract data from XML files, leveraging data build tool (dbt), dbt macros, and Snowflake.
  • Optimized Microsoft Power BI dashboards by reworking the data model, reducing loading time by 70%.
Technologies: Data Build Tool (dbt), Snowflake, Microsoft Power BI, Dagster, BigQuery, Hex, XML, Retrieval-augmented Generation (RAG), ETL, Data Pipelines, Pandas, SQL, Python, GitHub, Global Project Management, Data Mining, Data Engineering, Data Modeling, Databases, Database Schema Design, Database Architecture, Database Design, DB, Data Visualization, Dashboards, Business Intelligence (BI), Dashboard Development, Web Crawlers, Amazon S3 (AWS S3), Machine Learning, Data Scraping, Web Scraping, Google BigQuery, Google Cloud Platform (GCP), Data Warehousing, Orchestration, Data Analysis, Data Analytics, Business Intelligence (BI) Platforms, Microsoft Excel, API Databases, Data Lake Design, API Integration, REST APIs

Data Engineer

2022 - 2023
InnovaFeed
  • Developed, maintained, and optimized data pipelines.
  • Led a critical data project for a major plant extension launch, collaborating closely with five cross-functional teams and increasing production values by ten.
  • Optimized Snowflake usage to reduce costs by 50% through best-practice orchestration.
  • Created impactful dashboards in Microsoft Power BI to monitor plant productivity, energy consumption, and sales operations.
Technologies: Data Engineering, Snowflake, Azure, Matillion ETL for Redshift, Data Modeling, Microsoft Power BI, ETL, Data Pipelines, Pandas, SQL, Python, GitHub, Global Project Management, Databases, Database Schema Design, Database Architecture, Database Design, DB, Data Visualization, Dashboards, Business Intelligence (BI), Dashboard Development, DAX, Microsoft Power Automate, Data Warehousing, Orchestration, Data Analytics, Business Intelligence (BI) Platforms, Microsoft Excel, API Databases, Microsoft SQL Server, Data Lake Design, API Integration, REST APIs

Product Analyst

2018 - 2021
Artur'In
  • Created impactful data visualizations for product, marketing, and customer success teams using Redash and other tools.
  • Built a data warehouse using PostgreSQL and a data build tool (dbt).
  • Monitored product performance, defined KPIs, and provided recommendations for optimization, increasing monthly active users (MAU) by 25%.
  • Delivered insights to the ads team, reducing costs per click by 40% on meta campaigns.
Technologies: SQL, PostgreSQL, Data Build Tool (dbt), Redash, ETL, Data Pipelines, Pandas, Python, Data Mining, Statistics, Data Engineering, Data Modeling, Databases, Database Design, DB, Data Visualization, Dashboards, Business Intelligence (BI), Dashboard Development, Machine Learning, Data Warehousing, Orchestration, Data Analysis, Data Analytics, Marketing Analytics, Business Intelligence (BI) Platforms, Microsoft Excel, Marketing Technology (MarTech), Google Tag Manager, Salesforce, Zapier

Quality Data Visualization for a Bike-sharing Service

https://medium.com/@valentin.cathelain.data/a-complete-analytics-engineering-project-visualize-a-bike-sharing-service-data-591f4e76e23c
This project is intended to empower citizens through transparent insights into Vélib, a bike-sharing service in Paris. I pulled data from the system's public API and loaded information into Google's BigQuery. Hex's powerful visualizations brought key metrics to life, allowing us to show critical information, including bike availability, maintenance responsiveness, and neighborhood usage patterns.
2012 - 2017

Engineer's Degree in Computer Engineering

University of Technology of Compiègne - Compiègne, France

DECEMBER 2023 - DECEMBER 2025

dbt Certified Developer

dbt Labs

Libraries/APIs

REST APIs, Pandas

Tools

Microsoft Power BI, Microsoft Excel, BigQuery, Matillion ETL for Redshift, Redash, Stitch Data, Zapier, GitHub

Languages

SQL, Python, Snowflake, XML

Paradigms

ETL, Business Intelligence (BI), Database Design

Platforms

Microsoft Power Automate, Google Cloud Platform (GCP), Hex, HubSpot, Azure, Salesforce

Storage

Data Pipelines, API Databases, Databases, PostgreSQL, Database Architecture, DB, Microsoft SQL Server, Data Lake Design, Amazon S3 (AWS S3)

Other

Data Build Tool (dbt), Data Engineering, Data Modeling, Data Visualization, Dashboards, Dashboard Development, Data Scraping, Web Scraping, Data Warehousing, Orchestration, Data Analysis, Data Analytics, Business Intelligence (BI) Platforms, API Integration, Data Mining, Global Project Management, Pedagogy, Database Schema Design, Web Crawlers, DAX, Google BigQuery, Marketing Analytics, Marketing Technology (MarTech), Dagster, Statistics, Tech Sales, Computer Engineering, Retrieval-augmented Generation (RAG), Machine Learning, Google Tag Manager

Collaboration That Works

How to Work with Toptal

Toptal matches you directly with global industry experts from our network in hours—not weeks or months.

1

Share your needs

Discuss your requirements and refine your scope in a call with a Toptal domain expert.
2

Choose your talent

Get a short list of expertly matched talent within 24 hours to review, interview, and choose from.
3

Start your risk-free talent trial

Work with your chosen talent on a trial basis for up to two weeks. Pay only if you decide to hire them.

Top talent is in high demand.

Start hiring