COEN DE WITH

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SELECTED WORKS

Car Import Margin Analyzer

AI-powered tool for calculating post-import margins and taxes for EU→NL car imports. Ingests 10M+ listings daily from 13 European countries, featuring ML-based pricing predictions and comprehensive P&L breakdowns.

ReactMLAIProxy CyclingWeb ScrapingData Science

AutoWaardes.nl

Code Live

Dutch car market analytics platform providing deep insights into pricing, depreciation rates, and market trends. Analyzes 485,000+ active car advertisements with real-time data visualization.

Next.jsPythonData Analytics

Cyrcl.App

Wireframe Live

In-person networking app that creates authentic connections through photo-verified interactions. Uses AWS Rekognition for real-time face matching at events, with a Flask backend handling image processing and face encoding. Features shared Memories galleries and secure messaging via Supabase.

React NativeExpoPythonFlaskAWS RekognitionSupabaseAWS

CreateMap.App

E-commerce platform for custom map posters. FastAPI backend with prettymapp for OpenStreetMap rendering, AWS Lambda for async HD map generation, Stripe checkout with multi-country payment methods, and Printify API integration for global print fulfillment.

ReactFastAPIStripePrintifyAWS LambdaAWS EC2DockerOpenStreetMap

FakeNewsQuiz.com

Live

Interactive quiz app that challenges users to distinguish real news from fake. Collects Snopes fact-checks on a daily basis (respecting rate limits and ToS) and turns them into engaging quizzes. Built with React and Supabase, features a leaderboard system and educational fact-checking links for each question.

ReactSupabasePythonWeb Scraping

FlitsApps.nl

Live

Price comparison tracker for Dutch quick grocery delivery apps (Flink, Getir, Gorillas). Monitored price drops and highlighted the best deals across platforms in real-time. Operated with strict adherence to rate limits and terms of service.

PythonData Collection PipelineWeb ScrapingNatural Language ProcessingAffiliate MarketingSEO

Competitor Market Modeling

Code

Predictive analytics model for Uber Eats market share estimation. Uses bias adjustment techniques and dataset alignment to model competitive positioning across different markets.

PythonPandasSeabornData Science

Weather Prediction Dashboard

Live

Real-time weather dashboard built with Google Sheets API. Displays hourly precipitation forecasts for major Dutch cities with color-coded visualization and automatic data updates.

Google Sheets APICronAWSPandas

Netherlands Precipitation Tracker

Code

Automated Python script for hourly collection and tracking of precipitation data across major Dutch cities. Integrates with Google Sheets for data storage and visualization with historical data support.

Python

EXPERIENCE

2022 -- Present

Strategy & Operations Manager - Marketplace Efficiency

Uber

Managed profit and loss for a €500M+ ARR business; set goals (OKRs) and built models for the main cost drivers.
Planned supply and courier availability for the Uber Eats launch in 50+ Dutch cities; kept delivery completion above ~98% while orders grew 6×.
Built automated data workflows (pipelines) in Python and SQL, plus Google Sheets dashboards that tracked service quality, spend, and fraud.
Designed operating processes to move couriers from freelance to employee status under new laws.

2021

Operations Coordinator

Uber

Led courier pay and bonus design; moved day-to-day execution to local teams with automated dashboards.
Built live demand and dispatch forecasts and ran special-event runbooks.
Trained the team in SQL and Python.

2020

Operations Analyst

Uber

Built SQL dashboards that tracked service quality, cost, and fraud.
Built scenarios for how courier supply changed with price, and used them to shape the 2020 budget.
Supported incident response during the first COVID-19 lockdowns.

EDUCATION

Rotterdam School of Management, Erasmus University

Master of Science (MSc), Innovation Management

GPA 8.3 - Cum Laude

University of Groningen

Bachelor of Science (BSc), Technology Management

GPA 7.5

GET IN TOUCH

Let's connect and discuss opportunities

cjjdew@gmail.com LinkedIn GitHub