I am a Senior Director of Software Engineering, with strong interests in algorithms, infrastructure, ecommerce, and organizational culture.

I work on ecommerce web at adidas.com in Amsterdam, Netherlands.

In my free time I hack on Sidenote, a web app to take timestampped notes on YouTube videos. And in a previous lifetime, I implemented KingDB, a fast on-disk persistent key-value store in C++17.

Get in touch: Blog | GitHub | LinkedIn | Email

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ARTICLES
Below is a selection of articles from my blog.
Crypto & Blockchain
Building a Payment System for the Ethereum Blockchain (Four-Part Article Series)
Algorithms and Infrastructure
How to implement an algorithm from a scientific paper
How to get started with infrastructure and distributed systems
Optimize your monitoring for decision-making
Management and Organizations
How Reliability and Product Teams Collaborate at Booking.com
Managing People: Avoiding The Reputation Trap
Autonomous Peer Learning at Booking.com and How You Can Do it in Your Organization
Coding for Solid State Drives
Part 1: Introduction and Table of Contents
Part 2: Architecture of an SSD and Benchmarking
Part 3: Pages, Blocks, and the Flash Translation Layer
Part 4: Advanced Functionalities and Internal Parallelism
Part 5: Access Patterns and System Optimizations
Part 6: A Summary – What every programmer should know about solid-state drives
Implementing a Key-Value Store
Table of Content
Part 1: What are key-value stores, and why implement one?
Part 2: Using existing key-value stores as models
Part 3: Comparative Analysis of the Architectures of Kyoto Cabinet and LevelDB
Part 4: API Design
Part 5: Hash table implementations
Part 6: Open-Addressing Hash Tables
Part 7: Optimizing Data Structures for SSDs
Part 8: Architecture of KingDB
Part 9: Data Format and Memory Management in KingDB
Part 10: High-Performance Networking: KingServer vs. Nginx
Hashing algorithms
Cuckoo hashing
Hopscotch hashing
Robin Hood hashing
Robin Hood hashing: backward-shift deletion