Thijs Koerselman
Software Engineer & Composer
I am a software engineer with a particular interest in sound, music, and audiovisual composition. I design and develop apps, tools, and algorithms for platforms, installations and live performances.
In 2026, I got an idea for a social no-media platform. I am extremely excited about it, so that will be my priority for the foreseeable future. Details will follow soon, so stay tuned!
Featured
- 2017.09nowStaffTraveler work
A platform for airline employees to check real-time seat availability on staff travel (non-rev) flights. The community-driven app has over 1.15 million members answering around 40,000 load requests daily. When I joined, we rebuilt the platform from scratch, and I was responsible for the business logic, backend, and infrastructure.
- 2019.052025.10Baymard Institute work
Baymard Institute conducts original large-scale UX research studies used by leading e-commerce companies worldwide. I developed their review tool for performing audits as well as internal tooling for constructing guidelines.
- 2026.02nowGCP Job Runner open-source
A CLI tool to run scripts locally or on Cloud Run with zero boilerplate. Define jobs using Zod schemas for validation and execute them across local and cloud environments.
- 2025.01nowTyped Firestore open-source
Typed abstractions for Firestore across server, React, and React Native. Define typed collection references once and have all functions automatically infer the correct types, with a thin wrapper around official Firebase SDKs.
- 2023.05nowIsolate Package open-source
Packages monorepo projects with their internal dependencies into a standalone directory ready for deployment. Generates deterministic lockfiles and supports multiple package managers.