// ex-Booking.com · ex-Meta · ex-IBM

Giel
Goudsmit

Tech veteran and senior Apple platform engineer. Three decades of software, from IBM to Booking.com and Meta; now building for iOS, macOS and visionOS, and putting AI to work inside it.

Get in touchCareer


years building software
30+
15 years, from Bookings.nl to global scale
Booking.com
Instagram & Facebook Messenger
Meta
Enterprise apps from scratch
DNA

// 01 · focus

What I work on

iOS

iOS

Native iPhone and iPad apps in Swift and SwiftUI, from the first prototype to millions of users. Earlier: Objective-C, C++ and C at Meta and Booking.com.

MAC

macOS

Mac apps that feel at home: menu bar utilities, background agents and the system integrations that make them disappear into the workflow.

XR

visionOS

Spatial computing for Apple Vision Pro: windows, volumes and immersive spaces built with SwiftUI and RealityKit.

LLM

AI & LLMs

Putting large language models to work in real products: agents, tool use and on-device intelligence on Apple platforms.

// 02 · career

Thirty years, one trace

Backend, web, infrastructure and mobile, at scale and at startups: Perl and MySQL at Booking.com, Go on AWS, Objective-C and C++ at Meta, and Swift and SwiftUI ever since they arrived. Strategy and hands-on code, with a bias for robustness once the prototype proves the idea.

  1. 2025 —

    DNA.incLead iOS Engineer

    Leading the consumer iOS app for a large international conference with around 45,000 attendees, built on the client's backend services.

  2. 2022 — 2025

    MetaiOS Software Engineer

    Messenger's video and group calling and Instagram's messaging on iOS, in Objective-C, C++ and C.

  3. 2018 — 2022

    Local HeroesSenior Architect & iOS Lead, co-founder

    Rebuilt the app in SwiftUI and Combine and cut it from 180 MB to 15 MB, added an 8 MB App Clip with Apple Pay and Wallet passes, and modernised the backend.

  4. 2018 — 2022

    CareibuTechnical Director

    Hired and coached the engineering team of a care-services marketplace, and led its move from PHP and Angular to Go with native iOS and Android apps on AWS.

  5. 2004 — 2018

    Booking.comSenior Developer

    Fifteen years from Bookings.nl to Booking.com: payments, scaling destination search with Elasticsearch, contact-centre platforms and destination search in the iPhone and iPad app. Also team lead, technical product owner and corporate culture advisor.

  6. 2000 — 2003

    MagicMindsDeveloper, then CTO

    Websites for De Telegraaf, Feyenoord and the Staatsloterij, then CTO of the technology spin-off.

  7. 1996 — 1999

    IBM NetherlandsIT Specialist

    One of a team of three running IBM's internal Windows 95 and OS/2 Warp employee platforms.

  8. 1994 — 1996

    Hervormd Lyceum ZuidIT Teacher & System Administrator

    Where it started: teaching IT and running the school's systems while studying informatics at the University of Amsterdam.

// 03 · projects

Things I've made

// 04 · contact

Get in touch

Building something for Apple platforms, or with AI? Lead iOS, architecture or a hands-on prototype: I'd like to hear about it.

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