// Senior iOS developer @ Trainline

Code, coffee, and apps that bug you (politely).

I'm Petter — a Senior iOS Developer at Trainline, where I led our adoption of iOS 26 & Liquid Glass, launching in partnership with Apple. Off the clock, I design and ship my own apps in Swift.

View my apps →

Swift Objective-C SwiftUI UIKit Combine Async/Await SPM Clean Architecture

Petter.swift

struct Developer {
  let name = "Petter Vang Brakalsvalet"
  let role = "Senior iOS Developer"
  let company = "Trainline"
  let origin = "Hardware Tech"
  let learning = true // always
  let apps = ["reHydrate", "GuestLens"]
}▍

01 — apps

Things I've shipped

GuestLens

coming soon

Host an event and see it through your guests' eyes — everyone's photos and videos in one shared gallery. Coming to the App Store.

SwiftSwiftUIAsync/Await

Learn more →

reHydrate

open source

A simple water tracker built to (gently) annoy you into drinking enough water. Live on the App Store.

SwiftUINotificationsHealthKit

Learn more →

View all apps →

02 — about

From circuit boards to Swift

My path hasn't been a straight line. I started out fixing hardware at InfoCare in Norway — diagnosing and repairing PCs, phones and watches — which is where the debugging habit took hold.

That curiosity led me to a BSc in Computer Science at Aberystwyth University in Wales, and from there into iOS. I shipped reHydrate to the App Store, led iOS at Sonin App Development, and today build the Trainline app — used by millions of travellers across the UK and Europe.

~/now

buildingGuestLens 📸

working atTrainline

learningSwift Concurrency

based inUnited Kingdom 🇬🇧

03 — writing

Notes from the editor

Occasional write-ups on Swift, indie dev, and shipping side projects.

✍️ Coming soon

04 — work

Experience

git log --author=petter

commit 7f3a91c (HEAD -> main)

Date: 2023 — present

iOS Software Engineer · Trainline (Senior 2024–, Mid 2023–24)

Own our CI/CD & release infrastructure. Led the iOS 26 + Liquid Glass adoption with Apple, built the Bodyless & Headless test frameworks and a regression-bisect tool, and cut PR feedback by 20 minutes.

commit b2c8e40

Date: 2021 — 2023

Tech Lead iOS · Sonin App Development (Tech Lead 2022–23, Junior 2021–22)

Lead developer across the iOS portfolio. Designed a feature-based modular architecture, set the team's tooling standards, and mentored developers into "Project Champions".

commit a1d5f02

Date: 2013 — 2020

Computer Technician · InfoCare (Norway)

Diagnosed and repaired PCs, tablets, phones and watches in three languages — where the debugging habit began.

05 — contact

Let's build something.

Got an idea, a role, or just want to talk Swift? My inbox and DMs are open.

Email me → GitHub LinkedIn App Store