I lead mobile teams and make iOS apps.

iOS engineer turned engineering manager. I build apps in my spare time, some of them about maths, because I enjoy it.

now Engineering manager, mobile

building Prime Time & Bigger or Smaller, on the App Store

before that iOS engineer

and before that 14 years in credit risk

apps →

iPhone & Apple Watch

Prime Time

Is it prime? Decide, learn something about the number, and build the longest streak you can.

Download on the App Store support privacy accessibility

Prime Time asking whether 31 is prime, with Prime and Not prime buttons

A correct answer for 31, with the fact that 31 is a Mersenne prime

Game over screen showing a streak of 5 and a New Best badge

iPhone

Bigger or Smaller

Two maths expressions appear. Tap the one you think is bigger, then see the real values and why.

Download on the App Store support privacy

Bigger or Smaller asking which is bigger, 20 to the 5 or 5 to the 20

A correct answer for 5 to the 20, over 10 to the 7 times bigger than 20 to the 5

Streak summary showing a streak of 3 and a best streak of 14

about →

Fourteen years in credit risk, then a leap: I taught myself to code, went through Sky's Get into Tech programme and became an iOS engineer. Today I'm an engineering manager leading mobile teams.

More about me, and talks I've given

writing →

archive 2017–2023

Aug 2023 iOS ScrollView and make it snappy!
Aug 2023 iOS Simulator Screen Recording
Aug 2018 How to make a Command Line tool in Xcode
Aug 2018 Working with a forked git repo
May 2018 Understanding Map functions in Swift
Apr 2018 Xcode-select
Jan 2018 7 things I've learned so far as a junior developer
Dec 2017 Happy New Year!
Nov 2017 Dynamically adding css to WebViews in Swift
Nov 2017 24 hours with the iPhone X
Oct 2017 Hello world!