Jan 2022 – Jan 2024 · 2 yrs

• TravelPerk is the leading B2B travel management scaleup in Europe.

Sep 2021 – Present · 4 yrs 6 mos · Amsterdam, North Holland, Netherlands

• A weekly column with advice, observations, and inspiration across the software engineering industry. Especially relevant for software engineers and engineering managers at Big Tech and startups, useful for those working in tech.
• The #1 technology newsletter on Substack.
• Subscribe here:

Jul 2021 – Present · 4 yrs 8 mos

• mobile.dev solves this problem of needing to build in-house with a best-in-class platform. The platform already enables companies to catch performance problems pre-production, but this is just the first stepping stone. We have big plans on becoming the go-to toolkit for any team that cares about quality apps.
• We’re hiring for the first few founding engineers in the US - for Infrastructure, Android, and iOS Leads. Read more details on these in the first comment - feel free to message me if you have questions or are interested! https://angel.co/company/mobile-dev-inc/jobs

Oct 2020 – Present · 5 yrs 5 mos · Amsterdam, North Holland, Netherlands

• Writing The Software Engineer's Guidebook (https://www.engguidebook.com/). Published Mobile Apps at Scale (https://mobileatscale.com/), Growing as a Mobile Engineer (https://www.mobileatscale.com/growing) and The Tech Resume Inside Out (https://thetechresume.com).
• Building TechPays (http://techpays.com) to bring transparency to tech compensation in Europe.

Jan 2019 – Oct 2020 · 1 yr 9 mos

• Headed up Payments Experience Platform group, a cross-platform, backend, web, and native mobile group of about 25 engineers. Built Uber Wallet. Created the Web Payments team, who are building all next-generation experiences for paying for Uber products, across all web surfaces. Manager for Uber Pay towards the end of my tenure.
• Challenges included building and operating a payments platform processing $65B in 2019, scaling services to thousands of QPS, building an easy-enough to extend platform, having a magical UX that always works, and delivering more, and faster, while dealing with migration hell that is typical for a company in hypergrowth.

Jan 2017 – Jan 2019 · 2 yrs

• Making sure people can pay for their ride with Uber doesn't sound that exciting. Until you realize $2B+ is on the line every month, in 70+ countries, with more than a dozen payment methods.
• Worked with a nimble, cross-platform, backend/iOS/Android engineering team, growing from 5 to 15 people. We balanced building new ways to pay that often meant $100M+ in annual revenue and keeping everything running - without losing our sanity.
• Some of the things we launched this time were AMEX, Google Pay, Venmo, Brazil debit cards and iDEAL. And we somehow managed to find time to help rewrite the Driver app, do some interesting security-related work and made time to ship a few improvements initiated by people on the team - which added tens of millions to the bottom line.
• These were really fun times.

Jul 2016 – Jan 2017 · 6 mos

• Rewrote the Uber app, leading the payments features rewrite both on iOS & Android. We did what many engineers would advise against: started from scratch, bet on a new language without mature tooling support (Swift 2.2 at the time) and started over with a new architecture to be shared between iOS and Android (RIB architecture). We did of this in a hustle, with less than 6 months from the first line of code to shipping globally.
• We now have an app where a hundred different program teams and thousands of engineers can build quality features quickly and innovate within the app, without compromising the core experience and iOS and Android share the same code architecture, class names, business logic and platform components.

Jan 2015 – Jul 2016 · 1 yr 6 mos · London, United Kingdom

• Built Skyscanner TravelPro, a B2B travel product that we positioned to disrupt the way companies and people book their travel. I hired, built up & led the mobile team for this product, shipping the iOS app. We moved fast, built a polished MVP in 8 months, validated it with a few first active customers and iterated on the next version for the following 6 months. Ultimately, we did not have the right product-market fit and merged the learnings, team and product back into Skyscanner.

Jan 2012 – Jan 2015 · 3 yrs · London, United Kingdom

• Part of the founding team for Skype Xbox One, building it from the first line of code written to shipping to millions of people on launch day. Some interesting challenges included building a navigation framework for all controllers, voice, and gesture and performance challenges in resource-constrained scenarios.
• Afterwards joined the Skype Web team and built web.skype.com, a competitor to Google Hangouts at the time. Rolled out an earlier version of web calling to all 400 million Outlook.com users, implementing solutions to handle load a scalable way.

Jan 2011 – Jan 2012 · 1 yr · London, United Kingdom

• Built a market making product for the equity derivatives front office desk. This was the software that I shipped to the fewest people in my entire career (about 20 traders and marketers) but one that generated millions of dollars in daily revenue during heavy trading, facilitating money movements in the high hundreds of millions per day.

Jan 2010 – Jan 2013 · 3 yrs

• Built some of the highest-rated applications on Windows Phone like Cocktail Flow, Weather Flow and AppFlow in the evenings and weekends. Later ported Cocktail Flow to Windows 8, iOS, and Android together with Distinction where it is one of the most popular drinks apps (just search for "cocktail" on the app store). These apps had over 15M downloads and above 200K DAU at their peak.

Jan 2009 – Jan 2011 · 2 yrs · Edinburgh, United Kingdom

• Developed Visiblox from scratch. Visiblox is a high performance, multi platform (WPF, Silverlight, Windows Phone) and ridiculously extensible charting component. Customers included a large oil rig, an F1 team and financial companies.

Jan 2008 – Jan 2009 · 1 yr

• Built bespoke websites and software solutions for company clients.

Jan 2004 – Jan 2008 · 4 yrs

• Contracted part time building solutions using .NET, java, PHP, C and everything else I could get my hands on. My most memorable project was building a sensor system using an early RFID kit that shipped with no Windows drivers, leaving me no choice but to build one.