I Build Profitable Software That Scales.
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What I Build.
Mobile Development
I have been a senior mobile developer for over 7 years. I have built apps for some of the biggest brands and most exciting startups in the world.
Quantitative Finance
I have a passion for quantitative finance. This is the hobby that really keeps my brain sharp. The math involved is more complex than anything I come across in mobile development.
Web Apps
I got sick of waiting for app store reviews, rules and approvals. Web apps allow me to test new features faster and get feedback from users sooner.
My Portfolio.
Innovative payments app for VISA.
VISA reached out to me as a specialist in cross-platform mobile development. I built a prototype of a new payments app for VISA that allowed users to pay using modern payment methods. I also helped architect the Paris 2024 Olympics app sponsored by VISA.
Cryptocurrency payment platform in Africa.
Mara is the number one cryptocurrency payment platform in Africa. It allows users to pay for goods and services using cryptocurrency. It is a fintech company that is focused on making it easy for people to pay.
Plans meals and orders groceries from your favourite supermarket.
Cherrypick is a food delivery app that allows users to plan meals and order groceries from their favourite supermarket. It is a food delivery company that is focused on making it easy for people to shop.
What Clients Say.
"Jonjo came in at Cherrypick as our second contract Flutter engineer and was instrumental in shipping the first version of our app on mobile - our app would simply not be where it is today without him. He has a very strong growth mindset and always looking to improve himself. He's receptive to feedback and is great to get along with. You'd be lucky to work with him!."
"Jonjo is a highly professional developer and it’s been a pleasure to work him. He takes his job seriously and thinks through different solutions looking for the most efficient one. All the features we've released while working together were implemented incredibly well. Also, Jonjo is easy to talk to so we’ve never had any communications problems. Hope we’ll have a chance to work on the same project again!"
"It has been a pleasure to work with Jonjo and the team. They were very flexible with their approach and walked us through a variety of options based on budget and future scope. They really know how to scale solutions and we felt in safe hands from day 1. Would highly recommend the team and I look fwd to working with them again."
"What an amazing guy to work with! Super driven, committed to the project and inventive with aspirations to create an app of the highest quality that going to help change people’s lives."
From shipping mobile apps to testing trading algorithms, I document how real systems are built. Expect clear thinking on software, markets, and quantitative ideas — minus hype, fluff, and "get rich quick" nonsense.