Jonas Templestein (@jonas) / X

Jonas Templestein

5,006 posts

Jonas Templestein

@jonas

CEO iterate.com, prev. cofounder/CTO Monzo, dad of three

iterate.com

Born July 3

Joined October 2009

Pinned
Jonas Templestein
@jonas
Jan 6, 2025
2025 will be the year we see the first self-driving startups. Level 0: No AI People do everything. They come up with ideas, build products, and run operations. Many legacy businesses still work this way. Level 1: People use AI tools ⬅︎ we are here People might use ChatGPT
76K
Jonas Templestein
@jonas
Dec 1, 2023
After almost 9 years, today is my last day at @monzo. I've written a bit about it here: monzo.com/blog/thank-you… 🩷🧡💛💚💙💜
Thank you, from our co-founder Jonas
From monzo.com
70K
Jonas Templestein
@jonas
Oct 21, 2024
Ten years ago I came to London to help @t_blom start a bank. I’m feeling very blessed about how it all went. @monzo is doing well, I’m settled down in beautiful the countryside with my wife and two kids and now working on something new that I love 🥰
22K
Jonas Templestein
@jonas
Apr 29, 2024
Article
Video of our AI coding agent building garple.com
Last week we launched garple.com, a side project that sells short, easy to say .com domains that would make good startup names. We had a blast making it (especially this song that...
220K
Jonas Templestein
@jonas
Feb 2, 2019
In a few years customers will expect all their transactions to be enriched in this way. We call it transaction “unfurling”
James Sherlock
@JamesSherlouk
Feb 1, 2019
Having a little bit too much fun with Monzo's new receipts API. (❤️ to @kieranmch and the team at @monzo cc @t_blom) Uses Gmail APIs to fetch emails, some logic to scrape known receipt formats & matching behaviour to push onto a Monzo TX.
Jonas Templestein
@jonas
May 21, 2020
I'm pleased to announce that this little nugget arrived safely a few weeks ago and we're totally smitten! @leahtemplewoman insists I'm the father but I'm not so sure... 👶
Jonas Templestein
@jonas
Jul 3, 2025
In my mind LLM "agents" are just event-driven programs (or as @karpathy would say "Software 3.0" programs) 1) They can receive new events (e.g. a "user message") 2) Some events trigger a "computation" (i.e. an LLM request) 3) This produces additional events (e.g. an "assistant
34K
Jonas Templestein
@jonas
Oct 24, 2025
Note to self: don’t go on a trip to SF when wifey is 35 weeks pregnant - even if your other two kids arrived after 42 weeks 🤣 Thankfully I made it back in time for the birth and bubba no3 arrived safe and sound 👶🥰
5.8K
Jonas Templestein
@jonas
Jun 15, 2025
What if Cloudflare bought bun and merged it with workerd? I realise this makes little technical sense, but as user I would love bun’s DX on cloudflare’s platform and I’d love to be able to use the same runtime my deployed code uses when writing scripts or in my test runner etc
24K
Jonas Templestein
@jonas
Jun 28, 2018
📢 I am delighted to announce that my longtime mentor and friend @Geek_Manager will be joining @monzo as CTO! I am super excited to finally get to work with her 🙌 I will take a broader executive role focusing on organisation design 🚀
Meri 8x💉“Exiled for Good of the Realm” Williams
@Geek_Manager
Jun 28, 2018
Hugely excited to share that I am joining @Monzo as CTO, with @jonas taking up a broader exec leadership role. I’m so delighted that I’ll get to work with him and lead this amazing team in such an exciting company 💪🏽🎉
Jonas Templestein
@jonas
Sep 5, 2025
I like cloudflare AND triangle man
5.1K
Jonas Templestein
@jonas
May 16, 2018
I'm so proud of the team for this. A few people got together and built this in their "Monzo time", which is time that is set aside for working on whatever you want
Supporting people to self-exclude from gambling
From monzo.com
Jonas Templestein
@jonas
Jan 28, 2025
Replying to @AravSrinivas
I was in a WhatsApp group called “Fintech AI founders” in London and nobody in it understood this 🤦
15K
Jonas Templestein
@jonas
Sep 3, 2021
👋 Hey folks, I'm looking for a chief of staff to help run Monzo's tech org. This is a great chance to get access to and influence the decision making in a growth stage, pre-IPO tech company. The job ad is here - I would appreciate any intros 🙏💖 DMs open
job-boards.greenhouse.io
Monzo
We’re building the best bank in the world - a bank you'd be proud to use - and that means bringing together a talented team with diverse experiences, backgrounds and skills. We believe there should...