Tom Blomfield

@t_blom90k followers

Member of Technical Staff at @anthropicai On leave from @ycombinator Cofounded @gocardless and @monzo

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1Feb 20, '25Grok 3 feels like talking with an adult. Claude is still lobotimized.121×2.4M6.4k423585
2Mar 30, '25Software engineers are highly-paid farmers, tending their crops by hand. We just invented the combine harvester. The world is going have a lot more food and a lot fewer farmers in 96×1.9M11k7542.8k
3Dec 29, '24The problem with Europe is that they’re unironically proud of this shit.87.3×1.7M13k671552
4Mar 10, '25Cursor blew my mind for about 3 days. Then it started getting confused as my codebase got larger. I switched to Windsurf 20 mins ago. It handled the larger codebase easily. Since t56.8×1.1M4.6k1422.6k
5Feb 21, '25I worry that "AI is going to make doctors/lawyers/whatever more effective" is just cope. It's only true over a 1-3 year time horizon. AI is going to steamroll all knowledge work in51×1M5.1k2421.1k
6Oct 11, '24Why doesn’t the UK have more startups? Capital is fixed, technical talent is world class, tax incentives are great, visas mostly fine, university IP problems seem like they’re gett47×925k4.5k4991.6k
7Oct 12, '25Hearing from a lot of good founders that AI tools are writing most of their code now. Software engineers orchestrate the AI. They are also finding it extremely hard to hire because45.4×893k2.9k154798
8Oct 22, '25I try to talk to Gen Z like they’re adults but they say lowkey in every other sentence and it makes me crazy.40.2×792k5.5k156318
9Nov 15, '24An uncomfortable truth: a small minority of people are dramatically smarter and more effective than average. Most folks have never seen these people operate first-hand. It's both a38.2×752k5.6k2741.5k
10Mar 2, '25It's shocking to see how badly the big tech companies are fumbling AI.36.8×724k9.5k174523
11Aug 4, '25Today is the deadline for the YC fall batch. It takes 30 minutes to write an application and could change the next 10 years of your life.36.7×722k72339139
12Nov 1, '24I feel like with a small team and 2-3 years, proven tech founders could automate huge chunks of the government. I would sign up for a tour of duty (in the UK). It would need a lot 35.5×698k2.2k112342
13Apr 17, '25I want an AI voice assistant that can interact with my email and calendar. It would let me catch up on admin during my 15 minute drive to work before the day really starts. Has any35.3×695k2.5k731.7k
14Nov 7, '25The "non-technical" CTO has a computer science degree and was a software engineer at Google.27.8×547k1.6k33286
15Mar 5, '25Before very long, we’re going to be able to give an LLM the login details to a complex SaaS application and the AI will clone it end-to-end. Plus import your data for free. My bet 27.5×542k3.1k1641.2k
16May 15, '25Imagine if Elon had just stuck with building rockets and self-driving cars and humanoid robots and brain implants. Top 5 human of all time. Instead he had to go and buy a social ne27.1×534k2.8k98185
17Nov 17, '24Taxing unrealized gains is bonkers. But accruing tax on unrealized gains makes a lot of sense. I built @monzo when I lived in the UK and accrued a lot of (paper) gains during that 25.9×510k2.5k115650
18Oct 24, '25It's so easy to be cynical and sound clever. Most startups fail, so the cynics are usually right. But the ones that succeed change the world. YC was the first investor in Starcloud24.6×484k88543135
19May 1, '25Season 7 of Silicon Valley24×473k5.8k181407
20May 20, '24Stanford and Berkeley students start companies at 5x the rate of Oxford and Cambridge. Why the smartest, most technical people in the UK should take more risk 🚀22.8×449k1.2k175672
21Apr 12, '19Hey @AskHalifaxBank 👋 It's great to see your updated brand identity, but it looks like you forgot to update couple of things. The card in the photo still displays the @monzo BIN (22.5×06.7k1.7k48
22Mar 10, '25I'm actually surprised that Claude Code didn't launch as a VS Code plugin. The terminal interface is pretty gnarly. Are there really no front-end devs at Anthropic?!20.4×401k8987166
23Nov 2, '25There's obviously some grade inflation going on, but I saw a fascinating trend at Oxford University over the last 80 years. Students in the 1950s had minimal pressure to do well; m19.8×391k1.9k41395
24Oct 8, '24These kinds of investor updates make me so angry. "Our revenue is still $0... so we've agreed a more aggressive hiring plan with [our lead VC] which will mean that we will be aroun18.6×367k90220164
25Jan 15, '25There is no doubt that I made bad DEI hires when I was running my company. It really happened. It was a massive mistake. But now, the number of talented black women in leadership p18.4×361k6891486
26Mar 19, '24I’ve noticed a pattern with some AI startups that are producing flashy demos with very low customer engagement. They are usually solving occasional problems. An example is “use nat17.1×337k1.1k83902
27Nov 13, '24I'm so impressed with @imperialcollege Ranked Number 2 in the world, overtaking Oxford and Cambridge. Their top graduates are coming out with useful degrees like Computer Science, 16.8×331k1.6k112282
28Jul 18, '25It's an open secret in the industry that the AI customer service tools with famous founders and hundreds of millions in funding are vaporware. Expect to see a bunch of companies an15.6×307k1.4k52627
29May 29, '25“I’ll invest if you find a lead” is the single lamest thing an investor can say.13.9×273k2.6k134248
30Jan 14, '25It's surprising just how quickly the "end of woke" and "down with DEI" has just transitioned into a legit resurgence of racists, homophobes and bigots.13.9×273k1.8k98159
31Jul 14, '25I get so many emails every day that it's becoming unmanageable. If I reply "no thanks", the sender tries to convince me otherwise. If I don't reply, I get a "just bumping this up" 13.4×264k1.7k28403
32Jan 31, '24Before I was 30 years old, I’d started 2 companies that are each now worth over a billion dollars. And it almost broke me. Here’s my story.13×257k95785829
33Nov 15, '23Here's an idea I wish someone would build: Mixpanel-style analytics for customer unit economics. At @monzo, we had an event-driven data architecture that allowed us to assign cost 12.9×254k96076839
34May 14, '24I’m halfway through a day of @ycombinator interviews and my whole body is tingling. Incredibly talented people are working on the most ambitious ideas I’ve ever seen. I don’t think12.5×245k1.4k127482
35Mar 1, '24When YC applicants write about why they’re not moving to SF to run their startup, it’s always because they firmly believe the strategically optimal place to base their company is t12.2×240k49914139
36Feb 4, '25🧑‍💻 Request for Design Partners 👩‍💻 At YC, I work with a number of highly technical young founders who can build mind-blowing stuff with the latest AI-based tools. But they don11.9×235k88259610
37Oct 31, '25I swear we’re gonna get AGI before reliable A/V setup11.7×230k1.2k3647
38Nov 15, '23I'm so annoyed by the parasitic "tech communities" in San Francisco that invite founders to join for "mentorship and advice". You sign a legal agreement, but they don't have any ob11.5×226k52444111
39Apr 24, '24Startups often struggle with naming. Early at @monzo, we had an ugly 12 month trademark dispute over “mondo”, our original name. So @jonas, my cofounder at @monzo, started a side p11.2×221k50131504
40Dec 30, '24I love USB-C. I used a Google Pixel for 5 years because it had USB-C. I only switched back to the iPhone when they moved to USB-C. But I have a problem with a regulator defining te11.2×220k1.6k7965
41Mar 14, '25RecipeNinja is an app I vibecoded in Windsurf. It took me about 20 hours over the last 2 weeks. I wrote zero lines of code. I am more convinced than ever that coding (and all knowl11.2×220k92351807
43Mar 30, '25RIP Tumblr 🪦 All-in, it cost me $15 in Claude credits and about 3 hours of my time to migrate off Tumblr and onto a custom blog. I am more and more convinced that people and compa10.0×196k94339509
44Mar 20, '24One of the bravest and most disciplined companies I’ve worked with sent investor updates every month with “$0 revenue” at the very top. They sent it consistently every month for mo9.7×191k90260410
45Nov 8, '24When was the last time someone tried running on the promise of extreme competence in government? I’m pretty fed up of the left vs right nonsense. I just want an effective, technocr9.3×183k1.4k35110
46Apr 2, '25New Blog Post: Are we entering an age of abundance? Technological progress is accelerating very rapidly and I don't think most people are prepared for that future. My bet is that t9.1×179k50648297
47Jul 18, '23I’ve never used a pitch deck to fundraise. Instead, I kicked off every raise by staring unblinkingly at the investor's right eye. They always blink first. Here's why I think founde9.0×177k5271697
48Nov 23, '24Seems like there are a lot of people in London who want to talk about startups8.8×174k1.7k75160
49Nov 1, '24Waymo is a dramatically better experience than Uber, but the wait times during peak hours make it unusable at those times. Surge pricing is a smart mechanism that increases Uber’s 8.8×173k8291372
50Jul 8, '24I have had bad tinnitus for the last 3 years. I scored around 75 on THI - it was pretty debilitating. I tried cutting out alcohol, caffeine, sleeping more - nothing really helped. 8.5×168k46115647
51Apr 25, '24I’m trying to figure out why so many startups are focusing on sales automation at the moment. At big companies, there are thousands of tedious, manual processes that are performed 8.3×163k49832321
52Oct 17, '24Trying to encourage people in the UK to start companies 🤷‍♂️8.2×161k95945171
53Jan 10, '25An common observation after week 1 of a new YC batch: Many companies have decided to tackle a problem that’s 10x more ambitious than their initial idea. Simply surrounding yourself8.0×157k1.1k75209
54Oct 10, '25Heard from a company in London: We have found the UK visa sponsorship process to be excellent - we’ve sponsored several visas for super talented engineers. Process takes jut a coup8.0×157k1.2k52241
55Nov 16, '23One of the best parts of the YC job is telephoning founders to tell them they've been accepted. The sheer excitement and emotion is inspiring.7.9×156k5131526
56May 20, '2460% of the companies I have funded so far for the Summer 24 batch of @ycombinator have European founders. They're working on some amazing stuff: 💻 Quantum computers 🍟 Energy effi7.7×152k62034158
57Nov 8, '24Humans are mimetic. Your peer group has an outsized impact on your mindset and aspirations. If you surround yourself with status-seekers and credentialists, you’ll aspire to get a 7.7×152k1.5k140629
58Oct 8, '24One of my most common pieces of b2b sales advice is "Don't sell to other startups". They are bad customers. Most of them don't know what they're doing. They don't have the same pro7.7×151k65046465
59Mar 16, '24Request for startups: I’d like an interactive voice based AI assistant that will help me go through my emails and calendar in the 20 minute drive to work. It should draft emails ba7.5×148k51526255
60Nov 23, '24The calm before the storm at @ycombinator Startup School in London. We’ve got 1200 of Europe’s top young programmers, designers and product people in attendance.7.3×144k1.1k64107
61May 28, '25This is going to kill "daily standups" and "status update" meetings, replacing entire layers of management at companies.7.0×137k69734581
62Jul 19, '24Michelle Obama for President with Barack as VP. A winning ticket.6.7×131k4831730
63Nov 6, '25There's a commercial landlord in San Francisco that is demanding veto rights on "merger, stock, or asset transfers" of a startup tenant. This seems totally insane. Why should the o6.4×127k6541351
64Feb 8, '23Not sure why I'm not having much luck dating at the moment 🤷‍♂️6.1×120k562420
65Apr 17, '24The best founders can describe in detail what they’ve built today and then clearly envision how it becomes a really big business in 10 years’ time. It’s essential to hold this micr5.2×102k53943353
66Dec 4, '24Plus a 7-10 stretch in jail.4.7×93k8153648
67Nov 12, '24Lots of early-stage companies get stuck between servicing mass-market SMBs and larger Enterprise customers, and it causes them a lot of pain. If you can sign Enterprise customers, 4.6×91k59933353
68Apr 29, '25When building AI tools for highly trained professionals like doctors and lawyers, it’s useful to give the user control of the system prompt. Letting users define how the agents wor4.4×86k49433336
70Apr 24, '25I’ve noticed that when founders fail at sales & marketing, it’s often because they’re cosplaying as a (bad) salesperson. Instead of asking themselves “what kind of message would I 4.3×85k59719239
71Oct 15, '21To make an investment in a German startup, I've had to use a notary to sign power of attorney, then send it to the Foreign and Commonwealth Office to be apostilled. Then wait 3-4 w4.3×01.4k151135
72May 1, '25It's weird how Twitter went from being very left-leaning to hardcore MAGA for about 12 months and has now reverted back to "no Trump is actually a moron".4.1×80k8882030
73May 10, '25Founders learning about fundraising by reading TechCrunch is like teenagers learning about sex by watching Pornhub.4.0×79k7072489
74Dec 17, '18People used say "no-one switches to a new bank". That stopped when @monzo hit a million customers Next came "but no-one's putting their salary in." In 2018, we've gone from 10% to 3.8×01.4k23518
75Oct 6, '25Someone asked me if I was going to sf tech week Dude, every week is tech week here 🤦‍♂️3.8×74k9763337
76Nov 24, '24Competition regulators are like a bunch of religious zealots trying to tell the rest of us how to live our lives based on their sacred texts. I like Google Chrome. I like Google se3.4×66k5653063
78Apr 3, '25Super useful trick when you're vibecoding any complex new piece of functionality. Get a reference implementation working in a standalone repo. Make sure its working & you're happy 2.9×56k48415461
79Oct 29, '25If government ministers can’t even keep track of the regulations, maybe it’s a sign the UK has too many of them?2.8×55k1.2k8522
80Oct 25, '24Unsubscribing from @LinkedIn email updates might be the most hostile UX I've ever experienced You have to click into each section to unsubscribe. Several sections have sub-sections2.3×45k5241635
81Mar 14, '19Parliament now agrees that: It doesn't want the deal It doesn't want no deal It doesn't want a second referendum I'm genuinely confused. What's left? 🤔2.1×07451181
82Dec 21, '24Unfortunately, I think the question that ChatGPT is actually answering is “what does Reddit collectively believe are the top 5 books a human should read.”2.0×40k4781123
83Aug 1, '22How Monzo grew to 1 million customers with ~zero marketing budget2.0×046771200
84Sep 7, '18At 8:08pm last night we declared a security incident @monzo regarding the @British_Airways breach. 11:07pm, we'd ordered 1300 replacement debit cards for customers who'd spent mone2.0×06881081
85Oct 1, '19Interesting comparison: @RevolutApp has 7m users and 1.1m daily actives. 16% @monzo has 3m users and 1.7m daily actives. 57%1.6×055710024
86Jan 20, '21I just finished my last all-hands and Q&A with the @monzo team. So many great memories and awesome team-mates. It's been a blast. I'm looking forward to some extended relaxatio1.5×0647288
87Jan 3, '19We will welcome 32 new joiners to @monzo this Monday. Last year on this day, there were 189 Monzonauts. We now have 654, 35% of whom work remotely 🚀 Interested in joining?1.3×0525517
89Mar 28, '18Every episode of Silicon Valley feels like a deeply uncomfortable parody of my startup life.1.2×0550470
90Jan 11, '19I'm so proud of this ❤️ @firstdirect's service has long been a source of inspiration at @monzo. To pip them for top place by 1% in our first year offering current accounts is an am1.1×0463523
93May 2, '19Some killer stats in this @YouGov article. 2% of Brits already have a @monzo account, despite only 11% of the nation having heard of the company. Net satisfaction score of +89 beat1.0×0417564
94Jul 21, '19If this banking thing doesn't work out, I'm going to become a potter.1.0×049995
95Jun 7, '19Using @monzo on the NYC subway!1.0×0458195
96Sep 15, '17After 18 years, I'm finally leaving Natwest. It's been emotional. 🚀💳 @monzo1.0×0424310
98Jun 13, '18Net Promoter Score just hit +80 at @monzo. Average across UK banks last year was +41.0×0388531
99Apr 3, '18I love it when @monzo customers write us nice letters 💌0.8×0387321
100May 6, '21A great day spent vaccinating people at the ExCel centre with @stjohnambulance0.8×042351

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