Gabriel_h

Meticulous AI | Engineers (SWE, Platform, Forward Deployed), Founding AE | SF, London | On-site | Full-time

Meticulous is building the world's first fully autonomous and exhaustive testing platform for frontend codebases. Our system replays real user sessions against every pull request to catch regressions before they ship. Customers include Dropbox, Notion, Wiz, Wealthsimple, and LaunchDarkly. We're a small, high-talent team (ex-Google, GitHub, Meta, Palantir) with exceptional product-market fit and rapidly growing revenue.

Engineering

Forward Deployed Engineer (Senior) — SF / London — On-site $200k–$400k base / £150k–£300k base + significant equity Customer-facing + deep systems work; own deployments end-to-end

Platform Engineer (First hire) — London — On-site £150k–£300k base + significant equity Infra, reliability, scaling replay of thousands of sessions per PR

Sales

Founding Account Executive — San Francisco — On-site OTE $280k–$400k + equity, uncapped commission Inbound-heavy, mid-market to enterprise (ACVs $100k–$1m+)

Tech highlights: TypeScript, browser internals, distributed systems, cloud infra, deterministic execution See all jobs and apply: https://jobs.ashbyhq.com/meticulous

Interesting, AI needs much better guardrails and monitoring!

You may find this interesting too https://meticulous.ai/blog/let-users-write-tests-for-you/ r.e. e2e testing and automatically generating mocks for UI tests.

Maintaining mocks in e2e tests often becomes infeasible with a meaningful amount of e2e tests.

Hey HN, I'm Gabriel, founder of Meticulous (YC S21). Our mission is to make the world's code safe, performant and reliable.

We're starting with a tool to catch JavaScript regressions in web applications with zero-effort from developers.

How it works: Insert a single line of JavaScript onto your site, and we record thousands of real user sessions. We then replay these sessions on new code to automatically catch bugs before they hit production. You can watch a 60-second demo at https://www.meticulous.ai.

Catching JavaScript regressions is just the start. We are a London-based YC company. Our team previously worked at Dropbox, Opendoor and Google. We raised $4m, and are backed by some of the best founders and technical leaders in Silicon Valley, including Guillermo Rauch (founder Vercel, author next.js), Jason Warner (CTO GitHub), Scott Belsky (CPO Adobe), Calvin French-Owen (founder Segment), Jared Friedman (YC partner and former CTO of Scribd) and a bunch of other incredible folks.

You can read more at https://www.ycombinator.com/companies/meticulous/jobs/AkHpFa...

If interested please feel free to reach out to me at gabe at meticulous dot ai, with a few lines on what interests you about Meticulous and mention HN in the subject line.

It really depends on your use-case here.

If you’re able to spin up an environment via docker-compose and play against that with playwright, then I think that’s good for that use-case.

However, if you’re testing a flow that relies on some initial state, it can sometimes be tricky to seed that state or do so in a way which is representative.

It does not include SSE or WebSockets.

With regards to updating existing records, unfortunately we don't currently have good tooling & support for this, so you may need to record new sets of sessions as your application changes. I would suggest starting off with testing a few core flows.

One key difference is that with playwright you have to replay against some environment.

Meticulous captures network traffic at record-time and stubs in responses at replay-time, which removes the need for a backend environment to replay against. We also apply a little fuzziness in our replay, like how we pick and choose selectors (e.g. imagine css selectors with hashes in them, the 'same selector' will look very different between two builds).

We have a long way to go in making this robust though.

Is there anything you wish was easier when writing tests with Playwright?

That's really interesting. I'll take a deeper look at their pricing - thank you!

We are taking every scrap of luck we can get our hands on - thank you!

> Testim/QA Capture

Self-improving tests is a really interesting area. Timing is definitely an intricate issue. You probably have to layer on top of each other a bunch of different and novel techniques to get something with good signal-to-noise. We're still working on developing those out :)

Oooh, thank you for the rec. I'll make sure to ping Oren after the launch. The space is enormous and my understanding is that the rate of growth for testing tooling will exceed the rate of growth for software, which leaves QA and testing companies in a good position.

Ouch, that does sound like a painful cycle. It happens, and no one tests as much as they'd like to.

> Portability of the data.

I hear your concern here. The replay data and session data is also saved to disk, so you can save this somewhere. Of course that still leaves the risk of the record & replay tech. I think open sourcing this would solve the portability issue here, and it's something we're actively talking about but haven't reached a conclusion on yet. Anecdotes and examples like this though are incredibly helpful in helping us make that decision.

Thank you for the feedback!

Thank you for the wishes here! That is very kind of you.

> Open sourcing

Openreplay is awesome, but we ended up building heavily on top of rrweb (https://github.com/rrweb-io/rrweb). Did you know they have their own documentary on the project? I only noticed that today.

Thanks so much for this feedback here. You have exactly the right idea for the use case, and so we might need to scale up our replay thresholds here.

Meticulous | #2 Founding Engineer | London | Full-time | Onsite | Visa sponsorship available | £100k - £160k+, 0.5% - 3%+ ($150k - $900k+ equity)

Hey HN, I'm Gabriel, founder of Meticulous (YC S21). Our mission is to make the world's code safe, performant and reliable.

We're starting with a tool to catch JavaScript regressions in web applications with zero-effort from developers.

How it works: Insert a single line of JavaScript onto your site, and we record thousands of real user sessions. We then replay these sessions on new code to automatically catch bugs before they hit production. You can watch a 60-second demo at https://www.meticulous.ai.

Catching JavaScript regressions is just the start. We are a London-based YC company. Our team previously worked at Dropbox, Opendoor and Google. We just raised $4m, and are backed by some of the best founders and technical leaders in Silicon Valley, including Guillermo Rauch (founder Vercel, author next.js), Jason Warner (CTO GitHub), Scott Belsky (CPO Adobe), Calvin French-Owen (founder Segment), Jared Friedman (YC partner and former CTO of Scribd) and a bunch of other incredible folks.

You can read more at https://www.ycombinator.com/companies/meticulous/jobs/AkHpFa...

If interested please feel free to reach out to me at gabe at meticulous dot ai, with a few lines on what interests you about Meticulous and mention HN in the subject line.

Meticulous | #2 Founding Engineer | London | Full-time | Onsite | Visa sponsorship available | £100k - £150k+, 2%+

Hey HN, I'm Gabriel, founder of Meticulous (YC S21). Our mission is to make the world's code safe, performant and reliable.

We're starting with a tool to catch JavaScript regressions in web applications with zero-effort from developers.

How it works: Insert a single line of JavaScript onto your site, and we record thousands of real user sessions. We then replay these sessions on new code to automatically catch bugs before they hit production. You can watch a 60-second demo at https://www.meticulous.ai.

Catching JavaScript regressions is just the start. We are a London-based YC company. Our team previously worked at Dropbox, Opendoor and Google. We just raised $4m, and are backed by some of the best founders and technical leaders in Silicon Valley, including Guillermo Rauch (founder Vercel, author next.js), Jason Warner (CTO GitHub), Scott Belsky (CPO Adobe), Calvin French-Owen (founder Segment), Jared Friedman (YC partner and former CTO of Scribd) and a bunch of other incredible folks.

You can read more at https://www.ycombinator.com/companies/meticulous/jobs/AkHpFa...

If interested please feel free to reach me at gabe at meticulous dot ai, with a few lines on what interests you about Meticulous and mention HN in the subject line.

Meticulous | Founding Engineer | London | Full-time | Onsite | Visa sponsorship available | £100k - £150k, 2%+

Hey HN, I'm Gabriel, founder of Meticulous (YC S21). Our mission is to make the world's code safe, performant and reliable.

We're starting with a tool to catch JavaScript regressions in web applications with zero-effort from developers.

How it works: Insert a single line of JavaScript onto your site, and we record thousands of real user sessions. We then replay these sessions on new code to automatically catch bugs before they hit production. You can watch a 60-second demo at https://www.meticulous.ai.

Catching JavaScript regressions is just the start. We are a London-based YC company. We just raised $4m, and are backed by some of the best founders and technical leaders in Silicon Valley, including Guillermo Rauch (founder Vercel, author next.js), Jason Warner (CTO GitHub), Scott Belsky (CPO Adobe), Calvin French-Owen (founder Segment), Jared Friedman (YC partner and former CTO of Scribd) and a bunch of other incredible folks.

You can read more at https://www.ycombinator.com/companies/meticulous/jobs/AkHpFa...

If interested please feel free to reach me at gabe at meticulous dot ai, with a few lines on what interests you about Meticulous and mention HN in the subject line.

Meticulous | Founding Engineer | London | Full-time | Onsite | Visa sponsorship available | £100k - £145k, 2%+

Hey HN, I'm Gabriel, founder of Meticulous (YC S21). Our mission is to make the world's code safe, performant and reliable.

We're starting with a tool to catch JavaScript regressions in web applications with zero-effort from developers.

How it works: Insert a single line of JavaScript onto your site, and we record thousands of real user sessions. We then replay these sessions on new code to automatically catch bugs before they hit production. You can watch a 60-second demo at https://www.meticulous.ai.

Catching JavaScript regressions is just the start. We are a London-based YC company. We just raised $4m, and are backed by some of the best founders and technical leaders in Silicon Valley, including Guillermo Rauch (founder Vercel, author next.js), Jason Warner (CTO GitHub), Scott Belsky (CPO Adobe), Calvin French-Owen (founder Segment), Jared Friedman (YC partner and former CTO of Scribd) and a bunch of other incredible folks.

You can read more at https://www.ycombinator.com/companies/meticulous/jobs/AkHpFa...

If interested please feel free to reach me at gabe at meticulous dot ai, with a few lines on what interests you about Meticulous and mention HN in the subject line.

Meticulous | Founding Engineer | London | Full-time | Visa sponsorship available | £100k - £145k, 2%+

Hey HN, I'm Gabriel, founder of Meticulous (YC S21). Our mission is to make the world's code safe, performant and reliable.

We're starting with a tool to catch JavaScript regressions in web applications with zero-effort from developers.

How it works: Insert a single line of JavaScript onto your site, and we record thousands of real user sessions. We then replay these sessions on new code to automatically catch bugs before they hit production. You can watch a 60-second demo at https://www.meticulous.ai.

Catching JavaScript regressions is just the start. We are a London-based YC company. We just raised $4m, and are backed by some of the best founders and technical leaders in Silicon Valley, including Guillermo Rauch (founder Vercel, author next.js), Jason Warner (CTO GitHub), Scott Belsky (CPO Adobe), Calvin French-Owen (founder Segment), Jared Friedman (YC partner and former CTO of Scribd) and a bunch of other incredible folks.

You can read more at https://www.ycombinator.com/companies/meticulous/jobs/AkHpFa...

If interested please feel free to reach me at gabe at meticulous dot ai, with a few lines on what interests you about Meticulous and mention HN in the subject line.

Meticulous | Founding Engineer | London, Remote | Full-time | Visa sponsorship available | $140k-$200k, 2%+ equity

Hey HN, I'm Gabriel, founder of Meticulous (YC S21). Our mission is to make the world's code safe, performant and reliable.

We're starting with a tool to catch JavaScript regressions in web applications with zero-effort from developers.

How it works: Insert a single line of JavaScript onto your site, and we record thousands of real user sessions. We then replay these sessions on new code to automatically catch bugs before they hit production. You can watch a 60-second demo at https://www.meticulous.ai.

Catching JavaScript regressions is just the start. We are a London-based YC company and remote friendly. We just raised $4m, and are backed by some of the best founders and technical leaders in Silicon Valley, including Guillermo Rauch (founder Vercel, author next.js), Jason Warner (CTO GitHub), Scott Belsky (CPO Adobe), Calvin French-Owen (founder Segment), Jared Friedman (YC partner and ex-CTO of Scribd) and a bunch of other incredible folks.

You can read more at https://www.ycombinator.com/companies/meticulous/jobs/AkHpFa.... If interested please feel free to reach me at gabe at meticulous dot ai, with a few lines on what interests you about Meticulous and mention HN in the subject line.

This is such an important problem and a really interesting approach.

Hi Walter,

I'm a fellow founder based in SZ, it would be great to get in contact. Your Myanmar-focused financial services startup sounds interesting. I always try to meet anyone doing something I find interesting :)

Could you drop me an email at gabriel@moju.io? Any other HN readers based in SZ, also feel free to reach out :)

I have a few anecdotal examples of innovations or ways in which China is 'ahead':

Bike-sharing startups like MoBike: Use their app to find the nearest bike to you, scan a QR code to unlock it, and pay $0.15 for one hour. You can then ride and leave it anywhere. Admittedly, this is only possible due to v. high urban density (China has ten cities with populations greater than London and similar urban densities).

I can order a lot from the same app/interface: takeaway, cinema tickets, hotels, flights, KTV, etc. I find this more convenient than UK. Mobile payment penetration here is very high here too. Almost everyone pays for almost everything with WeChat.

Andrew Ng argues that AI progress in China is underreported due to the language barrier. I suspect this insight applies more generally to all the innovations happening here.

*https://www.theatlantic.com/technology/archive/2017/02/china...

Principles by Ray Dalio. My interpretation is that this book shows 'how to get what you want'.

That sounds so far up the chain of abstraction and generality, that it’s easy to dismiss the book. Don’t! The book is impressive partially because it manages to distill useful truths which are applicable at such a general level.

It's written by Ray Dalio, who is undoubtedly extraordinarily intelligent and remarkably determined to self-improve. He is the founder of the hedge fund Bridgewater Associates and consequently the 69th richest person in the world in 2015.

The firm itself is noted for it’s unique company culture. He believes that people can only improve through feedback and that there are strong social conventions and cognitive barriers which prevent people receiving the feedback they need. At Bridgewater, every meeting is recorded and broadcasted to the company. At any level in the company, if someone is being considered for a promotion, they will be invited for a discussion. Senior executives will discuss, in front of the candidate, the merits of whether to promote them or not.

The book contains elegant, simple, yet crucially important truths. They seem obvious at first sight, but he fleshes them out in such a way that you realise you don't really act consistently with those truths, even if you perhaps trick yourself into believing that you do. Through reading the book, you can internalise some of his approaches in understanding the world.

It’s a book which altered my way of thinking about the world in a profound way.

PDF link here: http://www.bwater.com/Uploads/FileManager/Principles/Bridgew...

"By nature, this system leads to capital accumulation. Since no capital is infinite, accumulation in one place means removing it from somewhere else."

I agree with the first sentence but the second assumes the economy is zero-sum. This is only true to a certain extent within some domains, like ownership of physical land.

Congratulations to the team at SwiftKey!

I know there's a high concentration of awesome engineering talent there. So I wonder whether this acquisition is primarily for the talent or for the potential monetisation opportunities?

Check out www.illustreets.co.uk (built in Meteor)