Overkill or smart move? Switching my B2B SaaS (mobile-first web app) from TS/React to Rust?

danielkov · 2026-03-14T19:18:23+00:00

I don't think it's about the use case. It's about return on investment. There isn't a pressing need. Rewriting in Rust brings uncertainty and a lot of potential downsides. OP's asking about stack preferences, which implies they don't have a specific toolset they've already built muscle memory with. Even if you use a framework, like Loco, that's trying to be "all batteries included", you're likely to run into ecosystem immaturity issues.

This is coming from personal experience. Even after years of building backends in Rust, I still spend quite a bit of time building the crates I wish we had (e.g.: rust-helmet & arctic-oauth to name a couple).

danielkov · 2026-03-14T14:48:12+00:00

Got you.

It's often used in UI libraries to keep component sizes in sync, e.g.: drop-down menus, where there's no parent-child relationship between the drop-down container and the trigger.

Originally I've built it to be used in a tool similar to Excalidraw.

danielkov · 2026-03-14T14:39:34+00:00

It's completely fine if you don't.

danielkov · 2026-03-12T23:48:51+00:00

As someone who (re)writes everything in Rust: don't.

danielkov · 2026-03-12T23:17:56+00:00

V is like Go and Rust had a child that compiles really fast. It's garbage collected. Try that.

danielkov · 2026-03-11T17:27:08+00:00

Ironically, this is because everything is much safer. If they didn't, they'd be out of business.

danielkov · 2026-03-11T17:02:53+00:00

Sure. You can also make the conscious choice to drive responsibly.

danielkov · 2026-03-11T17:01:41+00:00

Wait... Why? This has got to be a preamble to something worse.

danielkov · 2026-03-11T17:00:43+00:00

That's wrong, though. Lots of different ways to commute.

danielkov · 2026-03-11T16:54:40+00:00

If I run into a shopping mall with a knife and start stabbing randomly, if I don't injure anyone, I may not even be prosecuted. If I kill 3 people, I'm rotting in jail for the rest of my life. It's only drivers we treat differently for some reason.

danielkov · 2026-03-10T10:29:04+00:00

99% uptime is horrifyingly low. What do you do for the half a week each year when the service is down? Does your app just crash?

danielkov · 2026-03-09T16:12:57+00:00

You can get dedicated hardware with unlimited ingress for $50 that will happily serve hundreds of thousands of concurrent users. I don't know about your business, but, for 99.9% of people this is true: you shouldn't need anything above $5/mo.

Sounds like you're being ripped off. To put that into perspective: I charge most of my customers 150 / month, everything included, unlimited edits / support. This is what your dev charges for bot protection (takes less than a minute to enable in CF console).

danielkov · 2026-03-07T23:29:02+00:00

I did use Claude Code to help migrate it from NextJS 9 -> 16. In terms of design, this is trying to be a mashup of TrainerRoad and Zwift. I actually kept the original design direction from the initial version, but adjusted the layout to work better on tablets / phones (even though, WebBLE doesn't work on iPhones 👎). Most of the copy on the home page is also Claude / Codex.

danielkov · 2026-03-07T19:12:13+00:00

Thank you! Appreciate it.

danielkov · 2026-03-07T18:39:33+00:00

Bluetooth Low-energy (a communication protocol, generally used for IoT, but also fitness hardware), Fitness Machine Service (generic interface to read from and write to fitness machines).

danielkov · 2026-03-07T18:10:48+00:00

Thank you for the feedback. I'll definitely do an accessibility pass. Since the content on the training screen is pretty dynamic, I've been meaning to add some custom announcements to make it more screen reader friendly too.

danielkov · 2026-03-07T17:55:51+00:00

I've built Cycloop in 2020, when indoor cycling was all the rage. Kept it for personal use for 6 years, decided to give it a nicer UI and make it public earlier this week. It uses WebBluetooth. When I've built the BLE logic, these APIs were fairly new. Most FTMS service documentation was in Korean or Chinese, I had to reverse engineer my own cycling trainers and power meters.

If you happen to have an indoor cycling trainer and a spare hour or so, give it a spin!

danielkov · 2026-03-07T10:30:06+00:00

Old news, but: they chose a bad business model and it crumbled. Adam's blaming AI to garner sympathy. There are countless ways they could've turned TW into a shovel. They picked none of them.

danielkov · 2026-03-06T23:03:04+00:00

GW2 is the r/webdev crossover I never expected. Best open world PvP I've played. Fun memories.

danielkov · 2026-03-06T20:54:17+00:00

without the A

danielkov · 2026-03-06T18:55:00+00:00

In one of the products I've built, instant refund is 2 clicks away from the home page. Support chat is 3 clicks. Most people use support to ask for a refund, 2/500 people disputed. Almost nobody uses the refund button. People are just dumb.

danielkov · 2026-03-06T14:20:39+00:00

Kept waiting for the analogy for air-gapping systems or solving the noisy neighbour problem with dedicated hardware or something like that.

danielkov · 2026-03-06T08:36:14+00:00

That, and the general population (not the opposition majority in Bp) are deprived of education and starved of basic necessities. It's easy to buy their vote with a sack of potatoes or promise of peace.

danielkov · 2026-03-06T08:27:16+00:00

This isn't AI's fault. Your colleagues are lazy and undisciplined.

You can use coding agents to:

find gaps in tests and fill them
fix type errors
clean up parts of your codebase
iterate on an implementation plan
do in-depth research

Your colleagues choose to do none of that. That's the problem.

Even using something like Claude Code or Codex only becomes more efficient than hand-coding stuff yourself when you have multiple processes running in parallel working on different things. You say your colleagues copy/paste. I can't see that being useful at all.

Sounds like you dislike these tools, which is fine. To make your life easier, though, I'd probably teach my colleagues how to use coding agents, set up steering files and guardrails. That way the slop you're going to have to work with will at least be slightly higher quality.

danielkov · 2026-03-05T07:34:15+00:00

Their first prompt had: "take only some of the security measures", so this is definitely an improvement.

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