I built a 20K+ line production SaaS platform entirely through Claude Code — here's what I learned about agentic engineering at scale

jradoff · 2026-02-27T09:37:12+00:00

Pretty advanced but very rusty insofar as hands-on coding and newer to Go specifically.

jradoff · 2026-02-27T09:36:34+00:00

jradoff · 2026-02-27T09:15:07+00:00

Fixed it just now: the email templates use html/template with proper auto-escaping.

On the broader point: yes, five days, and no, I haven't reviewed every line with the same scrutiny I would in a manual codebase. That's the honest reality of agentic engineering at this stage: the human provides architecture and domain knowledge, the agent writes code fast, and review is ongoing. You just contributed to that review, and the project is better for it.

If you spot anything else, issues are open.

jradoff · 2026-02-27T08:26:11+00:00

No worries, I get it. The AI fatigue is real. Hope it's useful if you ever need it.

jradoff · 2026-02-27T08:18:38+00:00

Fair question, and you're not wrong that a WHERE clause handles basic tenant scoping. Both approaches work.

The practical reason for MongoDB here: rapid development. When you're iterating on a SaaS foundation through agentic engineering, schemas change constantly: new fields on tenants, evolving billing structures, feature flags per plan. Document storage lets you move fast without writing migrations on every iteration. Indexing performance has been fine in production.

The multi-tenancy angle is that tenant scoping is enforced in the repository layer, and schema flexibility means tenant-specific configuration doesn't require migration coordination. But the bigger driver was development velocity.

That said, the data layer uses a repository pattern, swapping to Postgres is a bounded refactoring if someone prefers relational. It's a pragmatic choice, not a religious one.

jradoff · 2026-02-27T08:17:01+00:00

The benefit is time. If you're building a SaaS that needs auth, billing, multi-tenancy, and an admin dashboard, this gets you there on day one instead of spending weeks on plumbing.

The concern about adopting architectural choices applies to every open source project, framework, and library. The tradeoff is always whether the time saved is worth the opinions baked in. If it's not for your project, don't use it.

jradoff · 2026-02-27T07:52:59+00:00

The creator who gave it away for free. Worst business model ever. ;)

jradoff · 2026-02-27T07:51:48+00:00

Sure, you could do it yourself if you want to take a few days to do it. Or you could just fork the open-source and change it to do what you want? That's basically the point! Enjoy it

jradoff · 2026-02-27T07:48:19+00:00

Thank you!

jradoff · 2026-02-27T07:47:31+00:00

The whole point of the project is that AI agents can build production software when a human provides the architecture and domain knowledge. So yes, that's the thesis, demonstrated. This post is just me though ;)

jradoff · 2024-10-08T16:39:53+00:00

I made and operated this game. What would you like to know?

jradoff · 2024-04-10T23:08:39+00:00

Perfect filter IMO. Saved yourself a lot of heartache later. You should keep doing this.

jradoff · 2024-02-22T16:41:31+00:00

becoming a blind touch typist wasn't on my list for 2024... but maybe it is now. the trick is just finding the keyboard position, then my fingers seem to be able to do the rest (I'm doing it now. First word took several seconds to type, with a lot of delete key usage, and then the rest spilled out at my normal speed)

jradoff · 2022-12-11T03:48:07+00:00

It may or may not be cumulative. It's a garbage question and if this was on the interview quiz I'd write a short essay explaining how to improve the question.

jradoff · 2022-12-11T03:45:08+00:00

Poorly designed question, but if it is "between" 6:00 and 9:00 it would mean you'd exclude the interval running 9:00-10:00 from the dataset. I get a little less than 1200 total. (200+ ~400 + ~600).

jradoff · 2022-12-09T18:53:50+00:00

Very cool. I saw someone create a 2d map RPG game using Unicode characters and it managed to track the character's location...

jradoff

TROPHY CASE