Bolt → a base that survives month two
Bolt built your MVP in a weekend.
The weekend is over.
Bolt's speed comes from never stopping to structure anything — every prompt piles code onto a project that was born without architecture. That's a fair trade for a demo, and a fatal one for the month-two feature list, when every change starts costing double. useDeploy is where the MVP grows up: bounded modules, boundaries that fail the build when crossed, and contracts that catch drift before your users do.
The mechanism: velocity with no load-bearing walls
Bolt's pitch is the whole app, in the browser, now — and it delivers, precisely because it skips everything that makes an app changeable later. There's no separation between UI, API, and data access, because separation costs prompts. Nothing is ever reorganized, because reorganizing is not a feature you asked for. The debt curve this produces is well documented: "Tech debt isn't paid down, it's being added to, and at some point in the future it will need to be collected" (news.ycombinator.com). And the collector arrives with a twist specific to AI-built apps — the doom loop: once the project passes a certain size, the AI that built it can no longer reliably refactor it, because the codebase has outgrown the model's effective context window (morphllm.com). The tool that created the mess is structurally unable to clean it up. And you never learned the codebase, because you never wrote it.
How Bolt spaghetti shows up
Fix one thing, break two
Bolt features share files, state, and improvised helpers, so no change is local. You budget an hour for a fix and spend the afternoon on collateral damage.
The API is wherever a prompt put it
Endpoints scattered across files, each validating input differently — or not at all. There's no single place to see what your backend even exposes.
A schema made of afterthoughts
Columns added prompt by prompt, names drifting, relations implied rather than declared. The database records the history of your prompts, not the design of your data.
Same logic, different bugs
The order-total computation exists in three places with three roundings. Users see whichever one their click path hits.
The agent regenerates instead of repairing
Ask for a fix and it rewrites the whole file, taking your manual patches with it. Progress becomes non-monotonic.
Debugging outweighs building
The tell that the demo phase is over: prompts that used to add features now mostly generate apologies and partial reverts.
The wall: a build that fails when boundaries break
This is the difference between a convention and a wall. In useDeploy the DDD layering is enforced by ESLint flat-config: domain code that imports Prisma or Express fails the build. An agent can't 'helpfully' inline a database call into your business rules — CI rejects the edit before it can become architecture. On Bolt, mess accumulated silently; here, it fails loudly and never lands.
1 $ bun run lint
2
3 apps/server/src/modules/billing/domain/subscription.ts
4 error '@prisma/client' import is banned in domain/
5 ddd-boundaries/no-infra-in-domain
6
7 apps/server/src/modules/iam/domain/session.ts
8 error 'express' import is banned in domain/
9 ddd-boundaries/no-framework-in-domain
10
11 ✖ 2 problems (2 errors, 0 warnings)
12
13 CI: lint ✗ — merge blocked.
The structure you're porting into
Bounded contexts instead of one big pile
iam, tenancy, billing, storage, ai, and webhooks are separate modules with domain, application, infrastructure, and interface layers — every capability isolated, every dependency pointing inward.
One source of truth for every payload
@app/contracts holds the shared Zod schemas; openapi-fetch types the client from the server's own OpenAPI output; the api-types-fresh gate fails CI on drift. The 400-in-production bug class is closed.
Merges gated by 450+ tests
Unit and integration coverage plus a Playwright E2E gate. On Bolt, regressions shipped silently; here they fail a check with a name.
An outbox for side effects
Emails, webhooks, and sync jobs go through an event bus with a durable outbox — retried, observable, and out of your request handlers.
An operating manual in the repo
CLAUDE.md encodes the rules agents must follow; the architecture docs at /docs explain the why. The next prompt inherits the design instead of re-deriving it.
The migration path: triage, don't rewrite
Getting out is a triage, not a rewrite. Download your project — Bolt code exports as a standard web stack and was always yours — and sort it into three piles. Screens and components: keep them; they're React and they carry your validated UX. Product logic: extract it; this is the code worth owning, and it moves into a bounded context where tests and lint hold it in place. Plumbing — the improvised auth, the webhook handler a prompt wrote at 2 a.m., the upload code: delete it, because useDeploy ships hardened, tested versions of all of it. Port one feature at a time, and keep using an agent for the port itself; the boundaries hold no matter who is typing. The weekend-MVP speed comes back — it just stops borrowing against month two.
Bolt migration questions
Do I lose the speed that made Bolt worth it?+
Can I even get my code out of Bolt?+
How much of my Bolt project survives the move?+
What stops an agent from making the same mess on the new base?+
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Keep the weekend speed. Lose the month-two collapse.
Port your Bolt MVP onto a base where the plumbing is done, the boundaries fail the build, and 450+ tests guard every merge.