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Prototype → EVT → Production Handoff · SF Bay Area ↔ Taiwan

Fast iteration. Structural IP protection.
For AI teams crossing into the physical world.

A hardware studio built for AI teams making their first physical product. From sketch to small-batch build in weeks, backed by a vetted Taiwan manufacturing network and tooling terms that keep your IP where it belongs.

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REV 2026.07
爐心工坊 · NO.001
Approach

A network you can actually verify.

AI teams move fast — and most default to open shop networks when they first cross into hardware. HearthFire is built for that moment: a fixed, vetted partner circle in Taiwan, with tooling and NDA terms that are structural, not just contractual.

Spec Open shop network HearthFire Works
Iteration speed Fast — dense workshop clusters Fast — direct Taiwan partner network
IP protection Weak — designs circulate the cluster Structural — a fixed, vetted partner set, not an open shop network
Fabrication partners Design shared informally across an open cluster of shops Your design stays inside a small known circle — no open-market sourcing
Critical tooling Molds and fixtures often held by the shop, not you Tooling ownership terms negotiated upfront, in your name
Customer-facing team Remote broker, language and time-zone gap Bay Area team who speaks your product's language, natively
Trust basis Transactional Direct relationship, senior hands on every build
Services

Three stages, one team.

PROC 01
Prototyping & iteration
Mechanical, electrical, and firmware integration — from sketch to working unit, with fast turns between revisions.
PROC 02
Small-batch EVT
Customized short runs with no minimum-order pressure — built for AI teams still validating their first physical product, not chasing volume. Especially teams who went from model to device faster than they expected to.
PROC 03
Production handoff
When you're ready to scale, we bridge you into Taiwan's established OEM/ODM network — on terms you helped set.

Your design never touches an open shop, and your tooling never leaves your name — that's not a policy, it's how the network is built.

Fixed partner circle
We work with the same vetted fabrication partners on every job. No open sourcing, no new shops added mid-project without your knowledge.
Tooling in your name
Molds and fixtures are contracted directly to you from day one — not held by the shop and released later at their discretion.
NDA with teeth
Partners operate under Taiwan-law NDAs with IP assignment clauses — not courtesy agreements that dissolve when a relationship ends.