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MentorLoop is a two-sided marketplace web application connecting early-stage hardware and deep-tech founders (pre-seed through Series A, concentrated in Boston, the Bay Area, Munich, and Stuttgart) with retired and semi-retired engineers and manufacturing/operations leaders who hold deep domain expertise in design for manufacturability (DFM), supply-chain qualification, EMC/safety certification (UL, CE, FCC), and contract-manufacturer tooling negotiation. Founders search or browse mentor profiles by expertise domain, book a paid hourly session with a specific named mentor, and pay through the platform; mentors set their own rate and availability and receive payout after each completed session, net of MentorLoop's 20% platform fee. v1 is web-only, launching first in the US and Germany, and exists to prove one thing: that a structured, vetted, paid booking marketplace for this specific expertise gap can generate real, repeat, two-sided transaction volume — not just sign-ups on either side.

This v1 must achieve three goals, each directly load-bearing for the go/no-go decision on building the Structured Track package and expanding beyond two markets:

1. Prove the core transaction loop end to end. A founder must be able to discover a relevant mentor, book them, pay for the session, and (post-session) leave a review, with zero manual intervention from the MentorLoop team for a booking that goes smoothly. Manual intervention should only ever be required for the exception paths (vetting, disputes), not the happy path.
2. Prove mentor supply-side activation, not just sign-up. It is not enough for retired engineers to create a profile; v1 must show that a meaningful share of approved mentors actually set live availability and accept at least one real booking within their first 60 days on the platform — the single biggest unproven assumption from the Idea Brief's own Key Assumptions section.
3. Prove the platform can operate its own exception paths at this team's actual capacity. With one technical founder and no dedicated ops hire, mentor vetting and dispute handling must be operable by a single person in well under an hour per case, or the model does not survive past the first few dozen bookings.

Everything in this document is designed to make those three goals measurable within 90 days of launch, not to build every feature the long-term vision implies (see the Structured Track and other deferred items below).