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Ship an AI product on infrastructure that already survived production
Synthetic demo: fictional product and team, illustrated with FINT's own infrastructure patterns. No external accounts, no ads spend, no outreach sent and no client site touched.
See it work
Ship an AI product on infrastructure that already survived production, Gridline (fictional), b2b saas, Remote. Two-founder team shipping an AI scheduling assistant; they need billing, approvals, provider failover and safe deploys before their first paying users.
- Goal: Build / launch AI systems
- Stack: Next.js, Postgres, Gemini primary + fallback provider
- Needs: Credits + subscriptions, human approval on outbound actions, no silent LLM outages, release gates
- Meter · Billing + credit metering kitPlan credits + purchased credits as separate ledgers; renewals additive and capped; idempotent grants, the credit-wipe class of bug is impossible by schema.
- Gate · Approval engine patternPropose → QA → approve/reject/revise → execute; engines can never approve their own output.
- Fail over · LLM resilience layerProvider chain with retry, timeout and model pinning; cost and latency logged per call.
- Verify · Release gate harnessLint → typecheck → test → build → provenance before any deploy; secret scan on every commit.
- Operate · Operator cockpitDead letters, stop-condition codes and manual retries in one screen.
- What the kit installsBlueprints + code patterns, each with tests.
- Failover log (illustrative)What the resilience layer records per call.
What the kit installs , list
- SQL: credit_balances / credit_ledger with fint_grant_credits / fint_deduct_credits / fint_renew_plan_credits
- Approval state machine with actor permissions + SLA clock
- AI provider chain with failover + usage ledger
- verify.sh gate + CI workflow
- Operator cockpit views
Failover log (illustrative) , table
| Call | Primary | Fallback used | Latency | Cost |
|---|---|---|---|---|
| draft-reply #4410 | gemini-flash | no | 820ms | $0.0009 |
| draft-reply #4411 | gemini-flash (timeout) | openai fallback | 2.9s | $0.0031 |
| classify #4412 | gemini-flash | no | 310ms | $0.0002 |
Synthetic demo: fictional product and team, illustrated with FINT's own infrastructure patterns. No external accounts, no ads spend, no outreach sent and no client site touched.
Want this for your business?
The billing, approvals, failover and release gates we run on, so you don't spend six months rebuilding them.
See plansRequest implementationMore demos: Intake, scheduling and documents without an admin hireFrom a thin website to a measured growth stackMarketing that runs on a cadence and is measuredRecurring operations that run themselves and escalate only exceptionsConsent-first recruiting with a recruiter in the loopA pipeline that fills and follows up without an SDRA conversion website, staged and QA'd before anyone sees it