Inspiration
We were already running a voice receptionist for real dental clinic and real estate clients — booking calls, handling reschedules. But the front desk was only half the problem: the same businesses were still losing hours to manual supplier calls and invoice chasing on the back end
What it does
Nexus runs a business's front desk and back office with three AI agents — one answers calls and books appointments, one manages suppliers and pays verified invoices, one reads the day and briefs the owner. High-value payments pause for approval before they go through.
How we built it
Retell AI (voice), n8n (orchestration), ElevenLabs (supplier calls), Gemini (reasoning), Dodo Payments (settlement), Flask backend with shared state, React/Vite frontend — built on voice automation already shipped for real clients.
Challenges we ran into
Keeping three agents in sync on shared state, building invoice-verification strict enough to trust with payments, deciding when to pause for owner approval vs. act automatically, and doing it all under time pressure.
Accomplishments that we're proud of
Built a real end-to-end loop across three agents — calls to bookings, suppliers to verified payments, a full day to one owner brief — with a genuine approval flow that actually pauses on high-value payments, all demoable live.
What we learned
Live production integration, multi-location rollout, and vertical packs pre-tuned for dental, real estate, and coaching.
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