Kaizzon
Rexus Studio's own product — one integrated operations platform for commercial specialty contractors: RFIs, submittals, change orders, AIA G702/703 billing, field reports, and live job financials in one system, with Claude writing the daily brief and reports. Contractors own the code and the data, not a subscription.
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The problem
A specialty contractor — electrical, mechanical, plumbing — runs every job across five disconnected tools: RFIs and submittals in email, change orders in spreadsheets, billing in accounting software, field notes in text messages. The labor overrun that happened Tuesday surfaces on Friday, an approved change order sits unbilled, a pay application slips past its window. The big construction platforms cost more every year than a custom build costs once, and crews use a fraction of them. We built Kaizzon to run the whole job — award through closeout — in one system, owned outright rather than rented.
What we built
- A portfolio Command Center that ranks every open item by urgency and dollar impact — overdue receivables, jobs at risk, margin fade, unsent pay-apps — so the owner sees what's about to cost them before it does
- Award-to-closeout project management in one system: RFIs, submittals with approval workflows, change orders with cost-estimate worksheets, purchase and material orders, schedule, and field reports filed from a phone
- AIA G702/G703 billing — schedule of values, pay applications, retainage, and change-order billing — produced as compliant documents instead of spreadsheet gymnastics
- Live job financials — cost-to-complete, projected margin, profit-fade, and a continuously computed executive snapshot of contract, cost, and projected profit
- AI, powered by Anthropic Claude and grounded strictly in each job's own data: a daily brief, a weekly financial report, meeting-minutes extraction, cross-project Q&A, and drafted chase and escalation emails
Approach and role
Kaizzon is our own product — the custom operations software we build for specialty contractors, productized into something any shop can run. We own the whole stack: a Next.js and React front end, a NestJS and PostgreSQL backend, and Claude wired in only where it earns its place, always answering from the job's data rather than free-floating. The model is deliberately anti-SaaS — each contractor gets their own deploy and owns the code and the data outright, delivered in a four-week build with a working demo in days.
Outcome
Kaizzon is the work we're known for — AI-integrated operations platforms — turned into a product we own, sell, and stand behind. One system runs a contractor's whole job from award to closeout, with Claude doing the reading and the owner seeing risk before it lands, on infrastructure the client owns rather than rents.
