SIESA: The spreadsheet your business depends on, turned into software that can't break
Every company has one: the fragile spreadsheet the whole operation secretly runs on. For this manufacturer it was quoting. It became a web app anyone on the team can use — proven against the company's own historical numbers before launch, so the business trusts every quote it produces.
Industry
Industrial manufacturing · Mexico
Client
SIESA
Year
2026
The Challenge
Quotes for industrial grating were built by hand in a shared Excel file: fragile formulas, copy-paste errors, no history, and a process only a couple of people could run. Every mistake had a price in steel.
Our Approach
A web application that encodes the full quoting logic — products, dimensions, materials, pricing rules — behind a clean interface anyone on the team can use.
End-to-end tests run the app against real historical quotes ('golden' cases), so the software provably matches the numbers the business already trusts.
Every quote is stored, searchable and traceable — history that the Excel never had.
Built AI-first, with the same Claude-driven development system behind every GoodJuju project — which is how a complete quoting app ships in weeks, not months.
Outcomes & Impact
100% — of quoting logic out of Excel and into tested software. Proven — e2e tests against real historical quotes before launch. Live — in production on Vercel.
Live in production.