Case Study · Oct 19, 2026 · 6 min read
The LLM explains, the rule decides: deterministic guardrails in a safety API
Why in Goable a model can't overturn a ban: lightning and air quality gates on top of the scoring.
Full stack developer for agencies and SMEs: Next.js and AI that actually run in production.
One developer for code, infrastructure and monitoring. Defined scope, fixed price, code and repository yours on final payment.
One person accountable, from brief to production.
I'm Fabio Carucci, a freelance full stack developer. I work with Next.js, TypeScript and Payload CMS, and I take care of everything software needs to hold up in production: integrations, AI, infrastructure, monitoring. I work for web agencies that hand me the technical side, and for SMEs with a custom product or process.
I'm Fabio Carucci, a freelance full stack developer. I work with Next.js, TypeScript and Payload CMS, and I take care of everything software needs to hold up in production: integrations, AI, infrastructure, monitoring. I work for web agencies that hand me the technical side, and for SMEs with a custom product or process.
Got a project with clear goals? On a call I'll tell you whether it's feasible and how long it takes. Then I send you a written quote.
01
Web products in Next.js
Applications, platforms and internal tools with Next.js, TypeScript and Payload CMS. Scope and price agreed up front, code and repository yours on final payment.
02
AI and integrations
Assistants grounded in your data, document extraction and classification, drafts with human review. With logs, cost limits and tests. Plus APIs and connections to the systems you already use.
03
Infrastructure and reliability
Deploys on Vercel or AWS, infrastructure defined in code with Terraform, Sentry monitoring, automated tests. The project keeps running after launch.
My products
I don't only write software for others: I founded and built two SaaS products on my own.
Product, front end, back end, AI and infrastructure: I made them and I run them in production every day. The choices I bring to client projects, I test there first.
See how they are made
In productionHow I built itGoable
A B2B API that turns weather and physical data into a score from 0 to 100: for that activity, in that place, at that time, can you go or not.
In productionHow I built itSealect
Management software for water sports schools, centres and rentals, with the marketplace where customers find and book them.
