Buildoto
Technical details

Freelance Supabase developer, at a fixed price

Your application delivered in production on a PostgreSQL database, with accounts and multi-tenant security already proven: less development time, controlled operating costs. You own it, on a portable stack (PostgreSQL, Supabase), with no dependency on a vendor. Fixed-price package from €440 excl. tax, no subscription. Complete MVP from €6,600 excl. tax.

SM

Sébastien Mignot

Fixed price · indicative base ~€60/h

app.exemple.com
Monthly revenue
12 480 €
+18%
Signed contracts
34
+6
Conversion
24,1%
+2,3pt
Signatures / week
Acme SASSigned4 900 €
NorthwindIn progress8 200 €
GlobexSigned3 600 €

The problem

What slows you down, and what we change

Today

  • Weeks of development (accounts, multi-tenant, security) before a first result: every week of delay costs you.
  • Trusting your customer data to a technology and a profile you can't verify is a risk that's hard to size.
  • A badly designed database costs you in expensive rewrites and slowness as you grow.

With Buildoto

  • The structural building blocks are already built and in production: you only pay for their adaptation, at a fixed price, no subscription.
  • I design, code and deploy single-handedly, as on beforbuild.com: one point of contact, proof in production, and a 6-month warranty in the package.
  • Architecture built to last: tested RLS, clean migrations, controlled operating costs. Your investment doesn't vanish into maintenance.

Freelance Supabase developer, I design and deploy PostgreSQL backends, multi-tenant authentication systems and RAG pipelines on Supabase. Stack already in production on beforbuild.com, delivered at a firm fixed price on a signed scope, from €440 excl. tax.

What I build with Supabase:

  • Complete web/SaaS application backend: PostgreSQL database, API, file storage.
  • Authentication and multi-tenant RLS: each client isolated, structural GDPR.
  • RAG / semantic search with pgvector.
  • Firebase → Supabase migration: data, auth and storage, without breaking what exists.

Why Supabase: everything lives in a single PostgreSQL database (data, vectors, access rules), you keep SQL and avoid proprietary lock-in. It's my default when application data is central.

The packaged offer, at a fixed price

No daily rate: a signed scope, a fixed price, a production delivery. The structural building blocks (auth, multi-tenant RLS, pgvector RAG, Stripe payments) are already built and proven on beforbuild.com: you only pay for their adaptation to your business.

  • Complete SaaS MVP from €6,600 excl. tax: PostgreSQL database, accounts and auth, multi-tenant, one business feature, deployed. 4 to 6 weeks.
  • Feature to integrate from €440 excl. tax: RAG on your documents, PDF generation, signature, automation. 2 to 4 weeks.
  • Firebase → Supabase migration: quote after an audit of what exists, dual write for zero downtime.

We start with a free 30-minute audit: your need, what you have, and a fixed-price quote within 48 h.

Proof in production

Supabase in production on beforbuild.com

On beforbuild.com (my B2B SaaS), Supabase handles the PostgreSQL database, authentication, multi-tenant isolation (RLS) and vector search, in production, designed and delivered single-handedly.

Visit beforbuild.com
PostgreSQL
database + auth + vectors in one place
RLS
per-client isolation (multi-tenant)
pgvector
integrated RAG

Method

Audit → Build → Production

  1. 01

    Free audit · 30 min

    I embed in your context: mapping of your processes, your subscriptions and your vendor dependencies. No commitment.

  2. 02

    Fixed-price quote

    Scope priced on portable building blocks: feature to deploy or subscription replacement. Price and scope signed within 48 h.

  3. 03

    Deployment & handover

    I build it, deploy it in your environment and document it. You own the code and keep control of your data.

Fixed price

Module deployed in your app

€440 excl. VAT

+ customization quoted on your spec · fixed price signed before we start

Fixed price on a defined scope · indicative base ~€60/h

Book

Your free audit · 30 min

Pick a slot. We audit your case and you leave with a fixed-price quote.

FAQ

Frequently asked questions

SM

Who I am

A single point of contact, from audit to handover

I design, develop and run my own features in production: BeForBuild.com, the B2B SaaS I manage single-handedly, is the proof. These proven building blocks, I deploy them in your environment, at a fixed price, and you own them.

You talk directly to the person who delivers: no subcontracting, no agency layer. The one who designs is the one who codes, deploys and hands over.

Founder of BeForBuild.comA single point of contactFrom quote to ownership handover

Stack & intégrations

Cloudflare
Supabase
React
shadcn/ui
TypeScript
Mistral
Stripe
Documenso

Let's talk about your project

30 minutes to scope your need and quote the fixed price, no subscription. 6-month guarantee included. Reply within 24h.

Book my free audit · 30 min