Buildoto
Technical details

Freelance Supabase developer

The technology behind the customization of my features: PostgreSQL database, authentication, multi-tenant security (RLS) and RAG on Supabase, proven in production, optimized to run at low cost. At a fixed price: an MVP from €6,900 excl. VAT, a feature from 490 € excl. VAT.

SM

Sébastien Mignot

TJM 440 € HT/jour · forfait fixe

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

  • Building auth, multi-tenant and security (RLS) from scratch takes weeks.
  • Finding a Supabase dev who has already delivered to production is rare.
  • A poorly architected database costs dearly later.

With Buildoto

  • A base proven in production, adapted to your need, not started from scratch.
  • I design, code and deploy solo, like on beforbuild.com.
  • Architecture built to last: tested RLS, clean migrations, controlled costs.

Freelance Supabase developer, I design and deploy PostgreSQL back-ends, multi-tenant authentication systems and RAG pipelines on Supabase. Stack already running in production on beforbuild.com, delivered at fixed price from 490 € HT, or 440 € HT/day on time and materials, depending on your needs.

What I build with Supabase:

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

Why Supabase: everything lives in one PostgreSQL database (data, vectors, access rules), you keep SQL and avoid vendor lock-in. My default when application data is central.

The packaged offer, fixed price

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

  • Full SaaS MVP from €6,900 HT: PostgreSQL database, accounts and auth, multi-tenant, one business feature, deployed. 4 to 6 weeks.
  • Feature to integrate from 490 € HT: RAG on your documents, PDF generation, signature, automation. 2 to 4 weeks.
  • Firebase → Supabase migration: quote after audit, dual-write for zero downtime.

Start with a free 30-minute audit: your need, your existing setup, and a fixed-price quote within 48h.

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 solo.

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

    We choose the right feature and scope your specifications. No commitment.

  2. 02

    Fixed-price quote

    Already-built base + customization priced to your specifications. Price and scope signed within 48 h.

  3. 03

    Customization & production launch

    I adapt the feature to your needs, deploy it and document it. Optimized to run at minimal cost.

Fixed price

Complete SaaS MVP (database + auth + 1 feature)

€6,900 excl. VAT

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

Or 440 € HT/day on time and materials, adapted to your needs.

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 quote to production

I design, develop and run my own features in production, BeForBuild.com, the B2B SaaS I run on my own, is the proof. These are the already-proven building blocks I offer you, adapted to your needs.

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

Founder of BeForBuild.comA single point of contactFrom quote to production launch

Stack & intégrations

Cloudflare
Supabase
React
shadcn/ui
TypeScript
Mistral
Stripe
Documenso

Let's talk about your project

Book my free audit · 30 min