> SYSTEM ONLINE · AVAILABLE NOW_[ 01 / 07 ]

ISHIPAI-POWEREDWEBAPPSSOLO.

I ship production web apps end-to-end — design, code, deploy. One person, one invoice, in weeks not months.

AI MVP Sprint·from 4.5K€ · 3–6wLanding Page That Converts·from 1.5K€ · 5–15dAI Automation Tactical·from 1.8K€ · 1–3w
See my work
[ 0K+ ]LINES_OF_CODE▪[ 0+ ]SCREENS▪[ 0 ]MODULES▪[ 1MO ]TO_SHIP
LATENCY: <48H·WORLDWIDE·STACK: NEXT.JS + SUPABASE + OPENAI + ANTHROPIC·SHIPPED: 2 SAAS·BOOKING: OPEN·LATENCY: <48H·WORLDWIDE·STACK: NEXT.JS + SUPABASE + OPENAI + ANTHROPIC·SHIPPED: 2 SAAS·BOOKING: OPEN·
// What I build //

Three offers. One person.

Productized scopes. Fixed timelines. Transparent pricing.

/ 01

AI MVP Sprint

Ship your AI-first product in 3–6 weeks.

  • Full-stack web app (Next.js + Supabase)
  • AI integration (OpenAI / Anthropic, agents, RAG)
  • Auth, DB, RBAC, payments if needed
  • Deployed + handoff with docs
from 4.5K€·3–6 weeks
/ 02

Landing Page That Converts

A conversion landing in 5–15 days.

  • Custom design from your brand voice
  • Mobile-first, blazing fast (Next.js)
  • Copywriting + CRO basics
  • Analytics + tracking setup
from 1.5K€·5–15 days
/ 03

AI Automation Tactical

Automate one workflow in 1–3 weeks.

  • Workflow audit + scope
  • Custom AI agent wired into your stack
  • API + minimal UI if needed
  • Documentation + handoff session
from 1.8K€·1–3 weeks
// Selected work //

One build. Three surfaces.

SKEMA Consultoria JR — the platform that runs a 30-person Junior Enterprise. Built in one month, solo, end-to-end.

Project//2026//In production

SKEMA Consultoria JR

An internal hub for the team, a public website for the market, and a client portal for signature — all from one codebase. In production today with a 30-person team.

0K+Lines of code
0+Screens
0Modules
0Month to ship
Row-level security, Real-time subscriptions, Server-side PDF stamping, Auto-payment generation, 10 RBAC roles, Bilingual EN/PT, Activity audit log, 30+ protected routes, Auto project creation, Installment tracking.
/ 01

Internal Hub

Where the team runs the business.

  • 6 departments — HR, Finance, Commercial, Marketing, Innovation, Projects
  • 10 roles, per-page permissions, full activity log
  • Real-time messaging via Supabase subscriptions
  • Server-side PDF generation for invoices and contracts
30+ protected routes
/ 02

Public Website

A marketing site that closes deals.

  • Bilingual EN/PT with live language switcher
  • Self-serve quote builder with itemized pricing
  • Cases and reviews sourced from the Hub in real time
  • Quote submissions land directly in the CRM
Bilingual · self-serve quote
/ 03

Client Portal

Where clients sign and track delivery.

  • Row-level security — clients only see their own data
  • Two-step digital signature flow with PDF stamping
  • Live project tracking — same status JE and client see
  • Contract signing auto-creates the delivery project
Digital signature · RLS-secured
// Stack
Next.js 16React 19TypeScriptTailwind 4SupabasePDF-LibVercel
// How I work //

Four steps. No black box.

From first call to shipped product. You always know exactly where we are.

/ 01

Discovery call

Free · 15 min

A real conversation about your project, your stage, and whether I'm the right person to build it.

/ 02

Proposal

Within 48h · 50% upfront

Fixed-scope offer with exact deliverables, timeline, and price. Sign and we start.

/ 03

Build

Weeks, not months

Daily updates on a shared Notion. You see progress in real-time. No black box, no surprises.

/ 04

Ship & handover

Production-ready · 30-day support

Clean code, documented, deployed. Bug-fix support included for the first 30 days.

Calls in EN or FRAsync work in any language
// About //
Lucas Donjean

Lucas Donjean

Solo Founder Engineer

I'm Lucas. I build the apps you don't have time to build.

Finance & Quant MIM at SKEMA. Ended up writing 28K+ lines of code in a month to ship a platform that now runs a 30-person business. Now I do this for other founders.

I work alone — by design. One person, one invoice, one accountable shipper.

MIM · Finance & Quant

I read your runway like you do.

EU · BR base

Overlap US East, EU full day.

Solo by design

No PM tax, no handoff loss.

AI-first

Every workflow ships AI-native.

Want to see if we'd work well together?

// Let's ship //

Let'sbuild it.

Free 15-minute call. Or just send an email. Either works.

Available nowReplies in 48hBooking: Open