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Custom web application development, Next.js and React

Custom web application: SaaS, MVP, internal dashboard, platform.

Next.js + TypeScript on the front, Symfony, Laravel or Node for the API, PostgreSQL + Prisma. Auth, Stripe payments, async jobs, tests and CI/CD. Deployed on Vercel or self-hosted Docker depending on your needs.

Who is it for?

  • Startup founders launching an MVP
  • SMBs needing an internal business tool
  • B2B SaaS in scale-up phase
  • Companies modernizing a legacy tool

What I deliver

  • Next.js 15 App Router app with strict TypeScript
  • Authentication (Better Auth, OAuth, magic link, SSO)
  • PostgreSQL database with Prisma ORM
  • Documented REST or GraphQL API
  • Admin dashboard, user and permission management
  • Integrations (Stripe, Resend, S3, webhooks)
  • Tests, CI/CD, monitoring and documentation

How it works

  1. 1

    Discovery

    2 workshops to scope the MVP and prioritize features.

  2. 2

    Sprint 0

    Tech setup, design system, CI/CD, first screens.

  3. 3

    Sprints

    1-2 week iterations with regular demos.

  4. 4

    Launch

    Private beta, adjustments, public launch and follow-up.

Frequently asked questions

How much does an MVP cost?

A working MVP runs between €15,000 and €40,000 depending on scope. Fixed quote after a free initial scoping session.

How long for an MVP?

Between 6 and 12 weeks depending on complexity. Short sprints with regular demos so we can iterate fast.

Are you available for long engagements?

Yes. I can commit to 3-12 months as fractional CTO or lead developer on your product.

Other expertise

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Custom Web Application Development | Xavier Adda