JExcellence
JExcellence
Full-stack · Oldenburg
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FOR TECH FOUNDERS AND EARLY-STAGE TEAMS

An MVP you can take to investors and first customers.

Back end, front end, login, and payments, live after eight to ten weeks. Built with Java/Spring or Node.js and Next.js, tested and documented so your future team can build on it.
Request a founder sprint
See packages
Reference: Aveiro, SaaS with Stripe subscriptions
Weekly demo on a staging environment
Code and data belong entirely to you
Aveiro, publishing platform
REFERENCE

Aveiro, publishing platform

Site builder, CMS, blog, and newsletter in one workspace, with subscription billing via Stripe and AI features. Designed, built, and run single-handedly, currently in closed beta.
Next.js 16React 19, Supabase, PostgreSQL
Stripesubscriptions and billing
1person from concept to operations
Visit aveiro.app
§ MODULES

What goes into an MVP

The basics are part of every sprint; everything else we agree in the discovery workshop.
Included in the sprint
Login and accountsSign-up, sign-in, password reset, and roles, secure and without home-grown experiments.
Included in the sprint
PaymentsStripe Checkout or subscriptions with webhooks, invoices, and test mode, as in Aveiro and Mythblock.
Included in the sprint
Admin areaManage users, data, and content without touching the database directly.
Included in the sprint
EmailsConfirmations, invitations, and notifications through a reliable delivery service.
Included in the sprint
Hosting and monitoringProduction, staging, automatic deployment, and error monitoring.
Optional
APIsA REST API for a later app or integration with existing systems.
Optional
AI featuresText or image generation through an AI gateway, as in Aveiro.
Optional
Multiple languagesGerman and English from day one, for markets beyond DACH.
§ PROCESS

How the sprint works

Eight to ten weeks, a demo every week.
  1. 01

    Discovery workshop

    One to two days: what the first version must do and what it deliberately won’t. Then the fixed price is set.
  2. 02

    Foundation

    Back end, database, login, and a first front end after about two weeks.
  3. 03

    Core features

    The features that define your use case, including payments. A live demo every week.
  4. 04

    Launch and handover

    Go-live, documentation, and handover to your team, or continued development with me.
§ PRICING

Packages

Final prices. The binding fixed price is set after the discovery workshop.
Tech check
For teams with an existing prototype or AI-generated code.
Fixed price
€890
  • Up to one working day of analysis
  • Rating of code, security, payments
  • Prioritised action list
  • Fixed-price quote for the build
Enquire
Founder Sprint
Recommended
A complete MVP in eight to ten weeks.
from
€14,900
  • Back end, front end, database
  • Login, payments, emails
  • Hosting and monitoring
  • 30 days of bug fixing after launch
Enquire
Continued development
After launch: care and new features.
 
€290per month
  • Updates and monitoring
  • Hour budget for new features
  • Fixed response times
  • Cancellable monthly after three months
Enquire
All prices are final. No VAT is charged under § 19 UStG (German small-business rule).
§ QUESTIONS

Frequently asked questions

Ready for your sprint?

A 30-minute first call. You’ll find out whether your idea is realistic in eight to ten weeks.
Book a first call