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Pilot testing with 3 clients2026

PitlaneOne

Multi-tenant operations and invoicing platform for automotive workshops

My role

Product Architecture · Full-stack · UX/UI · Data · Compliance Workflows · DevOps

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01

Project overview

PitlaneOne replaces fragmented workshop records with one operational workspace for customers, vehicles, service history, appointments, inventory, teams and invoices.

The platform is currently being tested with three client workshops. Each company runs in an isolated environment with role-based access and its own customizable public website, using an interface designed for fast daily work on desktop and mobile.

For the German market, invoicing follows an explicit Draft–Issued–Correction–Storno lifecycle. Final documents are archived with their source data and can be exported as PDF and structured XRechnung files for the accountant; the product does not claim GoBD certification.

02

Real product screenshots

Only real product screenshots will be placed here—no mockups or stock imagery.

01

Company dashboard and mobile navigation

Only real product screenshots will be placed here—no mockups or stock imagery.

/projects/pitlane-one/desktop-01.webp
02

Customer, vehicle and service workspace

Only real product screenshots will be placed here—no mockups or stock imagery.

/projects/pitlane-one/mobile-01.webp
03

Invoice lifecycle and document archive

Only real product screenshots will be placed here—no mockups or stock imagery.

/projects/pitlane-one/desktop-02.webp
04

Inventory, appointments and public website settings

Only real product screenshots will be placed here—no mockups or stock imagery.

/projects/pitlane-one/mobile-02.webp

03

System architecture

Workshop workspace

Customers · Vehicles · Services · Stock · Appointments

Tenant-aware application

Authentication · Roles · Supabase RLS · Company context

Invoice lifecycle

Draft · Issued · Correction · Storno · Payment ledger

Documents and delivery

PDF · XRechnung · Accountant export · Public website

04

Project status

Built

  • Multi-tenant companies with role-based staff access
  • Customer, multi-vehicle and service-history workflows
  • Draft invoices that remain editable until finalization
  • Immutable issued invoices with unique numbering and audit metadata
  • Correction, Storno, payment and refund-recording workflows
  • PDF archive copies and XRechnung/accountant export packages
  • Inventory, appointments, team and subscription areas
  • Customizable multilingual public workshop websites

In active development

  • Independent EN 16931 validation reports archived per e-invoice
  • Expanded correction-invoice editor and accounting handoff UX
  • Production domain, monitoring and commercial billing rollout

Planned

  • ZUGFeRD hybrid PDF/XML generation
  • Additional accountant integrations and bulk reporting
  • Broader workshop automation and operational analytics

05

Engineering decisions

Why multi-tenant from the start?

Company context and database-level RLS make isolation a foundation of the product instead of relying only on interface checks.

Why lock an invoice after issuing it?

Accounting documents need a traceable history. Changes are handled through correction or Storno documents while the original remains available.

Why separate operations from the public website?

Staff receive a focused private workspace while every workshop can publish its own branded customer-facing presence from the same structured data.

06

Challenges solved

  • 01Keeping every query and mutation scoped to the active company
  • 02Making accounting safeguards understandable in a simple workshop UI
  • 03Producing consistent PDF and structured e-invoice exports
  • 04Supporting six application languages without duplicating business logic
  • 05Keeping dense operational navigation compact and usable on phones

07

Technology stack

Application

  • Next.js 15
  • React 19
  • TypeScript
  • Tailwind CSS

Data & security

  • Supabase
  • PostgreSQL
  • Row Level Security
  • Storage

Documents

  • PDF-lib
  • XRechnung XML
  • EN 16931 preflight
  • ZIP/CSV exports

Delivery

  • Vercel
  • PWA
  • i18n
  • Production smoke tests

08

What it demonstrates

PitlaneOne demonstrates my ability to turn a complex, regulated business workflow into a secure multi-tenant product—from data architecture and mobile UX to document generation, testing and production delivery.

Who this is relevant for

Relevant for clients who need a SaaS MVP, internal operations platform, role-based business software, invoicing workflow or modernization of a paper- and spreadsheet-based process.

Need a similar system?

I can design and build a solution around your workflow, team, and business goals.

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