<p><b>Startup description</b></p><p>My product is an enterprise-grade, multi-tenant scheduling and booking operating system tailored for appointment-based businesses (salons, gyms, clinics, etc.). It allows owners to manage multiple shops, complex staff working hours, and capacity rules, while customers book frictionlessly via a public link. I started this project as a technical founder in late 2025 because existing booking systems lacked robust, native WhatsApp transactional integrations and seamless offline mobile capabilities. I spent over 12 months engineering a scalable, production-ready backend that solves hard scheduling problems like micro-gap optimization and recurring schedule exceptions.</p><p><b>Key highlights:<b></b></b></p><ul> <li><b>TTM revenue:</b> €500</li> <li><b>Customer-need-driven product:</b> I've built the product entirely on customers' needs</li> <li><b>Fully Dual-Platform:</b> A responsive Web App (React) and a native Manager App (iOS/Android via Expo) already published on app stores.</li> <li><b>Advanced IP:</b> Highly engineered domain logic handling complex multi-constraint availability.</li> <li><b>Built-in Upsell Engine:</b> WhatsApp message credits billing system built natively into the platform.</li> </ul> <p><b>Team</b></p><p>I am a solo technical founder and full-stack developer. I handle 100% of the responsibilities, including backend architecture (Supabase), frontend development, mobile app deployment, and initial customer onboarding. The business is highly automated and currently runs without the need for additional staff.</p><p><b>Tech Stack</b></p><ul> <li><b>Backend &amp; Database:</b> Supabase (PostgreSQL with highly optimized PL/pgSQL RPCs for scheduling logic, Row Level Security, and 70+ Edge Functions in Deno).</li> <li><b>Web Frontend:</b> React 18, Vite, TypeScript, Tailwind CSS, React Query (for SSG and client-side routing).</li> <li><b>Mobile App:</b> React Native with Expo SDK 54, Expo Router, NativeWind, featuring an offline-first mutation queue (AsyncStorage) for unstable connections.</li> <li><b>Third-Party Integrations:</b> Stripe (Web billing), RevenueCat (iOS IAP), Resend (Transactional emails), and Meta Cloud API (WhatsApp messaging).</li> </ul> <p><b>Marketing and growth</b></p><p>To validate the product-market fit and test conversion rates, I ran two highly targeted paid micro-campaigns with a total budget of just €200 ($220). The results were extremely promising for a B2B SaaS: this small initial test successfully acquired 2 active paying customers and 1 free trial user who has already committed to upgrading to a paid subscription starting in September.</p><p>This proves that the market is highly responsive to the value proposition and that the Customer Acquisition Cost (CAC) is exceptionally low (under €100 per B2B client). The platform is now fully primed for a buyer with a real marketing budget who can take these proven, high-converting channels and scale them aggressively.</p><p><b>Revenue and profit</b></p><ul> <li><b>ARR:</b> ~$550 (approx. €500)</li> <li><b>MRR:</b> ~$45</li> <li><b>Monthly Operating Costs:</b> ~$35 - $40 (The infrastructure runs efficiently on generous free/low-cost tiers of Supabase, Vercel, and Resend, making the business technically profitable from day one).</li> <li><b>Business Margin:</b> ~90%+ (on a scale)</li> <li><b>Monetization Model:</b> B2B SaaS Subscriptions + Pay-as-you-go consumable WhatsApp message credits (Stripe)</li> </ul> <p><b>Return on investment</b></p><p>If evaluated purely on cash flow, the payback period is long. However, this is an <b>Asset Sale</b>. The immediate ROI for a buyer (especially an agency or software house) is the <b>$80,000 to $180,000 saved in R&amp;D and engineering costs</b>, plus 12-18 months of time-to-market saved. A buyer can achieve immediate payback by either white-labeling the software to their existing agency clients or onboarding just 40-50 new users at a $39/month Pro plan.</p><p><b>Startup assets<b></b></b></p><ul> <li>2x Source Code Repositories (Web App &amp; Mobile App) with full ownership.</li> <li>1x Supabase Project &amp; Database Architecture (including 250+ SQL migrations).</li> <li>1x Production Domain name.</li> <li>2x Developer Accounts (App Store &amp; Google Play app transfers).</li> <li>Stripe &amp; RevenueCat configurations.</li> <li>Brand assets, UI/UX design files.</li> <li>30 days of post-sale technical support and 2 handover calls to ensure a smooth transition.</li> </ul> <p><b>Risks</b></p><p>The main market risk is the presence of heavily funded, giant competitors like Treatwell and Fresha, which possess significantly larger marketing budgets and established brand awareness. Competing with them head-on in the mass market is a losing battle.</p><p>How to minimize: A buyer should completely avoid fighting these giants on their terms (mass-market marketplaces) and instead adopt a <b>niche, hyper-local B2B SaaS strategy</b>.</p><ul> <li><b>No Commission Model:</b> Big players like Treatwell often charge high commission fees per booking. My service is a pure fixed-fee subscription software, which is highly preferred by established businesses that want to keep 100% of their revenue.</li> <li><b>The WhatsApp Advantage:</b> Its deep, native integration with Meta Cloud API for WhatsApp confirmations is tailored specifically for the European market, where business owners want direct, reliable messaging rather than generic app notifications. Our price per WhatsApp message is lower than competitors'.</li> </ul> <p><b>Summary</b></p><p>You are not just buying $550 of ARR; you are acquiring a massive head start. You are skipping the "Build" phase and going straight to "Go-to-Market". My product solves the hardest problems in the booking industry (offline sync for staff, micro-gap optimization, and native WhatsApp integration) in a polished, production-ready codebase. If you are a marketing-focused founder or an agency with access to local businesses, you can plug this enterprise-grade infrastructure into your network and start generating high-margin MRR tomorrow, bypassing a year of expensive development.</p><p>✅ $50 TTM revenue</p><p>✅ 2 customers</p><p>✅ Business model: SaaS+Credits</p><p>✅ Built with Stripe, React Native, Supabase</p>