Case Study SaaS Sprint 3 Apps

Three production SaaS apps built in 48 hours

A client meeting was scheduled for Thursday. We had nothing to show. By Wednesday night, three fully deployed AI-powered SaaS applications were live — with authentication, Stripe payments, and token-based billing.

48h
Total build time
3
Production apps
$0
External dev cost
Live
Before the meeting

The Challenge

A recruitment industry partner had a meeting scheduled with an interested company on Thursday afternoon. They needed to demonstrate real, working AI tools — not mockups or pitch decks. The ask: show that AI can genuinely help professional services businesses with document review, client reporting, and customer communication.

The timeline was non-negotiable. Two days to go from concept to three deployed, paying-ready SaaS applications.

The Solution

We built three standalone SaaS applications, each solving a real business problem:

📄

AI Document Review

docs.sparrofox.com

Upload contracts, policies, or compliance documents. AI analyses the full text and returns structured feedback — risks, missing clauses, plain-English summaries, and actionable recommendations.

PDF/DOCX upload Risk scoring Clause extraction Export reports
📊

AI Client Reports

reports.sparrofox.com

Paste raw data, meeting notes, or project updates. AI generates polished client-ready reports with executive summaries, key metrics, risk flags, and next steps — ready to send.

Multiple report types Executive summaries Branded output One-click export
💬

AI Business Assistant

assistant.sparrofox.com

A configurable AI chatbot trained on your business — FAQs, services, pricing, processes. Embed on your site or use standalone. Multi-tenant: each business gets its own trained assistant.

Custom training FAQ management Service catalog Multi-tenant

Tech Stack

Backend

Python · FastAPI · SQLite · Claude AI (Anthropic)

Frontend

Vanilla JavaScript SPA · Responsive CSS · No framework overhead

Payments

Stripe + PayPal · Token-based billing · Shared payment gateway

Infrastructure

Docker containers · Cloudflare Tunnels · SSL · Custom domains

The Overnight Build Advantage

Speed came from smart architecture decisions, not cutting corners:

  • Shared payment gateway — one Stripe integration serves all three apps. Buy tokens once, they credit across the platform.
  • Token-based billing — simple usage model (Starter 50/$19, Pro 200/$59, Business 500/$119 AUD). No subscription complexity for MVP.
  • Consistent stack — FastAPI + SQLite + vanilla JS across all three. One pattern, three products.
  • Containerised from day one — each app runs in its own Docker container with Cloudflare Tunnel to a custom domain. Zero-downtime deploys.
  • AI does the heavy lifting — Claude handles document analysis, report generation, and conversation. The apps are well-engineered wrappers around genuine AI capability.

The Outcome

All three applications were live and demo-ready before the Thursday meeting. The client saw real products — not wireframes, not pitch decks. They could log in, upload a document, generate a report, and chat with a trained AI assistant.

"We walked into that meeting with three live applications. The company could try them on the spot. That changed the entire conversation from 'what could you do' to 'when can we start'."

— Project Lead

48-Hour Timeline

Tuesday Evening

Brief received. Architecture designed. Shared payment gateway scaffolded. Document Review (highest priority) started.

Wednesday Morning

Document Review deployed and tested. Client Reports started. Token billing system integrated across payment gateway.

Wednesday Afternoon

Client Reports deployed. Business Assistant started. Stripe + PayPal payment flows tested end-to-end.

Wednesday Night

Business Assistant deployed. All three apps on custom domains via Cloudflare Tunnels. Demo account configured. Full end-to-end testing complete.

Thursday 1:30 PM — Meeting

Live demo delivered. All three apps demonstrated with real data. Partnership discussions escalated.

Key Takeaways

🎯

Ship, then polish

A working demo beats a perfect mockup. Real products change conversations.

🔧

Shared infrastructure

One payment gateway, one auth pattern, one deployment pipeline — three products.

🐉

AI-native development

AI agents built the code. AI powers the products. Speed is the feature.

Need something built by tomorrow?

We take 2-3 overnight projects per week. Brief us by 5pm, review the build by 9am.

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