Margintall
B2B SaaS prototype: 3 platforms, 1 codebase, 32 endpoints
Results
- 3 platforms from 1 codebase
- 32 REST endpoints
- 2 accounting integrations
- Built solo in about three months
Context
Margintall was my own fintech startup: a B2B SaaS prototype that pulls accounting data in and sorts transactions automatically. I was product owner and sole engineer, April to June 2026.
What I did
- 01Architected one codebase serving iOS, Android and web
- 02Built 32 REST API endpoints
- 03Integrated QuickBooks and Zoho Books via OAuth
- 04Built a GPT-based transaction categorisation engine in Python
Stack
Cross-platform single codebase / Python / GPT / OpenAI / REST API / OAuth / Replit
Related service
AI-built MVPs and prototypes →AI features and integrations →AI workflow enablement →
More work
04 / Contact
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