# Categories

- [Payments](https://venuspaneliya.com/categories/payments/): Stripe Connect, PayPal and Authorize.net: creator payouts, payout ledgers and real-money play.
- [AI engineering](https://venuspaneliya.com/categories/ai-engineering/): OpenAI and Claude APIs, RAG, agents and MCP, with token and cost controls that keep AI spend flat.
- [Cloud](https://venuspaneliya.com/categories/cloud/): AWS Lambda, SQS and S3, Google Cloud, Docker and CI/CD, sized to the budget.
- [Fintech](https://venuspaneliya.com/categories/fintech/): Quote engines and payroll calculation, where a wrong number costs someone money.
- [SaaS](https://venuspaneliya.com/categories/saas/): Multi-tenancy, data isolation, roles and the architecture AI tools skip.
- [Security](https://venuspaneliya.com/categories/security/): Rate limits, tenant isolation, access control and what enterprise procurement asks for.
- [Founders](https://venuspaneliya.com/categories/founders/): Notes for founders on hiring, cost and checking a codebase without reading it.