How We Built an AI SaaS on the Edge for Nearly $0 in Infrastructure Costs

Short summary

Propoza, an AI SaaS for Brazilian freelancers generating business proposals, demonstrates edge infrastructure can reduce costs from $10–90/month to nearly $0 using Cloudflare Workers and D1. The architecture delivers sub-50ms latency across Brazil with automatic scaling, trading Node.js ecosystem compatibility for native V8 serverless benefits. A technical walkthrough covers framework choices (Hono, Zod, LLM API caching), honest lessons on database consistency trade-offs, and practical constraints discovered in production.

• •Cloudflare Workers + D1 (SQLite) reduce SaaS infrastructure from $10–90/month to nearly $0
• •Edge runtime delivers <50ms latency across Brazil; auto-scales without manual intervention
• •Trade-offs: Node.js ecosystem incompatible, eventual consistency on writes, some SQL operations unsupported

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