A B2B SaaS MVP in 2026 takes 2–4 weeks when you pair a senior engineer with Claude Code. The pattern below is how we consistently hit that window for our clients.
Updated: April 24, 2026
Day 1: CLAUDE.md, stack decision, repo scaffold. Day 2–3: Auth, tenant model, base database schema. Day 4–5: First real CRUD feature end-to-end, complete with tests. The agent handles 80% of the code; you handle architecture and review.
Three to five real features, each on its own branch. Wire Stripe billing via the MCP server. Build the admin panel for the client's operations team. Deploy to staging. Invite the first paying design partner.
Observability (Sentry, structured logs), rate limiting, rate cards for each plan, onboarding flow, email transactional. Run /security-review on every PR before merge.
Production deploy, DNS, monitoring dashboards, runbooks. Train the client's in-house team (or agency successor) on the CLAUDE.md and slash commands. By Friday the SaaS is live and charging.
One senior engineer plus product ownership. We have shipped it with two engineers when scope is large; beyond that, coordination overhead kicks in.