Invoice clients for SaaS product development, subscription billing, and multi-tenant architecture. Professional invoices from Tidybill.
A SaaS developer invoice covers work building software-as-a-service products, including multi-tenant architecture, subscription billing integration, user management systems, API development, and the full-stack engineering required to launch and scale a web-based product. SaaS developers often work with startups or established businesses launching new digital products, and they may be responsible for the entire technical stack from database to frontend. Key billable components include product discovery, architecture design, core feature development, subscription and payment integration (Stripe, Paddle), multi-tenancy implementation, admin dashboards, and infrastructure setup. Because SaaS products require ongoing development after launch, transitioning clients to a retainer model post-launch is common.
| Service | Typical Rate | Unit |
|---|---|---|
| SaaS product development (day rate) | 700 | day |
| SaaS MVP build | 15000 | project |
| Subscription billing integration (Stripe) | 1500 | project |
| Multi-tenant architecture implementation | 3000 | project |
| API development and documentation | 2000 | project |
| Post-launch development retainer (monthly) | 2500 | month |
Use milestone invoicing for large builds: deposit at contract signing, payments at key milestones (authentication complete, core features complete, subscription billing live, launch), and ongoing monthly retainer post-launch. For retainer work, invoice monthly with a sprint summary of features shipped. Always define what is included in the MVP scope in the contract to avoid scope disputes.