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Devinity Solutions

SaaS & Software Products

The difference between a working application and a sellable SaaS product is mostly the parts nobody demos: tenant isolation, billing that handles upgrades and refunds correctly, permissions that survive an enterprise buyer's security review, and admin tooling so support does not need an engineer.

We build and scale SaaS products: multi-tenant architecture, billing, roles and permissions, admin tooling and the operational layer a product needs before it can support paying customers. We run four of our own products, so we build from operational experience.

The difference between a working application and a sellable SaaS product is mostly the parts nobody demos: tenant isolation, billing that handles upgrades and refunds correctly, permissions that survive an enterprise buyer's security review, and admin tooling so support does not need an engineer.

Those parts are also where technical debt compounds fastest if they are deferred.

What tends to be hard

Multi-tenancy done properly

Tenant isolation is an architectural decision that is expensive to reverse. It should be made deliberately at the start.

Billing that handles reality

Upgrades, downgrades, proration, failed payments, refunds and tax. Each edge case ignored becomes a support ticket and a revenue discrepancy.

Enterprise readiness

SSO, audit logs, role granularity and data export. These arrive as blockers during procurement rather than as feature requests.

Cost per customer

Infrastructure and AI inference costs that scale with usage need instrumenting early, otherwise gross margin erodes invisibly.

FAQ

SaaS & Software Products — questions

Can you take an existing product and scale it?
Frequently. We start with a technical audit covering architecture, test coverage, dependencies, security and cost, then give an honest assessment of what needs replacing and what can be carried forward.
Do you build MVPs?
Yes, though we try to build a first release rather than a throwaway prototype. The distinction matters: prototypes get shipped to real customers more often than anyone plans for.
How do you handle AI costs in a SaaS product?
By instrumenting cost per request from the start and designing around it — caching, routing simpler requests to smaller models, and setting per-tenant limits so a single customer cannot make a plan unprofitable.

Tell us what you are trying to build.

A thirty-minute call is usually enough to tell you whether we are the right firm for it. If we are not, we will say so and point you somewhere better.

Or reach us directly: [email protected] · +1 321 335 0265