From idea to recurring revenue.
We've built SaaS products from scratch and know what it takes — multi-tenancy, billing, onboarding, performance at scale. We handle the hard parts so you can focus on growing your customer base.
Building a SaaS product is different from building a web app. Multi-tenancy means each customer's data must be perfectly isolated — and a bug in your access control isn't a support ticket, it's a breach. Subscription billing means handling proration, failed payments, upgrades, downgrades, and dunning. Onboarding means the product must explain itself without a sales rep in the room.
Flexonixs has taken SaaS products from founding team whiteboard session to $500K ARR. We know where the hidden complexity lives, and we build around it from day one rather than discovering it at month three.
We build with the tools that SaaS products are built with: PostgreSQL or MongoDB for data, Redis for caching and sessions, Stripe for billing, Next.js or React for the frontend, Node.js on the backend. We design multi-tenant from the schema level — not bolted on later.
What's included
- Multi-tenant architecture (schema-level isolation)
- Subscription billing (Stripe / Razorpay)
- User onboarding flows & in-app guides
- Role-based access control & team management
- Admin & analytics dashboards
- API & webhook infrastructure
- Usage metering & plan enforcement
- Scale & performance optimisation
Common questions
How do you handle multi-tenancy?
We implement tenant isolation at the database schema level — each tenant's data is partitioned so there's no possibility of cross-tenant data leakage through a query bug. We also implement application-level middleware that enforces tenant context on every request.
Which billing systems do you integrate?
Stripe for international billing (subscriptions, metered billing, usage-based pricing, invoicing). Razorpay for Indian billing. We've integrated both extensively and know the edge cases — failed payments, retries, proration, grace periods — all handled.
Can you build a SaaS MVP in 6 weeks?
Yes — we've done it more than a dozen times. The key is honest scope definition in week one. Core auth, a core workflow, Stripe billing, and basic admin. Everything else goes to a post-MVP roadmap. Founders who can make that trade-off ship. Those who can't are still building at month four.
Do you offer post-launch support and iteration?
Yes. Most of our SaaS clients continue with us after launch on a retainer or sprint-based model. We handle new features, performance issues, infrastructure scaling, and third-party integration changes. You get the same engineers who built it.
Let's build something
that matters.
Whether you have a fully formed spec or just a napkin sketch — we'd love to hear about it. First consultation is always free.