SaaS development · Three Index
SaaS platforms built to be sold.
Custom multi-tenant SaaS — architecture, roles, billing and onboarding — with AWS (or GCP/Azure) infrastructure in accounts you own. Built in Ahmedabad for teams that need a product investors and customers can buy without painting the foundation into a corner.
- Team
- 50+ IT professionals
- Delivery
- Design, build, release, support
- Engagement
- Project or dedicated team
What this covers
Concrete work we take on under saas development — not a catalogue of buzzwords.
Subscription billing and plan entitlements
Admin, owner and member role systems
Onboarding, invitations and tenant provisioning
AWS environments, CI/CD and cost-aware cloud defaults with DevOps
Problems we take on
If one of these sounds familiar, we have likely shipped something close — and we will say so if we have not.
Your MVP was single-tenant and cannot become a real SaaS.
Billing and access control were bolted on late.
You need a product that many companies can buy, not a one-off build.
You need a realistic cost picture for building on AWS, not a brochure number.
Who this is for
This is for founders and product leads who will sell the same software to many organisations — including AI-first SaaS products built with a team in Ahmedabad. The buyer needs isolation between customers, a plan structure, AWS (or other cloud) environments they own, and a way for a new company to arrive without a deployment.
A one-off build for a single company is a web application engagement. Calling it SaaS because it is hosted is how teams paint themselves into a single-tenant model they later have to rip out.
How an engagement starts
Written scope
The written scope names the tenant, the roles inside it, the first plan or entitlement, the invite path and the AWS (or GCP/Azure) footprint for staging and production. It also names what is deliberately single-company in version one so nobody pretends isolation exists where it does not.
First increment
The first increment is one tenant that can sign up or be provisioned, invite a member, and hit a plan limit in the product. Billing is included when charging is part of that slice. A demo that only works for a hard-coded company is not the slice.
Decisions we make with you
A shared database with a tenant key is the usual start when customers share a schema and you need operational simplicity.
A stronger isolation boundary is the call when a customer’s contract, data class, or noisy-neighbour risk requires it.
We write that choice down before the tables are filled.
Fixed scope fits an MVP whose workflows and integrations are known. A dedicated team fits once the product is in market and priorities move every week. Billing bolted on after launch is more expensive than billing designed with the roles. DevOps and cloud work keeps CI/CD and AWS hygiene on the same roadmap as the product.
What you own
You own the repository, the cloud account, the payment-provider account, and the customer data. Tenant model, role matrix, and plan rules are documented in the repo so the next engineer can extend them without guessing which table is shared.
- You own
- Repository
- You own
- Cloud account
- You own
- Payment-provider account
- You own
- Customer data
Where this shows up
A workspace used by one organisation is a product. The same idea sold to many organisations is a SaaS, and the data model, invites, and billing have to be designed for that from the start.
Marketing campaign workspace
ViewMulti-tenant product workspace
ViewMarketing platforms
ViewA campaign workspace is the shape of that product on a single team’s roadmap. A multi-tenant workspace is the same idea sold to many organisations. Tenancy is a product decision on top of the domain, not a side effect of hosting.
Further reading
Cost of building a multi-tenant SaaS on AWS
Cost drivers and what belongs in a quote.
ReadSaaS multi-tenancy decisions that stick
Isolation, roles, and the choices that are expensive to reverse.
ReadTechnologies
Stacks we use when they fit the product and your team — not a mandatory toolkit for every engagement.
- Stack
- Next.js
- Stack
- Node.js
- Stack
- PostgreSQL
- Stack
- Stripe
- Stack
- Auth0/Cognito
- Stack
- AWS
- Stack
- Redis
How we work
Scope first, named engineers, biweekly demos, and you keep the repo.
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Scope before code
We write what is being built, what is excluded, integrations, dates and cost basis before the build starts. Changes get quoted before they get coded.
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Talk to the people doing the work
You meet named engineers and designers. There is no account manager translating technical questions in both directions.
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Working software every two weeks
Increments land on staging you can open and use. Progress you can click on beats progress in a status report.
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You own everything
Repository, cloud account, domains and credentials stay yours. We work in your accounts wherever possible.
FAQ
Answers specific to saas development — stacks, engagement and what we actually ship.
What does it cost to build a custom multi-tenant SaaS platform with AWS infrastructure?
Cost depends on tenancy model, billing depth, integrations, compliance and the AWS footprint. A first sellable multi-tenant slice — provisioning or signup, roles, one core workflow, plan limits and AWS environments you own — typically takes a small senior team several months; enterprise SSO, complex meters, heavy partner APIs or stricter isolation raise the range. Three Index quotes from a written scope with a cost basis — see our blog on multi-tenant SaaS build cost.
Do you set up AWS for the SaaS, or only write application code?
Both when the engagement needs it. Application work sits with SaaS development; pipelines, infrastructure as code and cost hygiene sit with DevOps and cloud — in your AWS account, with ownership staying yours.
Fixed price or dedicated team?
MVPs often start fixed-scope; ongoing product work usually fits a dedicated team better.
Do you help with product decisions?
We challenge scope that hurts delivery. Final product calls stay with you.
Do you build multi-tenant from day one?
When the product will be sold to many companies, yes. We design isolation, roles and billing early so you are not rewriting the foundation later.
Can you add billing and plans?
Yes — subscriptions, entitlements and plan limits are a normal part of the SaaS shape we ship.
What about onboarding and invitations?
Tenant provisioning, invites and role setup are part of making a SaaS sellable — we include them when the product needs them.
Related
Services that often sit beside saas development on the same roadmap.
Why Three Index
AI-first software development company in Ahmedabad. Founded 2020. Fifty-plus IT professionals. Five hundred-plus projects shipped.
We are a software engineering company: large enough to staff serious products and small enough that the people who wrote a module can still explain it. See how we operate, our AI development work, browse case studies, read the FAQ, or join the team.
Tell us what you are trying to build.
Send a short description of the project. You will get a reply from someone technical — with questions worth answering, not a brochure.