Cloud Applications (SaaS)
The decisions you make in month one set your cloud bill for years
Tenant isolation, data partitioning, billing model, region strategy. Cheap to choose correctly at the start; expensive and disruptive to change once you have paying customers on it.
- AWSAccredited partner
- ENSMedium category
- EUData residency
What we build
SaaS platforms that survive their own growth
Multi-tenant architecture
Tenant isolation chosen deliberately (shared, siloed or pooled per layer) with the trade-offs written down.
Subscriptions and billing
Plans, trials, seats, usage metering, proration, dunning. The unglamorous surface where SaaS revenue actually leaks.
Self-service onboarding
Sign-up to first value with no human in the loop, because a sales-assisted trial does not scale to volume.
Enterprise-readiness features
SSO, SCIM, audit logs, role models and data export: the checklist that unblocks your first large customer.
Infrastructure as code
Reproducible environments on AWS. Nothing important configured by hand in a console at 2am.
Cost observability
Cost attributed per tenant and per feature, so you can see gross margin instead of one undifferentiated bill.
How we work
Architecture first, because rework here is the expensive kind
Model the tenancy
How customers are separated in data, compute and identity. This single decision drives cost, compliance and blast radius.
Design for the pricing model
If you bill by usage, usage must be measurable and attributable from the first release rather than reconstructed later.
Build the platform slice
One tenant, one plan, one paid workflow, end to end in production, including billing actually charging a card.
Harden and scale
Load testing, autoscaling, backups with tested restores, and the runbooks that make an incident boring.
Cost control
Most cloud overspend comes from neglect, not architecture
Idle environments, oversized instances, storage tiers nobody revisited, logs retained forever, data crossing availability zones for no reason. None of it is exotic, and all of it compounds monthly.
We design for cost as a first-class constraint and we instrument it per tenant, so the question "is this customer profitable?" has an answer rather than an opinion.
It is a related enough problem that we run a dedicated AWS cost optimisation service for it. Sometimes the right first engagement is auditing the platform you already have rather than building a new one.
Common questions
What buyers ask about SaaS builds
Single-tenant or multi-tenant?
Multi-tenant is the default because it is what makes SaaS margins work: one deployment to operate, patch and monitor.
Single-tenant becomes right when customers contractually require isolation, or when regulation dictates where data physically sits. The strongest pattern is usually a multi-tenant core that can be deployed single-tenant for the few accounts that pay for it.
Which cloud provider?
We are deepest on AWS and hold AWS certification and partner accreditation, so that is where we add value fastest. The architecture patterns transfer to other providers, and we will say plainly when a preference is ours rather than a technical requirement.
Where will our customers' data live?
EU regions by default, with the option to add regions as you sell into markets that require local residency. Designing for that early is far cheaper than retrofitting it during an enterprise procurement review.
Can you help us pass a security review?
Yes, and it is a common reason clients arrive. We hold certification of conformity with the Spanish National Security Framework (ENS) at Medium category, and we build the audit logging, access control and documentation that enterprise questionnaires ask for.
We have a working prototype. Can you productionise it?
That is a service in its own right. See our AI SaaS production engineering page. We audit what exists, keep what is sound, and add the operability layer that turns it into something you can sell.
Planning a SaaS product, or fixing one?
One call with a senior cloud engineer. Bring your architecture diagram, or your AWS bill.