Services / Software Development / SaaS

SaaS Product Development Company: from product idea to a multi-tenant platform your customers pay for.

We build SaaS products end to end. Architecture, billing, and the operational tooling to run a subscription business, not just an app.

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Our Methodology

Built to scale from your first customer to your millionth.

Discover

Validate the multi-tenant architecture your growth plan needs.

Design & Build

Billing, auth, and core product built for scale from day one.

Pilot & Verify

A beta cohort stress-tests the platform under real usage.

Scale & Operate

Infrastructure and cost model tuned as your user base grows.

Proof, Not Promises

Real engagements, the results attached to each one.

Billing close time down from 6 days to 4 hours

Developer tools SaaS, Boston

Failover time cut from an estimated 4+ hours to 6 minutes

Healthtech scheduling platform, Texas

Licence-related sales emails reduced by roughly 85%

B2B software firm, Cambridge

Cut-over completed with 4 minutes of planned downtime

Workforce scheduling SaaS firm, Manchester

What's Included

4 capabilities, one delivery team.

SaaS Architecture & Multi-Tenancy
Tenant isolation and data models designed to scale from 10 to 10,000 accounts.
Subscription & Billing Systems
Metering, invoicing, and plan management built to handle upgrades and churn.
Product Engineering
Feature delivery paced to your roadmap, not a fixed-scope contract.
Platform Scaling
Infrastructure and cost models that hold up as your customer base grows.

The stack behind this service.

Real tools our team works in day to day, not a generic capability list.

Node.js
PostgreSQL
Stripe
Docker
AWS

Ten industries. One audited standard.

Different regulations, different systems of record — the same discipline every time: agents that run inside guardrails and leave a record you can read.

View all industries →

SaaS case studies

Challenge, solution, results. What we have shipped here.

Anonymised at the client's request. Each card states the pain point, what we built, and what changed. Plus the service type and country.

04 studies
Web USA

Usage-based billing migration for a Boston DevTools SaaS

Developer tools SaaS, Boston

Challenge
The product priced on flat per-seat tiers while usage per account varied by 40x. Finance reconciled Stripe, the metering spreadsheet and the CRM by hand each month, closing was slow, and the sales team had no way to quote consumption-based deals without an engineer.
Solution
AGS built an event-based metering pipeline that aggregates usage per account per hour, feeds a rating engine, and syncs invoices to Stripe and the CRM automatically. Sales gets a self-serve quoting tool that reads live usage instead of guessing at seat counts.
Results
  • Billing close time down from 6 days to 4 hours
  • Metering pipeline processes 40M events/day at p99 under 90s
  • Usage-based deals now 34% of new ARR within 2 quarters
Service type · WebCountry · USA
Web USA

Multi-region failover for a healthtech scheduling SaaS

Healthtech scheduling platform, Texas

Challenge
A single-region deployment meant a regional outage would take every clinic customer offline during patient hours. The board had flagged it as a renewal risk after a competitor's outage made the news, but the app's session and scheduling logic assumed one primary database.
Solution
We re-architected session state to be region-portable, added a warm standby with continuous replication, and built automated failover with health checks and a runbook the on-call engineer can trigger in one command. We ran two live failover drills before go-live.
Results
  • Failover time cut from an estimated 4+ hours to 6 minutes
  • Zero data loss across 2 live failover drills
  • SOC 2 availability commitment raised to 99.95%
Service type · WebCountry · USA
Web UK

Developer documentation and licensing portal for a software firm

B2B software firm, Cambridge

Challenge
Customers downloaded licence files by emailing sales, documentation lived in a wiki that nobody owned, and renewals were tracked in a CRM that did not know which version each customer was running. Engineering fielded about 40 support emails a week that were really documentation questions.
Solution
We built a customer portal where licences are generated, renewed and revoked automatically against the CRM, and documentation is published from the product repository on every release through a CI pipeline. Usage of each page is measured so the team can see which topics generate support traffic.
Results
  • Licence-related sales emails reduced by roughly 85%
  • Documentation-related support emails down from 40 to 12 a week
  • Docs now publish within 10 minutes of each release tag
Service type · WebCountry · UK
Web UK

Zero-downtime Azure migration for a Manchester scheduling SaaS

Workforce scheduling SaaS firm, Manchester

Challenge
The platform ran on two rented servers in a colocation facility. A disk failure had caused a nine-hour outage, customers were asking about resilience in procurement questionnaires, and the engineering team of six had no capacity to plan a migration while shipping features.
Solution
AGS designed an Azure landing zone with infrastructure as code, containerised the application and moved the database using replication so cut-over happened in a maintenance window of minutes. We ran two rehearsals, handed over runbooks and stayed on for hypercare for the first month.
Results
  • Cut-over completed with 4 minutes of planned downtime
  • Monthly hosting cost down 23% against colocation
  • Migration delivered in 9 weeks
Service type · WebCountry · UK

FAQ

SaaS: questions, answered.

What does AGS mean by end-to-end SaaS development?

AGS builds SaaS products end to end. Not just an app, but the business around it. That means multi-tenant architecture, subscription and billing systems handling metering and churn, product engineering paced to your roadmap, and the platform scaling to run a subscription business. We take you from product idea to a platform your customers pay for.

What is multi-tenancy and why does it matter for SaaS?

Multi-tenancy is how one platform serves many customer accounts with proper tenant isolation and data separation. It matters because retrofitting it later is painful and risky. AGS designs tenant isolation and data models to scale from 10 to 10,000 accounts from day one, so your architecture supports growth instead of fighting it.

Can AGS build the billing and subscription side, not just the product?

Yes. We build metering, invoicing, and plan management designed to handle upgrades, downgrades, and churn. The operational tooling to run a subscription business, not just an app. Billing and auth are built for scale from day one, alongside the core product, so your first paying customer and your millionth both work.

How does AGS make sure a SaaS platform scales?

We validate the multi-tenant architecture your growth plan needs up front, then stress-test it with a real beta cohort before launch and tune the infrastructure and cost model as your user base grows. Our Nimbus Cloud Software re-architecture supported 5x user growth. Autonomous agents can be embedded to run operational tasks as the platform scales.

Build the platform, not just the app.

Tell us what you're building and we'll map the fastest path to it.

Let's talk