We design, build and scale multi-tenant SaaS platforms — from a first release that proves the market to an architecture that holds up under enterprise buyers, real security reviews and ten times the load.
45 minutes with a principal engineer. Bring an idea, a codebase or a stalled roadmap — you will leave with a straight answer about what to build and what to fix first.
We are usually called in at the point where one of these has already happened. All four are cheaper to design against at the start than to fix at scale.
It got you to first revenue, then every new feature took twice as long as the last, and now a rewrite is on the table.
They want SSO, audit logs, role-based permissions, data residency and a completed security questionnaire. You have none of it.
Nobody designed for cost, so the infrastructure bill grows with usage in a way the pricing model never anticipated.
Undocumented code, no handover, no tests, and a dependency you cannot leave without starting again.
The outcomes we design towards from the first sprint, agreed in the architecture review before anyone writes code.
In real customers' hands, on foundations that will carry version five rather than a prototype you throw away.
Working software demoed every fortnight, so you always know exactly what your money bought.
Code, designs, infrastructure and documentation in your repositories and your cloud account from the first commit.
The same senior technical owner on your account from the first call through to handover.
Move the sliders to match what you have in mind. A rough shape only — the architecture review gives you a real sequence and a real timeline.
Assumes a dedicated cross-functional squad and a decision-maker available weekly. Scope discipline moves this number more than team size does.
Product engineering with commercial instincts — because architecture decisions are pricing, sales and hiring decisions in disguise.
The smallest thing that proves the market, built on foundations that will carry version five — not a prototype you have to throw away.
Tenant isolation, subscription billing, usage metering, provisioning, admin tooling and the operational plumbing every SaaS eventually needs.
SSO and SCIM, role-based access control, audit trails, data residency, penetration testing and the evidence pack that gets you through security review.
Legacy monoliths untangled, technical debt paid down in a sequence that keeps shipping features, stalled builds diagnosed and restarted.
Copilots, semantic search, generative workflows and agents designed into your product as differentiators, with unit economics that work at scale.
A cross-functional squad — product, design, engineering, QA and DevOps — working to your roadmap and inside your process.
Every engagement is designed as a system, not a feature. This is the shape of it — reviewed and agreed with you before a line of code is written.
Every engagement follows the same five stages, so you always know where you are, what comes next and what you are paying for. No mystery, no drift.
User research, competitive reality check, and scope cut hard to what genuinely proves the thesis.
Weeks 1–2Roadmap, success measures and the commercial constraints — pricing, tenancy, compliance — written down.
Week 2Multi-tenancy, data model, security, cost per tenant and the user experience, decided before code.
Weeks 2–4Two-week sprints with working software demoed every fortnight, CI/CD and tests from sprint one.
Weeks 4–12Performance, observability, enterprise controls, cost tuning — and a clean handover to your team.
Week 12 onwardWe pick boring, well-supported technology for the parts that must last, and we are happy to explain any choice to your CTO, your investors or your next engineering hire.
Most agencies optimise for the build. We optimise for what you own when the build ends — because that is what decides whether version five ships in a fortnight or a quarter. Six reasons that matters:
FITSOL is the trading name of Future IT Consultancy Limited, registered in England & Wales (No. 07644491), headquartered in Manchester and delivering across the UK and United States.
Bring an idea, a codebase or a roadmap that has stalled. Forty-five minutes with a principal engineer and you will know what to build first, what it will cost you in time, and which decisions you cannot afford to defer.
Tell us where you are starting from and we will bring the right principal engineer.