Engineering & design studio · Cheltenham, UK

Software built carefully, for places where it has to work.

Three senior founders. Defence, national security, enterprise software.

— Heritage
BAE Systems Lockheed Martin Velo Payments
01 / Work

Three practices.
One standard.

We take on problems where engineering depth and design care both matter. Every engagement is touched by one of the three of us — no juniors on your programme, no offshoring, no handoffs to a team you haven't met.

PRACTICE 02·COMMERCIAL

Product & web engineering, built properly.

Bespoke work for startups, scale-ups and established businesses.

Not "a website" — actual engineering and design craft applied to whatever the client is trying to do. Internal tools, modern web applications, AI-enabled features, built the first time.

React · TypeScriptDesign systemsAI features
In development · 2026 · Q3 →
PRACTICE 03·OUR OWN TOOLS

Small, affordable, AI-enabled tools.

Built for businesses that can't justify US-built SaaS prices.

The first helps small companies improve their web presence without a marketing agency. Draft-and-approval loops so a human stays in control.

AI-enabledUK-builtHuman-reviewed
02 / Team

Three founders.
Shared heritage.

Two of us were at BAE Systems Applied Intelligence at the same time. Two of us overlapped at Velo Payments. Tri-Iron is what happens when you put three people who already know how each other build things into the same room and let them pick their own work.

Founder
Developer

Gareth P.

Currently CTO of Naismiths. Ex-Head of Frontend at BAE Systems Applied Intelligence and Velo Payments. 16+ years in application development across cyber security, open banking and property analytics.

BAE AIVelo PaymentsNaismithsN3 Tech
Founder
Designer

James N.

Senior UX/UI. Led product design at CyberSmart; senior visual UX at Velo Payments; UX at BAE Systems Applied Intelligence and ADP. Builds design systems that take year-long projects down to three months.

CyberSmartVelo PaymentsBAE AIADP
Founder
Developer

Ben S.

Full-stack engineer, currently contracted to Lockheed Martin as a senior frontend developer. Previously at BAE Systems and Deep3. React, Node, TypeScript, and the kind of work that doesn't get talked about publicly.

Lockheed MartinBAE SystemsDeep3
— 03 / Ethos

How we work.

  • No. 01Founders on every engagement. One of the three of us touches every piece of work, from kickoff to ship. No handoffs, no offshoring.
  • No. 02Simplicity as a deliverable. Anyone can add features. Restraint is the harder, rarer thing — and it's what we sell.
  • No. 03Only work we can staff ourselves. Small on purpose. If the three of us can't do it directly, it isn't Tri-Iron work.
04 / Contact

Tell us
what you're
working on.

One paragraph is usually enough. We reply personally, usually within a couple of days. No booking widgets, no newsletter signup.

Location
Cheltenham, Gloucestershire, UK
Engagement
Direct · sub to prime · via framework
› The more concrete, the better. We'll reply with questions, not a sales deck.
› Thanks — your note is on its way. One of us will come back to you.