Built for the way field service teams actually work.
Engineer OS started as a custom build for a UK fire and security contractor. They were running their team on WhatsApp threads, Word forms, and a JobLogic instance that nobody actually used because the mobile app was unusable in the field.
We built them something better. A phone-first PWA the engineers actually opened, digital forms that worked one-handed in the rain, and a job feed that admins and engineers were both looking at. After a few months it was obvious the same tool fit dozens of small UK field service operations: fire, electrical, plumbing, HVAC, security, refrigeration. Anyone with five to a hundred engineers and a calendar full of jobs.
That’s Engineer OS. Same core product, multi-tenant from day one, sold per-engineer-per-month. Modern stack, mobile-first by default, and priced well below JobLogic.
What Engineer OS does
Engineer OS handles the whole loop of a field service job. The office raises a job against a customer and site, drags it onto the calendar and assigns one or more engineers. It lands on their phone with the site details and the right form attached.
On site the engineer fills in the form one-handed, adds photos, and the customer signs the screen. A branded PDF goes to the customer, and the quote or invoice is raised from the same record and syncs to Xero or QuickBooks. Planned maintenance visits come from the contract, so PPM stops living in a spreadsheet.
The app loads quickly on a weak signal because its shell is cached, but submitting forms and uploading photos needs a connection today. Queued offline submission is on our roadmap.
Who it suits, and who it doesn’t
A good fit
UK contractors with 5 to 100 engineers doing reactive and planned work in certificate-heavy trades, with engineers on phones, currently held together by WhatsApp and spreadsheets or stuck on a system the engineers avoid.
Not a good fit
Sole traders who want something free, national operations needing full ERP with procurement and project accounting, and engineering managers looking for the other EngineerOS (see below).
Not the other EngineerOS
The name is shared with unrelated products, including a dashboard for software engineering managers at engineeros.app and several open-source developer tools. Engineer OSat engineeros.uk is job management software for trades and field service firms. If the site talks about fire alarm certificates, engineer calendars and PPM contracts, it’s us.
Who’s behind it
Engineer OS is built and run by Rob Harvey through Trailhead Holdings Ltd, a UK company registered with the ICO (C1990040). Every demo and setup call is with Rob, and questions go straight to him through the contact page.
The incumbent tools haven't moved.
JobLogic and ServiceM8 were built for another era.
Built for the desktop, with a mobile view bolted on later. The engineer flow shows it. It works, technically, but it doesn’t feel like an app you’d choose to use.
The new ones are too expensive or too thin.
The newer entrants either price themselves for North America or skip the bits that actually matter to UK trades (VAT, certs, PPM, customer portal).
The mobile-first promise is rarely real.
Most “mobile-first” SaaS is actually web-first with a mobile-responsive layer. We built the engineer side for the phone first and ported up. The difference is felt in the field.
Multi-tenancy from day one.
We started as a single-tenant app for one customer, then rebuilt the tenancy model into the database itself. Your data isn’t isolated by an ifstatement, it’s isolated by Postgres row-level security on every table.
UK field service operations with five to a hundred engineers.
Fire & security
Electrical contractors
HVAC and refrigeration
Plumbing & gas
Security & access control
Building services
Outside the UK? Get in touch, we’re working on Ireland and Australia next.
Have a look around.
Start your 14-day trial or book a walkthrough. We’d love to hear what you’d want from a tool like this.