Tellum is a systems integrator
for security contractors.
Business systems, not panels.
Your installs, your monitored base, your engineers and your cash live in different places — and someone has to stitch them together every week.
We join what you already run into one live picture.
Nothing gets replaced.
- SimPRO
- Sage
- ARC platform
- Email & WhatsApp
- +156 systems →
- Installs — margin live
- Monitored base — revenue and churn
- Cash — month-end builds itself
- SimPRO
- Sage
- ARC platform
- Email & WhatsApp
- +156 systems →
- Installs — margin live
- Monitored base — revenue and churn
- Cash — month-end builds itself
The systems your security business already runs on.
If it's on this list, we've connected it before. If it isn't, we probably still have — .
You're not unusual. This is what running a contractor at this stage looks like.
“Same site, three systems, three different numbers. I spend Friday afternoons working out which one is right.”
That's plumbing, not people. We fix the plumbing.
“The sites we monitor and the sites we invoice are two different lists. Nobody can tell me the difference without a week's work.”
Your monitored base is the asset the company is valued on. It shouldn't take a week to say what's on it.
“Month-end takes the FD a week and one spreadsheet nobody else understands.”
Month-end shouldn't be a build project. It should already be there.
Wherever you are with your systems, there's a version of this for you.
You're picking or replacing something.
We help you choose the tools that fit how you actually work — not the ones the salesman liked. Shortlist, trial, decision. Then we set them up properly.
You already have the tools. They don't talk, or they don't do enough.
We customise, connect and extend what you run: integrations, missing reports, automations, the layer on top. Then we keep it working and growing with you.
You have the systems. People use half of them.
We teach your team to run the tools you already pay for — properly, and with the automations that make them worth the money.
Most clients start in the middle. Some start with training and never need the rest.
Tools get you level. The layer gets you ahead.
Choosing, connecting and training put the right tools in place — the same tools your competitor can buy. The Tellum Operating Layer is ours: it sits on top of what you run and bends to how you work. A new metric lands in days, a new workflow in a week or two. Nothing gets replaced.
One live picture. Three things on it.
Every install, cost-to-date against budget — labour, equipment and subcontract — updated as costs land, with variations and extras where you can see them.
Nothing gets replaced. Your ERP stays your ERP. We add the layer on top.
Small first step. No migration. Nobody retrains.
We sign an NDA, then walk you through what we'd connect and how. A demo, not a sales call.
We pick the right technical approach and build a working prototype on your numbers — free, typically within 48 hours. Static data at this stage; the live connection comes with the build. You decide if it's worth going further.
Implementation, customisation, the connecting layer, training — the actual engagement begins. Your systems stay where they are; your team keeps working the way it works.
Before and after
Examples of what we can help you with — real engagements, anonymised, names and some details changed.
6 of 6 engagements
About to buy an ERP they'd have spent a year fighting.
Sage 50, a dozen spreadsheets and a WhatsApp group.
SimPRO for installs and service, Sage kept for the books, one contract tracker — live in six weeks.
Project controls lived in an eight-tab workbook next to the ERP.
NetSuite for finance, Excel for procurement, cost-to-complete and variations.
One portal on top of NetSuite — cost-to-complete per install, variations captured the day they happen, finance stays in NetSuite.
Nobody could state the recurring base without a week of reconciliation.
Monitoring in the ARC platform, billing in Intacct, cancellations noticed at renewal.
One board: monitored versus invoiced sites, recurring revenue and churn by client, renewals due, and sites at risk on false-call history.
Nobody could see engineer recommendations turning into quotes and quotes turning into work.
Money in QuickBooks, pipeline in HubSpot, the maintenance schedule in a spreadsheet.
One weekly picture: renewals, recommendation-to-job conversion, engineer utilisation, cash by branch.
Accreditation audits meant three weeks of assembling evidence by hand.
Certificates, engineer competencies and maintenance records spread across folders and inboxes.
One audit pack: maintenance visits, certificates, competencies and evidence files, assembled from the systems — plus safety and workforce reporting alongside.
Three acquisitions, three field systems, and no single view of the recurring base.
Consolidating P&L and recurring revenue by branch took most of the month.
A consolidation layer on Intacct — common contract structure, recurring base and month-end across all entities in days.
Want to see the layer itself? Same numbers, three front-ends — inside NetSuite, as a modern portal, as Power Apps.
You're probably here the way most of our clients arrive — a colleague passed our name on, or you got a note from me. Either way, good to meet you. If the page doesn't answer your question, ask me directly — I read every reply myself.
Questions we get asked
The stack we see most often in security & access: SimPRO, Joblogic, Uptick, Protean, Immix, Sage — plus Excel, Microsoft 365 and WhatsApp. In total we work with around 160 systems across 21 categories, listed at tellum.works/vendors. If a system has an API, a database or an export, it can be connected.
Pick your first step.
From a free PDF to a working prototype on your own numbers in 48 hours. Pick one — the form below adjusts.