Mettle

Stream

Platforms and infrastructure

Built to specification and changed step by step into platforms that keep running.

Over 700 millionsensor reports to date on the platform Joakim built

Sensors in the field must report for years, and an alarm only counts when it reaches a person. Behind them is a platform that has to move to new data models and new servers while it keeps running.

TermoSense, the temperature-monitoring service of SensiNet, watches grocery stores, research labs and the heating of buses at depots.

Mettle works on the whole chain, from the gateway in the field to the alarm, and changes it in steps while it runs.

Packages

A scope and a price agreed before each phase starts. Joakim leads every package in person.

Sensors and alarms

Delivery Typically from 4 weeks

Devices in the field that must report, and alarms that must reach a person.

You get

  • Your devices operated from gateway to alarm, with updates tried on a few devices first
  • An alert when a device or a gateway goes quiet

Previously

About 25 gateway releases from June to September 2026, staged through a preview channel and a canary box before the rest of the fleet. TermoSense, 2026

Available advisorWhere Joakim has done it 

Ask about this Read about the package

Built to your specification

Delivery Typically from 3 months

A system or a platform you need built, to a specification you can hold the work to.

You get

  • A specification agreed before the build, and releases you can test as they come
  • Running in the cloud or on your own servers, with an alert when something stops

Previously

Replaced the laptop wired to the sensor receiver at each installation with a small Linux gateway I built, and ran it beside the old set-up as a live trial before the switch. TermoSense, 2009

Available advisorWhere Joakim has done it 

Ask about this Read about the package

Also useful in this stream

Approach

See all
  1. Run the new beside the oldA change runs beside what it replaces until it has proved itself. When the platform moved to Google Cloud in 2020, the database was replicated to a new database beside the old one.
  2. A few first, then the fleetSince 2014 Joakim has tested locally first and rolled out step by step. About 25 gateway releases from June to September 2026 went first to a preview group and one test gateway in the field, then to the rest of the fleet.
  3. Alarm when it goes quietFrom July 2009 the platform sent an SMS when a gateway stopped answering. In 2026 Joakim added alerts that fire when a regular check-in stops, and the new gateways stay reachable for recovery when they go quiet.

Cases

See all
TermoSense, 2009Linux gateways replaced the laptops, after a live trialAt SensiNet, each installation used a full laptop to reach a temperature receiver over USB and pass the readings on to a server. In 2008 Joakim was asked whether small Linux boxes, reflashed for a home-automation hobby, could take over that job.Read the case TermoSense, 2011The data model followed the new hardwareIn 2011 SensiNet brought out hardware with several sensors per device. The platform assumed one sensor per device, so the model had to change with it.

Over 23 million reports moved to the new model

Read the case TermoSense, 2026Platform modernised while the alarms kept runningIn 2026 the platform had run for 18 years and was on PHP 7.4, with gateways on a design from 2010: a VPN, an old web-service protocol (SOAP) and polling. It had to be brought up to date without stopping the alarms.

143 s → 1.3 s time for one query that counts alarms, on the live database

Read the case

Courses

Talks

Coaching

Get in touch

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Other streams

Leadership and collaborationProduct managementTrustworthy AIRegulation and compliance