Software products · Engineering services

Engineered from first principles.

Aetion builds focused SaaS tools for developers and operators, and lends the same engineers to teams with systems that need to be faster, cheaper to run, or able to take ten times the load.

For buildersExplore our toolsEarly-access tools with free trials and a live sandbox.Browse products → For teamsHire our engineering teamAudits, rebuilds and scaling work, priced up front.See services →

Three symptoms, one cause. We fix the cause.

2026Founded. A small, independent studio

1 dayReply time on every project enquiry

FixedPrice and scope agreed before work starts

100%Of the code and docs are yours at handover

Products

Tools in early access

We're building these alongside our client work. Early users get launch pricing and a direct line to the engineers.

All products →

Engineering services

When the system itself is the problem

Have a system that's slow, expensive or fragile?

Get an estimate in under a minute, then book a 30-minute diagnosis call.

Estimate your project

Engineering services

We find the cause before we write the code

Fixed-scope engagements with a measurable target agreed before work starts. You talk directly to the engineers doing the work.

Methodology

How a first-principles engagement runs

The order matters. Most failed rewrites skip straight to step four.

Step 1

Observe

Instrument the system as it runs today. Traces, query plans, cost per request. No opinions yet.

Step 2

Decompose

Break each symptom into the smallest facts we can verify, and the assumptions nobody has checked.

Step 3

Isolate the cause

Reproduce the failure on purpose. If we can't trigger it, we haven't found it.

Step 4

Engineer

Change the least code that removes the cause, behind a flag, with a rollback path.

Step 5

Measure

Compare against the step-one baseline and report the result in money and milliseconds.

Problems we take on

Symptom, likely cause, fix, what we measure

We're a new studio, so instead of borrowed success stories, here are the kinds of problems we're built for and how we'd approach them.

Project estimator

What would your project cost?

A rough, indicative range to help you plan. The diagnosis call turns it into a fixed quote.

Type of work Technical complexity 3 · Moderate Third-party integrations 2

Delivery pace

Estimated budget

Estimated timeline

Book a diagnosis call

Start a project

Tell us about the system

Three short steps. A principal engineer reads every brief.

Step 1 of 3 · The problem

Build something new Make it faster or cheaper Handle more load Untangle legacy code

What's going wrong, in your words?

Your brief is ready

In production this goes straight to HubSpot and books a call. This prototype doesn't send anything, so copy the brief if you want to keep it.