We build by leaving things out

We build by leaving things out

Most of what makes a WordPress site good is what we choose to leave out of it. WordPress runs a large part of the web on a big promise: whatever you need, there’s a plugin for it. That promise is one of its greatest appeals, and its most costly trap. Almost everything that harms a WordPress site...

Engineering
16h ago

Standardise the foundations, not the brand experience

Detailed work at scale comes down to one judgement: which parts of a project are worth building fresh for every brand, and which should be solved once and reused everywhere. Shared functionality on one side, brand expression on the other Engineering teams have plenty of frameworks and platforms to...

Engineering
8d ago
Putting video back where it belongs

Putting video back where it belongs

The problem with putting video in a git repo. The repo kept getting heavier, sprint after sprint. We were committing big MP4s next to the code, builds were slowing down, and deploys with them. Case studies lead with video, so every new client made it worse. We needed the media to live somewhere...

Engineering
22d ago
Twenty-four modules, one wrapper

Twenty-four modules, one wrapper

Every case study was its own Astro page. That was the first problem. Each page had its own layout logic, its own spacing decisions, its own way of handling full-bleed sections versus contained text. Some used inline styles. Some used one-off SCSS files. None of them agreed on what "default spacing"...

Design
1mo ago
The form we actually trust

The form we actually trust

In February 2026, we replaced our contact form with a submission pipeline we built and own. For the two years before that, it was a Pipedrive iframe inside our page. We had no control over fields, no client-side validation, no error handling beyond whatever Pipedrive showed inside its frame. When a...

Engineering
1mo ago
We test the revenue path

We test the revenue path

The contact form is the only page on this site that generates leads. So that's where the tests live. We don't chase coverage numbers. What we have is a targeted set of tests aimed at the things that would hurt if they broke: the forms, the pipeline that processes submissions and the CI that catches...

Engineering
1mo ago
Letting type move

Letting type move

We treat type as something that sits still — fixed in place, headings always the biggest thing, motion bolted on at the end. For one Creative Spark we dropped those rules and asked what type could do once it started moving. Creative Spark is our in-house R&D session: ninety minutes, a single theme,...

Engineering
17d ago
The cache that doubled as a coordinator

The cache that doubled as a coordinator

The rendering engine is what visitors see. The data layer feeds it, and keeping it stable under load was the less glamorous half of the build. This is the second post in the ON Labs series. The first covered the WebGL engine: shaders, draw calls, the GPU-level stuff. This one is about what happens...

Engineering
29d ago
The testbed nobody will see

The testbed nobody will see

Every case study was a standalone Astro page with its own layout, its own component imports and its own way of breaking on mobile. Twenty-two of them. Each one built at a different time by a different combination of people, with whatever patterns felt right that week. Changing shared behavior (a...

Engineering
1mo ago
Two months in Three.js, we started over

Two months in Three.js, we started over

Two months into a Three.js prototype, the transition we wanted still wasn't there. We could see it in our heads and not on the screen. That was the moment we started over from scratch. Labs uses real-time shaders, physics-style interactions and transitions that happen at the GPU level. That...

Engineering
1mo ago

The testbed nobody will see

Andy PurbrickAndy Purbrick Engineering
28 May 2026
3 min
The testbed nobody will see

Every case study was a standalone Astro page with its own layout, its own component imports and its own way of breaking on mobile.

Twenty-two of them. Each one built at a different time by a different combination of people, with whatever patterns felt right that week. Changing shared behavior (a hero transition, a spacing value, a navigation pattern) meant touching every file individually. The September 2025 release that started consolidating them changed around 200 files: roughly 13,000 insertions and 39,000 deletions, most of it duplicated layout code that no longer needed to exist.

We needed every case study to run through a single template and a shared set of modules. The migration took five months.

What lives in the testbed

We built a case study called testbed. It’s marked private: true and never appears on the public site. Its only purpose was to stress-test the template system before we touched real client work.

We loaded it with every module combination we could think of: heroes with video, text columns in every layout variant, cards with tight spacing, sliders, quotes, image-text blocks at different measures. If the template could handle the testbed, it could handle anything real.

The Testbed case study page: stacked black-and-white technical test patterns and circular targets used as module pressure tests, never visible publicly. The testbed: every module combination we could imagine, validated before touching real client work.

The testbed absorbed the risk that would otherwise land on a real client page. Rendering bugs surfaced in private, not in production.

The timeline

September 2025: The first release introduced unified blocks: accordion, floating nav, slider. Around 200 files changed in a single PR.

November 2025: CaseStudyTemplate.astro went live. We migrated Air first as a proof of concept, then activated Token, Hayah, Atelier100, London Design Festival, London Design Biennale and Bhutan in a batch.

Late November 2025: The testbed launched. Every edge case we could imagine, validated against the real template.

January 2026: The remaining 16 case studies were rebuilt using the module system. Migration complete. Twenty of the 22 now run through the unified template. None fall back to the legacy rendering path.

A case study today

An .mdx file with frontmatter and container directives. Media is referenced by short asset IDs that the rendering layer resolves to optimized images or video. The Air case study has 30 directive blocks (hero, text columns, cards, sliders, quotes) and the entire page is just markdown and asset references.

Split view: the air.mdx source file open in VS Code on the left, the rendered Air.inc case study page on the right. Directives and asset IDs on the left. The rendered page on the right.

The template reads the MDX, maps each directive to its module component and outputs the page. Next-project navigation is randomized — a small UX detail that means a repeat visitor never hits the same suggestion twice.

The work that paid for itself

The testbed. Building something nobody will ever see felt like wasted effort at the time. Five months later, it had earned its place: every bug it caught in private was a bug that didn’t ship to a client’s page. We still add module combinations to it whenever we build something new.

June 2026

William Badcock, A Touch-stone for Gold and Silver Wares (1677)

Hallmark

The word hallmark comes from an actual hall, Goldsmiths’ Hall in London, where since 1300 silver has been tested against the sterling standard and struck with the hall’s mark, so you could trust it without knowing the maker.

May 2026

Alan Kay: His Sketches, Piano, and Computer

Notes

A note can be a written record, a struck key, or the act of noticing, and each sharpens how we understand the world. A piano is an instrument, but also a technology built on the notes it makes possible.

April 2026

Photographs of a red cloth bound travel handbook from 1894. The book is open to show pages with maps and illustrations.

Change

A red cloth spine caught my eye in a Tokyo bookshop last week. A handbook for travellers in Japan, fourth edition, 1894. I was 132 years late, yet most of what it describes still stands.

Mar 2026

Screenshots from the development process of the new ON release notes page

Taking the temperature

You walk into a room and you can feel it. Whether there is energy or not. We describe someone as warm. We talk about things cooling down. Temperature is something we sense before we have words for it.

Feb 2026

Pixelised image of a horse running

Rethinking video, prototyping faster, and encoding brand logic

In Japanese, the character for hand is 手. Joined with the character for craft, it becomes 手仕事 (teshigoto), or handwork.

Jan 2026

Illustration showing the laying of undersea Atlantic telegraph cables

Transmission

The first dispatch of a new year, and I’m thinking about transmission: the message, the vessel that carries it, and what happens when they finally meet their destination.

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