Startups hire us for the hard parts: rich-text editors, real-time collaboration, AI-native features, and desktop-grade software running in the browser.
SuggestCat · AI in the editor
Axdraft · collaborative legal editor
Emergence/Engineering
Growth/Engineering→
Most teams can build a CRUD app. The parts below are where projects stall, and where a specialist team saves you months. We’ve shipped each of these into production, repeatedly.
The editor is the product in writing tools, docs, and AI apps: and it’s deceptively hard: every keystroke, paste, undo and copy has to behave perfectly. We build production editors on ProseMirror, TipTap and Lexical, and we maintain the open-source plugins the rest of the industry uses.
What it means: many people editing the same document at once, like Google Docs or Figma, with no conflicts and nothing lost, even when someone goes offline and comes back. How we do it: CRDTs and YJS, the hard sync math that merges everyone’s changes correctly instead of overwriting them.
What it means: heavy software that normally needs an install, a CAD tool, an editor, a design suite, running in a plain browser tab, nothing to download. How we do it: we compile C++ to WebAssembly and render it ourselves. We did exactly this with KiCad, a full PCB-design suite (see PCBJam below).
LLM features that actually ship, not demos: in-editor assistants, grammar and completion (our SuggestCat plugin), retrieval and summarization, wired into real products with the latency, streaming and UX that make them usable.
PCBJam is KiCad, a full professional PCB-design suite normally installed on your desktop, running entirely in the browser. No install, no plugin. We compiled KiCad’s C++ codebase to WebAssembly with Emscripten and wrote our own WebGL renderer for its graphics layer. It hit the front page of Hacker News.
Mostly US startups, mostly in editors, collaboration and AI. A few of them you may already use.
We developed key product features for their end-to-end encrypted collaboration platform. The result: acquisition by Notion.
An AI-powered conversational tutor giving learners instant feedback on speaking and pronunciation.
A specialised legal document editor for law firms, built for real-time team collaboration.
A collaborative text editor for writers and their editors.
A testing framework for a new Bluetooth product, ensuring production quality on the factory line.
A solution that helps firms organize their content for easier everyday use.
Startups and product teams whose product lives or dies on the editor, the collaboration, or getting something hard to run in the browser.
Start a project →When we can’t buy the tool we need, we ship it, and often open-source it.
A full PCB-design suite running entirely in the browser via WebAssembly. Featured on Hacker News.
An AI plugin for rich-text editors: grammar correction and text completion, built on ProseMirror.
A platform we built to help users track and coach their progress on their fitness journey.
Middleware that turns Stripe payments into compliant invoices automatically, with proactive error handling.
Small, senior, and used to ambiguous early-stage problems. We plug into your repo and your Slack and move like part of the team, not a distant agency.
Editors, collaboration and browser-native engineering are our home turf. You skip the ramp-up and the “let’s research this” months.
We build LLM features that survive real users, streaming, latency, guardrails, not just a nice demo.
Your repo, your CI, your standups. We transfer the know-how so the system is yours, documented, when we’re done.
A suite of ProseMirror plugins that teams around the world build their editors on. It’s also the fastest way to see how we write code, and why editor work is second nature to us.
prosemirror-suggestcat-pluginAdds AI features, grammar correction and text completion, to a ProseMirror editor.prosemirror-slash-menuThe “/” command menu, opened inline and searchable by keyboard. (React UI package too.)prosemirror-link-previewDiscord- and Slack-style link previews inside the editor.prosemirror-image-pluginFramework-agnostic image handling: upload, resize, placement.prosemirror-codemirror-blockCode blocks powered by the modern CodeMirror 6.prosemirror-link-pluginprosemirror-paste-linkRobust link detection, change-tracking and paste behaviour.If your product lives or dies on the editor, the collaboration, or getting something impossible to run in the browser, that’s exactly the conversation we like.
No sales pitch. Just an honest read on whether we’re the right team for your problem.