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👋 Hey! I am Valerian.

I am a Software Engineer and Product Designer. I spend my time building things.

What I am working on:

  • I am currently CTO at Crisp, a customer support SaaS, that I co-founded with Baptiste Jamin.
  • On the side, I am also working on Prose, a decentralized team messaging app, powered by XMPP.
  • I have a personal website, on which I sometimes blog, publish pictures and list books I have read.
  • I maintain popular OSS projects: Sonic (search index), Vigil (status page), Sales Tax (VAT calculator), and more.
  • Oh, and one last thing: I co-invented MakAir, the world's first open-source medical ventilator.

What I am interested in:

  • My domains of expertise are: messaging, protocols, cryptography, the XMPP standard, Rust programming, JavaScript full-stack development, application design, distributed systems, microservices and fault-tolerant architectures.
  • On my spare time, I also like to learn about: economics, 3D printing and CAD modeling.

🔒 All of my work gets signed with my 🔑GPG key. Use it to verify the authenticity of anything I publish.


  1. 🫁 The world's first open-source ventilator tested on human patients. Mass-producible at a low cost (~2000€).

    776 79

  2. 🧑‍💻 Developer Docs builder. Write guides in Markdown and references in API Blueprint. Comes with a built-in search engine.

    JavaScript 126 12

  3. sonic Public

    🦔 Fast, lightweight & schema-less search backend. An alternative to Elasticsearch that runs on a few MBs of RAM.

    Rust 13.6k 465

  4. vigil Public

    🚦 Microservices Status Page. Monitors a distributed infrastructure and sends alerts (Slack, SMS, etc.).

    Rust 1.2k 96

  5. bloom Public

    🌸 HTTP REST API caching middleware, to be used between load balancers and REST API workers.

    Rust 634 37

  6. 💰 International sales tax calculator for Node (offline, but provides optional online VAT number fraud check). Tax rates are kept up-to-date.

    JavaScript 237 29

1,855 contributions in the last year

Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Mon Wed Fri

Contribution activity

August 2022

Reviewed 2 pull requests in 1 repository
1 contribution in private repositories Aug 12

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