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Per aspera ad astra
Per aspera ad astra




@jappix @crisp-im @enrich-data @makers-for-life @prose-im @crisp-oss @saasmakers @mirage-ai-com
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πŸ‘‹ 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.

πŸ”’ All of my work gets signed with my πŸ”‘GPG key. Use it to verify the authenticity of anything I publish.


  1. makers-for-life/makair makers-for-life/makair Public

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

    807 78

  2. crisp-oss/chappe crisp-oss/chappe Public

    πŸ§‘β€πŸ’» Developer Docs builder. Write guides in Markdown and references in API Blueprint. Comes with a built-in search engine.

    JavaScript 201 31

  3. sonic sonic Public

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

    Rust 19.6k 554

  4. vigil vigil Public

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

    Rust 1.7k 122

  5. bloom bloom Public

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

    Rust 708 47

  6. node-sales-tax node-sales-tax Public

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

    JavaScript 294 45