I'm Lucas Sifoni, an independent developer since 2015, based in Cahors, in southwest France. Since 2018 I've worked mostly with Elixir and the BEAM. In 2022, I created Alzo, a tool that takes hours of repetitive work off the hands of architecture firms and technical offices. Alzo is now developed by a dedicated company I co-founded in 2026.
Alongside this, I run
Turing-Express, a
small studio for custom software and consulting.
I'm also an amateur telescope builder and mirror maker. You'll find the content of this site shaped by both programming and precision optics.
Currently
Updated May 2026
- Building Alzo, and migrating isolated deploys to a BEAM cluster.
- Open to one new Elixir / BEAM engagement, see the hire page.
- Building the tiniest dobsonian telescope I know of : a 28mm f/4.
Selected works
Client work mostly stays private, but my journal might be the best way to see how I think both in systems and components. Feel free to explore both the elixir and astronomy tags to have a peek on the technical challenges I am interested in.
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Alzo
The company I co-founded. Alzo is a database, communication and publishing tool for architecture firms and technical offices, built to remove the repetitive overhead of running their projects. It is where most of my Elixir time goes today.
alzo.archi → -
An elixir telescope build log
An experimental project, presented at Code BEAM EU 2023. A terrestrial telescope I built to watch birds, trees and nearby things up close. It ran on Nerves on a RISC-V single-board computer, with Rust NIFs for the image work and a Phoenix LiveView interface, and could be driven from a phone or from a physical remote I wired and printed.
Read the series → -
Ovo2, a small language
A programming language designed and written from scratch in Elixir. Lexer, parser, interpreter, and a basic visual editor. It does only one thing: pure transformations of JSON-like data, without I/O, and looks like elixir, so it could be used as a kind of sandbox. I used it to talk through language design at ElixirConf EU 2024.
Read the series → -
Telescope mirrors
I grind telescope mirrors by hand to within tens of nanometers of the right curve, and build instruments around them. The most recent is a fully working 76/300 telescope that folds down small enough to fit in a jacket pocket. You will also find optics simulations, in rust and elixir, under the astronomy tag on the blog.
Read the write-up →
Get in touch
- Elixir / BEAM work : A fresh look at your codebase, prospective research, NIFs, Nerves, general consulting. Email me directly or see the "hire" page. contact@lucassifoni.info the hire page
- Custom software for small or mid-size businesses : If you need software shaped around how your business actually works, that is what my studio, Turing-Express, is for. turing-express.fr
- Architecture firms and technical offices : Alzo and its companion applications could likely be what you need. If you create tenders and find that generic AI tools confuse more than they help, Alzo takes a different approach. alzo.archi
Fresh articles from the blog
It now lives at /blog.
- 34 days in an Elixir tunnel to refactor my SaaS without a rewrite
- [Talk] Elixir-FR online Elixir meetup may 2026 - a modular monolith with hot code loading
- Table ronde optique amateur francophone 2026 - recap
- Table ronde optique amateur francophone 2026
- 2025 amateur optics / astronomy updates
- The tiniest yet real telescope I've built
- Guest post @ AppSignal – Debugging in Elixir with Observer
- Code Introspection in Elixir for safely firing one-off scripts
- Leveraging Elixir's hot code loading capabilities to modularize a monolithic app
- The best 3d printable 6"f5 (150/750) portable travel dobsonian telescope as of today