// freelance lead software engineer
Antoine Coulon
Lead Software Engineer · Freelance · Paris
I help teams ship resilient, scalable, evolvable software through full-stack engineering, craftsmanship and lean delivery. I also build open-source developer tools.
// open source
Open source & devtools
All-in-one devtool to analyze, search and visualize the dependency graph of your JavaScript / TypeScript / Node.js projects.
View on GitHub →A practical introduction to Effect and the rationale for adopting it in a TypeScript codebase.
View on GitHub →Zero-dependency library to build and traverse Directed Acyclic Graphs in JavaScript.
View on GitHub →Run NodeSecure's SAST/SCA security analysis automatically in your CI pipeline.
View on GitHub →// writing
From the blog
Errors as values: typed errors vs defects
Not every error belongs in your types. How to separate recoverable domain [...]
June 11, 2026 AIFaster with AI without burning out: Agentic Coding done right
Why AI exhausts so many dev teams, and how Agentic Coding done right lets you [...]
June 9, 2026 ConcurrencyFunction coloring: when sync and async become an implementation detail
The Function Coloring problem between sync and async functions, and how Effect [...]
March 17, 2026 ArchitecturePush notifications: a distributed system in its own right
From template to device: how mobile push notifications actually work, their [...]
January 15, 2026 AIAI is revolutionizing how we write software, not the engineer's role
AI is transforming how we write software, but not the engineer's mission [...]
January 12, 2026 AIThe underestimated advantage of AI
An AI agent aligns easily with a team's standards, but it amplifies the good [...]
December 22, 2025// speaking
Talks & podcasts
Structured Concurrency: the hidden power behind Effect
Effect Days Conference #2Uncovering Fibers: the hidden power behind the Effect library
Effect Paris meetup #3
Building skott: a journey of Effect-Driven Development
Effect Days Conference #1
Effect introduction, the whys
Paris TypeScript meetup #35