--- title: Interview With Matheus Moreira | daily.dev description: Matheus Moreira, a medical doctor and hobbyist programmer, built Lone Lisp — a Lisp interpreter written in freestanding C that runs directly on Linux system... canonical: https://daily.dev/posts/interview-with-matheus-moreira-x8izsmpts twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Interview With Matheus Moreira | daily.dev og:description: Matheus Moreira, a medical doctor and hobbyist programmer, built Lone Lisp — a Lisp interpreter written in freestanding C that runs directly on Linux system... og:url: https://daily.dev/posts/interview-with-matheus-moreira-x8izsmpts og:image: https://api.daily.dev/og/posts/X8IZSmpTS.png og:image:alt: Interview With Matheus Moreira og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Interview With Matheus Moreira **[Lobsters](https://daily.dev/sources/lobsters)** · 32 min read · 0 upvotes · 0 comments ## Summary Matheus Moreira, a medical doctor and hobbyist programmer, built Lone Lisp — a Lisp interpreter written in freestanding C that runs directly on Linux system calls with no libc dependency. The interview covers his programming journey from C++ as a teenager through Ruby, Scheme, and eventually C, his motivations for bypassing glibc entirely, and the technical details of Lone's design including its FEXPR-based evaluator, delimited continuations, Common Lisp-inspired restartable error system, mmap-based memory management, and ELF segment embedding for self-contained programs. He discusses performance tradeoffs (faster startup than Ruby, 10-100x slower than Python), plans for a JIT compiler, and his philosophical goal of inspiring developers to own their entire stack. He also shares how he uses Claude for code review and project management while writing all code himself. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Interview With Claude Roux](https://daily.dev/posts/interview-with-claude-roux-5dskwujf9) · Lobsters · 0 upvotes · 0 comments - [Abstract Heresies: Why vibe code in Lisp?](https://daily.dev/posts/abstract-heresies-why-vibe-code-in-lisp--o2rhku1pd) · Hacker News · 0 upvotes · 0 comments - [Ruby and Lisp — What Ruby Borrowed from Lisp’s Spirit](https://daily.dev/posts/ruby-and-lisp-what-ruby-borrowed-from-lisp-s-spirit-jxnfnpyms) · Ruby Flow · 0 upvotes · 0 comments - [Ruby And Its Neighbors: Lisp – Noel Rappin Writes Here](https://daily.dev/posts/ruby-and-its-neighbors-lisp-noel-rappin-writes-here-f4hwrudxb) · RUBYLAND · 0 upvotes · 0 comments --- Tags: [#linux](https://daily.dev/tags/linux), [#c](https://daily.dev/tags/c), [#lisp](https://daily.dev/tags/lisp) [View this post on daily.dev](https://daily.dev/posts/interview-with-matheus-moreira-x8izsmpts) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Interview With Matheus Moreira","url":"https://daily.dev/posts/interview-with-matheus-moreira-x8izsmpts","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/interview-with-matheus-moreira-x8izsmpts"},"datePublished":"2026-07-18T09:59:11.531Z","dateModified":"2026-07-18T09:59:34.109Z","description":"Matheus Moreira, a medical doctor and hobbyist programmer, built Lone Lisp — a Lisp interpreter written in freestanding C that runs directly on Linux system...","image":"https://media.daily.dev/image/upload/s--58gMhC4P--/f_auto/v1722860399/public/Placeholder%2012","thumbnailUrl":"https://media.daily.dev/image/upload/s--58gMhC4P--/f_auto/v1722860399/public/Placeholder%2012","isAccessibleForFree":true,"articleSection":"Lobsters","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Lobsters","logo":"https://media.daily.dev/image/upload/s--tl8v_Fku--/f_auto,t_logo/v1698841318/logos/lobste.jpg","url":"https://daily.dev/sources/lobsters"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/interview-with-matheus-moreira-x8izsmpts","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"linux,c,lisp","timeRequired":"PT32M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Lobsters","item":"https://daily.dev/sources/lobsters"},{"@type":"ListItem","position":3,"name":"Interview With Matheus Moreira"}]} ```