boris.fyi

Website for a dental practice in Saint-Barthélemy, with shader-painted theme variants.

Your X following feed with a fader per account: see everything, only their best 10%, or nothing. x.com/borisfyi/status/2103597774172532861

Learning how LLMs work by building one from scratch, one small step at a time: bigram counts on names, the same bigram learned with a hand-written autograd, an MLP with wider context, then self-attention on Tiny Shakespeare, a BPE tokenizer and scaling up. Each step comes with a page that visualizes it.

Could a kitchen scale scan your plate and tell its exact macros? Research notes and an instrument design: first neutrons and NMR, now all-optical with Raman spectroscopy and a load cell.

Leverage AI as a proxy to meet people.

Infinite history exploration game for kids. AI generated scenes. Clicking anywhere and asking a question generates another scene.

Surfing the outbid.lol trend. Buy a chess team spot, pick the AI model that plays for you and write its prompt; models face off on a 3D board.

Surfing the outbid.lol trend. Bruno Simon's 3D driving portfolio (bruno-simon.com), reworked so buyers can preview and place their brand logo in it. Bruno didn't want to pursue the idea with us so we stopped in order not to make it look as if we stole his portfolio (despite it being MIT licensed).

Turns a script into a 15–30s vertical video with Remotion, where cut-out images pop in as animated stickers.

My harness for Vercel's $1M Sandbox security challenge on HackerOne.

MAXX, a local AI facialist. AI generates beard and hair looks.

Can Claude reproduce an image by drawing it in SVG? A loop that renders each attempt, scores it against the target (pixel diff, SSIM) and feeds the score back.

Estate planning in France, made understandable: a knowledge base on inheritance law and life insurance, and a questionnaire app that walks someone through their situation.

My Claude Code setup: implementer, reviewer and evaluator agents, the workflow tying them together, and skills. Inspired by www.anthropic.com/engineering/harness-design-long-running-apps

AI agent on steroid thanks to an evolving knowledge base. Works on git repos in a Vercel Sandbox, with live diffs, file trees and cost tracking.

How do we make LLM-generated code provably do what we intended? Knowledge base and experiments.

Enforces deterministic rules and references skills to improve coding agents efficiency and reliability. X thread about it: x.com/borisfyi/status/2069773184367239631. Led to a call with x.com/felixarntz from Vercel. I like to think it inspired github.com/shadcn-ui/lint, but it's certainly not the case.

Teaching myself to refactor a messy codebase with AI without breaking it: lessons, demos and learning records. Uses Matt Pocock's teach skill: github.com/mattpocock/skills/tree/main/skills/productivity/teach

CLI that scans a React + TypeScript codebase for components that reimplement each other. Another attempt at improving coding agents efficiency and reliability.

3D squat strength simulator and optimizer, built with three.js.

Take-home technical tests for Orizons engineering candidates, starting with a ~4h frontend test.

A council of advisors as agent skills (Paul Graham, Naval, Elon Musk), distilled from their writing and podcasts.

Game jam entry: a 3D gym equipment showcase in Three.js.

Game jam entry: draw a sketch and CLIP guesses it, right in the browser.

Game jam entry: ARC Odyssey, a vanilla JS game plugged into the ARC API.

A blueprint to eradicate anxiety by combining clinical science, wellness practices and technology.

Scrapes car listings from leboncoin and plots them in a 3D dashboard.

A procedural 3D anemone coral grown with space colonization and a flow field, iterated toward a target photo.

SBS Companion: weight calculator and last-set tracker for Greg Nuckols' SBS Strength RTF program (Next.js, Convex, Clerk).

Agent skills for evidence-based training and nutrition, distilled from textbooks like Schoenfeld's.

Dashboard analysing 15 months of Hevy and MacroFactor lifting data: volume, intensity, progression.

Nonos: start a dog walk and your friends see you and your dog on the map. Your location is only shared while you walk.

B2B marketplace connecting companies with cleaning services: upload your contract, get quotes.

Directory and map of French medical laboratories, merged from several data sources.

Google Maps places scraper split into discovery and extraction workers, backed by PostgreSQL.

Nonos, a dog-walk location sharing app for friends (Expo / React Native).

LaTeX dossier for a French innovation tax credit (CII) accreditation, plus a resume.

Chart of DataFast's growth (MRR) over time, built from scraped tweets. x.com/borisfyi/status/1976402049245098457

Dashboard for EVA, Scienta Lab's disease-simulation platform: indications, mechanisms, omics, portfolio.

DataFast leaderboard prototype. x.com/borisfyi/status/1974539153619775725

GitHub App to measure developers activity and productivity. Yes the name is just random, we didn't have one and I wanted to start immediately.

Side-by-side comparison of VPS providers along with Vercel pricing, colour-coded by who does better. Goal was to try to see how close/far Vercel was from VPS pricing (yeah, the comparison is weird, but it is done all the time on X)

Warehouse tool for a parcel delivery company: containers per lane, then sort, check and load packages onto driver routes.

Concept for democratie.gouv.fr: follow French bills and amendments as threads, with highlights and comments.

AI chat that answers supplement and health questions by searching Examine.com's research database, as a tool call. One-evening proof of concept.

EVA front end for Scienta Lab, prototyped in v0: launch disease-model simulations by specialty.

Fork of the Tailwind CSS docs site.

Fork of Tailwind CSS.

Fork of three-shader-baker: bake Three.js shaders and materials into textures.

Fork of react-three-csg: constructive solid geometry for React Three Fiber.

Fork of three.js.

Weekly Hevy workout exports and scripts that crunch them into training stats.

RAG experiment with LlamaIndex over hypertrophy and diet books.

Dofus bot that records and replays clicks, reading the screen with OCR. I'm not proud of that but I played with my brother to have fun just like when we were kids. Except I'm really not spending hours of my life mindlessly clicking around a screen.

Meet the Hacker News community in your city (meet.hn). ~2,250 users across ~960 cities in ~100 countries

Loads any site passed as ?url= in a full-page iframe, a clickjacking demo. A friend got hit with that, so I made a reproducible demo and shared it on X. x.com/borisfyi/status/1808443058469413137

Fork of GitLens for VS Code.

PixiBaby: create photo albums of your baby and send them.

Turns Notion pages into React Server Components, to use Notion as a CMS for a Next.js blog.

Game: guess which celebrities were blended together into one character.

Fork of xSuite: init, build, test and deploy MultiversX smart contracts.

Antonio's closet: showcase site for luxury jewelry, bags, clothes and a concierge service.

Fork of PrivateGPT: chat with your documents privately on local models.

Web push notifications test in Next.js.

This site: personal website, with tweet threads rendered as articles.

Opens several links at once from one page; also deployed on IPFS.

Website for id9v conseil, a real estate agent specialised in new-build property.

Chat UI mockup for an AI psychoanalyst that analyses your dreams.

0m.studio's website, currently just the wordmark.

Solver for the Kuboble puzzle game, using breadth-first search.

Fork of React.

Flash loan smart contracts on Elrond (now MultiversX), written in Rust.

Aztec Protocol take-home: rebuild a Merkle tree hash path server.

Shows whether it will rain in the next hour in the cities you pick.

Experiment using React as a template engine for JSX.

Tailwind CSS starter served with live-server.

Goggins Way: React app on AWS Amplify with Google sign-in and a GraphQL API, early stage.

Crypto tracker

Scripts reading token balances and auto-CAKE vaults on BNB Chain with web3.js.

NFT art site proof of concept on a Bootstrap blog template.

Dentist practice website, rebuilt in React + Tailwind.

Dentist practice website, Next.js version deployed from /docs.

Dentist practice website in plain HTML and Tailwind: header, nav and services.

Trying fp-ts in a React app that shows a grid of crypto coins.

Label Studio frontend customised for image annotation with labelled points.

Joko take-home: molecular formula parser API with a React frontend.

Docker setup for the Joko take-home (molecular parser).

Browser extension that marks tracked emails in the inbox, for my Haskell email tracker.

Dev setup and docs for IPOL (Image Processing On Line) demo apps, in Docker.

Docker image for building LaTeX documents (used for IPOL's docs).

Email open tracker server written in Haskell.

Fork of Monocle, an optics library for Scala.

Docker dev environment for working on Monocle.

Live counter for the 2020 lockdown: time elapsed, percentage and comparisons.

Exercises from FutureLearn's Haskell course: Starman and a spelling book.

Habit tracker dashboard built on Notion data.

Tic-tac-toe in Haskell, written while learning the language.

My GitHub profile README.

Chess CLI game in Haskell, with FEN support.

Airflow in Docker, profiling Python functions with py-spy.

Exercises from Learn You a Haskell, plus a Higher Lower game.

Feeding ML monitoring data into Elasticsearch and viewing it in Kibana.

Copy of Stanford's CS43 functional programming course site.

Sketch of an ML pipeline using Minotor's extraction, training and serving steps.

Scraping challenge: a Flask site of 1,000 fake posts to crawl, with a hash to submit as proof.

ML monitoring MVP: Grafana on Postgres, tested with the iris dataset.

Insta Prospects Finder: sells lists of Instagram prospects, with payments.

My final-year internship report in LaTeX, about Minotor.

Django REST monitoring API

Minotor: open-source monitoring for ML models in production (drift, bias, performance drops).

Scrapes the public emails of a repo's stargazers into a CSV.

SB Admin 2 Bootstrap template, saved for a mock Datarmada monitoring dashboard.

First-year ESIEE Java project: Zuul, a text adventure game.

Google Hash Code 2019 entry: the photo slideshow problem.

Google Hash Code 2018 qualification entry: self-driving rides.

Datarmada API that uploads models and logs their predictions.

Datarmada's Python package to deploy ML pipelines to production without the ops work.

Richelieu challenges: scraping and directory-listing exercises with their solutions.

Website of Datarmada, building open-source tools to manage AI in production.

Personal site in React with Framer Motion animations.

Neural network course project: MNIST digit recognition from scratch.

LaTeX essay on AI ethics: stakes, explainability, impartiality.

Course lab work for DSIA-5201A (TP1).

Draw a digit on a canvas and get the ML model's prediction (course project).

Django API serving the ML model's predictions for the canvas frontend.

Empty; a planned machine learning from scratch project.

Script watching for available appointments

Deep learning course material (TPs) by Franck Deturche, saved for later.

LaTeX technical writing assignment explaining ML concepts, k-means and linear regression.

Django bots project, starting with a TGV Max availability test.

Interactive chess game in Scala with move validation and check detection.

Exercises from Coursera's Functional Programming Principles in Scala.

LaTeX internship report from Lemon Learning.

Lemon Learning internship: an XGBoost model that finds the same page element after a front-end update.

Research notebooks and stats from my Lemon Learning internship.

Coconut LMS backend: Laravel GraphQL API for trainings, modules, chapters and sections.

Quick script to download manga chapters from JapScan.

Coconut LMS frontend in React, with a Draft.js course editor.

Learning Laravel with Docker: a small todo app.

Jekyll blog, with posts like "What I learned as a Kooala co-founder".

Facebook Hackathon Paris 2019: charts and metrics about a Messenger conversation, built in 24h.

Django app started at the 2019 Facebook hackathon, around fake news.

Course Kaggle competition: orienting indebtedness cases for the CRESUS association.

Ansible and Vagrant setup deploying apps behind HAProxy.

My Kaggle work: Titanic and indebtedness case orientation.

Collection of PDFs on data science, ML, software engineering and interviews.

Solutions to Daily Coding Problem, HackerRank and LeetCode exercises, plus interviews.

Instagram bot running in Docker.

My resume, hosted on GitHub Pages.

Django website for caterers, with a contact form sent by email.

School lab notebook: text comparison with Levenshtein distance.

Data analysis course: labs and a project on breast cancer data (QDA, discriminant analysis).

Data engineering course: Scrapy, MongoDB, Redis and Elasticsearch.

Scrapy crawler for TripAdvisor attractions, reviews and users.

Not Tripadvisor: crawls TripAdvisor users and reviews into Elasticsearch, with search and graph pages.

My first R project: Pokémon data visualisation with ggplot2 and Shiny.

Earlier version of my Pokémon data visualisation in R.

Django website for a real estate agency in Toulouse.

My resume as a React app.

Template to start a React and Sass project with webpack.

Instagram bot built on InstaPy: follow, then unfollow later.

School project on the A* pathfinding algorithm, with a report.

HTML templates for Kooala, a site where a local travel agent designs your trip.

Kooala: travel site where local agents plan your trip. Live 8 months (Oct 2018–Jun 2019): 132 users incl. 58 agents, 22 trip requests, 6 paid quotes (€266).

Operating systems course exercises in C.

My config files: zsh, vim and Atom LaTeX snippets.

Bio Santé Solutions: Django online shop for a health products company.

HTML templates for the Bio Santé Solutions online shop.

Starter template for HTML, LESS, Bootstrap and jQuery projects.

Django website for Hugo Boulenger Production: portfolio, videos, news and shop.

Python data project mapping the world's billionaires with Basemap.

Python matrix class for a school maths project.