Juan Martos Cuevas
I’m Juan. I build the layers most people import — storage engines, search engines, LLM infrastructure, order books — and then the native apps that sit on top of them.
01 Lines of code
297,402
non-blank, across every public repo
02 Commits
1,979
on 66 different days
03 Public repositories
69
4 systems, 13 products
04 Test files
719
most components ship their own suite
Every commit since Jul 2025
Languages · share of lines
Each ecosystem is built the hard way: every component in its own repository, with its own tests and README, and a strict rule — no imports between them. Then a flagship wires them together into something that works. Hover a node to trace its contracts.
Database engine
A relational database, from the page up.
Ten database components, each built in isolation with a strict no-cross-imports rule — then wired into nanosql, a working embeddable SQL engine.
L1 Distribution & HA
L2 Query engine
L3 Transactions
L4 Storage & persistence
↳ Flagship
Search engine
A web search engine, from the crawler up.
Nine from-scratch pieces of search infrastructure assembled into a working search console over a real corpus — then scaled toward millions of pages.
L1 Ingestion
L2 Indexing
L3 Ranking & relevance
L4 Query serving
↳ Flagship
LLM infrastructure
The LLM stack, layer by layer.
Twenty components covering everything between raw documents and a working AI product — retrieval, inference, agents, fine-tuning, evaluation — plus the apps that orchestrate them.
L1 Data & input
L2 Representation & retrieval
L3 Inference & control
L4 Agents
L5 MLOps & quality
↳ Flagship
Trading infrastructure
A trading system, from the tick up.
From a WebSocket feed and an L2/L3 order book to signals, an event-driven backtester, a pre-trade risk gate and a live terminal.
L1 Market data
L2 Analytics
L3 Backtest & execution
L4 Risk & audit
↳ Flagship
iOS, macOS, Windows, the edge, a microcontroller. Scroll through 12 of them — the page takes on each app’s palette as it passes.
See exactly what your iPhone is talking to — a network monitor that runs entirely on the device.
Your second brain, on iPhone. Private. Local. Semantic.
Your private AI studio, 100% on your Mac.
A local-first finance dashboard: drop in your bank statements, read your money as charts.
A currency converter dressed as a Solari split-flap board.
Sounds that keep you company — a minimalist white-noise app.
A strength-training log for the gym floor — one Cloudflare Worker, signed in with a passkey.
1:30restClaude, Gemini and OpenAI plan usage at a glance, from the macOS menu bar.
AirPods battery in the Windows tray, read straight from Bluetooth advertisements.
AirPods Pro 3
The case card, redrawn from the app
A local society of LLM citizens who perceive, reason and trade under computational scarcity.
Drawn with the simulation’s own tileset
DIY plant monitoring: ESP32 sensor nodes, a free Supabase backend and Telegram alerts.
🌱 A plant is below its moisture threshold — time to water it.
Illustration of a Telegram alert
A vintage folding camera that unfolds from the Dynamic Island.
pull down from the island
Jul 2025
Convall, a cloud file converter in Flutter — "my very first app", with a video demo and a README explaining every file.
Feb 2026
TickerTape ships: a currency converter that flips like a Solari board. Version 2.0 is a full redesign.
Jun 2026
Jun 2026
The AI Core (22 repositories) and Quant (12) ecosystems, built one module per repository, each with its own tests and README.
Jul 2026
Strata and Beacon: twenty-two more repositories, built component by component, then nanosql and a search console that wire them into working products. Wond, local-llm-studio and the Enclave follow.
Aug 2026
TunnelVision is reviewed and rejected under Guideline 5.4 — nothing wrong with the app, only the account type — so it is published in full, under MIT. PlantPulse and MoneyWatcher ship the same month.
Sep 2026
GymBuddy: a PWA and a Telegram bot on a single Cloudflare Worker, inside the free plan, signed in with a passkey.
Nov 2026
PodDeck decodes Apple's undocumented Bluetooth proximity message to bring AirPods battery to Windows — 45 commits in a single day.
All 69 public projects, with their README, history and where they sit in their system. Press / to search.