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marcoshernanz/README.md

Hi there, I'm Marcos

Software Engineer based in Madrid. I build privacy-first products and ML systems (Rust/Wasm, TypeScript, React/Next.js).

Current Status: Incoming Software Engineer Intern at Vercel (SF) - Summer 2026.

Focus

I enjoy two things:

  • Building end-to-end products (web + mobile)
  • ML systems (RAG, evals, local-first inference)

🏆 Competitive Programming

  • Codeforces: Max Rating 1800 (Expert). (Top ~5% globally).
  • Meta Hacker Cup: 3x Top 2,000 Global Rank (Round 2 Qualifier).
  • ICPC SWERC: 2x Regional Finalist (Southwestern Europe).
  • Spanish Olympiad in Informatics (OIE): National Finalist.
  • Madrid Regional Olympiad: 🥈 Silver Medalist.

🚀 Featured Projects

  • ChatVault: Privacy-first semantic search for WhatsApp. Runs a MiniLM/BERT model in-browser using Rust + Wasm.
  • Vexi: DX-first local-first RAG database (TypeScript client + Rust API).
  • rust-mlp: From-scratch MLP library for Rust (deterministic training, allocation-free inference).
  • CalYo: AI nutrition tracker (Expo + Convex).
  • MiniLift: Local-first workout tracker (React Native + MMKV).
  • Cogniba: N-Back brain training platform (2,000 users).

🛠 Tech Stack

TypeScript Rust WebAssembly Next.js React Native Convex Supabase C++

🌐 cogniba.com | Email Me | LinkedIn

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  1. ChatVault ChatVault Public

    Privacy-first semantic search engine for WhatsApp. Runs 100% in-browser using Rust, WebAssembly, and BERT. Zero data egress.

    TypeScript 18

  2. CalYo CalYo Public

    AI-powered nutrition tracker built with React Native, Expo, and Convex. Features computer vision food analysis and real-time sync.

    TypeScript 1 1

  3. cogniba/cogniba cogniba/cogniba Public

    Scientific brain training platform based on Dual N-Back. 2,000 registered users. Built with Next.js and Supabase.

    TypeScript 2 1

  4. MiniLift MiniLift Public

    Local-first, minimalist workout tracker built with React Native and MMKV. Zero latency, 100% offline.

    TypeScript 1