Juan Vargas
Software Engineer | CS @ PUC Chile
Experience
Freelance Software Engineer
2025 - Present
Building full-stack solutions for startups. Focus on AI automation, data integration, and web apps with LangChain and FastAPI.
Founding Engineer @ Blar.io
October 2024 - July 2025
Built blarify, an open-source tool transforming code into graphs for LLM processing using LSP and Tree Sitter. Implemented agent-based bug detection with LangGraph. Contributed to Microsoft's multilspy, adding Dart and PHP support. Built recommendation system using embeddings and clustering.
Frontend Leader @ MiTribu (Capstone Project)
March 2024 - July 2024
Led frontend development for a medical web app optimizing health information management for professionals. Coordinated a team of 4, delivering functional products each sprint with presentations every three weeks. Built a WhatsApp LLM chatbot trained in obstetrics to automate pregnancy-related questions.
Freelance Developer @ SignatureAPI
November 2023 - January 2024
Developed an MVP using C# and Raspberry Pi for secure hardware authentication, automating deployment via Bash scripts.
Projects
Teapot
March 2025 - Present
Built an optimization engine to maximize student PAES test scores based on target career and exercise history. Developed in collaboration with Filadd (YC S21) to test with students. Currently in production.
SortEm
Web game to sort numbers - 11,000+ matches played.
HairlessLifting
Strength training app with 193 exercises scraped via Puppeteer.
Other Highlights
- 2nd place at Platanus Hackathon - Math quiz generator (Quompy)
- CTF participant (UTFSM, UC) - cybersecurity challenges
- Music enthusiast - I play various instruments and love Brazilian music