ML Engineer at MercadoLibre, adjunct professor and PhD student at Universidad Nacional de Colombia. Mechatronics engineer.

🌐 jhonfel.github.io

• 🤖 MercadoLibre
  • ML Engineer, Research & Acceleration team (current)
  • Data Engineer, cloud cost forecasting team
  • DS Engineer, OneClick team
• Senior NLP Engineer at Millenium BPO: chatbots and voicebots in production.
• Co-founder of SamiBot, a startup that built waiter robots.

• 🎓 Adjunct professor (profesor ocasional) at UNAL, teaching Introducción a los Sistemas Inteligentes. The course program, weekly lessons and workshops are at introsistemasinteligentes.com.
• Before that, during my Master's, taught the introductory programming course as a graduate instructor (profesor asistente).

• 📚 PhD student at UNAL, after finishing my Master's in Systems and Computing Engineering there.
• Comparison of Prediction Equations for Impulse Oscillometry: An AI-based Tool for Assisted Clinical Report. C. Zhang, J.F. Delgado Salazar, L.F. Guantiva Vargas, C.E. Rodriguez-Martinez, S.M. Restrepo Gualteros. Am J Respir Crit Care Med 211 (Suppl. 1), A3651. ATS 2025 International Conference.
• Awards at the Congreso Colombiano de Neumología Pediátrica:
  • 2026 · Best poster: normal acid–base values in children living at high altitude, and a visual application for their interpretation.
  • 2024 · Second place: prediction equations for impulse oscillometry.

• jhonfel.github.io: my personal site, an interactive workbench rendered with WebGPU.
• whisper-inference-bench: benchmark of Whisper on an RTX 5090. OpenAI's reference implementation vs the transformers recipe (about 2× faster on long audio), plus SageAttention 2 and 3 as transformers attention backends, with an encoder profile and all measured results.
• introsistemasinteligentes.com: course site for Intelligent Systems at UNAL.
• documentation-rag-poc: agentic RAG for answering questions over documentation.
• toxic-text-detection: NLP classifier for toxic text.

• jhonsnake/sunshine-hyprland-virtual-display · PR #4: per-client resolution and refresh-rate matching and end-to-end HDR10 streaming for an Apollo-style virtual display on Linux (Hyprland + Sunshine), including a Hyprland screencopy patch. The Sunshine side relies on LizardByte/Sunshine#5615.

• President of RAS – CEIMTUN at Universidad Nacional de Colombia (2018).

Python · machine learning & NLP · data engineering · Swift · JavaScript/React · Linux (Arch + Hyprland)

Happy to talk about ML, teaching, robotics or Linux setups.