Leonardo José Sánchez

Leonardo José Sánchez  new_releases

About

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Backend Developer
Antioquia, Colombia
Contact Leonardo regarding: 
Flexible work

Timeline

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Résumé

Jobs verified_user 0% verified
  • NIVELICS
    Backend Developer public Remote experience
    NIVELICS
    Aug 2025 - Current (1 year 3 months)
    • Developing scalable backends with Wagtail 7.1, Django REST Framework, and MySQL for
    multi-frontend applications.
    • Implementing CI/CD pipelines via GitHub Actions, ensuring automated and reliable
    deployments.
    • Applying TDD, clean code principles, and agile methodologies to maintain high code quality
    and delivery speed
  • Voiceflip
    Senior Backend Developer public Remote experience
    Voiceflip
    Apr 2025 - Jul 2025 (4 months)
    Led development of a real-time multi-tenant voice assistant using Twilio Media Streams,
    OpenAI Realtime API, and ElevenLabs TTS.
    • Built async WebSocket consumers with Django Channels for high-performance audio
    streaming and processing.
    • Developed Agentic RAG systems orchestrated with LangChain and LangGraph, enabling
    context-aware retrieval, reasoning, and dynamic TTS responses.
    • Implemented barge-in detection, silence thresholds, and session-based customization per
    organization.
    • Designed Azure Function-based monitoring with Microsoft Graph alerts for system recovery.
    • Improved streaming performance by 30% through async architecture and modular design using
    SOLID principles.
  • C
    Backend Developer
    Cordova Solutions
    Sep 2024 - Feb 2025 (6 months)
    • Led system migrations with 99% data accuracy through robust validation pipelines.
    • Optimized PostgreSQL and Redis queries, reducing response times by 40%.
    • Integrated Hugging Face NLP models with LangChain workflows, boosting text analysis
    efficiency by 50%.
    • Automated deployments via Jenkins and GitHub Actions, cutting release failures by 30%.
    • Reduced infrastructure costs by 20% through Kubernetes resource optimization.
  • Cumbia Software
    Backend Developer public Remote experience
    Cumbia Software
    Apr 2023 - Sep 2024 (1 year 6 months)
    Designed high-performance APIs with Django, FastAPI, and Ruby on Rails, improving request handling by 35%.

    Built ML pipelines using Hugging Face and LangChain, reducing processing time by 25%.

    Streamlined AWS infrastructure (Lambda, S3, RDS), lowering latency by 30%.

    Implemented CI/CD automation, accelerating deployment frequency by 40%.
  • P
    Python Backend Developer
    Sep 2021 - Sep 2023 (2 years 1 month)
    • Built secure APIs with FastAPI, reducing security vulnerabilities by 60%.
    • Automated inventory management, cutting operational errors by 20%.
    • Integrated AI text classification using Hugging Face embeddings, improving accuracy by
    35%.
    • Implemented SQL tuning, boosting data retrieval speed by 45%.
  • SERVICIO NACIONAL DE APRENDI
    SENA
    SERVICIO NACIONAL DE APRENDI
    Aug 2016 - Apr 2018 (1 year 9 months)
    Trained 200+ junior developers in Python, Ruby, and API development.

    Developed scalable CRUD applications with Django and Ruby on Rails, improving database efficiency by 30%.

    Automated deployment workflows using Bash scripting, reducing manual workload by 50%.
Education verified_user 0% verified
  • Udemy
    DevOps-Las Artes Marciales del Software
    Udemy
    Apr 2020
  • UNIR - Universidad Internacional de La Rioja
    Maestría en Diseño y Gestión de Proyectos Tecnológicos
    UNIR - Universidad Internacional de La Rioja
    Mar 2017 - Mar 2019 (2 years 1 month)
  • Universidad cooperativa de Colombia
    Ingeniería de Sistemas
    Universidad cooperativa de Colombia
    Feb 2005 - May 2009 (4 years 4 months)