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Jhonier Santana

Fullstack Software Developer

Jhonier Santana
Open to new opportunities

Jhonier Santana

Fullstack Software Developer

ReactReact NativeNode.jsTypeScript

2+ years of experience designing, developing and maintaining web, mobile and desktop applications, with a focus on UX/UI, scalable architecture, REST API integration and AI-assisted development with Claude Code.

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My experience

The teams and products I've worked on, from the latest to the first.

2 years and 3 monthsof professional experience

  1. May 2025 – Present · 1 year and 7 months

    Software Developer

    Seguridad Penta / Bartik, Bogotá, Colombia

    • Led UX/UI improvements across a suite of 5 web, mobile and desktop applications, optimizing key workflows.
    • Designed and implemented the frontend architecture of 4 SaaS applications, integrating REST APIs.
    • Directed the migration and update of critical dependencies and ran cross-platform functional testing.

  2. May 2024 – Oct 2024 · 6 months

    Frontend Developer

    Attendv / Betek, Medellín, Colombia

    • Built a complete on-demand services web application with React and Firebase.
    • Optimized app performance and SEO, improving load speed and search visibility.
    • Set up CI/CD pipelines, automating the team's deployment workflow.

  3. Sep 2023 – Oct 2023 · 2 months

    Software Developer (Freelance)

    Autonomic Mind, Medellín, Colombia

    • Built solutions across multiple languages (Dart, Kotlin, R, Lua) applying functional programming and recursion.
    • Used Git version control in a collaborative environment.

  4. Sep 2022 – Jul 2023 · 11 months

    Software Developer (Trainee)

    Holberton School, Bogotá, Colombia

    • Built full-stack projects with React, Python (Flask) and MySQL.
    • Applied unit and integration testing to ensure code quality and robustness.
    • Solved 100+ logic, algorithms and data structures exercises.

Technical skills

Frontend, Backend and databases

React.js, React Native, Electron.js, TypeScript, JavaScript (ES6+), HTML5, CSS3, SASS, Tailwind CSS, Chakra UI, Node.js, Python, Flask, Django, MySQL, REST APIs

State management, Testing and QA

  • Redux
  • TanStack Query
  • Functional testing
  • Unit testing
  • Bug documentation

Tools & methodologies

  • Git
  • GitHub
  • Scrum
  • CI/CD
  • Claude Code

Captain's log

What I've been building lately, straight from my GitHub.

  1. Commit in shift-experiences“Update package-lock.json, enhance DoorCard and ShiftDemo components, and improve SelectorPage functionality”
  2. Commit in shift-experiences“Merge pull request #2 from JhonierSantana/feat/rest-shif”
  3. Commit in Portafolio“Merge pull request #9 from JhonierSantana/feat/experience-scroll”
  4. Commit in Portafolio“Refactor achievements section and enhance localization content”
  5. Merged PR #1 in shift-experiences
See everything on GitHub →