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Deivi Campos

Software Developer · Backend · APIs · Enterprise Systems

Alajuela, Costa Rica

I build, maintain and improve software used in real-world operations, from enterprise systems and APIs to databases, integrations and web applications.

C#/.NET · Laravel · MySQL · REST APIs · Astro

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Open to remote opportunities

I am currently open to new employment opportunities.

You can contact me by email, LinkedIn, or the channels listed in this portfolio.

How I work

  1. Understand the problem and define the scope.
  2. Review the context and available information.
  3. Design a simple, maintainable solution.
  4. Implement clear, focused changes.
  5. Test the result and review potential impact.
  6. Document what matters and prepare the delivery or deployment.

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Selected projects

  • Institutional website for Fundación Bululo (2026)

    Institutional website developed from scratch, from content structure through responsive implementation and deployment.

    Astro and Tailwind CSS.

    View case study · View repository(opens in a new tab)

  • Confidential CRM for a credit company (2024)

    CRM for managing clients and following the credit process, including documents, permissions, automations, and reporting.

    Laravel, Livewire, Filament, and MySQL.

    View case study · View repository(opens in a new tab)

  • OpsFlow API

    API for internal commercial operations, built with ASP.NET Core and PostgreSQL, with automated tests, Docker, and CI.

    C#, .NET, ASP.NET Core, PostgreSQL, EF Core, Docker, CI, and xUnit.

    View case study · View repository(opens in a new tab)

  • SQL Performance Lab

    SQL lab in development for analyzing MySQL queries with EXPLAIN ANALYZE, indexes, synthetic data, and comparable measurements.

    MySQL, SQL, EXPLAIN ANALYZE, .NET, and C#. In development.

    View case study · View repository(opens in a new tab)

  • Data Migration & Reconciliation Toolkit

    A .NET desktop tool in development for migrating, validating, and reconciling data from CSV/XLSX files.

    C#, .NET, Windows Forms, CSV, XLSX, and xUnit. In development.

    View case study · View repository(opens in a new tab)

  • Incident Copilot

    An experimental .NET web application in development for analyzing synthetic technical incidents with LLM assistance and structured responses.

    C#, .NET, ASP.NET Core, LLM API, HttpClient, System.Text.Json, and xUnit. In development.

    View case study · View repository(opens in a new tab)

Technical notes

  1. MySQL query optimization: How to analyze a query, improve it, and check the result.
  2. Data migration and validation from Excel: How to prepare data and catch errors before importing it.
  3. Production incident resolution: How to diagnose a problem, fix it, and validate the affected flow.
  4. External API integration: How to validate data and handle failures when communicating with another system.

View all notes

Professional experience

MP Sistemas
February 2025 – August 2026. Development and support for a POS system using VB.NET, C#, MySQL, and SQL, plus Excel migration, Ministry of Finance APIs, and production incidents.
GuruXGlobal
May 2023 – November 2023. Web development and maintenance with PHP and JavaScript, including plugins, WordPress, Joomla, SQL, performance, and technical SEO.
AACROM
April 2022 – July 2022. Development of a web application and Kanban tool using JavaScript/jQuery, REST APIs, and SQL.

Links

  • GitHub(opens in a new tab)
  • LinkedIn(opens in a new tab)
  • CV(PDF, opens in a new tab)