I will fix, optimize databases, or write complex sql queries

Miguel Villa

Colombia

I speak English, Spanish

Systems Engineer and Developer Backend

Hello! I am a Systems Engineer and Backend Developer specializing in Java, PHP, and SQL databases. I focus on backend bug fixing, writing optimized SQL queries, and creating automated JUnit 5 unit tes...
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About this Gig

Are you facing slow database queries, broken scripts, or tricky SQL bugs?

As a Systems Engineer and Backend Developer, I specialize in SQL optimization, query design, and backend debugging. I write, clean, optimize, and fix SQL scripts to ensure fast execution and data integrity.

What I Can Do for You:

  • Fix & Debug: Resolve syntax errors, failed JOINs, subqueries, and incorrect calculations.
  • Query Optimization: Speed up slow queries, optimize execution plans and indexes.
  • Complex Queries: CTEs, Window Functions, Views, and Aggregations.
  • Stored Procedures & Triggers: Create, modify, or debug them.
  • Schema Support: ERD assistance, table normalization, import/export scripts.

Supported Databases: MySQL/MariaDB, PostgreSQL, Microsoft SQL Server (T-SQL).

Why Choose Me?

  • Clean, tested, and fully commented SQL scripts.
  • Clear explanations and post-delivery support.
  • Realistic timelines, no rushed fixes.

Please contact me before ordering if you have custom requirements, so I can confirm scope and timing.

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Database type:

Relational database

Platform:

MySQL

•

PostgreSQL

•

SQL Server

Expertise:

Design

•

SQL

•

Performance

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