You will get optimized SQL queries and a database performance report
Project details
Slow SQL queries can delay reports, overload databases, and create problems across applications and ETL workflows. I will analyze and optimize your SQL queries to improve performance without changing the expected business logic or results.
Depending on the selected package, I will review the query structure, execution plan, joins, filters, aggregations, indexes, and relevant schema details. I will then refactor the SQL, recommend indexes or structural improvements where appropriate, and validate the output against the original result.
You will receive:
• Optimized SQL query or queries
• Explanation of the main bottlenecks
• Index and performance recommendations
• Validation of the expected output
• A concise technical report
I work with MySQL, Microsoft SQL Server, PostgreSQL, and Oracle. Anonymized schemas, sample data, and execution plans are accepted.
This project is ideal for slow reports, heavy analytical queries, recurring ETL processes, and database workloads that no longer scale efficiently.
Depending on the selected package, I will review the query structure, execution plan, joins, filters, aggregations, indexes, and relevant schema details. I will then refactor the SQL, recommend indexes or structural improvements where appropriate, and validate the output against the original result.
You will receive:
• Optimized SQL query or queries
• Explanation of the main bottlenecks
• Index and performance recommendations
• Validation of the expected output
• A concise technical report
I work with MySQL, Microsoft SQL Server, PostgreSQL, and Oracle. Anonymized schemas, sample data, and execution plans are accepted.
This project is ideal for slow reports, heavy analytical queries, recurring ETL processes, and database workloads that no longer scale efficiently.
Database Type
MySQL, Oracle, SQLite, PostgreSQLWhat's included
| Service Tiers |
Starter
$125
|
Standard
$295
|
Advanced
$595
|
|---|---|---|---|
| Delivery Time | 2 days | 4 days | 7 days |
Number of Revisions | 1 | 1 | 2 |
Schema Diagram | - | - | - |
Permissions Setup | - | - | - |
Import/Export Data | - | - | - |
Admin Panel Setup | - | - | - |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$75 - $200
Additional SQL query
(+ 1 Day)
+$90Frequently asked questions
About German
Senior Data Engineer | SQL & ETL Performance Expert
Madrid, Spain - 3:19 pm local time
I help companies diagnose and solve data performance, integration, and reporting problems from a single slow query to complete data pipelines and analytical models.
I am a Senior Data Engineer with 7+ years of experience working with complex data environments, financial information, large datasets, and business-critical reporting systems.
I can help you with:
• SQL query and database performance optimization
• ETL/ELT pipeline development and troubleshooting
• Data integration from databases, APIs, files, SharePoint, and external platforms
• Power BI, DAX, Power Query, and semantic data modeling
• Python automation, data processing, and validation
• Data quality, reconciliation, and reporting accuracy
• MySQL, SQL Server, Azure SQL, Oracle, Snowflake, and SSAS Tabular
My focus is not only writing code that works. I build solutions that are maintainable, documented, accurate, and ready for production.
Typical projects include:
• Fixing SQL queries or ETL processes that take too long
• Investigating incorrect metrics or duplicated data
• Building automated pipelines between multiple systems
• Optimizing Power BI datasets, DAX measures, and data models
• Replacing manual reporting processes with reliable automation
• Designing data structures that support analytics and AI use cases
Send me your query, pipeline description, error message, or current reporting problem. I will review the situation and explain the most practical way to solve it.
Steps for completing your project
After purchasing the project, send requirements so German can start the project.
Delivery time starts when German receives requirements from you.
German works on your project following the steps below.
Revisions may occur after the delivery date.
Review and diagnose
I review the query, schema, indexes, and available execution information to identify the main bottlenecks.
Optimize and validate
I refactor the SQL logic, recommend indexes where appropriate, and verify that the expected results remain unchanged.