You will get I will fix database bugs, ORM issues, and performance problems
Project details
I’m a Senior Backend Engineer with 15+ years of experience fixing complex database and ORM issues in production systems.
If your application is suffering from NULL values, broken defaults, failing migrations, slow queries, or incorrect ORM behavior, I will identify the root cause and apply a clean, production-safe fix.
I specialize in debugging and optimizing:
• SQLAlchemy, Django ORM, and ActiveRecord issues
• PostgreSQL and MySQL query errors
• Broken timestamps, defaults, and constraints
• Performance problems caused by inefficient queries
• Schema inconsistencies and migration issues
Every fix is tested to ensure data integrity and prevent regressions. You’ll receive a clear explanation of the issue, the solution, and optional recommendations to improve long-term stability.
If your application is suffering from NULL values, broken defaults, failing migrations, slow queries, or incorrect ORM behavior, I will identify the root cause and apply a clean, production-safe fix.
I specialize in debugging and optimizing:
• SQLAlchemy, Django ORM, and ActiveRecord issues
• PostgreSQL and MySQL query errors
• Broken timestamps, defaults, and constraints
• Performance problems caused by inefficient queries
• Schema inconsistencies and migration issues
Every fix is tested to ensure data integrity and prevent regressions. You’ll receive a clear explanation of the issue, the solution, and optional recommendations to improve long-term stability.
Database Type
MySQL, MS SQL, SQLite, PostgreSQL, MongoDBWhat's included
| Service Tiers |
Starter
$60
|
Standard
$150
|
Advanced
$350
|
|---|---|---|---|
| Delivery Time | 2 days | 4 days | 7 days |
Number of Revisions | 1 | 2 | 3 |
Number of Tables Added | 0 | 1 | 3 |
Schema Diagram | - | ||
Permissions Setup | - | - | |
Import/Export Data | - | - | |
Admin Panel Setup | - | - | - |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$40 - $120
Additional Revision
+$25
Additional Table Added
(+ 1 Day)
+$40
Schema Diagram
(+ 1 Day)
+$50Frequently asked questions
About Cosmel
Senior Backend Engineer | FastAPI, Django, Rails, Node | API Debugging
Tres Rios, Costa Rica - 9:15 pm local time
I specialize in Python (FastAPI, Django), Ruby on Rails, Node.js, PostgreSQL, and AWS, with deep expertise in API design, debugging, backend optimization, and serverless/cloud deployments.
Clients hire me to:
• Fix backend bugs, performance issues, failing endpoints, and 500 errors
• Diagnose and resolve API issues in FastAPI, Django, Rails, or Node
• Build secure, scalable REST and GraphQL APIs from scratch
• Improve database performance and eliminate bottlenecks (PostgreSQL, Redis)
• Modernize backend systems and migrate workloads to AWS (Lambda, API Gateway, S3, RDS)
• Develop automation, background workers, and distributed systems
• Add new backend features, integrations, and complex logic
Why technical teams trust me:
• I identify root causes quickly and fix them cleanly
• I understand real-world production systems and edge cases
• I write maintainable, well-tested code that survives scale
• I communicate clearly, give proactive updates, and deliver on time
• I reduce risk — no breaking changes, no surprises
Why Work With Me
• 15+ years experience across backend, APIs, architecture, and debugging
• Production-grade solutions, not “quick patches”
• Clear communication and expectations
• Strong ownership and delivery on deadlines
• Experience working with U.S. companies and distributed teams
• Ability to quickly understand existing systems and ship reliable results
Tech Stack
Python, FastAPI, Django, Node.js, TypeScript, Ruby on Rails
PostgreSQL, Redis
AWS Lambda, API Gateway, S3, RDS, CloudFront
REST, GraphQL, CI/CD, Docker
If you need a backend engineer who can take ownership, solve difficult problems, and deliver production-ready APIs and backend systems — let’s talk.
Steps for completing your project
After purchasing the project, send requirements so Cosmel can start the project.
Delivery time starts when Cosmel receives requirements from you.
Cosmel works on your project following the steps below.
Revisions may occur after the delivery date.
Analyze the database or ORM issue
I will review error logs, queries, models, migrations, and ORM configuration to fully understand the root cause of the issue.
Fix and optimize the database logic
I will apply a clean, production-safe fix to resolve incorrect queries, NULL values, broken defaults, performance issues, or ORM misconfiguration.