You will get a diagnosed and fixed bug in your web application
Project details
I will investigate and fix bugs in your web application, focusing on finding the root cause rather than applying a temporary workaround.
I can help with issues involving application logic, UI behavior, state management, responsive layouts, cross-browser compatibility, frontend/backend interactions, and other web application problems.
My process is simple: reproduce the issue, investigate the relevant code, implement a clean and focused fix, and test the affected functionality.
I have a strong background in computer science, mathematics, and software engineering, and I am comfortable working across different technologies and unfamiliar codebases.
Please provide a description of the issue, reproduction steps, access to the relevant source code, and instructions for running the project. Logs, error messages, or screenshots are also helpful.
This service is intended for specific bugs. Major feature development, redesigns, large-scale refactoring, or multiple unrelated issues may require a custom project.
If you're unsure which package fits your issue, please contact me before ordering.
I can help with issues involving application logic, UI behavior, state management, responsive layouts, cross-browser compatibility, frontend/backend interactions, and other web application problems.
My process is simple: reproduce the issue, investigate the relevant code, implement a clean and focused fix, and test the affected functionality.
I have a strong background in computer science, mathematics, and software engineering, and I am comfortable working across different technologies and unfamiliar codebases.
Please provide a description of the issue, reproduction steps, access to the relevant source code, and instructions for running the project. Logs, error messages, or screenshots are also helpful.
This service is intended for specific bugs. Major feature development, redesigns, large-scale refactoring, or multiple unrelated issues may require a custom project.
If you're unsure which package fits your issue, please contact me before ordering.
Programming Languages
JavaScript, Python, TypeScriptCoding Expertise
Cross Browser & Device CompatibilityWhat's included
| Service Tiers |
Starter
$50
|
Standard
$100
|
Advanced
$200
|
|---|---|---|---|
| Delivery Time | 2 days | 3 days | 5 days |
Number of Revisions | 1 | 2 | 2 |
Bug Investigation | |||
Fix Documentation | - | ||
Detailed Code Comments | - | - |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$25 - $60
Additional Revision
+$20
Fix Documentation
(+ 1 Day)
+$20
Detailed Code Comments
(+ 1 Day)
+$20Frequently asked questions
About Sergio
Software Engineer | Full-Stack Development & Technical Problem Solving
La Laguna, Spain - 6:05 pm local time
I can help with:
* Building web applications and new features
* Developing prototypes and MVPs
* Automation, scripts, and internal tools
* Debugging and fixing existing software
* Algorithms and technically challenging programming tasks
* Testing, refactoring, and improving code quality
* Understanding and extending unfamiliar codebases
I'm comfortable learning and working across different technologies rather than being tied to a single language or framework. My experience includes Python, TypeScript/JavaScript, Haskell, Rust, Rocq/Coq, and modern web technologies.
I hold an MSc in Computer Science and Bachelor's degrees in Mathematics and Computer Engineering. My academic background includes formal software verification and concurrent systems, giving me a particularly strong foundation in reasoning about complex software and correctness.
I enjoy projects where the problem isn't completely straightforward and requires understanding the requirements, designing a sensible solution, and delivering something that actually works.
Steps for completing your project
After purchasing the project, send requirements so Sergio can start the project.
Delivery time starts when Sergio receives requirements from you.
Sergio works on your project following the steps below.
Revisions may occur after the delivery date.
Reproduce & investigate
I’ll reproduce the reported issue and investigate the relevant code to identify its root cause.
Implement the fix
I’ll implement a clean, maintainable solution while keeping changes focused on the reported issue.