You will get professional React or Next.js bug fixes and improvements
Project details
I will diagnose and fix bugs in an existing React or Next.js application using JavaScript or TypeScript.
I can help with runtime errors, broken user flows, responsive UI issues, API and authentication problems, state-management defects, performance problems, build failures, and integration errors.
The work begins with reproducing the issue and identifying its root cause. I then implement a focused, maintainable fix and verify the affected flow to reduce the risk of regression.
Each package covers a defined number of related issues. Bugs with separate root causes, major architectural changes, feature development, or extensive legacy-code refactoring may require an additional milestone or custom offer.
You will receive the completed source-code changes, a brief explanation of the cause and solution, and clear instructions for any required deployment or configuration steps.
I can help with runtime errors, broken user flows, responsive UI issues, API and authentication problems, state-management defects, performance problems, build failures, and integration errors.
The work begins with reproducing the issue and identifying its root cause. I then implement a focused, maintainable fix and verify the affected flow to reduce the risk of regression.
Each package covers a defined number of related issues. Bugs with separate root causes, major architectural changes, feature development, or extensive legacy-code refactoring may require an additional milestone or custom offer.
You will receive the completed source-code changes, a brief explanation of the cause and solution, and clear instructions for any required deployment or configuration steps.
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, DesignWhat's included
| Service Tiers |
Starter
$99
|
Standard
$249
|
Advanced
$499
|
|---|---|---|---|
| Delivery Time | 2 days | 4 days | 6 days |
Number of Revisions | 1 | 2 | 3 |
Number of Pages | 1 | 3 | 5 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
Optional add-ons
You can add these on the next page.
Additional Revision
+$30
Additional Page
(+ 1 Day)
+$75Frequently asked questions
About Alexandr
Senior React & Next.js Engineer | SaaS, Dashboards & TypeScript
Prague, Czech Republic - 1:21 am local time
With 7+ years of software engineering experience, I can take ownership of the full development lifecycle—from clarifying requirements and designing the architecture to implementation, testing, deployment, and production support.
I can help you with:
• React and Next.js application development
• Node.js, NestJS, and Express backend services
• Full-stack SaaS products, dashboards, and internal tools
• REST API development and third-party integrations
• Authentication, permissions, payments, and real-time features
• Debugging, refactoring, and modernization of existing applications
• Performance optimization and production issue resolution
• Docker, CI/CD, and deployment workflows
My core stack includes React, Next.js, TypeScript, Node.js, NestJS, PostgreSQL, MongoDB, Redis, Docker, GitHub Actions, and GitLab CI/CD.
I focus on maintainable solutions, clear communication, and practical engineering decisions appropriate for your product’s current stage. I am comfortable joining an existing codebase or building a new application from the ground up.
I am based in Prague and available for both short-term assignments and long-term product development.
Steps for completing your project
After purchasing the project, send requirements so Alexandr can start the project.
Delivery time starts when Alexandr receives requirements from you.
Alexandr works on your project following the steps below.
Revisions may occur after the delivery date.
Issue reproduction and diagnosis
I review the supplied materials, reproduce the issue, inspect the affected code and determine the likely root cause.
Scope confirmation
I confirm whether the issue fits the selected package and explain any additional work required before changing the code.