You will get one diagnosed and fixed Python, Node.js, or React bug
Project details
I will diagnose and fix one reproducible bug in an existing Python, Node.js, or React codebase. You will receive a clear root-cause explanation, a focused code change, verification against the agreed reproduction steps, and concise handoff notes.
This service is a strong fit for crashes, broken API calls, incorrect data handling, build or runtime errors, failing UI logic, and small regressions. The client supplies the source code, setup instructions, expected behavior, and any required accounts or API keys. External service fees are not included.
One order covers one clearly scoped defect. New features, architectural rewrites, security testing, and unrelated defects require a separate quote. If the bug cannot be reproduced with the supplied materials, I will deliver the diagnosis and evidence gathered rather than guessing at a change.
This service is a strong fit for crashes, broken API calls, incorrect data handling, build or runtime errors, failing UI logic, and small regressions. The client supplies the source code, setup instructions, expected behavior, and any required accounts or API keys. External service fees are not included.
One order covers one clearly scoped defect. New features, architectural rewrites, security testing, and unrelated defects require a separate quote. If the bug cannot be reproduced with the supplied materials, I will deliver the diagnosis and evidence gathered rather than guessing at a change.
Programming Languages
JavaScript, Python, TypeScriptWhat's included
| Service Tiers |
Starter
$49
|
Standard
$99
|
Advanced
$199
|
|---|---|---|---|
| Delivery Time | 2 days | 3 days | 5 days |
Number of Revisions | 1 | 1 | 2 |
Bug Investigation | |||
Fix Documentation | |||
Detailed Code Comments | - | - |
Frequently asked questions
About Longwei
Agent Dev
Suzhou, China - 4:55 am local time
• AI agents with planning, tool use, memory, reflection, retries, and dynamic replanning
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• VLM-based GUI agents for application testing, workflow automation, and visual inspection
• LLM evaluation, benchmark design, failure analysis, and performance optimization
• Backend architecture, cloud migration, containerization, and high-throughput data processing
Steps for completing your project
After purchasing the project, send requirements so Longwei can start the project.
Delivery time starts when Longwei receives requirements from you.
Longwei works on your project following the steps below.
Revisions may occur after the delivery date.
Review and reproduce
Review the supplied reproduction steps, environment, expected behavior, and relevant code.
Isolate the root cause
Reproduce the defect and identify the smallest responsible code path.