You will get a fixed Next.js, Supabase, Stripe, or webhook backend issue
Project details
I will investigate and fix one clearly defined backend issue in an existing Next.js or TypeScript application.
This service is suitable for problems involving Supabase, PostgreSQL, Stripe, webhooks, API integrations, authentication, database state, Edge Functions, or backend build and runtime errors.
Typical tasks include fixing a broken API route, repairing webhook verification or idempotency, debugging a Supabase query or RLS policy, correcting inconsistent payment and database states, resolving a TypeScript backend error, or adding focused tests for an existing failure.
I will first reproduce the issue, identify the root cause, implement a bounded fix, verify the result, and provide concise handoff notes.
This service covers one defined issue or a small group of closely related issues. A complete SaaS build, major redesign, mobile application, large migration, or unlimited ongoing support requires a separate scope and quotation.
This service is suitable for problems involving Supabase, PostgreSQL, Stripe, webhooks, API integrations, authentication, database state, Edge Functions, or backend build and runtime errors.
Typical tasks include fixing a broken API route, repairing webhook verification or idempotency, debugging a Supabase query or RLS policy, correcting inconsistent payment and database states, resolving a TypeScript backend error, or adding focused tests for an existing failure.
I will first reproduce the issue, identify the root cause, implement a bounded fix, verify the result, and provide concise handoff notes.
This service covers one defined issue or a small group of closely related issues. A complete SaaS build, major redesign, mobile application, large migration, or unlimited ongoing support requires a separate scope and quotation.
Programming Languages
JavaScript, TypeScriptCoding Expertise
SecurityWhat's included
| Service Tiers |
Starter
$49
|
Standard
$99
|
Advanced
$179
|
|---|---|---|---|
| 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.
Additional Revision
+$15Frequently asked questions
About Ke
Next.js & Supabase Backend Developer | Stripe & API Integrations
Chinahecun, China - 4:57 am local time
My current public implementation work includes:
• Secure webhook signature verification using raw request bodies, replay-window protection, and constant-time comparison
• Idempotent Stripe payment success and failure handling
• Supabase/PostgreSQL migrations and atomic state transitions
• Next.js and TypeScript API integration
• Automated tests, type checking, production builds, and GitHub Actions CI
• Investigation and repair of existing software projects
I am best suited for bounded backend tasks such as:
• Fixing a broken webhook or API integration
• Connecting Stripe payments to Supabase
• Repairing inconsistent database states
• Adding tests and CI to an existing project
• Debugging an inherited Next.js application
• Building a small backend integration with written acceptance criteria
My portfolio examples are public technical implementation proofs. I do not present them as confidential client deployments.
For each project, I first confirm the expected behavior, failure cases, acceptance criteria, and delivery scope. I then provide a focused implementation, tests, and a concise handoff document.
Steps for completing your project
After purchasing the project, send requirements so Ke can start the project.
Delivery time starts when Ke receives requirements from you.
Ke works on your project following the steps below.
Revisions may occur after the delivery date.
Review and reproduce the issue
I review the requirements, relevant code, logs, setup instructions, and expected behavior. I reproduce the issue and confirm that it fits the selected package before making changes.
Implement the focused fix
I modify only the relevant backend components, preserve the existing project structure where possible, and add appropriate error handling, security checks, or state protection.