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I will fix nextjs convex react supabase rls stripe drizzle orm multi tenant saas claude
Sandra K
About this gig
Your SaaS looks finisheduntil users can't log in, Stripe payments fail, or one tenant can access another's data. I fix the backend problems blocking your launch.
WHAT I FIX:
- Next.js bug fixes
- React app debugging
- Convex backend errors
- Supabase RLS policies
- Supabase Auth & OAuth
- Better Auth integration
- Drizzle ORM migrations
- PostgreSQL / Neon
- Multi-tenant SaaS
- RBAC & tenant isolation
- Stripe checkout
- Stripe subscriptions
- Stripe webhook failures
- API integration & fixes
- Claude Code audits
- AI-generated code cleanup
- Lovable / Bolt.new fixes
- Base44 / Replit repairs
- v0 / Cursor app fixes
- Vercel deployment
I troubleshoot existing SaaS MVPs and vibe-coded apps, securing databases, permissions and billing while preserving working features.
No blind rewrites: I trace root causes, test critical workflows, and document fixes. Stack: TypeScript, Next.js, React, Convex, Supabase, Drizzle, PostgreSQL, Stripe, Better Auth, Firebase and GitHub. I also fix broken sessions, JWT claims and access rules.
MESSAGE ME BEFORE ORDERING with your stack, error and desired result. I'll confirm the scope, recommend the right package and help get your app launch-ready.
Get to know Sandra K
Sandra K
Claude Code AI Automation Expert
- FromNigeria
- Member sinceJun 2026
- Avg. response time1 hour
- Last delivery2 months
Languages
English, Spanish, French, German
Hi, I'm Sandra. Stuck Claude Code setup, broken AI agent, or a vibe-coded app that crashes outside the demo? I find the root cause and build it right.
I specialize in Claude Code, Claude AI agents, Claude Cowork, Claude skills, Hermes agent, and MCP connectors, turning fragile builds into stable, multi-agent systems.
From vibe coding cleanup to AI automation and n8n, I connect your stack so it runs without babysitting.
I also build Polymarket and crypto trading bots, plus 3D animated luxury websites using Three.js, GSAP, WebGL, and Spline.
Whatever's broken, I ship a lasting fix.
FAQ
Can you fix my existing Next.js, React, or AI-built SaaS application?
Yes! I diagnose and repair existing Next.js, React, TypeScript, and SaaS applications, including broken APIs, authentication, database errors, and backend issues. I'll review your current setup and recommend the right package before starting.
Can you fix Supabase RLS policies and permission denied errors?
Absolutely! I troubleshoot Supabase RLS, PostgreSQL permissions, authentication errors, JWT claims, and database access issues. I can correct policies, review access controls, and test authorized and unauthorized requests.
Can you integrate Better Auth, OAuth, and role-based authentication?
Yes! I work with Better Auth, Supabase Auth, OAuth, sessions, protected routes, and RBAC. I can troubleshoot login/signup errors, Google authentication, user permissions, and organization-based access for Next.js SaaS applications.
Do you fix Convex backend, Drizzle ORM, and PostgreSQL database issues?
Yes! I troubleshoot Convex queries, mutations, authentication, and backend functions. I also handle Drizzle ORM schemas, SQL migrations, PostgreSQL, Neon, and Supabase database issues. I'll use the appropriate solution for your existing stack.
Can you fix Stripe payments, subscriptions, and webhook integration?
Yes! I troubleshoot Stripe Checkout, subscription billing, webhook failures, payment status updates, and API integration errors. I can also review billing-related backend logic. Message me with your Stripe issue so I can confirm the required scope.
Can you secure or repair my multi-tenant SaaS application?
Yes! I can troubleshoot tenant isolation, workspace permissions, RBAC, organization memberships, and database access controls. I test the agreed security workflows to identify improper access between users or organizations. A full security audit requires separate scoping.
Can you audit and repair apps built with Claude Code, Lovable, Bolt, or Replit?
Yes! I work on AI-generated applications built with Claude Code, Lovable, Bolt.new, Replit, Base44, and v0 by Vercel when the necessary code is accessible. I can investigate bugs, review backend security, refactor code, and resolve production blockers.
Can you fix API integrations, database migrations, and deployment errors?
Yes! I troubleshoot REST APIs, third-party integrations, Drizzle migrations, Convex functions, Supabase connections, and Vercel deployment errors. I can also help with environment configuration, server errors, and GitHub workflows within the agreed package scope.
Which Fiverr package should I choose for my SaaS project?
Basic covers one defined bug. Standard covers two related issues or an agreed backend workflow. Premium covers up to four related issues within two workflows. For larger SaaS builds, migrations, or security audits, contact me for a custom offer.
What do you need to start, and will my existing app remain intact?
Send your tech stack, error details, expected result, and relevant screenshots or logs. I work through controlled code changes and test agreed fixes before delivery. Backups and staging are recommended for production work. Please message me before ordering to confirm scope.
