You will get AI-built MVP hardened for secure production use
Project details
Your MVP works in the demo.
Now it needs to work with real accounts, real data, expired tokens, duplicate webhooks, unexpected inputs, and users who do not know where the sharp edges are.
I will harden your AI-built or rapidly developed application without replacing everything that already works. We will agree on the highest-priority production risks before implementation, then I will repair those areas with maintainable code, validation, tests, and clear documentation.
This service is suited to applications built with combinations of Next.js, Node.js, TypeScript, PostgreSQL, Supabase, REST APIs, OpenAI, Claude, and similar technologies.
Typical improvements include:
• Authentication and session reliability
• Authorization and tenant data isolation
• Supabase RLS and safe database access
• API validation and secure server boundaries
• Integration retries and error handling
• Webhook idempotency
• Refactoring inconsistent AI-generated code
• Tests, logging, deployment, and CI checks
The scope is a focused hardening sprint, not an unlimited application rewrite.
Now it needs to work with real accounts, real data, expired tokens, duplicate webhooks, unexpected inputs, and users who do not know where the sharp edges are.
I will harden your AI-built or rapidly developed application without replacing everything that already works. We will agree on the highest-priority production risks before implementation, then I will repair those areas with maintainable code, validation, tests, and clear documentation.
This service is suited to applications built with combinations of Next.js, Node.js, TypeScript, PostgreSQL, Supabase, REST APIs, OpenAI, Claude, and similar technologies.
Typical improvements include:
• Authentication and session reliability
• Authorization and tenant data isolation
• Supabase RLS and safe database access
• API validation and secure server boundaries
• Integration retries and error handling
• Webhook idempotency
• Refactoring inconsistent AI-generated code
• Tests, logging, deployment, and CI checks
The scope is a focused hardening sprint, not an unlimited application rewrite.
Programming Languages
HTML & CSS, JavaScript, TypeScriptWhat's included
| Service Tiers |
Starter
$399
|
Standard
$949
|
Advanced
$1,499
|
|---|---|---|---|
| Delivery Time | 5 days | 10 days | 15 days |
Number of Revisions | 1 | 2 | 3 |
Design Customization | |||
Content Upload | |||
Responsive Design | |||
Source Code |
Optional add-ons
You can add these on the next page.
Additional backend issue or workflow
+$100
Additional API integration repair
+$100
Production monitoring setup
+$50Frequently asked questions
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DS
Diana S.
Aug 14, 2026
Test an Express.js Error Handling Library & Provide an Honest Developer Review
Aaron is a professional contractor. He carried out the task assigned to him thoroughly, carefully and honestly. His feedback was insightful and extremely helpful to me. I highly recommend such an outstanding contractor!
About Aaron
Full-Stack Developer | AI Integration & SaaS | Node.js, Next.js, LLM
Abuja, Nigeria - 10:06 pm local time
Are you building an AI-powered SaaS that works as a demo but isn’t ready for real users?
Is your SaaS or web application struggling with unreliable API integrations, weak authentication, security risks, or scalability issues?
Or do you need a Full Stack Developer who can take your SaaS MVP from idea to production without waiting for detailed instructions?
Most software problems aren’t feature problems.
They’re architecture problems.
And production readiness is everything.
Some developers simply build features.
As a Full Stack Developer, I help businesses build secure, scalable, production-ready SaaS and AI software that:
✅ combines modern frontend development, scalable backend architecture, databases, REST APIs, and AI integrations,
✅ turns early-stage prototypes, SaaS MVPs, and AI-generated code into reliable web applications and AI-powered SaaS products,
👉 so you can launch, onboard real customers, and grow without rebuilding everything later.
Whether you need a Full Stack Developer for a new SaaS MVP, an AI Full Stack Developer to add AI features to an existing product, help hardening an AI-built codebase, multi-tenant SaaS architecture, or AI automation inside a live SaaS platform —
my focus remains the same:
to build clean, maintainable SaaS systems that solve the real business problem, handle real-world failures, and remain reliable as your users and data grow.
As a Full Stack Developer, I commonly help with:
✅ Full Stack Web Application Development
✅ SaaS Development, SaaS Platforms & Multi-Tenant SaaS Architecture
✅ AI App Development, AI Agent Development & LLM Integration
✅ AI-Powered SaaS & AI Integration into Existing Products
✅ MVP Development & Prototype to Production
✅ Next.js, React & TypeScript Development
✅ Node.js, NestJS & Python Backend Development
✅ PostgreSQL, Supabase & Database Architecture
✅ REST API Development, API Integration & Third-Party Integrations
✅ OpenAI API, Anthropic Claude API, Tool Calling & Structured Outputs
✅ Authentication, Authorization, OAuth, RBAC & User Management
✅ Application Security, Secure API Boundaries & Data Isolation
✅ Stripe, Shopify, Flutterwave, Paystack & Payment Integrations
✅ Workflow Automation, Webhooks, Background Jobs & n8n
✅ Testing, Debugging, Performance Optimization & Error Handling
✅ Git, GitHub Actions, CI/CD, Docker & Cloud Deployment
✅ AWS, Google Cloud, Vercel, Railway & Cloudflare
✅ AI-Generated Code Review, Refactoring & Codebase Hardening
Many businesses already have a working SaaS product or AI prototype.
What they’re missing is a technical foundation that lets that product work securely and reliably for real customers.
That’s where I help as a Full Stack Developer.
As a Full Stack Developer, I work comfortably across frontend, backend, databases, APIs, cloud infrastructure, security, testing, and deployment. I can enter an unfamiliar SaaS codebase, identify what’s solid, uncover what’s risky, and prioritize what needs to be fixed first.
As a Full Stack Developer, I also use AI coding tools such as Claude Code, Cursor, Codex, and GitHub Copilot to accelerate research, architecture, Full Stack Development, debugging, testing, and documentation — without treating AI-generated code as automatically production-ready.
Clean code still matters.
Security still matters.
And SaaS software still needs to work when an access token expires, a webhook arrives twice, an API becomes rate-limited, or thousands of users begin using it.
Whether you need a Full Stack Developer for SaaS Development, an AI Full Stack Developer for AI App Development, a SaaS Developer for multi-tenant platforms, or help to:
🔹 build a scalable backend, launch a full-stack SaaS MVP, integrate OpenAI or Claude AI into your SaaS product, secure a Supabase application, fix broken API integrations, or take an AI prototype to production 🔹
I’d be happy to learn more about your SaaS or AI product and discuss how I can help as your Full Stack Developer.
Send me a message or invite me to your project. I look forward to hearing what you’re building :)
𝗞𝗲𝘆𝘄𝗼𝗿𝗱𝘀:
Full Stack Developer | Full Stack SaaS Developer | SaaS Application Development | AI Full Stack Developer | SaaS Developer | Full Stack Developer | React Developer | Next.js Developer | Node.js Developer | NestJS Developer | Full Stack Developer | TypeScript Developer | Python Developer | Full Stack Developer | PostgreSQL | Supabase | REST API | API Developer | API Integration | API Development | Full Stack Developer | AI App Development | AI Agent Development | OpenAI | Claude | LLM Integration | Multi-Tenant SaaS | Backend Developer | Full Stack Developer | MVP Developer | AWS | Vercel | CI/CD | Docker | GraphQL | Application Security | Full Stack Developer | AI-Integrated Solutions
Steps for completing your project
After purchasing the project, send requirements so Aaron can start the project.
Delivery time starts when Aaron receives requirements from you.
Aaron works on your project following the steps below.
Revisions may occur after the delivery date.
Technical review
I reproduce the current behaviour and verify the requested scope.
Risk prioritization
We confirm the issues included in the selected package.