Nevily Simiyu

I am a Full-Stack Engineer specializing in building AI-powered SaaS platforms that integrate Large Language Models securely with real business data.

Recent work includes:
• AI-powered customer support SaaS with subscriptions and WhatsApp integration
• Hotel booking platform with Stripe & Mpesa payments
• Real-time collaboration platform using Socket.io
• Multi-module creator platform (courses, email marketing, automation)


I don’t just connect OpenAI to an app — I design production-ready AI systems that:

Query databases securely using structured tool-calling

Respect multi-tenant data isolation (RLS enforced)

Deliver accurate, structured responses

Scale from MVP to production

With 4+ years of experience in the Next.js and MERN ecosystem, I focus on the intersection of:

• Generative AI
• Secure SaaS architecture
• Financial and operational data systems

🚀 AI & LLM Specialization

AI Assistants & Agents
Custom GPT-4o, Claude, and Gemini integrations using structured tool-calling patterns.

Secure Database Integration
Server-side AI routes (Next.js App Router) with Supabase/PostgreSQL.
Strict RLS enforcement — no unsafe SQL generation.

RAG Architecture
Embeddings + Vector Databases (pgvector, Pinecone) for high-accuracy knowledge retrieval.
Openclaw + vps(aws, google console vm instance) installation connection to crm and google calendar

AI SaaS Infrastructure
Multi-tenant chatbot platforms with usage tracking, subscription billing, and scalable architecture.

🧱 Full-Stack Expertise

Frontend
Next.js (App Router), React, Tailwind CSS

Backend
Node.js, Express, Supabase, PostgreSQL, MongoDB

Fintech
Stripe (Subscriptions & One-Time Payments)
M-Pesa Integration
PayPal Integration

Deployment
Vercel, Docker, CI/CD

🛡 Why Clients Hire Me

Security First
I design AI systems that never bypass database protections.

Production Thinking
Clean architecture. Maintainable code. Clear documentation.

Business-Aware AI
I build AI that understands financial data, healthcare logic, and SaaS metrics — not just chatbots.

If you're building:
• A Chat-to-SQL financial assistant
• An AI customer support platform
• A multi-tenant SaaS with LLM integration
• Custom AI agents, open claw installation and integrations


Let’s build it the right way.