Senior Full Stack Engineer

SergioNader

Full stack engineer with 20+ years building production SaaS applications. I combine deep architectural expertise with hands-on AI integration to ship products end-to-end — from database to deployment.

Live Project

AdaptAI.chat

A full-stack AI SaaS platform I built from zero to production. Compare and use 200+ AI models from OpenAI, Anthropic, Google & Mistral through a single unified interface.

Explore the platform
200+ AI Models
1,000+ Tests
100% API Coverage

What I Do

Backend Engineering

Production APIs and service architectures built for scale, with robust testing and clean separation of concerns.

Python FastAPI Laravel PostgreSQL Redis

Frontend Development

Responsive, performant interfaces with modern tooling — from data-heavy dashboards to polished user-facing applications.

React Next.js TypeScript Chakra UI

AI Integration

Multi-provider AI orchestration, real-time streaming, prompt engineering, and cost-optimized LLM integration into production products.

OpenAI Anthropic OpenRouter SSE Streaming

Cloud & DevOps

End-to-end AWS infrastructure, CI/CD pipelines, automated backups, and production deployment workflows.

AWS Docker Nginx CI/CD

SaaS & Payments

Full billing system architecture — subscriptions, credit-based pricing, proration, webhooks, and multi-tier monetization.

Stripe Subscriptions Credit Systems

Track Record

20+

Years Shipping Software

From eCommerce platforms and retail analytics to enterprise SaaS and AI products — across PHP, Ruby, Python, and JavaScript.

8yr

Remote at The Brandit Agency

Led full-stack development for enterprise B2B SaaS clients. Built APIs, React dashboards, and AWS infrastructure serving multiple high-traffic applications.

98%

Support Workload Reduction

Built an intelligent email automation system that cut per-ticket processing from 5 minutes to 5 seconds through automated parsing and routing.

SSO

Unified Auth Platform

Designed a custom JWT-based SSO consolidating multiple client systems into a single authentication platform serving thousands of users.

Let's Build
Something

Available for full-time remote roles, consulting, and collaboration on AI-powered products. Based in Orlando, FL with 8+ years of fully remote experience.

Email
LinkedIn
linkedin.com/in/sergionader
Location
Orlando, FL, USA · Remote