Asar A.

Full Stack SaaS Developer

Freelance / Self-Employed • Autônomo

Jan 2023 - Present • 3 yrs 6 mos

Specialized in building high-performance SaaS platforms and AI-driven automation tools for global startups. As a Full Stack Engineer, I partner with founders and businesses to turn complex requirements into scalable, production-ready software. My focus is not just on writing code, but on engineering systems that are secure, fast, and cost-efficient. CORE RESPONSIBILITIES & ACHIEVEMENTS: 🚀 AI & Automation Engineering: Designed and deployed custom AI Agents using OpenAI (GPT-4) and Anthropic (Claude) APIs to automate business workflows. Built "Smart Email" systems capable of parsing PDF attachments, generating context-aware summaries, and drafting auto-replies using RAG (Retrieval-Augmented Generation). Implemented Vector Embeddings for semantic search functionality within document management systems. 💻 Modern SaaS Architecture: Developed end-to-end SaaS MVPs using the Next.js App Router (Server Actions) and TypeScript for type-safe stability. Architected secure database schemas in PostgreSQL (Supabase), implementing strict Row Level Security (RLS) policies to protect user data. Integrated Stripe Connect and Subscription Webhooks to handle tiered pricing models and recurring billing securely. ⚡ Performance & Optimization: Optimized React application performance, achieving 95+ scores on Google Core Web Vitals by utilizing server-side rendering (SSR) and dynamic imports. Refactored legacy Monolithic codebases into modular, scalable Microservices architectures. Tech Stack: Next.js, React, Node.js, Supabase, PostgreSQL, Tailwind CSS, OpenAI API, LangChain, Stripe.