Mayara A.

Full-stack developer for SaaS products. I build with Next.js and React on the front end, NestJS/Node.js and PostgreSQL on the back end, and TypeScript throughout. I take startup and product-team projects from MVP to production, and add AI features (OpenAI or Claude API integrations, LLM-powered workflows) when the product needs them. Top Rated on Upwork, 100% Job Success, 846+ hours. Clients describe me as responsive and thorough. What I can do for you: → Build or extend a SaaS web app: Next.js, React, Tailwind, SSR, PWA → Design and ship REST or GraphQL APIs: NestJS, authentication, PostgreSQL schema and query tuning → Audit an existing codebase: rigorous code review and QA, finding gaps between the code and the spec (a recent client hired me for exactly this) → Add AI features: OpenAI and Claude API integrations → CI/CD and AWS deployment Recent work: Finkith, an income-and-bills tracking PWA built with Next.js, React, TypeScript and Supabase. How I work: I use an AI-assisted workflow (Claude Code) for faster iterations and a second pass of code review before anything ships. I estimate honestly, communicate clearly, and deliver without surprises. To get started, message me with what you are building, your stack, and your timeline. I will tell you straight whether I am the right fit.