Martins R

Full Stack Developer Next.js, React & PostgreSQL

Jan 2026 - Present • 7 mos

Full stack web application development for startups, founders, and small businesses. Built and shipped production applications using Next.js, React, TypeScript, Node.js, and PostgreSQL, with backend services on Supabase and Firebase. Frontend: Next.js App Router, React, TypeScript, Tailwind CSS, responsive layouts, dashboards, admin panels, and client portals. Built for speed, mobile responsiveness, and search visibility. Backend and database: PostgreSQL and Supabase schema design, table relationships, normalization, indexing, CRUD operations, and query optimization. REST API development and third-party API integration. Authentication and authorization with email login, Google and GitHub OAuth, magic links, JWT sessions, and role-based permissions. Integrations: Stripe payments, subscriptions and webhooks, transactional email, file and image storage, and workflow automation. Deployment: Vercel, Netlify, AWS, and Render. GitHub version control and CI/CD pipelines, environment variable management, custom domain connection, DNS records, and SSL configuration. Typical projects: SaaS MVPs, marketplace platforms, booking and management systems, business dashboards, and rebuilding prototypes from AI builders into maintainable production code the client owns. Delivered with clean, documented, scalable code and clear communication at every milestone.

Backend Developer Supabase & PostgreSQL

Oct 2025 - Present • 10 mos

Supabase backend development, security auditing, and PostgreSQL database architecture for web applications, SaaS platforms, and AI-generated apps. I audit Supabase projects for Row Level Security (RLS) misconfiguration, exposed API keys, broken authentication flows, missing indexes, and unsafe storage bucket permissions, then deliver a written report and fix what is critical. Core work: Supabase project configuration and setup, RLS policy design and correction, PostgreSQL schema design and normalization, database indexing and slow query optimization, Supabase Auth (email, OAuth, magic link, role-based access), Supabase Edge Functions, realtime subscriptions, storage buckets, and REST API integration. I work heavily with backends scaffolded in AI builders — Lovable, Lovable Cloud, Replit, Bolt.new, Base44, v0, Cursor, and Claude Code. These ship a working frontend fast but usually leave the backend incomplete: no RLS, keys in the client, unstructured tables. I take those projects to production. Deployment and migration: Vercel, Netlify, AWS, Render, GitHub CI/CD, custom domain and DNS configuration, SSL, environment variables. Migrations handled include Firebase to Supabase, Replit to AWS, Vercel to GoDaddy, and Base44 to production hosting. Stack: Supabase, PostgreSQL, SQL, Next.js, React, TypeScript, Node.js, Firebase, Stripe, Docker. Every engagement ends with documentation in plain language, so the client or their next developer can maintain the work without me.