Senior Full-Stack Engineer (Next.js / PostgreSQL / Enterprise SaaS)

This role requires a true full-stack architect. You will be responsible for deconstructing a massive legacy monolithic application into modular React (Next.js) components, while simultaneously building the secure, multi-tenant PostgreSQL backend to support it. You will also build secure middleware to integrate with enterprise ecosystems like Microsoft 365 (SharePoint/Graph API).

We empower our engineering team with the best tools available. We expect you to be a power-user of modern AI coding assistants (Cursor, GitHub Copilot, Claude) to accelerate boilerplate generation, debugging, and refactoring so you can focus on high-level architecture and security.

What You'll Do

• Frontend Architecture: Deconstruct a massive legacy codebase and refactor it into clean, reusable React (Next.js) components using a strict design system. Implement complex global state management for real-time UI updates.
• Backend & Security: Design and deploy normalized PostgreSQL databases. Write and rigorously test strict Row-Level Security (RLS) policies to guarantee absolute data isolation across user roles.
• Enterprise Integrations: Develop microservices to integrate deeply with the Microsoft Graph API. You will handle Entra ID OAuth2 tokens, index SharePoint metadata and configure webhooks for automated folder syncing.
• Document Generation: Develop server-side pipelines to programmatically generate pixel perfect, branded Excel and Word reports.
• DevOps & AI: Build a secure, serversi de API Gateway to route requests to LLM APIs, ensuring strict data redaction. Configure GitHub Actions CI/CD pipelines for zero-downtime deployments.

Requirements

What You Bring to the Table

• 4+ years of full-stack engineering experience, with production-level expertise in Next.js (App Router, SSR, API routes) and NodeJS.
• Deep expertise in PostgreSQL. (Experience with AWS, Migrations, and writing complex RLS policies is a massive plus).
• A proven track record of untangling and modernizing legacy spaghetti code.
• Experience integrating enterprise APIs, specifically Microsoft Graph API, SharePoint and Azure AD OAuth flows.
• You are highly proficient in using AI coding assistants to multiply your output, refactor code rapidly and execute complex logic efficiently.
• A Security-First mindset, familiar with OWASP top 10 standards and building systems that pass rigorous enterprise IT audits.