Sr Full-Stack Engineer - Next.js, Supabase & Row-Level Security (RLS) (FT-NA)

• Integrate and enhance an existing Next.js 14 + TypeScript application for a robust production environment.
• Design, implement, and rigorously test Supabase Row-Level Security (RLS) policies to ensure secure multi-tenant data segregation.
• Conduct comprehensive testing of RLS policies to prevent unauthorized cross-tenant data access.
• Develop and maintain authentication, organizational access, roles, and permissions.
• Collaborate extensively with Supabase/PostgreSQL for database management, including real-time subscriptions.
• Integrate third-party APIs and manage production webhook workflows for various external services.
• Develop server-side API routes and application logic using Next.js.
• Implement scheduled and cron-based workflows in a serverless or edge environment.
• Support real-time collaboration and messaging using Supabase subscriptions.
• Integrate AI-powered functionalities using LLM APIs.
• Ensure secure handling of API keys, credentials, and secrets through environment variables.
• Deliver responsive applications optimized for both desktop and mobile platforms.
• Execute deployment of builds and production environments using Vercel.
• Conduct thorough QA, performance reviews, security hardening, and production-readiness testing.
• Maintain a disciplined GitHub commit history and thrive in an async-first work environment.

English・Native/bilingual, * Extensive production experience with Next.js and TypeScript, including server-side API development.

• Proven expertise with Supabase and PostgreSQL.
• Demonstrated success in implementing Supabase Row-Level Security (RLS) for secure multi-tenant data management.
• Experience in developing multi-tenant SaaS applications with complex access models.
• Proficiency in integrating third-party APIs and managing production webhooks.
• Experience with serverless or edge environment scheduled tasks.
• Strong grasp of backend security, authorization, and secure secret management.
• Ability to adhere to detailed specifications and execute precise requirements.
• Excellent written communication skills in English and the ability to work independently., * Experience with LLM API integration using Anthropic or OpenAI.
• Familiarity with Stripe for payment processing.
• Experience with e-signature platforms like DocuSign.
• Knowledge of email platforms such as Resend.
• Experience with notification tools like Knock or Novu.
• Familiarity with SMS platforms such as Twilio.
• Understanding of email deliverability standards, including SPF, DKIM, and DMARC.
• Experience with deploying applications on Vercel.