SaaS Launch Support Engineer - Next.js / Supabase / Vercel

We are looking for a strong full-stack engineer to join us during the production launch and continued growth of a large SaaS platform. This is not a greenfield MVP. The application is already built and launching into production. We need someone who is comfortable stepping into an established codebase, understanding existing architecture quickly, monitoring production behavior, diagnosing issues, and making clean, targeted fixes without introducing unnecessary changes. There is an immediate need for coverage during U.S. business hours, with the opportunity for this to become an ongoing position for the right person. Tech Stack Next.js React TypeScript Supabase PostgreSQL Vercel Git / GitHub Stripe REST APIs Third-party payment and communications integrations Experience with Resend, Twilio, OpenAI APIs, webhooks, RLS, payment systems, or production observability is a plus. What You'll Be Doing During launch and ongoing production support, you'll be responsible for monitoring application behavior and responding quickly when something isn't working correctly. That includes: Monitoring Vercel application and server logs Monitoring Supabase/database behavior Investigating production errors and failed requests Diagnosing API and webhook failures Troubleshooting authentication and permission issues Investigating database/RPC failures Debugging third-party integrations Fixing frontend and backend production defects Identifying whether an issue is application code, configuration, data, or an external provider Testing fixes before deployment Reviewing browser console/network errors Helping validate critical customer workflows Documenting what failed, why it failed, and what was changed Escalating issues where a quick fix would create unnecessary production risk You will be working alongside an existing development team. We are not looking for someone to come in and rewrite or redesign the application. What We're Looking For You should be able to open an unfamiliar production codebase and independently trace something like: browser → Next.js route → server logic → Supabase/Postgres → third-party provider → response and determine where the failure actually occurred. Strong candidates will have real experience with: Debugging production SaaS applications Next.js server and client architecture Supabase/PostgreSQL SQL and database troubleshooting Row Level Security API integrations Webhooks Environment/configuration issues Authentication and authorization Git workflows Reading logs and stack traces Making targeted fixes without unnecessary refactoring Important This is a live production application. We value engineers who are careful and methodical under pressure. If something breaks, we do not want someone immediately rewriting working systems or making broad architectural changes. We want someone who can: identify → reproduce → isolate → fix → test → verify and clearly communicate what happened. Availability You must be available during U.S. Central Time business hours. Immediate availability is strongly preferred. There is potential for substantial ongoing work and a longer-term role for someone who performs well and works effectively with the existing team. When Applying Please include: Your experience with Next.js, TypeScript, Supabase and PostgreSQL. An example of a production issue you personally diagnosed and fixed. Your experience debugging webhooks or third-party API integrations. Your experience with Vercel. Your normal working hours and timezone. Whether you are available during U.S. Central Time. Your hourly rate. How soon you can start. Please do not send a generic agency introduction. We are looking for someone who can work directly with the codebase and communicate clearly with our team.