Senior Full-Stack & Mobile Engineer – Next.js, Supabase, React Native

About the role

We are seeking a senior full‑stack and mobile engineer to take ownership of Pool Companion, a SaaS platform for pool service businesses. The product is already functional and includes a web dashboard, iOS technician app, scheduling, routing, GPS tracking and more. You will work closely with the founder and real‑world technicians to audit, improve and evolve the system into a production‑grade commercial service.

Key responsibilities

• Conduct a thorough technical audit of the existing codebase and architecture.
• Identify and remediate technical debt, high‑risk areas, and performance bottlenecks.
• Review and enhance database design, Supabase implementation, and Row Level Security policies.
• Improve authentication, multi‑tenant security, and overall reliability.
• Enhance the iOS/React Native app, including GPS tracking, offline behavior, photo uploading and data syncing.
• Strengthen API integrations, webhook reliability, and Stripe payment flows.
• Implement automated testing, CI/CD pipelines, and robust deployment processes.
• Set up monitoring, logging, and error‑reporting for both staging and production.
• Evaluate and refactor AI‑generated code where appropriate.
• Collaborate with the founder to design and build new features as the product evolves.

Required profile

• Proven experience building and maintaining production‑grade SaaS applications.
• Ability to work independently, take technical ownership and make proactive decisions.
• Strong problem‑solving mindset with a focus on reliability and scalability.
• Comfortable collaborating directly with end‑users (technicians) to gather feedback.

Required skills

• Next.js
• React
• TypeScript
• Supabase
• PostgreSQL
• React Native (iOS)
• APIs and webhooks
• Stripe integration
• GitHub
• Cloud hosting platforms
• AI‑assisted development tools