Question: Can you recommend a solution that handles complex database queries and payment integrations for SaaS development?

For SaaS development's more complex database queries and payment integration, Supabase is a top contender. It's an open-source Firebase alternative with a Postgres database, real-time subscriptions and built-in user management. Supabase supports Next.js and Svelte frameworks and has features like edge functions, large file storage and vector embeddings. It also has templates for common use cases like Stripe Subscriptions, so it's a good all-purpose SaaS foundation.

Another powerful option is ROQ, which is designed to handle secure database queries, authentication, authorization and monetization. ROQ includes managed Postgres database deployment, secure frontend DB queries and integration with Stripe for payments and subscriptions. Its multi-tenancy and role-based access control features are good for building highly scalable and resilient SaaS apps.

If you want a serverless data foundation, Xata is a good option. Built on PostgreSQL, it's got features like serverless Postgres, zero-downtime schema migrations and AI integration. Xata supports a range of frameworks and tools and offers large free tiers for growing projects. Its elastic scaling and collaborative dashboard make it a good option for complex SaaS apps.

If you want a full-stack SaaS boilerplate, SaaSBold offers a lot of what you might need. It's built on Next.js, React and Node.js, and includes common integrations like payments and subscriptions with Stripe and LemonSqueezy, transactional emails and a modern admin dashboard. With features like AI integration and multidimensional authentication, SaaSBold is designed for good SEO and performance, too, so it's a good option for SaaS product development.