Senior React / Next.js Developer for AI SaaS Platform (Long-Term)

Senior React / Next.js Developer for AI SaaS Platform (Long-Term) We are looking for a senior full-stack developer to join our product team on a long-term basis. Our company develops AI-powered SaaS products for small and medium-sized businesses. We already have a working web application and are looking for someone who can not only write clean code but also help improve the overall architecture and technical direction of the platform. Current Stack * React * Next.js * TypeScript * Node.js * PostgreSQL * Prisma * Stripe * OpenAI / Anthropic APIs * GitHub * Vercel Current Priorities * Integrate Stripe subscriptions and customer billing * Improve authentication and account management * Optimize performance and application architecture * Refactor existing modules where necessary * Build new AI-powered features * Improve prompts, AI workflows, and LLM integrations * Connect third-party APIs and automation services * Fix bugs and improve overall stability * Participate in technical planning and architecture decisions What You’ll Be Working On This is not a typical website project. Our platform combines traditional SaaS functionality with AI capabilities. We use large language models to automate business workflows, generate content, analyze data, and assist users inside the application. We are looking for someone who understands modern AI development, knows how to integrate LLM APIs efficiently, and can help design scalable AI architecture rather than simply calling an API. Requirements * 5+ years of experience with React and Next.js * Strong TypeScript knowledge * Experience with Node.js backend development * Experience with PostgreSQL and Prisma * Experience integrating Stripe subscriptions and payments * Experience working with AI APIs (OpenAI, Anthropic, Gemini or similar) * Understanding of prompt engineering and AI workflows * Strong architectural thinking * Good Git workflow * Fluent written English Nice to Have * Experience building SaaS products * Experience with RAG systems or AI agents * Experience with vector databases * Experience with background jobs and queues * Experience with Docker * Experience with CI/CD What We Offer * Long-term collaboration * Interesting AI product with active development * Direct communication with the founder * Freedom to propose technical solutions * Opportunity to influence product architecture from an early stage * Flexible working hours To Apply Please include: * A brief introduction * Relevant React / Next.js projects * AI-related projects you’ve worked on * Experience with Stripe integrations * Your availability (hours per week) * Your hourly rate Please start your proposal with the word “Architecture” so we know you’ve read the entire description.