Senior Full-Stack AI/Product Engineer — SaaS Technical Owner

Perenna OS is seeking one exceptional Senior Full-Stack AI/Product Engineer to take hands-on technical ownership of a growing SaaS platform. This is not a narrow coding role and not a large-team environment. We need a pragmatic builder who can understand business workflows, make sound architecture decisions, ship product, debug production issues and communicate clearly with a non-technical founder.

Core responsibilities:

• Own product delivery from specification to deployment
• Build and maintain frontend, backend, APIs, databases and integrations
• Develop practical AI features, agents, automations and retrieval workflows
• Design reliable multi-tenant SaaS architecture, authentication and permissions
• Integrate third-party services and payments where required
• Maintain testing, security, observability, documentation and deployment
• Break ambiguous requirements into sensible priorities and iterative releases

Required evidence:

• Strong React/Next.js and TypeScript experience
• Strong Node.js and/or Python backend experience
• PostgreSQL or equivalent relational database experience
• Production AI/LLM integrations, RAG, tool/function calling or agent workflows
• Deployment experience with AWS, Vercel, Docker or comparable infrastructure
• A portfolio, live products or repositories showing end-to-end ownership
• Excellent written English and proactive communication

Selection process:
1. Portfolio and architecture review
2. Short logical/numerical and debugging exercise
3. Paid, tightly scoped practical task if appropriate
4. Founder interview

Please apply with links to live products or code, explain exactly what you personally built, describe one difficult production problem you solved, state your full-time availability and monthly expectation. We value long-term ownership, judgement and clear thinking more than buzzwords.