Senior Software Engineer (Part-Time / On-Call)

Seeking a versatile Senior Software Engineer (part-time, on-call) to support a diverse technical portfolio—from AI-integrated SaaS to high-performance cloud infrastructure. Ideal candidate excels in at least two areas: AI/ML & data (LLMs, prompt engineering, LangChain, vector DBs), Python full-stack (FastAPI/Django, async, ORMs), Node.js/TypeScript (backend, React/Next.js), or infrastructure (AWS, Docker, Kubernetes). Responsibilities: deliver production-ready code across concurrent projects, provide reliable on-call support and rapid troubleshooting, translate requirements into scalable architectures, and uphold rigorous documentation, testing, and code quality standards. Long-term potential to transition into a full-time lead role.