I build AI products from zero to one.
I'm James Costantini, a founder and operator in San Francisco. I help teams turn AI capability into useful products, workflows, and companies with product-market fit.
A few of the companies, products,
and systems I've shaped.
My current consulting platform for AI product strategy, agentic workflow design, and practical implementation. Through Aitherium, I work with startups, SMBs, and mid-market teams that need production-ready AI without losing control of their IP.
Visit AitheriumAn AI-enabled operating layer for independent physician practices — launch, operate, and grow with cleaner workflows, managed infrastructure, and more ownership.
Visit BioscopeA model-agnostic reasoning layer above LLMs. Sanscritic separates reasoning from the underlying model so domain judgment, workflows, and business logic can be shaped deliberately.
Visit SanscriticAn AI healthcare companion built around care loops: notice, ask, check context, explain, help, and follow up. Useful, careful, and human-readable.
Visit MilliLed product for Sahara's Agent Builder and AI Marketplace launch — making agent creation a simple flow from model selection and knowledge upload to testing and deployment.
Visit SaharaWhat I do
I help teams move from ambiguous AI possibility to a clear product, operating model, and execution path.
AI product strategy
I help teams decide what should be built, where AI belongs, what users need, and what has to be true for the system to work in production.
Product development
I move ideas from prototype to usable product: workflows, MVP scope, user experience, agent behavior, launch sequencing, and product-market fit.
Business operations
I help founders connect product, operations, narrative, GTM, and measurement so the work becomes a company, not just a demo.
How I work.
About
I'm James Costantini, a founder and operator based in San Francisco. I've built companies, led product teams, advised startups, and worked across agentic AI, healthcare, fintech, enterprise automation, data products, and consumer software.
My work sits at the intersection of AI, product design, business operations, and human behavior. I'm usually useful when a team has a powerful technical capability, a messy business problem, and a need to turn both into something people can actually use.
I started early. In high school, I launched Life Sucks Inc., a parody brand that turned legal pressure and media attention into my first real lesson in narrative, distribution, and market timing. The tools have changed. The pattern is the same: build something sharp, make it useful, and learn from the market quickly.
Let's build something useful.
I work with founders, product teams, and operators building AI-native products and companies — consulting, advisory, product strategy, agentic workflows, startup opportunities, and speaking.
No vendor pitches or generic sales outreach.