Principal/Staff Full-Stack GenAI Application Engineer (AI / LegalTech / SF)

We are entering the golden era of AI. Over the next 5-10 years, breakthroughs will drive a completely new world. Callidus is on a mission to transform the $1T global legal market and we’re well on our way.

Callidus is the most advanced legal generative AI platform on the market today. We offer a uniquely powerful platform, enabling lawyers (as one example) to draft a full 30‑page legal brief in ~10 minutes—saving about a week of effort. We are an engineering‑led organization that empowers talent to build collaboratively toward our mission.

More than 1,000 paying lawyers rely on Callidus today, and ARR is growing >20% MoM, putting us in the top 1% of funded startups at this level. We’re ready to scale and are looking to triple the size of our team.

We work hard, ship fast, and win together. 

We want highly talented engineers that want to be hands-on. We don’t want a bunch of managers. You’ll be an individual contributor Software Engineer (everyone at Callidus is a doer). Expect to:

- Design, build, and maintain customer‑facing features end‑to‑end.

- Engineer reliable, scalable Gen‑AI workflows (hybrid RAG, agents, chains of thought, etc.).

- Collaborate daily with lawyers and product to ship measurable user value.

- Own projects like “ingest millions of PDFs and summarize the legally relevant findings for this case”.

- Uphold code quality, security, and performance through reviews and automated tests.

Hiring for Principal/Staff level Full-Stack engineers. Typically 7-15y post-college experience.

This role will report to the Head of Engineering.

- Cloud: Azure

- Backend: Python (FastAPI), Redis, Postgres

- Frontend: React / Next.js, Node

- AI: OpenAI, Anthropic, Gemini, Meta, Mistral (choosing best‑in‑class per task)