Principal/Staff GenAI Architect/Engineer

Job Description — Join Callidus, the most advanced legal generative‑AI platform to take on our most challenging generative AI tasks, following a recent funding round. Competitive total compensation. Hustle culture. San Francisco. About Callidus 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 making significant progress. Callidus is the most advanced legal generative AI platform today. Our platform enables lawyers to draft a full 30‑page legal brief in approximately 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, with ARR growing over 20% MoM, placing us in the top 1% of funded startups at this level. We’re ready to scale and plan to triple our team size. We work hard, ship fast, and win together. Your Role We seek an architect-level engineer to lead our most ambitious generative AI projects as both architect and engineer. You’ll be an individual contributor, expected to: Set up optimized RAG/hybrid RAG systems. Build sophisticated agents. Fine-tune custom models. Customize open-source models via extended pretraining for deeper capabilities. Optimize our key API calls for maximal results on evals. Decide quickly on the best models for our API calls or set up systems. Make intelligent tradeoffs on speed, scale, and quality. Seniority Level Hiring Principal/Staff level engineers/architects, typically with 8-15 years post-college experience and 2-5 years in the generative AI space. Reporting to the Head of Engineering. Tech Stack Cloud: Azure Backend: Python (FastAPI), Redis, Postgres Frontend: React/Next.js, Node AI: OpenAI, Anthropic, Gemini, Meta, Mistral (selecting best‑in‑class per task) Requirements What We’re Looking For Core Requirements Proficiency in Python and ideally React/Next.js. Proven ability to ship high‑quality products quickly. Deep experience with LLM APIs and prompt engineering. Ability to implement advanced LLM techniques (hybrid RAG, hallucination guardrails, agentic workflows, agents, etc.). Experience in startups or LLM-focused companies. Willingness to commute to San Francisco office 3-5 days per week. Soft Skills Clear and concise communicator. Ownership mindset—delivering on commitments and surfacing risks early. Ability to work with ambiguity and minimal process. Strong problem-solving skills. Passion & Dedication Genuine enthusiasm for AI and building category-defining products. Excellent work ethic and capacity for demanding roles. Understanding that this role requires high effort, driven by passion for the mission. Nice‑to‑Haves Legal or LegalTech experience. Strong DevOps skills on Azure or other cloud platforms. Personal use of AI tools (Cursor, CoPilot, Midjourney, etc.). Automation and side projects related to productivity hacks. Engineering degree. Interview Process (fast!) Meeting with a sourcing manager or Head of Ops. Connecting with our Head of Engineering. Interview with another engineer. Final session with CEO. We move quickly for the right candidate. Location San Francisco, CA No relocation budget; applications are welcome if willing to move. In-office at least 3 days/week. Benefits Compensation Base Salary: $220,000 - $300,000 Meaningful equity Comprehensive medical, dental, vision, and life insurance PTO and holidays Why Join Callidus? Work on transformative technology. Own significant product pieces in an engineering-led, high-talent team. Be among the first 15 employees at a rapidly growing company. Tackle high-impact, complex problems avoided by competitors. Reap rewards in equity and professional growth. Callidus is an equal opportunity employer and does not discriminate based on various protected categories.

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