{"id":27433,"url":"https://alion.io/job/kastle-staff-ai-engineer","title":"Staff AI Engineer","company":{"id":7389,"name":"Kastle","domain":"kastle.ai","url":"https://alion.io/company/kastle","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"C","score":68,"open_postings":13,"ghost_share":0.538,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-16T05:45:00Z"}},"role":"AI/ML","role_family":"AI/ML","seniority":"staff","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["San Francisco, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":250000,"max":350000,"currency":"USD","period":"year","gross":null,"usd_annual":350000},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AI Agents","optional":false},{"name":"LangChain","optional":false},{"name":"LlamaIndex","optional":false},{"name":"LLM","optional":false},{"name":"Prompt Engineering","optional":false},{"name":"Python","optional":false},{"name":"PyTorch","optional":false},{"name":"TensorFlow","optional":false},{"name":"Voice Agents","optional":false}],"status":"live","first_seen_at":"2025-11-22T00:11:17Z","employer_posted_date":"2025-11-22","last_verified_at":"2026-10-16T14:38:08Z","board_verified":true,"closed_at":null,"days_open":328,"trust":{"level":"ghost","repost_count":0,"flags":["stale","company_stale"],"days_open":328},"description":"About Kastle\nKastle is building the AI employee for banks. We work with some of America's largest financial institutions, helping them scale their contact center and compliance operations using autonomous AI Agents that process payments, originate loans, and help customers get a world class experience during the biggest financial decisions of their lives. We've processed over $2 billion in transactions and are backed by Insight Partners and Y Combinator. If you are interested in building AI that is applied in the real world where precision, reliability, and performance matter and redefine access to credit across the world, apply below.\nWe just raised a $24M Series A and are growing fast!\nAbout the Role\nAs a Founding Applied AI Engineer, you'll be instrumental in building the technical foundation of Kastle's AI platform. You'll fine-tune large language models, design AI workflows for highly regulated enterprises, and ensure our voice agents deliver precise, compliant, and effective borrower interactions.\nThis role is ideal for an engineer who is passionate about applied AI, eager to solve real-world challenges, and excited to build the technical foundation of an early-stage AI startup.\nWhat You'll Do\nAI Model Integration: Fine-tune and deploy LLMs for real-time voice-based borrower interactions\n\nPrompt Engineering: Design and iterate on prompt strategies to optimize AI performance and compliance\n\nEvaluate LLMs and AI Agents: Build high quality evals using our proprietary datasets to benchmark AI agent performance and run experiments\n\nCustom AI Solutions: Train and implement domain-specific AI models for consumer lending\n\nScalability & Compliance: Ensure AI solutions meet regulatory standards (FDCPA, RESPA, TILA) and scale efficiently\n\nData Pipelines & APIs: Build robust AI-driven workflows that integrate seamlessly with loan servicing platforms\n\nContinuous Optimization: Monitor performance metrics and continuously improve agent quality and borrower experience\n\nWhat We're Looking For\n3+ years building and deploying ML/AI systems in production environments\n\nStrong proficiency in Python and deep learning frameworks (TensorFlow, PyTorch)\n\nExperience with LLM orchestration frameworks (LangChain, LlamaIndex, or similar)\n\nTrack record of shipping end to end AI systems that is at the core of company operations\n\nStrong product mindset and ability to translate business requirements into AI solutions\n\nExcellent communication skills to collaborate across product, engineering, and compliance teams\n\nWhy join Kastle\nOpportunity to work with a world class team building a generational AI company that will redefine how every loan in America is made and managed\n\nAbility to move fast while your work impacting millions of customers. 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