Principal AI Engineer

Apollo.io is a leading go-to-market solution for revenue teams, trusted by over 500,000 companies and millions of users. They are seeking a Principal AI Engineer to lead the design and deployment of cutting-edge agentic systems, AI assistants, and LLM-powered features. The role is crucial to Apollo’s AI roadmap, owning the architecture and productionization of intelligent systems that power the workflows of thousands of GTM teams globally.

Requirements

• 10+ years of software engineering experience, with at least 3 years in applied LLM or agentic AI systems (2023–present).
• Proven success in deploying LLM-powered products used by real users at scale.
• Deep backend & systems engineering expertise with Python, distributed systems, and scalable APIs.
• Familiarity with LangChain, LlamaIndex, or similar orchestration frameworks.
• Experience with RAG pipelines, vector DBs, embedding models, and semantic search tuning.
• Experience managing performance across cloud providers (e.g., AWS Bedrock, OpenAI, Anthropic, etc.).
• Experience designing safety-aware, reliable LLM systems in production environments.
• Experience owning logging, monitoring, and observability for live AI systems.
• Leadership & Strategic Impact

Benefits

• Growth Opportunities
• Autonomy
• Impactful Work