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Staff AI Engineer

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Apollo.io

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Location:
United States

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Category:
IT - Software Development

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Contract Type:
Not provided

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Salary:

200000.00 - 280000.00 USD / Year
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Job Description:

As a Staff AI Engineer on our AI Engineering team, you will be responsible for building and productionizing advanced AI systems powered by Large Language Models (LLMs) and intelligent agents. You'll work on critical Apollo capabilities including our AI Assistant, Autonomous AI Agents, Deep Research Agents, Conversational Assistant, Semantic Search, Search Personalization, and AI Power Automation features that directly impact millions of users' productivity. The mission of our AI teams is to leverage Apollo's massive scale data and cutting-edge AI to understand and predict user behaviors, personalize experiences, and optimize every stage of the customer journey through intelligent automation.

Job Responsibility:

  • Design and Deploy Production LLM Systems
  • Create sophisticated AI agents that can chain multiple LLM calls, integrate with external APIs, and maintain state across complex workflows
  • Develop and optimize prompting strategies
  • Build robust APIs and integrate AI capabilities with existing Apollo infrastructure and external services
  • Implement comprehensive evaluation frameworks, A/B testing, and monitoring systems
  • Optimize for cost, latency, and scalability across different LLM providers and deployment scenarios
  • Work closely with product teams, backend engineers, and stakeholders to translate business requirements into technical AI solutions
  • Build sophisticated multi-agent systems that can reason, plan, and execute complex sales workflows
  • Develop systems that maintain conversational context across complex multi-turn interactions
  • Build scalable large language model and agentic platforms
  • Build back-end systems necessary to support the agents

Requirements:

  • 8+ years of software engineering experience with a focus on production systems
  • 1.5+ years of hands-on LLM experience (2023-present) building real applications with GPT, Claude, Llama, or other modern LLMs
  • Demonstrated experience building customer-facing, scalable LLM-powered products with real user usage
  • Experience building multi-step AI agents, LLM chaining, and complex workflow automation
  • Deep understanding of prompting strategies, few-shot learning, chain-of-thought reasoning, and prompt optimization techniques
  • Expert-level Python skills for production AI systems
  • Strong experience building scalable backend systems, APIs, and distributed architectures
  • Experience with LangChain, LlamaIndex, or other LLM application frameworks
  • Proven ability to integrate multiple APIs and services to create advanced AI capabilities
  • Experience deploying and managing AI models in cloud environments (AWS, GCP, Azure)
  • Experience implementing rigorous evaluation frameworks for LLM systems including accuracy, safety, and performance metrics
  • Understanding of experimental design for AI system optimization
  • Experience with production monitoring, alerting, and debugging complex AI systems
  • Experience building and maintaining scalable data pipelines that power AI systems

Nice to have:

  • Experience with Search Scoring & Ranking
  • Experience with Entity Extraction
  • Experience with Lookalike & Recommendation Systems
What we offer:
  • equity
  • company bonus or sales commissions/bonuses
  • 401(k) plan
  • at least 10 paid holidays per year, flex PTO, and parental leave
  • employee assistance program and wellbeing benefits
  • global travel coverage
  • life/AD&D/STD/LTD insurance
  • FSA/HSA and medical, dental, and vision benefits

Additional Information:

Job Posted:
December 06, 2025

Employment Type:
Fulltime
Work Type:
Remote work
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