Sr Software Engineer II, AI

About the role

We require people to be on-site, 4 days/week at our Denver or NYC office and are unable to offer relocation support.

Job Summary

LG Ads is seeking a motivated AI Platform Engineer to join our AI team and help build the in-house platform powering generative AI agents deployed business wide.

You'll contribute to the end to end stack; LLM serving and inference, RAG pipelines, evaluation harnesses and the APIs and infrastructure that put agents in production driving efficiency, unlocking new revenue streams and enabling self-service data capabilities across the organization.

The role is hands-on: you'll write production Python, integrate with services like AWS Bedrock and vector stores, instrument systems for observability and tune for latency, throughput and cost.

We're looking for someone with a foundation in platform engineering and a working understanding of intent detection, query decomposition and context engineering, who is comfortable with agile delivery and can thrive in an ambiguous, fast-paced environment.

Responsibilities

• Build and maintain LLM-powered services and APIs (FastAPI, webhooks, LangGraph), translating prototypes into production-ready endpoints with proper error handling, retries and timeouts.
• Develop evaluation harnesses and offline/online eval pipelines to measure quality regressions, hallucination rates and task specific accuracy as models and prompts evolve.
• Instrument services with logging, tracing, and metrics (latency percentiles, token usage, error rates) so production behavior is observable and debuggable.
• Design and develop intelligent AI agents capable of intent recognition and decomposing complex queries into smaller, executable tasks that run in sequence or parallel.
• Implement and optimize context engineering techniques to ensure agents leverage relevant short and long-term memory, as well as our aggregated knowledge base, for accurate and insightful responses.
• Integrate AI agents with internal systems such as ACR, Mosaic, and Salesforce, and third-party services like SpringServe and DSPs.
• Utilize and contribute to the development of standardized tooling protocols to streamline integration and maintenance of AI agents.
• Collaborate with cross-functional teams, including product, and business units, to identify and build AI solutions that span the entire company.
• Develop and implement solutions for operational efficiencies, such as automating media planning and integrating agents into Mosaic (Home Grown DSP).
• Build client-facing tools for voice and natural language data queries, supporting custom data and contributing to data monetization efforts for the ACR platform.
• Automate repetitive tasks in General & Administrative (G&A) functions, starting with Finance, and expanding to HR and IT Operations.
• Enable self-service data access and analysis using AI agents, supporting diverse data sources.
• Participate in agile development sprints, actively contributing to planning, execution, and review.
• Manage ambiguity and adapt to evolving requirements in a rapidly developing AI landscape.

Required Skills and Qualifications

• Proven experience in designing and developing Generative AI agents.
• Strong expertise in intent detection and complex query decomposition.
• Demonstrated experience with context engineering for AI models.
• Proven understanding of knowledge graphs and/or vectorization as it relates to LLMs
• Experience building RAG systems including low level design and implementation of such systems.
• Solid understanding of large language models (LLMs) and their application in enterprise solutions, including foundational models like Llama 4 Maverick, Claude, and OpenAI.
• Experience with cloud platforms, particularly AWS, for scalable compute and storage resources.
• Familiarity with Databricks for processing structured and unstructured data, and its use as a runtime for agents and MCPs.
• Experience working in an agile development environment.
• Experience in Databricks / Snowflake and all the associated AI components
• Experience in AWS (or the two other big clouds) and the associated AI Services

Education

• Bachelor's or Master's degree in Computer Science, Artificial Intelligence, Machine Learning, or a related quantitative field.

Application Deadline: December 31, 2026

Compensation & Benefits

• Tier 1* (San Francisco Bay Area, New York City Tri-State Area, Los Angeles Metro Area, and Seattle Metro Area)$185,000 - $264,000/year
• Tier 2* (all other U.S. Locations outside of Tier 1) $162,000 - $231,000/yr
• Offers Bonus
• Benefits & Perks: 100% employer-paid medical, dental, and vision coverage for employees and eligible dependents. Company-paid life and AD&D, STD and LTD insurance, plus optional supplemental coverage. 401(k) with company match. Flexible Time Off (FTO). Paid parental leave.

*Certain markets, including the San Francisco Bay Area, New York City Tri-State Area, Los Angeles Metro Area, and Seattle Metro Area, are aligned to Tier 1 compensation bands. All other U.S. locations -including Denver - are aligned to Tier 2 compensation bands. The compensation offered will take into account internal equity and may vary depending on the candidate's geographic region, job-related knowledge, skills, and experience.