ML / LLM Application Engineer

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Team Overview

We are looking for a ML / LLM Application Engineer to join our AI team and build production ready applications powered by large language models (LLMs). This is a hybrid position and involves regular performance of job responsibilities virtually as well as in-person at an assigned TU office location for a minimum of two days a week.

Role Overview And Core Responsibilities

This role is focused on LLM application development, agent orchestration, and system integration, rather than deep ML research or training models from scratch. You will own end to end delivery of LLM driven features-from design and prototyping to deployment, monitoring, and optimization-working closely with product, platform, and data teams.

Responsibilities

• Design, build, and deploy LLM-powered applications using LangChain, LangGraph, and related tooling.
• Maintain modular, scalable agent workflows for multi-step reasoning, planning, and tool execution.
• Implement and own RAG pipelines, including data ingestion, chunking strategies, embedding workflows, and contextual retrieval.
• Develop effective prompting strategies, tool calling logic, memory handling, and guardrails to ensure reliable system behavior.
• Integrate LLM applications with vector databases to enable semantic search and contextual intelligence.
• Own production considerations such as latency, cost optimization, reliability, and observability.
• Collaborate with product, platform, and data teams to translate business requirements into robust AI solutions.
• Contribute to architectural decisions, engineering best practices, and reusable patterns for LLM-based systems.

Required Knowledge And Experiences

Required Qualifications

• 2+ years of experience building production software, with a strong focus on AI-powered or LLM-based applications.
• Strong proficiency in Python for building APIs, backend services, AI workflows and maintaining ML pipelines and services.
• Solid understanding of machine learning fundamentals, including supervised and unsupervised learning, model evaluation, and feature engineering.
• Hands-on experience with at least one machine learning framework or library (e.g., scikit-learn, PyTorch, TensorFlow).
• Hands-on experience developing LLM applications using frameworks such as LangChain and/or LangGraph.
• Solid understanding of LLM and NLP fundamentals, including embeddings, transformers, vector similarity search, and prompt design.
• Practical experience implementing retrieval-augmented generation (RAG) systems.
• Experience integrating vector databases (e.g., FAISS, Pinecone, Weaviate, or similar).
• Experience deploying and operating production systems, including Docker, REST APIs, and CI/CD pipelines.
• Strong problem-solving skills and ability to independently own features while collaborating across teams.

Good to Have

• Experience working with cloud platforms such as AWS, Azure, or Google Cloud.
• Familiarity with distributed systems, async processing, or microservice architectures.
• Exposure to MLOps practices, including model evaluation, experiment tracking, monitoring, and rollback strategies.
• Experience handling largescale structured and unstructured data.
• Exposure to multimodal LLM applications (text + image, audio, or video).

Familiarity with lightweight model adaptation techniques (e.g., inference optimization, prompt tuning, LoRA) is a plus.

TransUnion Overview:

At TransUnion, we encourage and are committed to creating a real, positive impact and shared sense of purpose within our Workforce for Good, which empowers our people to grow, innovate and contribute to a better future for our communities and customers. We strive to build an environment where our associates are in the driver s seat of their professional development- while having access to help along the way. We recognize that success comes when our associates thrive both professionally and personally; that s why we prioritize work/life flexibility and offer resources for our teams across the globe to collaborate and drive excellence.

Be a part of our Workforce for Good - you ll work with great people, pioneering products and cutting-edge technology.

TransUnion Job Title

Analyst, Applications Development