Senior ML Engineer - Production-Grade LLM & AI Systems

Box; Wrocław; On-site; PLN 190,000 - 270,000; Full time

Job summary

Box is seeking a Machine Learning Engineer to design, build, and operate reliable ML systems at enterprise scale. You will combine software engineering and applied ML to take solutions from idea through production, collaborating with engineering, product, data, and infrastructure teams.

The Metadata Extraction team enables AI-powered capabilities to transform unstructured content into structured metadata. You will work on OCR, LLM-based extraction, and document understanding, building reliable,

Qualifications

• 3+ years of experience building, deploying, or operating production software, data, or machine learning systems.
• Strong programming skills in Python and production-grade, readable, testable code.
• Experience with LLM-based agents lifecycle: data/eval-set prep, prompting/tools, RAG, evaluation, deployment, monitoring.
• Experience with LLM application frameworks and libraries, such as LangChain, LangGraph, PyTorch, Pydantic, Pandas, or NumPy.

Responsibilities

• Design, build, deploy, and maintain production LLM agents, machine learning models and services.
• Develop robust data preparation pipelines, prompt and tool design, and agentic workflows.
• Write high-quality, maintainable Python code for production systems.
• Partner with Product, Software Engineering, Data, and Infrastructure teams to translate customer and business needs into ML-powered capabilities.
• Evaluate and improve agents quality using appropriate offline and online metrics, eval sets, experiments, and feedback loops.
• Monitor production ML systems for quality, reliability, latency, cost, and data or model drift; investigate and resolve issues as needed.
• Contribute to the architecture of scalable services and pipelines that support real-time and batch ML workloads.
• Create clear technical designs, documentation, tests, and operational runbooks.
• Share knowledge, contribute to engineering best practices, and help raise the bar for code quality and operational excellence.
• Participate in an on-call rotation and help triage production issues when on call.

Skills

Python

Production-grade code

LLM agents lifecycle

Data pipelines

Tools

LangChain

LangGraph

PyTorch

Pydantic

Pandas

NumPy

Job description

Box is seeking a Machine Learning Engineer to design, build, and operate reliable ML systems at enterprise scale. You will combine software engineering and applied ML to take solutions from idea through production, collaborating with engineering, product, data, and infrastructure teams.

The Metadata Extraction team enables AI-powered capabilities to transform unstructured content into structured metadata. You will work on OCR, LLM-based extraction, and document understanding, building reliable,