# Principal Machine Learning Engineer

**Company**: Microsoft
**Location**: Mountain View
**Work arrangement**: hybrid
**Experience**: staff
**Job type**: full-time
**Salary**: $139,900 - $274,800 per year
**Category**: Engineering
**Industry**: Technology
**Ticker**: MSFT
**Wikidata**: https://www.wikidata.org/wiki/Q2283

**Apply**: https://microsoft.ai/job/principal-machine-learning-engineer-6/
**Canonical**: https://yubhub.co/jobs/job_de15c74c-c71

## Description

As a Principal Machine Learning Engineer, you will work on the Data Labeling and classification on large scale multi modal Copilot data part of the Microsoft AI (MAI) organization.

We’re looking for a hands-on ML engineer to prototype and productionize complex classification flows on real production logs, operate prompted classifiers at scale (ad hoc and scheduled), and build secure, compliant data-labeling pipelines.

We’re looking for someone with experience in data pipelines, data science, and machine learning, as well as a strong communicator and great teammate.

The right candidate takes the initiative and enjoys building world-class consumer experiences and products in a fast-paced environment.

Microsoft’s mission is to empower every person and every organization on the planet to achieve more.

As employees we come together with a growth mindset, innovate to empower others, and collaborate to realize our shared goals.

Each day we build on our values of respect, integrity, and accountability to create a culture of inclusion where everyone can thrive at work and beyond

Starting January 26, 2026, MAI employees are expected to work from a designated Microsoft office at least four days a week if they live within 50 miles (U.S.) or 25 miles (non-U.S., country-specific) of that location.

This expectation is subject to local law and may vary by jurisdiction.

Responsibilities:

Build evaluation loops (precision/recall, calibration, drift, human-in-the-loop) and publish dashboards/SLOs.

Generalize machine learning (ML) solutions into repeatable frameworks.

Operationalize prompted classifiers at scale (batch & streaming), including orchestration, autoscaling, monitoring, and cost guardrails.

Conduct thorough review of data analysis and techniques used to summarize the process review and highlight areas that have been missed or need re-examining.

Collaborate cross-functionally with DS, Security, and Platform to define schemas, access patterns, and governance.

Independently write efficient, readable, extensible code and model pipelines.

Commit to a customer-oriented focus by acknowledging customer needs and perspectives, validating customer perspectives, focusing on broader customer context, and serving as a trusted advisor.

Qualifications:

Required Qualifications:

Bachelor’s Degree in Computer Science or related technical field AND 6+ years technical engineering experience with coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, or Python OR equivalent experience.

Preferred Qualifications:

7+ years’ experience writing production-quality Python or Java or Scala code.

5+ years’ experience in distributed systems design and implementation of large scale data processing systems

3+ years’ experience building ML data pipelines using atleast one of AML, Promptflow, Langchain or LangGraph

Demonstrated interest in Responsible AI.

Experience prompting, evaluating, and working with large language models.

#MicrosoftAI #mai-datainsights #mai-datainsights

## Skills

### Required
- C
- C++
- C#
- Java
- JavaScript
- Python
- Data pipelines
- Data science
- Machine learning
- Distributed systems
- Large scale data processing systems
- AML
- Promptflow
- Langchain
- LangGraph
- Responsible AI
- Large language models