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Open nowPosted 24 days ago

Senior Machine Learning Engineer

thisisglobal22 open roles

Where
Holborn - London
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Your applicationOpen nowSenior Machine Learning Engineerthisisglobal · Holborn - London

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The clock on this job

Early applications get read.

13.4% of postings close within 7 days. Measured by our own scanner across the market. thisisglobal postings stay open a median of 14 days.

Share of postings closed within
  1. 2.2%1 day
  2. 4.6%3 days
  3. 13.4%7 days
  4. 21.6%14 days
  5. 36.2%30 days
  6. 59.0%60 days
This job: posted 24 days ago

thisisglobal median: 14 days open

The posting

Accepting applications until:

13 November 2026

Job Description

Your New Role: Senior Machine Learning Engineer

Global’s Data team is looking for a Senior Machine Learning Engineer to build, deploy and scale machine learning solutions—turning data science ideas into robust, production-grade products.

As a Senior Machine Learning Engineer at Global, you’ll support use cases across DAX, our digital ad exchange—such as the cross-device audience identity graph and real-time targeting algorithms. You’ll join a high-performing, cross-functional DAX squad of data engineers, product specialists and analytics experts, helping build and evolve our cutting-edge ad-serving technology for audio and Outdoor. This is a hybrid role based at our Holborn office in central London.

Key Responsibilities

  • Model Development & Optimisation: Design, build and optimise ML and deep-learning models—including for ad targeting and attribution—with a focus on scalability, performance and accuracy, and prototype and evaluate new approaches.
  • ML Pipelines & Real-Time Inference: Build and maintain robust end-to-end ML pipelines covering training, validation, deployment and monitoring, and develop real-time inference systems with low latency and high throughput.
  • Monitoring & Reliability: Implement model monitoring, drift detection, alerting and retraining, and optimise models for reliability and cost efficiency in AWS.
  • Collaboration & Enablement: Partner with data engineers to integrate ML workflows into wider platforms (Spark, Databricks), and share best practice and mentor other technical professionals.

What You’ll Love About This Role

  • Think Big: Build ML and AI solutions that shape products, improve decision-making and unlock growth.
  • Own It: Take ideas from concept to production and see the impact of your work in the real world.
  • Keep it Simple: Turn complex technical challenges into scalable, practical solutions.
  • Better Together: Work with smart, supportive people across data, engineering, analytics and the wider business.

What Success Looks Like

In your first few months, you’ll have:

  • Built ML products that deliver measurable value, improving Global’s capabilities in areas such as ad targeting and attribution.
  • Ensured ML models are reliably deployed, monitored and maintained, with automated, reproducible and scalable pipelines.
  • Built real-time systems that operate efficiently and reliably under production demand.
  • Developed a strong understanding of Global’s data ecosystem, tools and operating model, particularly within DAX.

What You’ll Need

  • Production ML experience: You’ve delivered ML and deep-learning projects at high data volume commercially, owning deployment, CI/CD, monitoring and lifecycle management.
  • Strong Python: Solid Python with PyTorch or similar ML frameworks.
  • Model evaluation: You diagnose why models underperform across data, features and architecture, and make reasoned trade-offs.
  • Real-time & distributed ML: A strong grasp of production inference patterns, plus Spark and distributed data processing.
  • Reproducibility & tooling: Reproducible environments (UV/Docker) and MLflow or equivalent, on AWS with Spark, Databricks and Snowflake.
  • Engineering mindset: A focus on reliability, maintainability and continuous improvement.
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