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Principal Machine Learning Engineer, Matching & Recommendations

Bumble Inc.UK LondonEngineering
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Salary
Not listed
Job type
Full-time
Experience
Principal · 10+ yrs
Posted
7 Oct 2026
Status
Open · checked 7d ago

About this role

This role suits an experienced machine learning professional looking to shape next-generation recommendation systems in London. The Principal Machine Learning Engineer, Matching & Recommendations position at Bumble Inc. in UK London involves leading technical strategy and remaining hands-on to build scalable connection-focused solutions.

Role Overview

Bumble Inc. is hiring a Principal Machine Learning Engineer to focus on matching and recommendations in UK London. The position sits at the intersection of product and engineering, requiring hands-on technical execution alongside strategic leadership for recommendation engines, retrieval systems, and ranking models.

Key Responsibilities

Shape and drive the technical strategy for artificial intelligence and machine learning frameworks that govern personalization, ranking, and matching features.
Build and launch production-ready models via modern frameworks like PyTorch to maintain high reliability and performance.
Construct production AI agents utilizing fine-tuned large language models, foundation models, and associated tool integrations.
Create comprehensive machine learning pipelines incorporating distributed processing and orchestration platforms like Spark and Airflow.
Design and execute robust evaluation methodologies, including A/B testing and offline measurements.
Collaborate alongside engineering, data science, and product teams to translate complex business challenges into scalable technical deliverables.
Coach senior individual contributors to foster an environment of continuous learning and high technical standards.
Champion responsible artificial intelligence guidelines covering data privacy, fairness, transparency, and user safety.

Requirements

Typically brings 10 to 15 years of relevant professional background, or equivalent demonstrated practical impact.
Extensive background in designing, developing, and releasing large-scale machine learning systems into production environments.
Advanced proficiency using Python alongside primary machine learning frameworks such as PyTorch or TensorFlow.
Solid comprehension of recommendation architectures, feature engineering, loss functions, and online versus offline performance metrics.
Practical history working with fine-tuned large language models, prompt engineering, and agentic workflows.
Demonstrated capability in building scalable data pipelines using orchestration tools like Airflow or Spark.
Proven track record of operating as a senior individual contributor who influences organizational strategy without direct authority.

Skills and Tools

Python
PyTorch
TensorFlow
Spark
Airflow
Large Language Models (LLMs)
Recommendation Systems

About the Company

Bumble Inc. operates as the parent organization for Badoo, Bumble Date, and BFF. Founded in 2014, the company focuses on building healthy, equitable relationships and community connections through its various platforms.

How to Apply

Candidates should apply directly on the official Bumble company careers page.

Skills and tech stack

PythonPyTorchTensorFlowSparkAirflowLLMsNLPMachine LearningFine-tuning

Questions candidates ask

Where is the Principal Machine Learning Engineer position located?

The role is based in London, United Kingdom.

What level of experience is required for this job?

The posting typically looks for candidates with 10 to 15 years of relevant background, or equivalent demonstrated impact.

What core technologies and frameworks are used in this role?

The tech stack includes Python, PyTorch, TensorFlow, Spark, Airflow, and large language models.

How should I submit my application?

Applications should be submitted through the official Bumble company careers page.

Ready to apply?

The application is on the official Bumble Inc. careers page.

Apply on company site