Machine Learning Engineer - Ads Conversion Modeling

reddit; London; On-site; GBP 70,000 - 90,000; Full time

Job summary

A leading social media platform based in London is seeking a Machine Learning Engineer to join their Ads Conversion Modeling Team. The role involves building advanced machine learning models to optimize advertising effectiveness. Candidates should have significant experience with ML frameworks like Tensorflow and Pytorch. The company offers a supportive work culture, professional development funds, and a range of benefits.

Benefits

Pension Scheme

Private Medical and Dental Scheme

Flexible Vacation

Commuter Benefits

Qualifications

• 3+ years of experience with industry-level Machine Learning models.
• Experience with mainstream ML frameworks such as Tensorflow and Pytorch.
• End-to-end experience of training, evaluating, testing, and deploying models.

Responsibilities

• Building industrial-level models for critical ML tasks.
• Researching and implementing new model architectures.
• Contributing to team strategy and planning.

Skills

Machine Learning models

Tensorflow

Pytorch

Deep learning

Feature engineering

Job description

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Machine Learning Engineer - Ads Conversion Modeling, London

Client: reddit

Location: London, United Kingdom

Job Category: Other

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EU work permit required: Yes

Job Reference: fc21dcf72dc2

Job Views: 23

Posted: 12.08.2025

Expiry Date: 26.09.2025

Job Description:

Reddit is a community of communities. It’s built on shared interests, passion, and trust and is home to the most open and authentic conversations on the internet. Every day, Reddit users submit, vote, and comment on the topics they care most about. With ,+ active communities and approximately M+ daily active unique visitors, Reddit is one of the internet’s largest sources of information. For more information, visit .

As a company, Reddit primarily generates revenue through advertising, and we're working towards building a massive business to fund our mission. We distinguish ourselves from other digital ad platforms by attracting advertisers who want to connect with a specific target audience because of our passionate and engaged communities.

The Ads Conversions Modeling Team is entrusted with the development and maintenance of a diverse set of Machine Learning models that are responsible for predictions regarding user conversions after engaging with Reddit. The creation and enhancement of these models plays a crucial role in our organization's efforts to optimize advertising effectiveness and drive business growth. We are looking for a motivated engineer that will help us advance our vision. As a diverse group of software engineers, product managers, data scientists, and ads experts, we are excited for you to join our team!

As a machine learning engineer in the Ads Conversion Modeling Team, you will research, formulate, and execute projects, and actively participate in the end-to-end implementation process. You will collaborate with cross-functional teams to ensure successful product delivery. You will also be able to contribute your expertise and shape the future of ads ML at Reddit!

Your Responsibilities:

• Building industrial-level models for critical ML tasks with advanced modeling architectures and techniques
• Research, implement, test, and launch new model architectures including deep neural networks with advanced pooling and feature interaction architectures
• Systematic feature engineering works to convert all kinds of raw data in Reddit (dense & sparse, behavior & content, etc) into features with various FE technologies such as aggregation, embedding, sub-models, etc.
• Contribute meaningfully to team strategy. We give everyone a seat at the table and encourage active participation in planning for the future

Who You Might Be:

• Tracking records of consistently driving KPI wins through systematic works around model architecture and feature engineering
• + years of experience with industry-level Machine Learning models
• + years of experience with mainstream ML frameworks (such as Tensorflow and Pytorch)
• + years of end-to-end experience of training, evaluating, testing, and deploying industry-level models
• Deep learning experience is a strong plus
• Experience in orchestrating complicated data generation pipelines on large-scale dataset is a plus
• Experience with Ads domain is a plus
• Experience with Recommendation Systems is a plus

Benefits:

• Pension Scheme
• Private Medical and Dental Scheme
• Life Assurance, Income Protection
• Workspace benefit for your home office
• Personal & Professional development funds
• Family Planning Support
• Commuter Benefits
• Flexible Vacation & Reddit Global Days Off

Join us at Reddit, and help us build a community that is inclusive and empowering for everyone.