MLE by day · builder by night

Tony Kwok

ML by day, building at night

MLE at Spotify. After hours, I tinker on side projects — mostly around how AI is reshaping subscription and freemium businesses, with a soft spot for next-gen AI in healthcare.

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About

Day job, night job.

By day, I'm an MLE at Spotify, working on personalisation and user understanding for subscriptions. By night, I build things — lately I've been obsessed with how AI is going to reshape traditional ML in subscription and freemium businesses (a rabbit hole my day job keeps pushing me down), and with what next-gen AI looks like in healthcare.

London, UK

Experience

Where I've shipped.

Machine Learning Engineer

Spotify

Nov 2025 – Present

Subscriptions R&D — User Understanding.

Machine Learning Engineer

Trainline

Jun 2024 – Nov 2025

Profitable Growth and Customer LTV.

Machine Learning Engineer (Consultant)

Guidehouse

Aug 2023 – May 2024

Digital Twins for Gas Distribution Network.

Applied Data Scientist

Dept. of Medicine, University of Hong Kong

Aug 2021 – May 2022

Image Classification for Orthopaedics.

Skills

The toolkit.

Languages

PythonSQLScala (Scio)Java

ML Frameworks

PyTorchTensorFlow / TFXHuggingFaceXGBoostRay

Data Platforms

GCP (BigQuery, Bigtable, Dataflow)AWS (Athena, EMR)Redis

ML Platforms

DatabricksKubeflowMLflowFeastVertex AINVIDIA Triton

DevOps / Infra

FlyteAirflowJenkinsKubernetesDockerTerraformAWS ECS

Projects

Selected work.

GIT-ARRG-X

x-raydar.info

Contributor to GIT-ARRG-X, a vision-language model for automated chest X-ray report generation built on Generative Image Transformers (GIT). Part of the NHS-backed X-Raydar Project led by Prof. Giovanni Montana at the University of Warwick, improving the clinical quality and coherence of AI-generated radiology reports.

PyTorchVision-LanguageMedical AINLP

Education

Foundations.

2022 – 2023

MSc Statistics

University of Warwick

Distinction
Winton Dissertation Prize Winner

2016 – 2020

BSc Mathematics (Honours)

The Chinese University of Hong Kong

Enrichment Mathematics Scholarship (top nationwide admits)