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Senior Machine Learning Engineer

Warszawa, mazowieckie💼 Full-time💰 $31–$31🗓 2026-05-30 → 2026-08-10

Core

Building and training ML models for personalized workout and content recommendations in a fitness and wellness ecosystem.

Role type

Senior Machine Learning Engineer (Recommender Systems)

Builds

Real-time recommendation services, personalized plans, and AI-powered member experiences.

Domain

Fitness and wellness technology

Deliverable

production ML models

Required skills

Python, Spark, Airflow, AWS, S3, Kubernetes, Deep Learning, Transformers, LLMs, MLOps, REST/gRPC/FastAPI, A/B testing

Preferred skills

Java, Kotlin, Go, C, C++

Technologies

Python, Spark, Airflow, AWS, S3, Kubernetes, Transformers, FastAPI

Responsibilities

Build, train, evaluate, and improve ML models for personalized recommendations; Develop and maintain data and ML pipelines; Productionize, deploy, monitor, and optimize ML models; Improve real-time model serving latency and scalability; Support evolution toward unified rankers and inference services; Run A/B tests and analyze experiment results; Contribute to IQ initiatives including LLM-based features.

Seniority

Senior, hands-on IC

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