Senior Machine Learning Engineer
Offer summary

(Summary generated by AI based on the full job description)

The project focuses on recommendation systems for personalized fitness and wellness content used by millions globally. Key technologies include Python, Spark, Airflow, AWS, Kubernetes, Deep Learning, Transformers, LLMs, MLOps. Responsibilities cover building, training, and deploying ML models, developing data pipelines, enhancing scalability and performance of recommendation services, and conducting A/B testing. Collaboration with ML engineers, platform teams, and analysts is essential. Benefits include full medical care, Multisport card, and remote work allowance.

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Senior Machine Learning Engineer

Company: Motife Sp. z o.o.

from: 8 June 2026
to: 8 July 2026
31 000 - 35 000gross/ mth.contract of employment (full-time)
Salary details
basic salary
Offer parameters
level:senior
working mode:hybrid
Warszawa, Wola
Warszawa, WolaGrzybowska 60View on map

Requirements

Expected technologies

Python
Spark
Airflow
AWS
Kubernetes

Optional technologies

Java
Kotlin
Go
C
C++

Operating system

macOS

Our requirements

  • 4+ years of experience in machine learning, ideally in recommender systems, NLP, computer vision, or another applied ML domain.
  • Degree in Computer Science, Machine Learning, Statistics, Mathematics, Operational Research, or another quantitative field.
  • Strong hands-on experience building, training, evaluating, and improving ML models.
  • Solid software engineering skills, including clean code, data structures, algorithms, and production readiness.
  • Professional experience with Python; experience with Java, Kotlin, Go, C, or C++ is a plus.
  • Experience with large-scale data pipelines, distributed processing, and orchestration tools such as Spark and Airflow.
  • Familiarity with cloud-based ML environments, preferably AWS, and production serving technologies such as Kubernetes, REST, gRPC, or FastAPI.
  • Strong communication skills and the ability to work cross-functionally with product, analytics, platform, data, and engineering teams.

Your responsibilities

  • Build, train, evaluate, and improve ML models powering personalized workout and content recommendations.
  • Develop and maintain data and ML pipelines using Python, Spark, Airflow, AWS, and S3.
  • Productionize, deploy, monitor, and optimize ML models and recommendation services.
  • Improve real-time model serving, including latency, scalability, reliability, and infrastructure costs.
  • Support the evolution of recommendation systems toward unified rankers, candidate generation, and inference services.
  • Run A/B tests and analyze experiment results with Product Analysts to measure product and member impact.
  • Contribute to IQ initiatives, including personalized plans, insights, LLM-based features, and responsible AI practices.
  • Collaborate with ML Engineers, Data Engineers, Software Engineers, Platform Engineers, Product Managers, and Analysts to deliver scalable personalization features.

About the project

We are hiring on behalf of our client, a global innovator in fitness and wellness technology. Their mission is to empower people to live fit, strong, long, and happy lives by delivering integrated experiences to millions of members anytime, anywhere.
We are looking for a Senior Machine Learning Engineer to join the Personalization team, which owns the recommendation systems powering content discovery across the ecosystem. In this role, you will work on end-to-end ML systems: building and training models, improving real-time recommendation services, running experiments, and deploying scalable solutions into production. You will help evolve the recommendation platform from multiple models toward a more unified, real-time architecture, while also contributing to company's IQ initiatives involving LLMs, personalized plans, and AI-powered member experiences.
Key takeaways:
Stack: Python, Spark, Airflow, AWS, S3, Kubernetes, recommender systems, Deep Learning, Transformers, LLMs, MLOps, REST/gRPC/FastAPI, A/B testing

This is how we organize our work

This is how we work

in houseyou have influence on the technological solutions appliedyou have influence on the productyou focus on product developmentagile

This is how we work on a project

  • Clean Code
  • TDD
  • Continuous Deployment
  • Continuous Integration
  • DevOps
If this sounds like your next step, we’d love to hear from you! Please apply via our careers page and submit your CV in English.
Company

What we offer

  • 100% paid medical care
  • Multisport
  • Creative tax (KUP)
  • Home office allowance
  • MacBook Pro

Recruitment stages

  • 1.
    A call with MOTIFE Recruiter
  • 2.
    Hiring Manager screening
  • 3.
    Coding interview
  • 4.
    Panel interviews with the team
Senior Machine Learning Engineer
31k–35k zł / mth. (CoE)
I apply to:
Motife Sp. z o.o.
Warszawa, Wola
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