Senior Machine Learning Engineer

About Us

Hormona is a data-driven women's health company on a mission to revolutionize female health. Our award-winning app and world-first rapid hormone test form the only comprehensive, personalized platform that helps women understand and optimize their hormonal well-being. Hormona's innovative test delivers quantitative hormone results in just 15 minutes, enabling real-time hormone tracking like never before. Combined with cycle tracking, symptom logging, personalized insights, and expert-backed recommendations, Hormona empowers women with instant, data-driven insights to take full control of their hormonal health.

The Role

We're seeking a Senior Machine Learning Engineer / Data Scientist to lead our ML initiatives from ideation to production. You'll design, train, and deploy models that power our at-home hormone test kits, predict symptoms and periods, and personalize the user experience inside our app. You will own the full ML workflow and deliver accurate, explainable, production-ready solutions for women's health.

Key Responsibilities

• Design, train, deploy, and maintain ML models integrated into our mobile app
• Develop and
  train
  computer vision and object detection models for hormone test kits
• Build and
  train
  data-driven predictive models for symptoms, periods, and cycle insights
• Develop LLM applications and RAG pipelines
• Design experiments, validate approaches, and analyze results
• Collaborate with engineering, product, and science teams to translate insights into features
• Establish data pipelines, evaluation frameworks, and production monitoring
• Make pragmatic decisions between experimental approaches and scalable production solutions in a fast-paced startup environment

What You Bring

• 5+ years
  of hands-on experience in machine learning and software development, with models deployed to production
• MSc in Computer Science, Biomedical Data Science, Biostatistics, or related fields
• Strong proficiency in Python (pandas, scikit-learn, FastAPI), SQL, and data warehouse architecture
• Experience
  training computer vision and object detection models
• Experience working with LLM APIs (OpenAI, Gemini, etc.) and building RAG architectures
• Strong statistical foundation and understanding of software design principles for maintainable, scalable code
• Advanced image processing expertise
• Experience with Git, cloud platforms (preferably Google Cloud), and remote-first collaboration
• Fluent English

Who You Are

You're a connector at heart — someone who loves bringing people together and building relationships. You combine creativity with commercial thinking: you can dream up unforgettable community experiences while also finding the partners and sponsors who help make them happen. You're resourceful, proactive, and thrive on creating impact in a way that's both meaningful and cost-efficient.

Not Your Typical 9–5

This isn't a standard job. At Hormona, we're looking for someone with a
unicorn mentality
—creative, adaptable, and energized by challenges. You'll thrive in a fast-moving environment, wear many hats, and help us push boundaries as we shape the future of female health.

What we offer you

A friendly, curious, and international working environment with a small, ambitious team

Flexible working opportunities

Impact the future of the company

Office space in Stockholm

Fun meet-ups with the whole team around Europe

Play a big role in our mission to improve the future of female health

Growth opportunities

Competitive salary with the opportunity for options

Ready to help millions of women take control of their hormones?