Senior Machine Learning Engineer

Position Overview

• Location Type: Remote
• Job Type: Contract
• Salary: Not specified

Welltech is a global leader in the Health & Fitness industry, with over 220 million app installs and a mission to improve people's health through intuitive nutrition trackers, fitness solutions, and personalized wellness journeys. We are a diverse team of over 700+ professionals across 5 hubs.

The core ML team is looking for an experienced professional to design and deploy impactful machine learning solutions that enhance decision-making and automate key business processes. This role involves ownership of end-to-end ML systems, from data to deployed models and monitoring.

Requirements

• 4+ years of experience in Machine Learning, Data Science, or ML Engineering.
• Advanced proficiency in Python and SQL.
• Strong experience with ML libraries such as NumPy, Pandas, Scikit-learn.
• Solid knowledge of statistical modeling, machine learning theory, optimization, and practical algorithm design.
• Strong Python coding skills, including writing clean, efficient, and maintainable production code.
• Hands-on experience building, deploying, and maintaining ML models in production.
• Experience with end-to-end ML pipelines: data ingestion, feature engineering, training, validation, deployment, and monitoring.
• Proficiency in AWS services such as SageMaker, Glue, Redshift, and Lambda.
• Familiarity with ML engineering best practices: version control, CI/CD for ML (e.g., model registry, automated testing, retraining pipelines).
• Strong communication and stakeholder management skills.
• Proven ability to lead complex projects and collaborate with cross-functional teams.

Responsibilities

• Lead the design, development, and deployment of robust ML systems.
• Own and evolve core ML infrastructure and pipelines, ensuring scalability and reliability.
• Partner with data engineers and analysts to ensure high data quality and efficient feature pipelines.
• Design and maintain inference APIs in production environments.
• Build internal tools and dashboards using Streamlit to support model transparency and monitoring.
• Track model performance and implement monitoring tools.
• Collaborate with business stakeholders to scope ML use cases and translate them into actionable technical solutions.
• Conduct code reviews, mentor ML Engineers and Data Scientists, and promote best practices.
• Ensure continuous improvement of deployed models through retraining, feedback loops, and error analysis.

Nice to Have

• Experience with recommendation systems.
• Familiarity with reinforcement learning or bandit-based approaches.
• Knowledge of deep learning frameworks (e.g., PyTorch, TensorFlow).
• Familiarity with containerization (Docker).
• Exposure to infrastructure-as-code (Terraform) and workflow orchestration (Airflow).

Tech Stack

• Python
• SQL
• DBT

Company Information

Welltech is a global leader in the Health & Fitness industry, dedicated to improving the health of millions of people worldwide through innovative technology.