Senior Machine Learning Engineer I

Signifyd is a company that helps merchants confidently grow their businesses by building trusted relationships with their customers. The Senior Machine Learning Engineer will be responsible for building, maintaining, and monitoring production ML models and frameworks, ensuring robust fraud detection systems and improving model performance.

Responsibilities:

• Expand ML Capabilities – Identify, prototype, and integrate new ML technologies and infrastructure to enhance fraud detection effectiveness and scalability
• Enable High-Velocity Experimentation – Own the design and implementation of ML pipeline components that accelerate our innovation
• Collaborate Across Functions – Partner with Product, Engineering, and Risk teams to translate business requirements into technical solutions and ensure ML initiatives align with customer needs
• Raise the Bar – Foster a culture of technical excellence by championing best practices in testing, documentation, model monitoring, and development

Requirements:

• A degree in Computer Science, Statistics, or a comparable quantitative field
• 4-6+ years of post-undergrad work experience in a production-grade ML environment
• Strong foundation in machine learning theory, statistical evaluation, and experience with supervised/unsupervised learning at scale
• Proven track record of taking ML projects from research/prototype to high-scale production environments
• Ability to communicate technical findings clearly to both technical peers and non-technical stakeholders
• Proficiency in Python, SQL, key ML libraries, and Spark
• A strong outcome-oriented mindset—you care about the 'why' behind the models and the business impact they create
• Previous experience in fraud, fintech, payments, or e-commerce
• Passion for writing well-tested production-grade code
• A Master's Degree or PhD