Senior Data Scientist

Posting Open Date: Oct. 7 2025

Anticipated Posting Close Date*:Nov. 6 2025

*Job posting may close early due to the volume of applicants.

Senior Data Scientist

Join our high impact Analytics team as a Senior Data Scientist where youll shape the future of data-driven this role youll deliver actionable deep insights to solve critical business challenges. Over time youll transition into more advanced data science work such as predictive modeling and machine learning to unlock even greater value. As a senior member on the team youll mentor colleagues set best practices and elevate how we use data to drive success. This is your opportunity to make a meaningful impact while growing in a collaborative and innovative environment.

What Youll Do:

• Lead end-to-end data science and AI projects from problem definition and data collection to model deployment and business implementation
• Design develop and optimize machine learning and generative AI models to solve complex business problems and drive measurable outcomes
• Integrate AI capabilities into existing products and workflows to enhance functionality and create new value opportunities
• Collaborate with engineering product and business teams to identify opportunities where data science and advanced AI can create significant impact
• Communicate insights and recommendations to technical and non-technical stakeholders through compelling visualizations and presentations
• Mentor junior team members and establish best practices for the teams AI approaches and methodologies

What Were Looking For (Required):

• Significant professional experience in a related technical or ecommerce field applying data science and AI techniques to solve diverse business problems - Most Senior level folks at Fastly have at least 5 years of related experience.
• Demonstrated expertise building tools to support complex and highly impactful quantitative analysis of broad operational business questions.
• Demonstrated experience as a technical leader - leading full lifecycle initiatives driving long term roadmaps collaborating with cross-functional stakeholders influencing best practices mentoring team members etc.
• Strong programming skills in SQL and Python and experience with data science and AI libraries (PyTorch TensorFlow scikit-learn Hugging Face)
• Expertise in statistical analysis machine learning algorithms experimentation methodologies large language models and generative AI frameworks
• Experience mentoring and leading others in data science skills and initiatives
• Experience working with modern data stacks including Airflow Fivetran dbt BigQuery Vertex AI and Looker

Well be super impressed if you have experience in one or more of these:

• Masters or PhD in Computer Science Statistics Mathematics or a related quantitative field
• Related CDN industry experience
• Experience in small to mid-size organizations where you have hands on experience and decision making input on building and expanding the data ecosystem
• Experience deploying and maintaining production machine learning systems
• Experience with specialized data types such as natural language time-series or recommendation systems
• Implementing and fine-tuning large language models or other generative AI systems for specific business applications
• Building AI-powered products or features that have been successfully deployed to end users
• Experience with prompt engineering and RAG systems
• Contributions to open-source AI projects or research publications in machine learning or generative AI
• Proficiency with AI services on cloud platforms (AWS Bedrock GCP Vertex AI Azure OpenAI)
  
  

Work Hours:

• This position will require you to be available during core business hours and participate in an on-call rotation.

Work Location(s) & Travel Requirements:

This position is open to the following preferred office location:

• San Francisco CA

Fastly currently embraces a largely hybrid model for most roles which allows employees flexibility to split their time between the office and home.

SF / LA Fair Chance Ordinance Statement

Pursuant to the San Francisco Fair Chance Ordinance and the Los Angeles Fair Chance Initiative for Hiring Ordinance we will consider for employment qualified applicants with arrest and conviction records.

Salary:

The estimated salary range for this position is $155370 to $186444

Starting salary may vary based on permissible non-discriminatory factors such as experience skills qualifications and location.

This role may be eligible to participate in Fastlys equity and discretionary bonus programs.

Benefits:

We care about you. Fastly works hard to create a positive environment for our employees and we think your life outside of work is important too. We support our teams with great benefits that start on the first day of your employment with Fastly. Curious about our offerings

We offer a comprehensive benefits package including medical dental and vision insurance. Family planning mental health support along with Employee Assistance Program Insurance (Life Disability and Accident) a Flexible Vacation policy and up to 18 days of accrued paid sick leave are there to help support our employees. We also offer 401(k) (including company match) and an Employee Stock Purchase Program. For 2025 we offer 11 paid local holidays 11 paid company wellness days.