July 25, 2024

Full Stack Data Scientist

Boston, MA

  • Full-time


As a Full Stack Data Scientist on the Experiments Platform Team, you can expect to be deeply involved in the technical discussions on how we build actionable experimentation features that enable users to learn about their audience. Full stack data scientists learn the software engineering skills they need to productionalize the data science features they help the team develop. For this role, prior software experience is not required, but a strong interest in learning it is a must. You will work alongside software engineers, product managers and designers to deliver an intuitive and robust experimentation suite for Klaivyo's users. You'll have ownership of projects that contribute to the team's mission, goals, and roadmap while collaborating alongside technical product owners and product managers. Your tech stack will include Python, Scipy, Ax (BoTorch, GPyTorch), CausalML, AWS, Ray, and Spark.


  • Be the data science expert on a full stack engineering team. 
  • Build a platform that enables robust experimentation and optimization for users of all levels of statistical literacy.
  • Test algorithms and techniques on large and small data sets - audience sizes on Klaviyo span approximately seven orders of magnitude
  • Enable testing at scale. More than 60k unique experiments are started via our platform each month.
  • Fully own features from conception through rigorous experimentation to deployment
  • Work cross functionally with product, design, and engineering
  • Have ample opportunities for growth


  • Strong statistical background. Passion for experimental design and presentation of data 
  • 1+ years experience working in a data science or applied probability
  • Proficient in at least one modern programming language
  • Bachelor's or advanced degree in computer science, applied math, statistics or other relevant quantitative discipline, or equivalent industry experience
  • Able to communicate well, work with others, learn continuously, and excited by difficult problems
  • Excited to learn engineering skills and contribute as both a data scientist and an engineer


The pay range for this role is listed below. Sales roles are also eligible for variable compensation and hourly non-exempt roles are eligible for overtime in accordance with applicable law. This role is eligible for benefits, including: medical, dental and vision coverage, health savings accounts, flexible spending accounts, 401(k), flexible paid time off and company-paid holidays and a culture of learning that includes a learning allowance and access to a professional coaching service for all employees.

Base Pay Range For US Locations:

$123,200---$184,800 USD

About Klaviyo

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. Want to learn more about life at Klaviyo? Visit careers.klaviyo.com to see how we empower creators to own their own destiny.