Senior Member of Technical Staff - Data Science

Castlight Health San Francisco, CA
Help us bring the U.S. healthcare system into the 21st century and shed light on what is an opaque and un-navigable experience for most Americans. We're looking for software engineers to improve the predictive pricing engine powering Castlight's cost estimation tools and infer information about the quality of doctors. Our goal is to help our users understand their healthcare options, predict how much medical procedures are likely to cost them and choose the best quality providers.


Design and build the predictive algorithms and data pipelines that power Castlight's medical cost estimation tools. Derive accurate insights out of billions of medical claims and terabytes of rich healthcare data.

Improve the performance and scalability of our predictive pricing engine. Develop a robust data infrastructure to manage our batch workloads, and identify potential improvements to our technical stack.

Tackle difficult problems in an incredibly complex domain, and modernize the healthcare experience for millions of people.

Mine billions of healthcare claims for information that will help us steer users to the best quality doctors.


5+ years of programming experience

Bachelor's in Computer Science or related field (MS or PhD preferred)

Strong experience with a dynamic language, such as Python or Ruby, or OOP with Java or C++

Solid CS fundamentals; understanding of scaling and performance tradeoffs when dealing with large data sets

Experience with relational databases

Ability to perform independent research and analysis of complex data sets and communicate insights derived from this research to other stakeholders


Experience with MPP databases (e.g., Greenplum, Redshift) or distributed data processing frameworks (e.g., Spark)

Exposure to machine learning and statistical methods

Our Values

One team. On a mission. Making things happen.

About Castlight

Castlight is on a mission to make it as easy as humanly possible to navigate healthcare and live happier, healthier, more productive lives. Our health navigation platform connects with hundreds of health vendors, benefits resources, and plan designs, giving rise to the world's first comprehensive app for all health needs. We guide individuals—based on their unique profile—to the best resources available to them, whether they are healthy, chronically ill, or actively seeking medical care. In doing so, we help companies regain control over rising healthcare costs and get more value from their benefits investments. Castlight revolutionized the healthcare sector with the introduction of data-driven price transparency tools in 2008 and the first consumer-grade wellbeing platform in 2012. Today, Castlight serves as the health navigation platform for millions of people and is a trusted partner to many of the largest employers in the world. We are headquartered in San Francisco, and can be found online at and on the New York Stock Exchange as CSLT.