11 - 25 Employees
< 10 Engineers
$5M - $10M Funding
Pre-Series A

For thousands of years, astrology has functioned as a ritual, a language, and social glue. Co-Star is bringing this ancient practice into the 21st century with a social, personalized experience that helps people reflect and connect in real, meaningful ways. Understanding that astrology is about more than predicting the future, we approach it as part of $4.3tr wellness industry.

Active Roles
Why join us?
  • Our user base is growing exponentially.

  • Over half of millennials and nearly a third of American adults believe in astrology.

  • Investors include people behind companies like Everlane, Vine, Warby Parker, Glossier, Outdoor Voices, Away, etc. Last year we were worth $5m. Now we're worth $30m.

Engineering at co-star
Engineering team and processes

We’re big into cross-functional collaboration. Monthly, the entire company comes together to brainstorm new ways to hit our goals. We believe we can move the fastest when there is open communication between all members of the team (product designers, engineers, content, customer support, etc)

Weekly, we start the week with an iteration planning meeting to estimate and scope stories. We use GitLab to do code reviews.

Technical Challenges

• Scaling our backend infrastructure to millions of daily users • Space geometry - we calculate horoscopes based on angles between different planets/asteroids in the solar system. • Transforming structured data into unique, personalized horoscopes for each specific time/date of birth using a custom domain specific language for constructing formulas based on astrological inputs.

Projects you might work on
  • • Our primary focus of engineering is our mobile app. One example of a recent project was adding related friends to people's daily updates. This involved changes across the whole stack, including thinking about permissions, custom views, performance testing, and backwards compatibility.

  • • We develop internal tools to give our content editors super powers. Part of this includes a DSL which can be interacted with via a visual editor.

Tech stack
AWS Lambda

Working at co-star
Generous Vacation

Unlimited vaca, 4 week minimum.

Free Food


Flexible Hours
Health Insurance
Work from Home
Beautiful Office

Interested in this company?
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