San Francisco, CA Mixpanel (YCS09; <a href="http://mixpanel.com" >) is the most advanced advanced analytics platform ever for web &amp; mobile applications.
Mixpanel is profitable, with thousands of customers and millions in monthly revenue.
ENGINEERING CULTURE
Our engineering culture:
  * We do very thorough, line-by-line code reviews using GitHub pull requests. This keeps our code quality high and helps us learn.
  * We try to have two people work together on every project (collaborating, not pairing). It's more fun and it results in better code.
  * We practice rapid iteration. If it's better than live, we ship. We also build things so they can go live (whitelisted) long before launch day.
  * We write tests for things that are mission-critical, prone to failure, or cause paranoia. Think billing and datastore code, not Django views.
  * We care about learning. Right now we're reading through Advanced Programming in the Unix Environment.
  * We currently have 9 vim users, 2 IntelliJ, and 1 emacs holdout.

ENGINEERING POSITIONS
We have two types of engineering positions available - systems and product. Both of these positions require you to be able to work in San Francisco, CA.
Systems engineers build and scale our infrastructure, and write mostly C, C++, and Python. We are working on a number of new products right now with serious infrastructure challenges and we need more people with great depth to help us solve them. This position requires at least 5 years of experience.
Responsibilities of this role include:
  * Working on our custom datastore (written from the ground up in C)
  * Scaling the data processing pipeline (currently handling  50K requests per second)
  * Building notification delivery infrastructure (currently sending  100M emails &amp; push notifications per month)
  * General improvements to performance, reliability, and security
  * Work with the rest of the engineering team to design, build, deploy, and maintain systems

If you're interested in a more full-stack role, check out the Product engineer position: <a href="http://boards.greenhouse.io/mixpanel/jobs/7910" >
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The engineering team is still small (14), and there's a lot of interesting stuff to do. Happy to talk details.
If you're interested, drop me a line - REDACTED_EMAIL.
Ask HN: Who is hiring? (September 2014)