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17 Dec 2015

Full-Time Backend Engineer – 21, Inc – San Francisco, CA

21, Inc. – Posted by Indeed San Francisco, California, United States

Job Description


  • You have a BS/MS/PhD in CS or an allied discipline, or the equivalent in independent work experience
  • You are extremely well-versed in Python/Django (preferred), Ruby/Rails, or a comparable backend stack (eg Node/Express)
  • You know the basic AWS technologies (EC2, S3) and can easily get familiar with new ones
  • You know when to use vanilla Postgres and when to use something like Redis, neo4j, or PostGIS
  • You know how to profile queries and build up SQL queries iteratively
  • You know when to run a simple sqlite on a single local machine and when to scale things out on AWS
  • Bonus: Knowledge of the Bitcoin protocol


  • Help us build and scale the endpoints that will furnish read/write access to millions of clients
  • Log, instrument, profile, and optimize these endpoints
  • Work with our security team to guard endpoints against many different kinds of attack vectors
  • Interface our internal database with the global Blockchain to read and write
  • Scale our data warehouse to store enormous quantities of analytical data


  • Competitive compensation and benefits
  • Generous equity package in a fast-growing startup
  • Catered lunches and dinners plus a fully stocked fridge
  • Gym membership to work off the catered lunches and dinners
  • MacBook Pro, Thunderbolt display, and all the technical books you need


People compare Bitcoin to the Internet. Well, the Internet required an enormous hardware infrastructure buildout before its potential as a software platform could be realized. That’s where we come in. We believe that Bitcoin isn’t going to happen simply by dropping a line of Javascript into a webpage. Someone needs to build the full-stack infrastructure for Bitcoin, from silicon to software. Backed by Andreessen Horowitz and Peter Thiel, that someone is us.

Job Types: Full-Time.

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