docs: add reaction-commerce.md and add Reaction Commerce to README.md (#452)

README.md

@@ -278,6 +278,7 @@ Name | Website | Region
 [Puppet](/company-profiles/puppet.md) | https://puppet.com/ | Worldwide
 [Rackspace](/company-profiles/rackspace.md) | https://rackspace.com/ | Worldwide
 [Rainforest QA](/company-profiles/rainforest-qa.md) ⚠️️ | https://www.rainforestqa.com/jobs/ |
+[Reaction Commerce](/company-profiles/reaction-commerce.md) | https://reactioncommerce.com/careers/ | Worldwide
 [ReactiveOps, Inc.](/company-profiles/reactiveops.md) | https://www.reactiveops.com | USA
 [RealHQ](/company-profiles/realhq.md) ⚠️️ | https://realhq.com/ |
 [RebelMouse](/company-profiles/rebelmouse.md) ⚠️️ | https://www.rebelmouse.com/ |

company-profiles/reaction-commerce.md

@@ -0,0 +1,36 @@
+# Reaction Commerce
+
+## Company blurb
+
+[Reaction Commerce](http://reactioncommerce.com/) is the most popular open source, real-time platform that combines the flexibility developers and designers want with the stability and support businesses need. Find us on [GitHub](https://github.com/reactioncommerce/), [Gitter](https://gitter.im/reactioncommerce/reaction), [Twitter](https://twitter.com/getreaction) and [Instagram](https://www.instagram.com/reactioncommerce/).
+
+## Company size
+
+20 and growing
+
+## Remote status
+
+All employees have a choice to work remotely or in the office, or a combination of both. The team meets in person at least once a year, paid for by the company, for an All Hands week in Santa Monica. Company meetings are always conducted over Zoom video, recorded for all to view later and documented with notes in a company-wide Google Team Drive.
+
+We've written about what we've learned in [managing remote teams](https://blog.reactioncommerce.com/lessons-learned-managing-remote-teams/), our daily practice of [pair programming](https://blog.reactioncommerce.com/why-we-pair-program-every-day/), and published our [company manifesto](https://blog.reactioncommerce.com/our-team-manifesto/). Other parts of our culture and policies: we have a [minimum vacation policy](https://blog.reactioncommerce.com/why-were-opting-for-a-minimum-vacation-policy/), [2-3 months of parental leave](https://blog.reactioncommerce.com/new-parent-leave-benefits-everyone/) and a learning stipend.
+
+## Region
+
+Worldwide - The team is distributed around the world, with headquarters in Santa Monica, CA and coworkers in all time zones of the continental United States, Nigeria, Philippines, India and Thailand.
+
+## Company technologies
+
+- Front-end: JavaScript, React, Next.js, ESLint
+- Back-end: GraphQL, MongoDB, Meteor
+- Dev Ops: Docker, CircleCI
+- Project tools: GitHub, ZenHub, Jira
+- Design tools: Sketch, Zeplin
+- Work tools: Slack, Zoom, Google Team Drive, Dashlane
+
+## Office locations
+
+Santa Monica, CA
+
+## How to apply
+
+http://reactioncommerce.com/careers