Senior Frontend Engineer

The Role

Use your extensive knowledge of JavaScript, HTML, and CSS to improve the Slack web client, a complex in-browser application relied upon by millions of users every day. You will work with real-time data streams, engineer for performance across browsers, and delight people by making the best software we can imagine. You will collaborate closely with Product, Design, Application Engineering, and QA to spec, build, test and deploy new features. This position reports directly to the Director of Frontend Engineering. 

A Typical Week

  • You'll brainstorm with Product Managers and Designers to conceptualize new features
  • You'll collaborate with Application Engineering to build new features for our large-and-growing user base
  • You'll learn about new web technologies and discuss potential solutions to problems
  • You'll help our skilled support team triage bugs and troubleshoot production issues
  • You'll mentor other engineers and deeply review code


  • 3+ years of experience writing client-side JavaScript
  • Expertise in building complex layouts with CSS and HTML
  • Experience building and debugging complex systems in a team environment
  • Experience with modern browser technologies
  • Strong UX and design sensibilities, and a desire to sweat the small stuff
  • Strong communication skills, a positive attitude, and empathy
  • Self-­awareness and a desire to continually improve

Bonus Points

  • Academic background in computer science (BSc or MSc)
  • Experience with jQuery, Handlebars, or LESS
  • Experience investigating and improving JavaScript performance
  • Experience with WebSockets, Local Storage, or ES6
  • Experience in small start­up environments
  • Experience designing web sites or applications

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