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Senior Frontend Infrastructure & Performance Engineer

People love working on Slack — it is a complex web application used by millions of people for hours or even days at a time. Our engineering team is tasked with keeping it fast and reliable, and maintaining the systems that the rest of our frontend team uses to build their features.

We’re looking for a Senior Software Engineer with experience in behind-the-scenes JavaScript to get the job done — if you’re more interested in wrangling WebSockets than writing CSS, you’ll fit right in here. We love performance optimization, writing unit tests, improving maintainability, and iterating on best-practices with the rest of the frontend teams. We also work with backend infrastructure engineers to design new services to better support Slack clients.

Our work depends on working closely with other teams at Slack, so communication and collaboration skills are a must. This is an opportunity to work on a small team that directly affects how Slack’s desktop web client is built.

This position is based in San Francisco and reports to one of our engineering managers.

Requirements:

  • You know the weirdest parts of JavaScript and love working with it anyway.
  • You know your way around the performance profiling and debugging tools in your web browser of choice.
  • You’re up to speed with WebSockets, Fetch, Promises, ES6, and beyond.
  • You’ve worked with React (or at least understand why it’s important). Familiarity with Redux and Lodash will also come in handy.
  • You’ve been working with front end frameworks and libraries professionally for 5+ years (and having built or contributed to some is a big plus.)
  • Diving into a new system to understand mysterious behavior excites you.
  • You write understandable, testable code with an eye towards maintainability and scalability.
  • You are a strong communicator and are equally comfortable talking with your immediate team, other frontend engineers, or even backend infrastructure engineers.
  • You are ready to learn, but just as excited to teach.
  • You understand that the perfect solution is informed by the people who will be building on your work, rather than being purely dependent on technical merits. Empathy is a feature.
  • You have a bachelor's degree in Computer Science, Engineering or related field, or equivalent training, fellowship, or work experience. 

Slack is the collaboration hub of choice for companies of all sizes, all across the world. By using Slack, they ensure that the right people are always in the loop, that key information is always at their fingertips, and new team members can get up to speed easily. With Slack, teams are better connected.

Launched in February 2014, Slack is the fastest growing business application ever and is used by thousands of teams and millions of users every day. We currently have nine offices worldwide, in San Francisco, Vancouver, Dublin, Melbourne, New York, London, Tokyo, Toronto and Denver.

Ensuring a diverse and inclusive workplace where we learn from each other is core to Slack's values. We welcome people of different backgrounds, experiences, abilities and perspectives. We are an equal opportunity employer and a pleasant and supportive place to work. Pursuant to the San Francisco Fair Chance Ordinance, we will consider for employment qualified applicants with arrest and conviction records.

Come do the best work of your life here at Slack.