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Sr. Staff Software Engineer, Frontend (Web Performance) - Slack

Slack

$230,700 - $384,100
Nov 12, 2025
Bellevue, WA, United States of America
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Salesforce is looking to improve the web performance of Slack's web client, a complex in-browser application relied upon by millions of users, by conceptualizing, designing, building, and delivering new architecture projects to continually improve the end-user experience.

Requirements

  • 10+ years of experience writing client-side JavaScript, TypeScript, and/or React Framework
  • Expertise investigating and improving web application performance
  • Experience building and debugging complex systems in a team environment, and a desire to sweat the small stuff
  • Experience with modern browser technologies
  • Experience designing and running experiments to evaluate performance efforts
  • Experience as a Tech Lead in driving team technical strategy and overseeing team technical work
  • Experience with WebRTC

Responsibilities

  • You'll lead full-time project work for a direct team of FE web engineers
  • You'll oversee technical strategy, guidelines, and cross-team efforts for web performance across all of Slack's web engineering teams
  • You’ll propose, prototype, and evaluate ideas for improving Slack’s web performance frameworks, bottlenecks, and observability
  • You'll monitor, learn about, and evaluate new web technologies and potential long-term investments
  • You'll author code that sets the standard for quality and velocity for your team, and establishes patterns for other teams to follow
  • You'll help triage bugs and troubleshoot production issues
  • You'll mentor other engineers and deeply review code

Other

  • Strong communication skills, a positive attitude, and empathy
  • Self-­awareness and a desire to continually improve
  • Experience developing an application with long-lived sessions, including updating state with a real-time event stream
  • Slack has a positive, diverse, and supportive culture—we look for people who are curious, inventive, and work to be a little better every single day. In our work together we aim to be smart, humble, hardworking and, above all, collaborative.
  • Salesforce is an equal opportunity employer and maintains a policy of non-discrimination with all employees and applicants for employment.