Sr. Software Engineer, Full Stack - Slack

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* Job Category Software Engineering Job Details
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Slack is seeking a Senior Full-Stack Engineer to design and deliver end-to-end features while advancing the performance, reliability, and scalability of
** Huddles**—Slack’s video conferencing experience and one of our most heavily used products.  We’re looking for engineers who are passionate about building exceptional, real-time web applications at global scale.
Our systems are built on proven, production-hardened technologies the team knows and trusts, including
** PHP/Hack, Java, JavaScript/Type Script, MySQL, Redis, and Linux**. We also support native clients across
** iOS, Android, Windows, and macOS**.

Experience with additional languages (e.g., Java, Kotlin, Objective-C) and distributed systems is a strong plus.
We are a deeply collaborative team working across product, design, backend, and client platforms to continuously improve Slack and Huddles. We value engineers who are pragmatic in their technology choices, thoughtful in system design, and who balance simplicity, reliability, and long-term maintainability in everything they build.

** ABOUT THE TEAM
** The Huddles team owns Slack’s video conferencing experience, serving 4.8M+ weekly active users. We compete directly with industry leaders like Google Meet and Zoom—yet we’re still early in shaping the future of synchronous collaboration inside Slack.
We’re driving an ambitious roadmap that includes:
* AI-powered meeting experiences
* Expanded real-time collaboration capabilities
* Richer, more immersive communication features

As part of this team, you’ll also contribute to a specialized group advancing Slack’s audio/video platform, supporting both Huddles and Clips. This dual focus blends cutting-edge A/V infrastructure with robust, user-centric frontend architecture to deliver seamless end-to-end experiences.
If you’re excited about building high-impact features used by millions daily—and redefining remote collaboration in a digital-first workplace—we’d love to meet you.

** What you will be doing
*** Partner with Product Managers and Designers to ideate, build, and launch new features across Huddles and Clips
* Design and implement end-to-end solutions spanning frontend, backend, and real-time communication layers
* Debug and optimize audio/video performance across diverse devices, browsers, and network conditions using WebRTC and related technologies
* Identify and resolve performance bottlenecks in real-time systems, from React/Redux rendering to backend infrastructure
* Establish high engineering standards through code quality, system design, and reusable architectural patterns
* Improve observability by building monitoring, logging, and performance instrumentation for A/V systems
* Support production excellence by partnering with Customer Experience teams to triage and resolve issues
* Mentor engineers and provide thoughtful, in-depth code reviews
** What you should have
*** 5+ years of professional experience building and shipping web applications
* Strong proficiency in
** React and Redux**, including frontend performance optimization
* Experience with one or more backend languages (e.g., PHP, Python, Ruby, Go, Java,

C)
* Expertise in building complex, high-fidelity UI with HTML and CSS
* Deep understanding of real-time or distributed systems, including fault tolerance, consistency, and scalability
* Strong computer science fundamentals (data structures, algorithms, systems design)
* Experience working with relational databases and common web stacks
* Product mindset with strong UX sensibilities and attention to detail
*…