Senior Software Engineer, Frontend Builds & Tooling - Slack

Salesforce is the #1 AI CRM, where humans with agents drive customer success together. The Senior Software Engineer, Frontend Builds & Tooling at Slack will enhance the frontend development cycle, improve engineering standards, and mentor other engineers while focusing on creating efficient and reliable frontend tooling.

Responsibilities:

• You’ll speed up our frontend development cycle by making Slack’s frontend builds faster and more performant
• You’ll brainstorm novel solutions to big, challenging problems to make engineer’s lives simpler and more productive
• You’ll collaborate with your team and others to bring these solutions to life
• You’ll trace, measure and improve the performance characteristics of our internal systems
• You’ll improve engineering standards, tooling, and processes across the Slack org
• You'll identify gaps and challenges, explore potential solutions, and build a roadmap for frontend tooling
• You’ll mentor other engineers and deeply review code
• Build and ship high-quality, production-grade software using modern engineering practices, with AI as a core part of your development workflow by pushing the boundaries of AI development tools to deliver secure, optimized, and high-quality code
• Design and orchestrate complex systems where AI agents integrate seamlessly into human workflows, driving efficiency and innovation at scale
• Contribute to building and maintaining the shared system context, an explicit repository of system designs, constraints, and standards that enables AI to operate accurately and reliably
• Critically evaluate code (Human or AI-generated) for correctness, quality, security, and performance

Requirements:

• 8+ years experience writing JavaScript or TypeScript
• 5+ years experience with configuring and optimizing modern frontend toolchains and build tools (i.e. Webpack, Rspack)
• 5+ year experience building and debugging complex systems in a team environment
• 5+ year experience with CI/CD tools
• 3+ years experience with tsc and/or tsgo
• Bachelor's degree in Computer Science, Engineering or a related field, or equivalent training, fellowship, or work experience
• Strong communication skills, a positive attitude, and empathy
• Self-motivation and the ability to take initiative independently, learn quickly, and meet deadlines
• A demonstrated, genuine AI-first approach to engineering. Using AI to move faster, build fluency across the stack, and contribute well beyond your core specialty
• Experience using AI tools (e.g., Claude Code, GitHub Copilot, Codex, Cursor, etc.) in development workflows
• Advanced prompt engineering skills and the ability to write precise, structured prompts and cultivate the system context that makes AI outputs reliable, secure, and production-ready
• Experience with yarn workspaces
• Experience with Typescript Project References
• Experience with CSS tooling (less, Sass, PostCSS, Lightning CSS)
• Experience with frontend linters like ESLint, Oxlint, Biome
• Experience investigating and improving JavaScript performance
• Experience with PHP or Hack
• Experience (or interest) in the Rust programming language
• Experience with React, Redux