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Engineering Blog

Slack Engineering

11 articles on EngBrief

Slack Engineering shares how the team behind one of the world's most popular workplace collaboration tools builds, scales, and operates their platform. Posts cover real-time messaging infrastructure, search, security, developer experience, and the challenges of serving millions of concurrent users.

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Latest Articles

Slack10d ago

Managing context in long-run agentic applications

To balance continuity and creativity in long-run agentic applications, Slack Engineering employed three context channels: the Director's Journal (structured working memory), the Critic's Review (annotated findings report with credibility scores), and the Critic's Timeline (consolidated chronological findings with credibility scores). The channels provide the context each agent needs without overwhelming them. The Director's Journal serves as the common narrative that keeps other agents on track, while the Critic's Review and Timeline provide a more detailed view of the investigation state. These context channels enabled the agents to maintain alignment and coherent reasoning in complex, long-running investigations, solving the problem of managing context in agentic applications. This solution maintains the delicate balance between sharing information and encouraging creativity among agents.

CollaborationInfrastructure
1 min
Slack23d ago

From Custom to Open: Scalable Network Probing and HTTP/3 Readiness with Prometheus

Here's a 2-3 sentence summary of the blog post: To improve network probing and HTTP/3 readiness, Slack's infrastructure team contributed open-source QUIC support to the Prometheus Blackbox Exporter (BBE), enabling them to probe hundreds of thousands of HTTP/3 endpoints and gain client-side visibility. The integration, spearheaded by an intern, maintained existing architecture and followed existing patterns, making it a successful contribution to the Prometheus community. This upgrade provides a unified view of HTTP/1.1, HTTP/2, and HTTP/3 metrics, enabling better alerts, easier correlation with other telemetry, and future-proofed observability for ongoing adoption of QUIC and HTTP/3.

CollaborationInfrastructure
1 min
SlackMar 19, 2026

How Slack Rebuilt Notifications 📣

Here's a 3-sentence summary of the engineering blog post: Slack rebuilt its notification system from the ground up to reduce noise and improve clarity, simplifying user choices and settings across desktop and mobile platforms. The team addressed four architectural problems in the legacy system - conflicting mental models, hidden coupling, inconsistent state, and power user frustration - through a unified notifications model, simplifying choices, advanced controls, and global preferences. The new system, which tackled three major technical challenges, improved the overall user experience, reduced confusion, and provided a consistent notification experience across all platforms.

CollaborationInfrastructure
1 min
SlackDec 1, 2025

Streamlining Security Investigations with Agents

Slack’s Security Engineering team is responsible for protecting Slack’s core infrastructure and services. Our security event ingestion pipeline handles...

CollaborationInfrastructure
1 min
SlackNov 19, 2025

Android VPAT journey

Background A Voluntary Product Accessibility Template (VPAT) is a document that outlines how well a product aligns with accessibility (a11y) standards. Its...

CollaborationInfrastructure
1 min
SlackNov 6, 2025

Build better software to build software better

We manage the build pipeline that delivers Quip and Slack Canvas’s backend. A year ago, we were chasing exciting ideas to help engineers ship better code,...

CollaborationInfrastructure
1 min
SlackOct 23, 2025

Advancing Our Chef Infrastructure: Safety Without Disruption

Last year, I wrote a blog post titled Advancing Our Chef Infrastructure, where we explored the evolution of our Chef infrastructure over the years. We talked...

CollaborationInfrastructure
1 min
SlackOct 7, 2025

Deploy Safety: Reducing customer impact from change

It’s mid 2023 and we’ve identified some opportunities to improve our reliability. Fast forward to January 2025. Customer impact hours are reduced from the peak...

CollaborationInfrastructure
1 min
SlackSep 4, 2025

Building Slack’s Anomaly Event Response

As cyberattacks evolve to unprecedented levels of sophistication and speed, the time gap between breach detection and response has never been more critical....

CollaborationInfrastructure
1 min
SlackApr 14, 2025

Optimizing Our E2E Pipeline

In the world of DevOps and Developer Experience (DevXP), speed and efficiency can make a big difference on an engineer’s day-to-day tasks. Today, we’ll dive...

CollaborationInfrastructure
1 min
SlackMar 7, 2025

How we built enterprise search to be secure and private

Many don’t know that “Slack” is in fact a backronym—it stands for “Searchable Log of all Communication and Knowledge”. And these days, it’s not just a...

CollaborationInfrastructure
1 min