This is the engineering blog of Slack, the popular workplace messaging platform. It covers how Slack’s team tackles real-world challenges like migrating core infrastructure, building AI agents for security investigations, and scaling observability. Anyone curious about how a large SaaS company operates under the hood will find these posts insightful.
Vol. I · Field Notes
SlackEngineering at Slack
This is the engineering blog of Slack, the popular workplace messaging platform. It covers how Slack’s team tackles real-world challenges like migrating core infrastructure, building AI agents for security investigations, and scaling observability. Anyone curious about how a large SaaS company operates under the hood will find these posts insightful.
9 May 2026·8 posts·6 clusters·7 authors
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Reading Posture
From the Field
“Slack’s engineering blog: scaling reliability, security, and AI agents.”
Verdict:Reach for it
Reach for it when
Read this when you want to see how a mature SaaS platform modernizes infrastructure, adopts AI agents, and improves developer experience at scale.
Look elsewhere when
Skip it if you need beginner tutorials, frontend-focused content, or posts on consumer-scale systems.
In context
Compared to the Uber Engineering Blog, this one is more focused on security modernization and AI agent workflows rather than broad distributed systems.
Complexity●●●Heavy
Read time~120 minutes
Language
BlogRuntime
webDependencies
0totalWhat this is
As told for the tourist
Start Here
A recommended reading path through the code
Start Here
A recommended reading path through the code
- 01
- 02
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- 07
What's inside
6 sections of the codebase
Posting History
Activity over time
Posting Activity8 posts · 2025-10 → 2026-05
2025
4 posts
2026
4 posts
LessMore
The Archive
Every post, searchable and filtered
All Posts8 of 8
2026-05↗2026-04↗2026-03↗2026-03↗2025-12↗2025-11↗2025-11↗2025-10↗
From SSH to REST: A Security-Driven Modernization of Slack’s EMR Data Pipelines
8mSlack modernized its data pipelines by replacing 700+ SSH-based operators with a REST-based approach for improved security and scalability.
Security & Infrastructure Modernization#security#architecture#scalingMahendran Vasagam
Managing context in long-run agentic applications
10mThis post discusses challenges and mechanisms for maintaining alignment and coherent reasoning in long-running agentic systems.
Agentic Systems & Automation#architecture#deep-diveDominic Marks
From Custom to Open: Scalable Network Probing and HTTP/3 Readiness with Prometheus
7mSlack describes migrating from custom network probing tools to a scalable Prometheus-based solution for HTTP/3 readiness.
Observability & Network Probing#networking#open-source#scalingCarlo Preciado
How Slack Rebuilt Notifications 📣
9mSlack rebuilt its notification system from the ground up to reduce overwhelm and improve user experience.
User Experience Redesign#architecture#product-engineeringFrances Coronel
Streamlining Security Investigations with Agents
6mSlack's Security Engineering team uses agent-based systems to streamline security investigations from billions of daily events.
Agentic Systems & Automation#security#ml-infraDominic Marks
Android VPAT journey
5mThis post details Slack's journey to create an Android Voluntary Product Accessibility Template (VPAT) to document accessibility standards.
Accessibility & Compliance#culture#tutorialHye Jung Choi
Build better software to build software better
7mSlack's build pipeline team reduced build times from 60 minutes to improve developer velocity and feedback loops.
Developer Productivity & Tooling#performance#developer-tools#dxDavid Reed (he/his)
Advancing Our Chef Infrastructure: Safety Without Disruption
6mSlack advanced its Chef infrastructure to a multi-stack model, focusing on safety and minimal disruption during migration.
Security & Infrastructure Modernization#infra#architectureArchie Gunasekara
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