S

Slack Tech Stack

Workplace platform with AI automation, search, and team connectivity

Technology, Information and Internet San Francisco, California 1,001–5,000 employees Public Company

Slack operates a 1,000+ person organization running a broad tech stack (iOS, AWS, Kubernetes, Salesforce, Claude, Apache Airflow, Temporal) while actively scaling data infrastructure and real-time analytics capabilities. The hiring velocity is minimal despite 69 open roles, with senior and staff engineers dominating the candidate mix—a pattern typical of mature, stability-focused products. Active projects center on AI agents, real-time OLAP, data residency, and cost optimization, while pain points cluster around performance reliability, scaling data systems, and driving mobile AI adoption.

Tech Stack 42 technologies

Core StackAWS Linux Salesforce Swift Python MuleSoft Tableau Figma JavaScript Go Java PHP MySQL Kubernetes Terraform Trino Apache Airflow Temporal iOS Bazel Bash Xcode Claude Salesforce Marketing Cloud HTML CSS Vitess Chef StarRocks Apache Pinot+10 more

What Slack Is Building

◆Challenges

High performance and reliability
Improving security and cost efficiency
Developer productivity
Global compliance with minimal latency
Scaling data infrastructure
Reducing noise
Reducing cost and load
Driving ai adoption on mobile
Enabling self-service data workflows
Defending against large-scale network threats

▲Active Projects

Enterprise key management
World-class data science and analytics platform
Creating and scaling agents to enable engineers and users on their workflow and data needs
Enabling more realtime olap capabilities for internal and external customers
Context-aware mobile experiences
Scaling our compute and orchestration layer
Develop ml models supporting ranking, retrieval, and generative ai use-cases
Data residency compliance
Context-powered productivity experiences
Build new features for our large user base

Hiring Activity

Minimal70 roles · 5 in 30d

Department

Engineering

40

Product

15

Data

4

Design

4

Sales

3

Research

1

Security

1

Seniority

Senior

30

Staff

24

Director

6

Principal

3

Mid

2

Intern

1

Junior

1

Lead

1

Notable leadership hires: Research Operations Lead

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About Slack

Slack is a workplace productivity platform designed to reduce operational friction through team messaging, knowledge sharing, and no-code automation. The product integrates deeply with Salesforce Customer 360, extending into sales, service, and marketing workflows. As a public company with 1,001–5,000 employees based in San Francisco, Slack operates globally, with hiring across the United States, Ireland, Mexico, the United Kingdom, and Canada. The engineering organization is heavily weighted toward senior and staff-level roles, reflecting maturity in product and infrastructure layers rather than rapid scaling.

HeadquartersSan Francisco, California

Company Size1,001–5,000 employees

Hiring MarketsUnited States, Ireland, Mexico, United Kingdom, Canada

Frequently Asked Questions

What tech stack does Slack use?

Slack's top 30 tools include iOS, AWS, Linux, Salesforce, Swift, Python, Go, Kubernetes, Temporal, Apache Airflow, Apache Pinot, Trino, MuleSoft, Tableau, and Claude. The stack spans mobile (iOS, Swift, Xcode), infrastructure (AWS, Kubernetes, Terraform, Chef), data (Airflow, Pinot, Trino, Vitess), and AI (Claude).

What is Slack working on?

Current projects include AI agents for workflow automation, real-time OLAP analytics for internal and external customers, enterprise key management, data residency compliance, context-aware mobile experiences, and ML models for ranking and generative AI. Data infrastructure scaling and cost reduction are active areas.