Corporate Messenger from Scratch: How We Built Our Own Slack in 6 Months Without Losing Data

Serhii Shypylov

• 2 min read

Introduction

Purchasing off-the-shelf communication solutions for an IT project is like renting an apartment. You pay every month, but you can't repaint the walls. Building your own messenger is like constructing a house. It takes longer, costs more, but everything is built to your blueprint.

Key insight: a custom messenger is not a luxury, but a strategic tool that can be perfectly integrated into your project's unique business processes.

Why Build Your Own Instead of Using a Ready-Made Solution? The Three Pillars of Security

The main argument is control. You decide where your data resides and who has access to it. This is critical for projects in fintech, healthcare, or any sector with strict compliance requirements.

  • 🔒 Full Data Sovereignty: Servers in your own data center or with a trusted provider. No third-party clouds with questionable jurisdiction.
  • 🛡️ End-to-End Encryption (E2EE) by default: Even if a malicious actor gains access to the server, they will only see a "jumble" of encrypted messages.
  • ⚖️ Compliance with Standards: You implement GDPR, HIPAA, or other regulations yourself, rather than hoping the vendor has done it.

Choosing the Tech Stack: Fast, Secure, Scalable

The technical foundation determines everything: speed, stability, and growth potential. Here's what to build on.

  • 🌐 WebSocket for real-time communication: A protocol for instant two-way communication. Messages fly without delays or constant "is there anything new?" requests.
  • 🔐 Encryption: Libraries like libsodium for cryptography. Algorithms like XChaCha20-Poly1305 or AES-256-GCM for content protection.
  • ⚙️ Backend: Go (Golang) or Rust for a high-performance and secure server. Node.js with Socket.io for a quick start.
  • 🖥️ Frontend: Any modern framework (React, Vue.js). The key is to plan for caching and offline operation.
  • 🗄️ Database: PostgreSQL for reliability and complex queries. Redis as a cache for sessions and online statuses.
Don't chase trendy stacks. Choose proven, mature technologies with strong communities. Stability is more important here than hype.

Integration into Business Processes: The Messenger as a Hub

This is where the magic of custom development is revealed. Your messenger becomes the nervous system of the project.

  • 🤖 Automatic notifications from CI/CD (Jenkins, GitLab), monitoring systems (Grafana), and ticketing systems (Jira) directly into work chats.
  • 🔧 Mini-apps (widgets) inside chats: Quick view of a ticket, deployment approval, voting — without switching tabs.
  • 📁 Direct document handling: Upload a file to a chat — it automatically goes to the right folder on the corporate Nextcloud or ownCloud.
  • 🎯 Creating tasks from a message: Highlight text — click "Create Task" — it's already in your Redmine or Asana with a link to the context.

Launch and Life After: Not Just Develop, But Also Maintain

Launch is just the beginning. For the system to thrive, processes are needed.

Stage 1: Pilot Group. Launch the messenger for the development department. They will forgive bugs and provide valuable feedback.

Stage 2: Gradual Rollout. Connect other departments, training them on the unique integration features.

Stage 3: Monitoring and Development. Track metrics: server response time, user satisfaction, integration usage. The development roadmap should be planned six months ahead.

The most important step is to assign a responsible person (administrator) for the system from day one. Without this, it will quickly turn into a digital graveyard.

Building a corporate messenger is a complex but rewarding path. You get not just "another chat," but a secure, flexible, and deeply integrated digital environment for your team's work. It's an investment in efficiency and peace of mind.

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Want to implement this in your business? Contact us!

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