• Your front-end is polling every few seconds and your server is drowning in requests for data that hasn't changed?

  • You have a real-time use case but you're not sure whether WebSocket, SSE, or long-polling is the right fit?

WebSocket Development

RaftLabs builds WebSocket servers and client integrations for applications that need persistent, bidirectional, low-latency connections. Chat applications, live data feeds, collaborative tools, multiplayer features, and any use case where polling creates unnecessary load and visible lag.
We design the server architecture, handle authentication and session management over WebSocket, implement the reconnection logic that keeps connections stable across network drops, and load-test the full system to confirm it holds at your target connection count.

  • Bidirectional WebSocket connections with sub-100ms latency at scale

  • Secure WebSocket authentication -- token validation on handshake, not just on HTTP

  • Horizontal scaling via Redis Pub/Sub so any server node reaches any connected client

  • Load-tested to your concurrent connection target before delivery

RaftLabs builds WebSocket servers and client integrations for chat, live feeds, collaborative tools, and multiplayer applications. We handle authentication, horizontal scaling via Redis Pub/Sub, and reconnection logic -- and load-test every system to your concurrent connection target before delivery.

Vodafone
Aldi
Nike
Microsoft
Heineken
Cisco
Calorgas
Energia Rewards
GE
Bank of America
T-Mobile
Valero
Techstars
East Ventures

WebSocket creates a persistent, full-duplex connection between a client and a server over a single TCP connection. Unlike HTTP, where each request opens and closes a connection, WebSocket keeps the channel open so either side can send data at any point without the overhead of a new handshake. That persistence is what enables sub-100ms update delivery -- the kind of latency your users feel when they see data change the moment it changes, without waiting for their next poll request to fire.

The engineering challenge with WebSocket is not opening a connection -- any modern framework can do that. The challenge is making it reliable at scale: handling reconnections when networks drop, distributing messages across multiple server instances, validating authentication without relying on standard HTTP headers, and monitoring connection health so failures surface before users notice them. RaftLabs has solved these problems in production systems and brings that implementation pattern to your application.

What we build

WebSocket server architecture

We design the WebSocket server layer -- process architecture, connection lifecycle management, heartbeat and keepalive logic, and graceful shutdown handling. The server is built to handle your peak concurrent connection count with headroom, and we document the scaling path so your team knows exactly what to provision when traffic grows beyond the initial target.

Real-time chat and messaging

Full chat implementations: private messaging, group channels, typing indicators, read receipts, and message history. We handle the WebSocket event schema, the server-side message routing, and the front-end state management so your chat feature behaves like a native messaging application rather than a hacked-together polling loop.

Live data feed integration

WebSocket connections to external data sources -- market feeds, IoT sensor streams, third-party event APIs -- normalised and forwarded to your front-end clients. We handle rate limiting, connection recovery when the upstream drops, and the fan-out logic that sends one upstream event to thousands of connected clients without multiplying your upstream API costs.

WebSocket authentication and security

Token-based authentication on the WebSocket handshake, session expiry handling, and forced disconnection when permissions change. We make sure your WebSocket endpoints are not accessible to unauthenticated clients, that tokens cannot be intercepted via URL parameters, and that your existing auth system -- JWT, session cookies, or OAuth -- integrates cleanly with the WebSocket upgrade flow.

Horizontal scaling for WebSocket connections

Redis Pub/Sub or message broker integration so your WebSocket layer scales across multiple server instances without losing message delivery. We design the pub/sub channel topology, test message delivery under multi-node load, and configure your load balancer for WebSocket-compatible routing -- sticky sessions or connection-aware upstream selection depending on your infrastructure.

WebSocket reconnection and reliability

Exponential backoff reconnection on the client, server-side connection state recovery, and message buffering so events that arrive during a brief disconnection are delivered when the client reconnects. We also implement connection health monitoring so your operations team sees degraded WebSocket reliability before it becomes a support ticket from a user.

Not sure if WebSocket is right for your use case?

We run a short technical assessment to identify the right protocol -- WebSocket, SSE, or something else -- and what it will cost to implement properly. No obligation.

Talk about your WebSocket project

Frequently asked questions

WebSocket is the right choice when you need bidirectional communication -- the client sends data to the server and the server sends data back in real time. Chat, multiplayer, collaborative editing, and live bidding all fit this pattern. Server-Sent Events are simpler and sufficient when the data flow is only server-to-client, such as a live news feed or a progress indicator. Polling is appropriate only for infrequent updates where simplicity outweighs the cost of unnecessary requests -- typically update intervals longer than 30 seconds. We assess your use case and recommend the protocol that matches your latency requirement and infrastructure budget.

WebSocket connections are stateful -- a client is connected to one specific server process. When you scale horizontally, you need a mechanism for a message originating on server A to reach a client connected to server B. We solve this with a shared pub/sub layer, typically Redis Pub/Sub, so any server node can publish an event and every node with a matching subscriber delivers it. We design the pub/sub topology as part of the engagement and load-test the multi-node setup under your peak connection targets.

HTTP cookies and standard auth headers are not sent with WebSocket upgrade requests in all client environments, so authentication needs to be handled deliberately. We validate a short-lived token on the WebSocket handshake before the connection is established -- the client requests the token via a standard authenticated HTTP call and passes it on upgrade. This keeps auth logic consistent with the rest of your application without exposing credentials in URL query parameters. Session expiry and forced disconnection on permission changes are also handled as part of the implementation.

Adding a WebSocket feature to an existing application -- a live notification feed, a real-time count, or a presence indicator -- typically runs $15,000 to $50,000 depending on the complexity of the server-side event logic and the number of client environments. Building a full WebSocket platform with authentication, horizontal scaling, monitoring, and multiple real-time features ranges from $50,000 to $150,000. We provide a fixed-cost quote after a scoping call where we review your stack and define the delivery milestones.