Engineering & Software Development

Realtime Collaboration Engineer

Building a feature where multiple people edit the same document or board at once looks straightforward until two users' changes conflict, or a user goes offline and comes back to a mess. We build the realtime sync layer for multi-user and offline-capable apps using CRDTs or operational transforms, handling presence, conflict resolution, and reconnection correctly rather than papering over race conditions with last-write-wins. This is the right call for products adding live collaboration (shared documents, whiteboards, multiplayer tools) where getting conflict resolution wrong means silent data loss for your users. You get a sync engine that's been tested against the actual failure modes, not just the happy path.

This is a capability we deliver for you as a service, not a role we’re hiring for.

How We’d Approach This

A clear, staged plan, not a black box

These are the service-specific steps inside our six-step process.

1
Map your collaboration model (who edits what, how conflicts should resolve) before picking a CRDT or OT approach.
2
Build the sync engine against one real document type, testing concurrent edits and offline/reconnect scenarios directly.
3
Review conflict-resolution behavior with your team using deliberately adversarial test cases, not just clean demos.
4
Extend the sync layer across remaining document types with presence indicators and reconnection handling in place.

What You Get

Deliverables from this engagement

Working realtime sync engine (CRDT or OT based)
Presence and conflict-resolution logic tested against edge cases
Offline-capable client behavior with reconnection handling
Documentation of the sync protocol for future maintenance

Six Ways We Could Architect This

Different engagement, different build, pick the shape that fits

There’s more than one way to deliver on this service. Browse a few of the ways we’d structure the work, depending on your speed, budget, and integration needs.

Read all 6 architectures as text

Lean Fast-Start Architecture

Client Layer

Browser Client A
Browser Client B
Mobile Client

Sync Core

Single WebSocket Server
Yjs CRDT Document
In Memory Document State
Conflict Merge Function

Presence

Socket Room per Document
Basic Cursor Presence

Persistence

Periodic State Save
Local File Backup
Manual Restore on Crash

Cloud-Native / Managed Services Architecture

Client Apps

Web Client
Mobile Client
Desktop Client

Managed Realtime Infra

Ably or Pusher Channel
Managed WebSocket Scaling
Presence Service

Persistence Layer

CRDT Snapshot Store
Managed Object Storage
Document Metadata Database

Sync Engine

CRDT Merge Engine
Version History Log
Conflict Alert Log

Event-Driven & Automation-First Architecture

Edit Events

Client Edit Operation
Operation Streamed to Broker
Reconnect Detected

Message Broker

Event Broker Queue
Ordered Operation Log

Automated Conflict Resolution

CRDT Merge Function
Automatic Conflict Resolution
Offline Queue Auto Sync on Reconnect

Automated Outputs

Webhook on Save Milestone
Automated Snapshot Job
Version Tag Created
Notification to Collaborators

Enterprise-Grade & Compliance-Ready Architecture

Access Control

Per Document RBAC
Identity Provider Integration
Document Sharing Policy

Secure Transport and Storage

Encrypted Transport TLS
Encrypted at Rest Snapshots
Key Rotation Policy

Audit Layer

Edit Operation Audit Log
Conflict Resolution Audit Trail

Redundancy and Failover

Multi Region Replication
Redundant WebSocket Cluster
Failover Routing
Compliance Dispute Review

AI-Augmented, Human-in-the-Loop Architecture

Live Editing

Concurrent Document Edits
Data Loss Risk Threshold

AI Anomaly Monitor

Merge Pattern Monitor
Unusual Overwrite Detection
High Risk Merge Flag

Engineer Review Checkpoint

Engineer Reviews Flagged Merge
Accept as Canonical State
Manual Conflict Resolution

Strategy Deployment

New Resolution Strategy Proposed
Human Sign Off Before Production
Deployed to Production
Rollback if Strategy Fails

Integration-Heavy / Ecosystem-Connected Architecture

Sync Core

Realtime Sync Engine
Client SDK Layer
Plugin API

Storage Integration

Google Drive or S3 Storage
Document Export Pipeline

Identity and Notification

Identity Provider for Presence
Email Notification on Mention
Slack Notification on Mention

Analytics and Warehouse

Collaboration Metrics Analytics
Export to Data Warehouse
BI Dashboard
Usage Billing Feed

Ready to get started?

Tell us what you’re trying to get done and we’ll help you find the highest-leverage place to start, scoped small enough to prove itself before you commit to anything bigger.

Talk to us about Realtime Collaboration Engineer

Most engagements like this start as a $500–$2,500 pilot, see full pricing.