NexaFlow is a B2B workflow automation platform designed to help operations teams build, manage, and monitor complex automated pipelines without writing a single line of code. The platform features a drag-and-drop visual builder, real-time collaboration, and deep integration capabilities via webhooks and a REST API.
The product serves teams ranging from 5 to 500 people, with a tiered pricing model and a multi-tenant architecture built to support thousands of concurrent users across isolated workspaces.
One of the core engineering challenges was building a real-time collaborative canvas where multiple users can edit the same pipeline simultaneously without conflicts. I implemented Operational Transformation (OT) on the server side using WebSockets to merge concurrent changes gracefully.
Another significant challenge was the execution engine — pipelines needed to run reliably at scale, support retry logic, conditional branching, and parallel execution steps. I built this as a separate microservice using a Redis-backed queue (BullMQ) and a stateful FSM for each pipeline run.
The platform includes a visual drag-and-drop builder with 40+ pre-built integration nodes (Slack, Notion, HubSpot, etc.), a real-time run history view with granular step logs, a webhook trigger system, a role-based access control system, team workspaces with billing isolation, and an OAuth-based partner app marketplace.