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I will build a custom react flow workflow builder application
Andrew Kasian
About this gig
Visual workflow builders and node-based editors are becoming a core part of many SaaS products, but they are harder to build well than a typical dashboard. Drag-and-drop, node connections, branching logic, and execution feedback need experience with the underlying canvas library to feel smooth.
I build these interfaces with React Flow: draggable nodes, custom node types, conditional branching, connected data flow between steps, and live execution monitoring showing each step's status and output as a workflow runs. One of my projects is a visual AI workflow builder with prompt, search, and knowledge-base nodes, plus a real-time panel tracking progress, logs, and token usage.
This Gig covers the frontend: canvas, node system, connection logic, and execution UI, integrated with your existing backend. I do not build the automation engine itself, but connect the interface to whatever executes your workflows.
10+ years in frontend engineering across SaaS and workflow-heavy applications, with hands-on React Flow experience building this exact type of interface.
Before ordering, send a short description of your workflow use case and node types so I can recommend the right package.
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Get to know Andrew Kasian
Andrew Kasian
Senior Frontend Engineer
- FromUkraine
- Member sinceJul 2026
Languages
Ukrainian, Russian, English
I am a Senior Frontend Engineer with 10+ years of experience building complex React, Angular, and TypeScript applications for SaaS and enterprise products.
I specialize in admin dashboards, workflow-heavy interfaces, frontend architecture, performance optimization, and modernization of mature codebases.
My experience includes improving bundle size by 38%, application performance by 30–35%, and leading a frontend organization of 17+ engineers.
I focus on reliable, maintainable frontend solutions that are ready for real business use.
My Portfolio
FAQ
Do you build the backend or automation engine?
No. This Gig covers the frontend — the canvas, nodes, and execution UI. I connect it to your existing backend or API, or work with mock data while it's being built.
Can you work with my existing React application?
Yes. I can integrate the workflow builder into an existing React or TypeScript codebase and follow its current architecture. Repository access is required before the final scope is confirmed.
Does this include real-time execution monitoring?
Live execution status and logs are included from the Advanced package. Foundation and Production focus on the canvas and node logic without live execution feedback.
Can you add custom node types specific to my product?
Yes. Node types are scoped per package (up to 3 in Foundation, up to 6 in Production and Advanced). Additional custom node types beyond that can be scoped as an extra.
Do you provide support after delivery?
I include revisions during delivery and fix defects related to the delivered scope for 7 days after final approval. New features or scope changes are estimated separately.
