Suggestions on best work process approach for Design + Development in React

We are a small product team of 5 people with one person handling the entire UI-UX of the product and 2 people handling the Frontend. The frontend team's expertise lies in the traditional html+cc+jquery framework with basic to intermediate knowledge of working in React. Would be keen to know if any of you or your teams have any suggestions on the two below approaches for design+FED. Or anybody has any other design + FED approach which is faster and efficient and consists React for FED. Would love to hear about experiences in ReactStudio also.

  1. Design in Sketch App > Upload to Reach Studioand export React code and get to react developer who cleans up the code and integrates with the backend node API.

  2. Sketches or mock-ups done in UXpin or any other design application. Work with React developer to execute the design using Isomorphic react theme. This approach would save a lot of time creating react components.