Great! Hiring a React Developer for a custom software development company can be an excellent decision as React is one of the most popular JavaScript libraries for building user interfaces.

To find the right candidate, here are a few things you can do:

Write a clear job description: Start by writing a clear and concise job description that outlines the required skills and experience for the role. Be specific about the technologies and tools the candidate should be proficient in, such as React, JavaScript, Redux, and CSS.

Use specialized job portals: Post your job opening on specialized job portals for tech talent. Some popular portals include Stack Overflow Careers, GitHub Jobs, and LinkedIn.

Look for relevant experience: Look for candidates who have experience working on React-based projects or who have experience with similar technologies. Ask for their portfolio or work samples to evaluate their proficiency.

Conduct a technical interview: Once you have shortlisted the candidates, conduct a technical interview to assess their knowledge and skills in React. Ask them to write code snippets, solve problems, or debug issues to evaluate their expertise.

Evaluate soft skills: While technical skills are crucial, it's also essential to evaluate a candidate's soft skills such as communication, teamwork, and problem-solving. Look for candidates who can collaborate with other developers, communicate well with clients, and can solve problems creatively.

Remember, hiring the right React developer can be a game-changer for your custom software development company, so take your time to find the right fit. Good luck!