As an Indian developer looking to apply for onsite jobs, the first step is to research and identify potential job opportunities on platforms like LinkedIn, Glassdoor, and Indeed. After finding a suitable position, make sure to tailor your resume and cover letter to highlight relevant technical skills and experience. Networking with professionals and participating in developer communities can also help open doors to onsite job opportunities. Additionally, obtaining necessary certifications and enhancing your portfolio will increase your chances of being selected. Lastly, ensure you have necessary travel documents like passports and visas, as they are crucial for onsite job applications.