With over 18 years of experience in web and app development, specifically in PHP, I am more than equipped to take on the responsibilities of your project. My specialization in CodeIgniter, Laravel, and also Flutter directly meet your requirements for custom PHP coding. As evident from my profile, I have been successful in integrating APIs and creating/ modifying modules which aligns perfectly with the primary tasks here.
Additionally, my background in database management and knowledge of modern software architecture makes me an ideal candidate for this position. My expertise extends beyond PHP into areas like MySQL, which further complements the need for database management. Moreover, my experience in building web applications guarantees a well-rounded perspective essential to blend the different aspects together seamlessly.
Over my freelance career, I've completed numerous projects within budget and ahead of schedule - a testament to my hard work ethic. Let me assure you that if chosen for this project, not only will I produce quality code but will also ensure it aligns perfectly with pre-existing modifications if any. Thus, I am not just fit for this job - I'm the best choice!