With a robust proficiency in Kotlin and a comprehensivemobile app development experience, I believe I can swiftly add the custom header token to your WebView. My adept understandings of WebView integration and implementing custom header tokens make me an ideal fit for this project. Based on your description you prefer seasoned Kotlin developers who work well under tight deadlines -- that's practically my day-to-day habit.
Implementing APIs is second nature to me. Through my training in version control systems like Git, I've mastered the art of tracking code changes and working collaboratively on GitHub. Rest assured, I will deliver an optimal performance by rigorously testing your app to identify and fix hidden bugs before you can find them.
To stay updated in this ever-evolving tech world, I firmly stand by continuous learning. My proficiency with NoSQL databases (like MongoDB) and server-side programming with Node.js have sharpened my skills as a full-stack developer. Overall, my goal is to bridge the gap between user-experience and server-side functionality, ensuring a user-friendly, efficient, and reliable application in tandem with meeting all deadline-driven requirements.