In the ever-evolving Android ecosystem, security is no longer optional—it's mission critical. This lightning talk will walk you through the most common real-world security pitfalls developers face while building Android apps—from insecure data storage and weak authentication flows to man-in-the-middle attacks and exposed APIs. Through real examples and short code demos, I’ll highlight: The top 5 most common security flaws in Android apps (and how attackers exploit them) Modern best practices for securing user data and network communication How tools like Jetpack Security, EncryptedSharedPreferences, and SafetyNet help you stay protected Quick wins to implement defense-in-depth without slowing down development Whether you're building fintech, healthtech, or even a simple social app, this talk will give you actionable tips to make your apps safer—today.