Clients need: Big local company needs simple and secure system to control the employees' entrance and exit to the big office as it is hard to control their physical presence in the office. Our solution: System built on NFC technology. It relieves employees from the necessity to make extra actions passing through the doors and marks their door-in to door-out time for the employer automatically. Every employee has the mobile app (iOS or Android) that interacts with check in system when he/she is entering or quitting the office. System provides employees' identification and time-tracking. Technologies applied: Java, Spring, Spring MVC, Spring Security, Hibernate, Maven, Android, iOS, NFC, push notification, aws