with more than 3 years of mobile development specially in android with java, i will make any application you want based on your specifications and requirements with java and any Data Base Type you want (from Oracle, Firebase , MySQL .... ) also i work with agile framework Scrum because I'm Professional Scrum Master. in last two applications i worked in E banking application where we handle all Bank operations from creation new Client, creation of new contract ... with Spring framework (boot, data , JPA, Hibernate, security, ...), also i worked in system where we handle all operation of big market operation with Spring framework and Oracle db .