Hire Android and IOS app developer

App Developer Requirements(2 apps : one mobile app and one app will be deployed on POS device): 1. 5 years of Android development. 2. Have published 3-4 the Mobile (Android or ios) app. 3. Hands-on Experience with OOP and Core Java and strong knowledge of react/angular6 UI design principles, patterns, and best practices. 4. Must have the expert knowledge of hybrid app development. 5. Design, build, and maintain high performance, reusable, and reliable code. 6. Strong knowledge of Android SDK, different versions of Android and their limitations, and how to deal with different screen sizes. 7. Experience with restful APIs to connect applications to back-end services. 8. Familiarity with GCM/FCM and push notifications. 9. Know how to integrate Payment Gateway is a required. 10. Experience with offline storage, threading, and performance tuning. 11. Experience working with various hardware/sensors/GPS/files/DB on android and ios. General: PayCardo provides Contactless & Cashless payment system by offering PayCardo Smart Card to the commuters. This is a one-stop solution to reduce and curb the cash crunch and the spread of virus while commuting. We are looking for a hybrid app developer to build apps for our daily commuters and bus conductors (two separate apps). This will be a contract/freelance opportunity. Payment for this project will be milestone based which will be agreed before starting the project. Contact us for more information and negotiation. Expected timeline: 3 weeks Project budget: 400 - 450 $US [Negotiable]