The company is using
following
technologies

iOS

development

Objective-C

Objective-C is a programming language that is used in the OS X and iOS operating systems and their application programming interfaces (APIs).

Swift

Swift is a powerful and intuitive programming language for macOS, iOS, watchOS and tvOS. 
Swift is a modern and easy to use language. It provides to developers easy apis to have greater functionality with less code.

React Native

React Native is a JavaScript framework for writing real, natively rendering mobile applications for iOS and Android.
React native is optimized for iOS platform.
Performance applications with nice design it is much easer with React Native.

Android

development

Java

Java is the technology of choice for building applications using managed code that can execute on mobile devices.

Kotlin

Kotlin is a powerful and intuitive programming language for Android, Android Wear, Android TV. 
Kotlin is a modern and easy to use language. It provides to developers easy apis to have greater functionality with less code.
Kotlin is officially supported by Google for mobile development on Android.Since the release of Android Studio 3.0 in October 2017.

React Native

React Native is a JavaScript framework for writing real, natively rendering mobile applications for iOS and Android.
Performance applications with nice design it is much easier with React Native.

Web

development

Java

Java EE, Spring,
GWT, Hibernate,
Struts, Grails

JavaScript

React JS, AngularJS,
ExpressJS

Ruby

Rails

Python

Django, TensorFlow,
DEAP

Database

Oracle DB,  Mongo DB,
MySQL, PostgreSQL

Devops

Cloud, On-Premises
and Hybrid infrastructure Architecture/
Deployment/
Maintenance

AWS, Microsoft Azure, Google Cloud Platform, DigitalOcean,
Red Hat OpenStack Platform, Oracle Cloud, vSphere, Proxmox

CI/CD

Jenkins, Gitlab CI

Automated workflow

Ansible, Puppet, Packer, Terraform,
Ansible Tower/AWX, HashiCorp Suit

Security and Compilence

Logging and Monitoring

Graylog, Zabbix, ELK, Grafana, NGINX Amplify

Containerization/Orchestration

Docker (Docker compose, Docker Swarm, Docker Cloud),
LXD, Kubernetes, Rancher, Red Hat OpenShift, Nomad

Web Servers, High Availability,
Load Balancing and Caching

NGINX Plus/NGINX/NGINX Unit/NGINX Controller,
Apache, Tomcat, HAProxy, Keepalived, Varnish