- Operating System: Debian
- Java Technology:
- Java 8-18
- Spring framework
- Spring Boot
- Java frameworks
 
- Software Architecture Pattern: Microservices, cloud-based
- XenServer
- Fastly
- Preact
- Cloudflare
- Lightstreamer Server
- 3rd party software integration
- Designing a system of billions of users and further
- Microservices Architecture
- Distributed system design
- Cloud Security
- Saleforce Integration
- Web Services Security
- Log: Logstash, Vector, Filebeat, FluentD, Promtail
- Apache Kafka
- Information Architecture
- Integration Architechure
- Metadata Design
- Jboss App Server
- LEMP Stack
- Test the system with billions of concurrent connections: Gatling, Tsung, JMeter, Locust, Locust.
- MQTT Server
- Kafka
- Fluentd
- OpenStack
- HAProxy
- Gunicorn
- RabbitMQ
- Celery
- Memcache
- Fabric
- Puppet
- Piston
- Akamai
- Android Wear SDK
- Babel
- Bootstrap
- Bugsnag
- Datadog
- Digicert
- Zencoder
- UserTesting
- Twilio
- Sentry
- Sakurity
- Phusion Passenger
- PagerDuty
- New Relic
- Librato
- HackerOne
- Membase
- Rackspace
- Protocol buffers
- Chubby
- Borg
- gRPC
- Varnish
- Chef
- Nagios
- Cacti
- LevelDB
- IndexedDB
- HHVM
- Hack
- Capistrano
- Next.js, React Query, Ant Design, Zustand, ThemeUI, RainbowKit, React Hook Form
- Finance and Accounting: Braintree Payments, FundersClub, Payoneer, PayPal
- HR: Cloudpeeps, Culture Amp, HackerRank, Piazza
- Analytics: Apache Hadoop, Concurrent, Droplr, Heap, Google Analytics
- Product and Design: Asana, Freedcamp, Google Fonts, Invision
| HETA   | LSW   | TATIN   | KUCKA   | POKO   | 
| XUOU   | FEMTO   | TEN   | GAME   | O E N   | 
| Arten   | PHP Hacker   | Javascript Hacker   | Java Hacker   | GIS Research   | 
| AAA+   | VBA   | Epic Games   | Fboss Technology   | 


 
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
           
  	       
           
           
  	       
  	       
           
           
           
           
  	       
           
           
           
           
  	       
           
           
           
           
  	       
           
           
           
           
           
           
           
  	       
           
  	       
           
           
  	       
           
  	       
           
           
  	       
           
  	       
           
           
           
  	       
           
           
           
  	       
           
  	       
           
  	       
           
           
  	       
           
  	       
           
           
  	       
           
  	       
           
           
  	       
          