Java Backend Developer

Location: Gurgaon

Mode of working: Work from office (5 days a week)

Key Responsibilities:

• Designs / implements a HTTPS/TLS based push server (located between mobile devices and a service server) to push data to the mobile devices through a secure communication channel
• Design, implement, and maintain integration with Google FCM/Apple APNS
• Develop and expose RESTAPIs  that allow the server to send messages via FCM and APNS.
• Deploy and manage an in‑memory data store  (e.g., Redis) to share and persist device authentication data across push‑server instances.
• Conduct  performance testing (JMeter) , profile resource usage, and refactor code to improve throughput, latency, and CPU/memory efficiency.
• Architect and configure  high‑availability clustering of push servers, ensuring they share a common message‑queue (e.g., Kafka, RabbitMQ ) for load balancing and fail‑over.
• Good to have - Hands on experience on ReactJs .