SDE III

Responsibilities:

• Scale the Core: Help build, scale, and maintain our real-time messaging engine, ensuring high availability even during traffic spikes.
• API Design: Build and document performant, secure APIs that power our mobile and web applications.
• System Design: Design systems that scale to millions of users messaging each other simultaneously.
• Network optimizations: Ensure maximum network throughput by optimizing every packet that gets transferred through the network.
• OS-level optimization: Optimize file descriptors and memory allocation to ensure maximum performance on each messaging server.
• Data Reliability: Optimize database queries and schema designs for lightning-fast message retrieval and archival.
• Security First: Implement and audit cryptographic protocols to ensure user privacy remains uncompromised.
• System Monitoring: Deploy and monitor microservices using automated pipelines, ensuring "five nines" (99.999%) uptime.

Requirements:

• Computer Science Enthusiast: You have a solid grasp of CS fundamentals, data structures, algorithms, and operating systems.
• Network Savvy: You understand how the internet actually works (TCP/UDP, TLS handshakes, and DNS).
• Curious and Scrappy: You have a GitHub full of side projects or a history of breaking (and fixing) things.
• Performance Obsessed: You hate bloat and constantly keep optimizing and simplifying even if not asked.

The Tech Stack:

• Languages: Java.
• Infrastructure: Distributed systems and Linux-based environments.
• Data: MySQL or Postgres and NoSQL (e. g., MongoDB and HBase/BigTable), and Redis (caching).
• DevOps: Docker, Kubernetes, and Prometheus/Grafana for observability.