Design a distributed scheduler that executes large DAG-based workflows with strict dependency tracking, retry isolation, and multi-region control.
Why now
Introduces workflow reliability and dependency correctness in distributed control planes.
Skills learned
DAG scheduling semanticsRetry/backoff policyIdempotent execution
Step 4UpcomingadvancedPremium
Ticket Booking & Seat Reservation System
Design a high-concurrency ticketing system with seat holds, anti-oversell guarantees, payment flows, and event surge handling.
Why now
Stress-tests transaction design, lock contention handling, and abuse controls.
Skills learned
Hot partition mitigationReservation correctnessBot/fairness controls
Step 5UpcomingadvancedPremium
Control Plane for Multi-Region Kubernetes Clusters
Design a global Kubernetes control plane that manages desired state, policy, and rollout safety across many regional clusters with strict reliability and consistency guarantees.
Why now
Targets multi-region leadership, convergence, and control-plane availability tradeoffs.
Skills learned
Control loop designRegional failoverOperational blast-radius management
Step 6UpcomingadvancedPremium
Ephemeral Sandbox Execution Platform
Design a secure, high-throughput platform that runs untrusted code in short-lived sandboxes with strict isolation, low cold-start latency, and global scale.
Why now
Finalizes reliability trajectory with isolation and execution safety under adversarial workloads.