Polkadot Interview Questions - Hard

calendarDec 14, 2025 · 1 min read · polkadot blockchain interview hard optimization architecture  ·
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Hard-level Polkadot interview questions covering advanced optimization and complex parachain design.

Q1: How do you implement advanced runtime upgrades?

Answer:

Runtime Upgrades:

1pub struct CustomUpgrade;
2
3impl OnRuntimeUpgrade for CustomUpgrade {
4    fn on_runtime_upgrade() -> Weight {
5        // Migration logic
6        // Return weight consumed
7        Weight::from_parts(1000, 0)
8    }
9}

Q2: How do you optimize parachain block production?

Answer:

Block Production Optimization:

  • Parallel transaction processing
  • State caching
  • Batch operations
  • Limit storage operations

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