Solana Interview Questions - Hard

calendarDec 14, 2025 · 1 min read · solana blockchain interview hard optimization architecture  ·
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Hard-level Solana interview questions covering advanced optimization, security, and complex program design.

Q1: How do you implement advanced account compression and state optimization?

Answer:

State Compression:

 1// Use Merkle trees for state
 2use merkle_tree::MerkleTree;
 3
 4pub struct CompressedState {
 5    tree: MerkleTree,
 6    root: [u8; 32],
 7}
 8
 9// Store only root on-chain
10// Reconstruct from off-chain data

Q2: How do you implement MEV protection and transaction ordering?

Answer:

MEV Protection:

 1// Use commit-reveal scheme
 2pub struct CommitReveal {
 3    commitment: [u8; 32],
 4    reveal: Option<Transaction>,
 5}
 6
 7// Commit phase
 8pub fn commit(ctx: Context<Commit>, hash: [u8; 32]) -> Result<()> {
 9    // Store commitment
10}
11
12// Reveal phase
13pub fn reveal(ctx: Context<Reveal>, tx: Transaction) -> Result<()> {
14    // Verify commitment matches
15    // Execute transaction
16}

Q3: How do you optimize for parallel execution?

Answer:

Account Locks:

1// Mark accounts as writable/readable
2pub struct AccountMeta {
3    pubkey: Pubkey,
4    is_signer: bool,
5    is_writable: bool,
6}
7
8// Transactions with non-overlapping accounts execute in parallel

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