Smart Contract Development
Solidity to Solana
Updated
Smart contracts are code that handles real money with no undo button. I have built production smart contracts across Ethereum and Solana — from ERC-20 token systems with KYC-gated transfers to NFT marketplace programs handling minting, bidding, and settlement. The unforgiving part is that deployed contracts are immutable. You audit before you ship, or you lose funds after.
What This Means for Your Business
The difference between Ethereum and Solana smart contracts is not just the language — it is the execution model. Ethereum contracts store their own state and execute synchronously. Solana programs are stateless, receive accounts as inputs, and process instructions in parallel. Choosing the wrong chain for your use case creates architectural constraints you cannot fix later without rewriting.
If you are launching a token, building an NFT marketplace, or creating any on-chain financial product — the contract architecture determines your gas costs, upgrade path, and vulnerability surface. You need someone who has shipped contracts that handle real value on both EVM and Solana runtimes.
How I Have Used This in Production
Solana NFT Marketplace Programs
Developed Rust smart contracts for Solana's Metaplex NFT marketplace — minting, listing, bidding, and settlement. Solana's account model required a different mental model from EVM: each NFT is an account, each listing is an account, and the program processes them as inputs.
KYC-Gated ERC-20 Token
Implemented ERC-20 compliant smart contracts for tokenized investment funds with KYC/AML verification built into the transfer function. Non-whitelisted addresses cannot receive tokens — enforced at the contract level, not the application level.
Privacy-Preserving Transaction Layer
Built the smart contract layer for private transactions using zero-knowledge proofs. The contract verifies zk-SNARK proofs on-chain while the transaction details — sender, receiver, amount — remain confidential. Only the proof of validity is public.
Technologies
Related Expertise
The privacy-preserving contract layer verifies ZK proofs on-chain. See how I built the full proving pipeline from Circom circuits to Solidity verifier.
ZK-SNARK Development — From Circuits to Production WalletsSolana contracts are Rust. The client-side libraries that talk to them are also Rust, compiled to WASM for the browser.
Rust and WebAssembly — Native Performance in the BrowserWhen contracts need to operate across chains, the abstraction layer must handle different gas models, finality, and signing schemes.
Cross-Chain Protocols — Connecting BlockchainsFrequently Asked Questions
What is smart contract development, and why is it unforgiving?
Smart contracts are code that handles real money with no undo button. Once deployed, contracts are immutable — bugs become permanent and exploits drain funds directly. This inverts normal software practice: you audit before you ship, or you lose funds after. Contract architecture also determines gas costs, upgrade paths, and vulnerability surface, so decisions made before deployment define the economics and security of the product for its entire life.
How should a team choose between Ethereum and Solana for smart contracts?
The difference between Ethereum and Solana is the execution model, not just the language. Ethereum contracts store their own state and execute synchronously; Solana programs are stateless, receive accounts as inputs, and process instructions in parallel. Choosing the wrong chain for a use case creates architectural constraints that cannot be fixed later without rewriting. Teams should evaluate their state model and concurrency needs against each runtime before writing any code.
What production smart contract experience does Oleksii Vasylenko have?
Oleksii Vasylenko has shipped production smart contracts on both Ethereum and Solana. He developed Rust programs for Solana's Metaplex NFT marketplace covering minting, listing, bidding, and settlement at Kobvel Software Consulting. At Xen Technologies he implemented ERC-20 contracts for tokenized investment funds with KYC/AML verification enforced inside the transfer function itself. At Panther Protocol he built the smart contract layer that verifies zk-SNARK proofs on-chain while keeping transaction details confidential.
What goes wrong when teams build smart contracts?
The fatal mistake is treating deployment like normal software releases. Deployed contracts are immutable, so vulnerabilities cannot be patched — they can only be exploited. Teams also enforce critical rules at the application level instead of the contract level; Oleksii's KYC-gated ERC-20 work shows the correct pattern, blocking non-whitelisted transfers inside the contract itself. A third failure is porting EVM mental models to Solana, whose account-based, stateless program model requires fundamentally different architecture.
Can I hire Oleksii Vasylenko to review or build smart contracts before launch?
Yes — Oleksii works with teams launching on-chain products before they deploy, which is when contract review actually matters. He has shipped contracts handling real value on both Ethereum and Solana, from KYC-gated ERC-20 tokens to NFT marketplace programs and ZK proof verifiers, and knows where the vulnerabilities hide. Teams launching tokens, marketplaces, or on-chain financial products can reach him through ovasylenko.com to discuss contract architecture before deployment.
Further Reading
Launching something on-chain?
Smart contracts are immutable once deployed — bugs become permanent. I have shipped contracts handling real value on both Ethereum and Solana, and I know where the vulnerabilities hide. If you need contracts that survive contact with adversarial users, let's talk before you deploy.
Discuss your smart contract architecture