Senior Solidity developers for blockchain and Web3 teams, based in the US

Frequently asked questions

Can one Solidity codebase support Ethereum and EVM L2 networks?

Often, but EVM compatibility does not mean identical operating conditions. Review supported opcodes, gas behavior, block timestamps, sequencer dependencies, and finality assumptions for each network. Use Foundry fork tests against the intended deployments and maintain explicit chain configurations. Cross-chain deployments also need separate address management, verification steps, and monitoring for privileged actions.

How should Solidity contracts validate cross-chain messages?

Validate the messaging endpoint, source chain, sender, and message identifier before executing an action. Define replay protection and how the receiver handles delayed, duplicated, or out-of-order messages. The bridge or messaging protocol adds its own trust assumptions, so testing should include paused delivery, failed execution, retries, and compromised permissions rather than only successful transfers.

How do you test staking and governance contracts with Foundry?

Use unit tests for individual rules, fuzz tests for varied inputs, and invariant tests for properties such as conserved accounting and restricted withdrawals. Advance time and blocks to exercise reward accrual, voting delays, and proposal execution. Fork tests help check external integrations, while adversarial test actors expose reentrancy paths and unexpected token behavior.

Should a blockchain protocol use UUPS or transparent proxies?

Choose based on upgrade authority, operational tooling, and how implementation contracts will be maintained. UUPS places upgrade logic in the implementation; transparent proxies separate administration through proxy behavior and associated tooling. Both require initializer protection, storage compatibility checks, and controlled upgrade permissions. Document the upgrade process and test it against existing state before deployment.

What should we prepare before interviewing a Solidity protocol developer?

Share the target chains, architecture diagram, contract repository, test suite, and known trust assumptions. Explain whether the work involves a new protocol, an upgrade, or remediation of audit findings. NextGen Coding Company signs an NDA and full IP assignment before touching code. Most teams interview matched engineers within a week of the first call.

Are your developers really based in the US?

Yes. Every engineer lives and works in the United States. No offshore subcontracting and no hand-offs to another team. That's written into the contract.

How fast can someone start?

Most teams interview matched engineers within a week of the first call. Start dates depend on your interview process.