Hire vetted Solidity engineers
Hire Solidity engineers who write smart contracts that survive audits and adversaries
Grape5 places pre-vetted, India-based Solidity engineers on your team to design, test, and ship EVM smart contracts that hold user funds and cannot be patched after deploy. Each is screened on live code, system design, and communication, dedicated to your product, and backed by us with a free replacement if the fit is wrong.
In short
Grape5 places pre-vetted, India-based Solidity engineers on your team to design, test, and ship EVM smart contracts that hold user funds and cannot be patched after deploy.
Each is screened on live code, system design, and communication, dedicated to your product, and backed by us with a free replacement if the fit is wrong.
When to hire Solidity developers
- You are launching a DeFi protocol (lending, staking, or an AMM) and need production contracts written, tested, and prepared for a third-party audit before mainnet.
- You have a live protocol and need an upgrade through a proxy pattern without corrupting existing storage layout or locking user funds.
- You are shipping a token with vesting schedules, an airdrop, and on-chain governance, and cannot afford a mint bug or a broken timelock.
- You are adding on-chain escrow or payments to an existing web2 product and need the contracts, the event indexing, and the backend integration to line up.
How we vet Solidity developers
Every engineer we put forward is screened by a senior Grape5 engineer before you meet them. For Solidity developers, we look specifically at:
- Reentrancy under pressure: we make them find the vulnerable external call in a sample contract and defend checks-effects-interactions versus a nonReentrant guard, not just recite the SWC list.
- Upgradeability: storage layout collisions, delegatecall, initializer versus constructor, and the tradeoffs between transparent and UUPS proxies before they touch a live deployment.
- Real tests: Foundry or Hardhat fuzzing and invariant tests, mainnet forking for integrations, and coverage on the failure paths, not only the happy path.
- Gas and safety judgment: where an unchecked block is actually safe, custom errors versus require strings, and unbounded loops that open a griefing or DoS vector.
- Economic attack surface: oracle price manipulation (spot versus TWAP), front-running and MEV, and slippage handling on swaps.
Grape5 vs a freelancer marketplace
Grape5
- Who the engineer works for
- Vetted, dedicated, and backed by Grape5 for your engagement.
- Vetting
- Screened by our own senior engineers, code, system design and communication, before you ever meet them.
- Timezone
- 4+ hours of daily overlap with your US working hours, in your tools and standups.
- If it isn't working
- We replace them from the bench, usually within days, at no extra cost.
- Continuity
- The same team, retained and growing with your product.
A freelancer marketplace
- Who the engineer works for
- An independent contractor juggling several clients at once.
- Vetting
- Self-reported skills, a résumé and a star rating.
- Timezone
- Whatever hours the contractor decides to keep.
- If it isn't working
- You re-post the role and start the search from scratch.
- Continuity
- Churn between contracts, the context leaves when they do.
| Grape5 | A freelancer marketplace | |
|---|---|---|
| Who the engineer works for | Vetted, dedicated, and backed by Grape5 for your engagement. | An independent contractor juggling several clients at once. |
| Vetting | Screened by our own senior engineers, code, system design and communication, before you ever meet them. | Self-reported skills, a résumé and a star rating. |
| Timezone | 4+ hours of daily overlap with your US working hours, in your tools and standups. | Whatever hours the contractor decides to keep. |
| If it isn't working | We replace them from the bench, usually within days, at no extra cost. | You re-post the role and start the search from scratch. |
| Continuity | The same team, retained and growing with your product. | Churn between contracts, the context leaves when they do. |
Related roles you can hire
Pre-vetted engineers across adjacent skills, dedicated to your product and your US working hours.
Frequently asked questions
Fair concern. We screen specifically for adversarial thinking: reentrancy, access control, and economic attacks, not just whether the code compiles. Beyond that, treat process as your safety net with testnet runs, an independent audit before mainnet, a staged rollout, and multisig control. Every engineer is dedicated to your product and backed by Grape5, with a free replacement if the fit is wrong.
Both, if that is what you need. Upgrades and migrations are harder than greenfield because a storage collision or a broken proxy can lock funds, so we screen for proxy patterns, storage layout, and initializer discipline. Tell us the exact situation and we match an engineer who has done that kind of work, rather than promising a generalist fits every job.
No, and we will not pretend otherwise. Development and thorough testing reduce risk but do not replace an independent audit by a dedicated firm. Our engineers write with auditability in mind, keep contracts small and readable, and work directly with your auditors to close findings. Budget for a separate audit before any contract holds real value.
A typical start is 2 to 3 weeks, depending on the role and your interview steps. Engineers are India-based and keep at least 4 hours of daily overlap with US working hours, which covers standups, pairing on a tricky contract, and same-day review during a launch window.
Neither a freelancer nor a marketplace listing. Grape5 vets, dedicates, manages, and backs the engineer, so you are not on your own if something goes sideways. The engineer is committed to your product for the engagement, and if the fit is wrong we replace them for free. Cost is scoped per role and engagement.
Tell us the role. Get vetted profiles.
Send us the seniority and stack you need. We’ll come back with a shortlist of vetted Solidity developers who’ve shipped it, and a plan to start in 2 to 3 weeks.