Senior Smart Contract Engineer

Full time - UK or Paris based
Kiln is now part of the prestigious French Government program #FT120 from La French Tech

• Design, develop, and deploy smart contracts on EVM-compatible blockchains: 6+ years of experience

• Write comprehensive and well-structured documentation for smart contracts and their functionalities.

• Write in-depth test suite including unit tests, e2e tests, fork tests & invariant tests using Foundry's best practices.

• Participate in audits related to the smart contract codebases.

• Provide technical guidance and mentorship to junior developers and team members.

• Participate in product governance and incident response processes with the rest of the team.

• Stay updated with the latest industry trends and technologies in blockchain and smart contract development.

• Collaborate with front-end and back-end developers to integrate smart contracts with web and mobile applications.

Stack:

• Smart-contract: Solidity + Foundry

• Proficient in Solidity and strong understanding of the Ethereum Virtual Machine (EVM).

• 6+ years of experience with smart contract development tools ideally including Foundry but any experience is valued (Truffle, Hardhat, Remix).

• Previous work with decentralized finance (DeFi) projects.

• Experience in conducting audits with top-tier auditing firms (Spearbit, Trail of Bits, Sigma Prime, …)

• Strong understanding of blockchain technology and decentralized architectures.

• Knowledge of smart contract security practices and common vulnerabilities.

• Excellent problem-solving skills and attention to detail.

• Strong communication and collaboration skills.

• Fluent (written and spoken) in English.

Nice-to-have

• Experience with Layer 2 scaling solutions such as Optimism, Arbitrum, Base, Zksync ...

• Contributions to open-source projects in the blockchain space.

• Smart contract related tooling skills for scripting purposes.

Kiln is the leading enterprise-grade rewards platform that enables institutional customers to stake assets and integrate staking & DeFi functionality into their offerings. Our API-first platform provides fully automated validators, staking & DeFi protocols access, and comprehensive data and commission management.

With $15+ billion in crypto assets staked through our platform, Kiln has established a strong presence on Ethereum, managing over 5.4% of the network through 50,000+ validators — all with zero slashing events.

Kiln serves more than 140 leading customers, including Binance, BitPanda, Bitgo, Fireblocks, VanEck, and TrustWallet.

Our team of 110 ecosystem enthusiasts brings experience from industry leaders like Google, Circle, Ledger, Chainalysis, and other prominent technology and cryptocurrency companies.

We've raised $30M in total funding from prominent investors including 1kx, , Illuminate Financial, Consensys, Wintermute, Kraken Ventures...

Join Kiln and help us make the web more secure, stable, decentralized, and fair

At Kiln, our values drive us: Technical Excellence ensures top security and usability; Innovation-Driven Meritocracy elevates groundbreaking ideas; Trust and Transparency build reliability through open communication; and People First keeps our team and clients at the heart of everything we do.

• A fast-paced, bureaucracy-free work environment

• Equity share options in the business: if Kiln succeeds, we all succeed

• Competitive salary

• Flexible holiday

• Flexible remote working

• Choose your IT equipment

• Internet connection: €50/month

• Significant personal development budget (books, training)

• Overseas tech conferences budget

Kiln is an Equal Opportunity Employer

We are committed to fostering an inclusive and diverse workplace where everyone is valued and respected. We welcome applications from all backgrounds, including women or persons with disabilities.

Our thorough process ensures the best fit for both you and Kiln, and we strive to make each step valuable and efficient.

1. Recruiter Interview (45 min)

2. Chat with Manager (30min)

3. Technical Interview (60 min)

4. Core Values Interview (45 min)

5. Founders Interview (30 min)

6. Offer

Your personal information will be securely stored in our Applicant Tracking System (ATS) and will not be shared with external parties. We comply fully with GDPR regulations to protect your data and privacy.

Please note that we do not sponsor visas for persons without work authorization in your location. This role is for full-time employees only (no B2B or contractors). Thank you