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Ethereum Smart Contract Developer (Solidity)
at Kleros
over 1 year ago | 1383 views | 35 applications

Ethereum Smart Contract Developer (Solidity)

France, Lisbon, Remote
Per year
$75,000 To $150,000

About the company

Kleros is a decentralized arbitration protocol that uses blockchain, game theory and crowdsourcing to solve a wide range of disputes. The Cooperative Kleros, the company that kickstarted the development of the Kleros protocol, is a widely recognized name in the blockchain and legaltech industries with a highly skilled engineering and research teams. As a fast growing company in a highly innovative industry, Kleros has a wide range of open positions in engineering, management and communications positions. To learn more about Kleros, check our website (, read our white paper ( or our book Dispute Revolution (

Job Summary

Are you passionate about decentralization and building the new governance systems that will make the old ones obsolete? If so, read on.

What Will You Do?

You will be part of Kleros’ software development team, working closely with the team on open source code. You will develop smart contracts needed for Kleros and dapps integrated to run: write code, participate in code reviews, conduct tests and deal with potential bugs and vulnerabilities reported through our bug bounty programs and audits.

Smart contract being critical pieces of software, you will need to follow rigorous security processes. You will need an extremem attention to details. Keeping up to date with solidity and new vulnerability types will be crucial.

The Ethereum ecosystem is innovating quickly; so above all, you will be learning new things all the time.

Skill Required:

Solidity. Understanding of basic cryptographic tools (hash functions, asymetric cryptography, merkle trees, etc). General Computer Security skills (computer security classes, participation in CTFs, earning bug bounties, etc).

Appreciated Knowledge:

Vyper. Ethereum Virtual Machine and Inline Assembly. Ethereum scalability tools currently being developed. Cross-chain communication methods. Basic understanding of economy and game theory. Perks

Most of the compensation (2/3) is labelled in fiat and paid in crypto. The remaining (1/3) is labelled in PNK vested over 3 years with a 1 year cliff ensuring you get a stake in the project. We are a cooperative, so as a worker you own part of the company and get voting rights. Want to Apply?

Send us an intro answering the following questions:

  1. How and where do you like to work?

  2. What is the most interesting problem you’ve worked on?

  3. Why do you think you are a good fit for this role?

  4. What is the address of the KlerosLiquid smart contract on the mainnet that uses and the value of its maxDrawingTime variable? Let’s test your sleuthing skills!

Feel free to include anything else you think is relevant for us to look at.

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