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Ethereum Smart Contract Developer (Solidity) - Blockchain/LegalTech/FinTech

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Clément is hiring for Coopérative Kleros
February 21, 2021

A decentralized court system for dispute resolution in blockchain

** Who Are We? **

Kleros is a tight-knit team, supported by a large community, that works together to democratize access to justice using cutting edge technologies. We are deeply integrated with the Ethereum ecosystem, but our mission transcends it.

Our core is a blockchain-based decentralized protocol that crowdsources arbitration. In other words, an online court system, secured by cryptography and game theory. Check out our website to learn more (kleros.io).

We are community leaders, crypto- economists, designers, engineers, makers, mathematicians, thinkers, and writers. Our tasks are incredibly varied and exciting. Building a digital justice system and integrating with applications comes with all the usual challenges of your favorite tech companies plus so much more!

** Who Are We Looking For? **

We’re proud to have created an environment where everyone feels safe speaking their minds, and everyone is heard and considered. Collective thinking is the best way for everyone to succeed.

We place a lot of trust in each other, and we have flexible work schedules. You are welcome to relocate to work out of the Lisbon’s office, but almost all of our team works remotely.

Ultimately, this means we look for exceptional people who will share our vision. We compensate them competitively and ensure they are motivated to succeed and grow together. The % indicated in the `Equity Range` field corresponds to a PNK token allocation. You will also get voting rights in the Kleros Cooperative.

Job Description


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.

Skills 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.


We offer competitive pay for extraordinary people. The % indicated in the Equity Range field corresponds to a PNK token allocation. You will also get voting rights in the Kleros Cooperative.

Salary range: $50k-$100k 

Equity range: 0.05% - 0.1% 


You can either come to the Lisbon office or work fully remotely. In either case, main work jurisdiction is Github and Slack.

Want to Apply? 

Make an intro and provide answers to the screening questions.

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


📍 France - Lisbon - Remote
🌎 Remote
🛠 Engineering
We pay in crypto
📆 Full-time
👔 Contractor
Apply now
6 applications
Posted on February 21, 2021

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