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Back End Developer

Software Engineering



$75,000 - $150,000

About Company:

Kleros is an Ethereum based autonomous organization that works as a decentralized third party to arbitrate disputes. It relies on game-theoretic incentives to have jurors rule cases correctly. The result is a dispute resolution system that renders ultimate judgments enforced by smart contracts in a fast, inexpensive, transparent, and decentralized way.

Job Description:

You will be part of Kleros’ software development team, working closely with the team on open source code. You will develop software needed for Kleros 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. You will spend most of your time as the project owner of the server side magic that makes Kleros work. All of our projects use the blockchain as the source of truth, but there are many backend challenges that are crucial to the Kleros ecosystem. You will take on projects that interact with the blockchain, support the user experience, use decentralized protocols, and handle important off-chain data. There are also opportunities to get involved with smart contract development and product development. The Ethereum ecosystem is innovating quickly; so above all, you will be learning new things all the time.


  • Back-end development using Node, Python, Go or a language of your choice.

  • AWS infrastructure maintenance.

  • Developing software to interact with the Ethereum blockchain.

  • Architect, build and maintain a sustainable backend server infrastructure.

  • Taking responsibility for improving and maintaining existing projects.

  • Interfacing with and supporting our front-ends decentralized applications.


  • Experience with Node, Python, Go, and AWS.

  • A previous blockchain experience is not necessarily required but candidates should be able to demonstrate a blockchain interest (read blog posts / scientific articles, tried dapps on mainnets or testnets).

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