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Kosen Labs
California San Jose United States


Note: This is a fully remote position, since we are a globally remote team.

About Kosen Labs

We are a team of ex-Google DeepMind AI researchers and engineers with extensive experience in designing and implementing cutting edge solutions to machine learning and numerical optimisation problems.

The mission of Kosen Labs is to bring the benefits of AI & advanced optimization to the DeFi space and beyond, all while keeping entry barriers low for the end user and allowing everyone to partake in the new decentralised economy.

We are funded by top-tier Silicon Valley and crypto-native VCs, such as Andreessen Horowitz and Framework Ventures.

The role

We are looking for an ambitious Head of Blockchain Engineering to lead the growth and development within the Kosen Labs Blockchain Engineering team. As a Head of Blockchain Engineering you will architect and build secure smart contract protocols and backend services to connect users with the Kosen ML ecosystem. The work will initially focus on the major DeFi protocols, primarily different AMMs and derivative protocols. You will also mentor and train junior team members on smart contract best practices, and your responsibilities might also involve hiring new team members and further building out the engineering function.

Key Responsibilities

Working independently on software development tasks;
Reviewing specifications produced by architects and protocol directors;
Contributing to the design of algorithms;
Writing clean, straightforward, efficient code that satisfies acceptance criteria and specifications;
Committing and submitting frequently small pull requests;
Fixing bugs in your own code and in legacy code from others;
Troubleshooting, debugging and upgrading existing software;
Writing documentation for the code.


Skills and Experience

General knowledge of blockchain technology;
Proven 5+ years of experience in software or hardware engineering;
At least 2-3 years of Solidity development experience;
Good knowledge of Solidity development frameworks like Truffle, Ganache, Tenderly, Hardhat;
Understanding of server-side programming using Geth;
Experience with Open Zeppelin libraries;
Experience using TDD methodologies;
Basic financial knowledge;
Strong numerical skills and knowledge of safe math;
Strong sense of security;
Solid knowledge of blockchain exploits.

Nice to have

Knowledge of Solidity security testing tools like Slither, Mythril;
Experience with DeFi protocols;
Quant finance background;
Basic understanding of machine learning technology.

Personal Qualities

Strong leadership qualities and interpersonal skills;
Excellent verbal and written communication skills;
Rigorous attention to detail and a desire to deliver high-quality work;
Self-motivated with a passion for continuous improvement and learning;
Willingness to adapt to a variable role and a great can-do attitude.


Very competitive salary;
Equity and token allocation;
Remote-first, flexible, and fun working environment;
Unlimited time off;
A new shiny laptop for your role;
Occasional paid travel costs to conferences and off-sites.

Kosen Labs focuses on Artificial Intelligence and Blockchain / Cryptocurrency. Their company has offices in Lisbon. They have a small team that's between 11-50 employees.

You can view their website at https://kosen.ai or find them on Twitter.