BlockChain 121

Senior Solidity Engineer, Remote, Europe, Up to $150k plus tokens, DeFi

European Union

Up to $150k plus tokens

My client are a true leader in the DeFi space and they are looking for a hands on Senior Solidity Engineer to take them on the next step of their journey. You’ll champion the business as a Senior Solidity Engineer and across the broader crypto world as they grow their radically innovative DeFi protocol.

As they are a small (10) team, you will have the opportunity to shape the role into your own and recommend / lead improvements in other areas of the business if you wish.

Utilize your Defi knowledge and experience to be their Solidity lead and contributing to the development of their protocol
Ensure proper functioning and upgrading of the current infrastructure
Work in a collaborative team environment to seek best practices and maintain internal and external professional relationships with the operational teams
Work with their CTO to develop tactical and technical solutions and execute on selected features
Collaborate closely with different engineering leads, products managers and leadership to continuously improve and progress the quality
Design and develop smart contracts and Defi applications on the Ethereum blockchain
Write high-quality, reusable and efficient code in Solidity
Review code and provide feedback to other developers to ensure high quality standards
Conduct thorough code reviews, testing and debugging to ensure the software is up-to-date, efficient and secure
Stay up-to-date with the latest trends and technologies in blockchain, Defi and distributed ledgers to constantly challenge and improve the quality of the protocol
Implement and build state of the art, reliable and workable code
Own and shape the core of the v1 of the protocol
Work closely with our Simulation team to ensure a fluid and transparent liaison between the protocol and its Python Simulation
You’ll have:

An Engineering Degree in Software, Computer, Electrical or similar field.
At least two years experience developing public Ethereum smart contracts.
At least two years of experience working in Defi
Discipline to create systems that are robust, safe and efficient.
An extreme thoroughness in your approach (and need) to understand the low-level, end-to-end details.
Knowledge of what can go wrong and you’ve learned a lot of painful lessons developing applications for mainnet.
The aptitude to dive into the detail and see how the EVM performs with short bursts of research and development to squeeze the best out of the system design.
A natural structured approach to work-breakdown and task management.
Experience working with agile project management methods and tooling.
A strong source code management skill using Git / GitHub / GitLab
A strong smart contract testing experience (Hardhat / Brownie / Typescript / static analysis tools)
A proficiency in writing and speaking English.
Key relationships / stakeholders

You will report to the Chief Technology Officer. The internal team leads will be your key stakeholders along with external partners who currently provide services / advice. You will be in regular contact with other team members such as Tech Lead and Ops Manager to coordinate scope of work.

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Frequently Asked Questions

Blockchain 121 is a recruitment and talent management firm specialising in the Web3 and crypto industry. Since 2019, we have built a robust network and deep expertise in this space, helping emerging startups and established players secure top talent. Our focus is on connecting companies with the right individuals with the rare skills required to thrive in the dynamic world of decentralisation.

We provide end-to-end recruitment and talent solutions tailored specifically for the Web3, blockchain and crypto sectors. Our services include sourcing and placing skilled engineers proficient in Rust, Solidity, Golang, ZK, AI and protocol development, as well as connecting businesses with top-tier C-suite executives and business development experts. We also offer a unique Candidate Showcase that highlights our curated network of highly sought-after professionals who are available for hire, providing exclusive access to individuals who are not actively pursuing roles publicly.

Blockchain 121 stands out by being a specialist recruiter who truly lives and breathes Web3. With five years of focused experience in the blockchain industry, we have developed an extensive network and unparalleled knowledge of the talent market. Unlike others, we don’t rely on traditional advertising—our reputation and proven track record drive all our business through referrals. Our deep industry connections, including close ties with leading VCs, unicorns, and startups, allow us to provide precise, efficient talent solutions that convert recruitment into tangible business growth.

Blockchain 121 covers a diverse range of industries within the Web3 and crypto ecosystem. We work with blockchain startups, decentralised finance (DeFi) platforms, non-fungible token (NFT) projects,  zero-knowledge (ZK) protocols and companies at the forefront of decentralising AI. Our expertise also extends to supporting large enterprises and Fortune 500 companies looking to integrate blockchain technologies, such as Warner Music Group. Whether it’s a startup building a technical team or a major corporation hiring strategic leaders, we have the knowledge and network to meet their needs.