Principal web3 Solidity Engineer London London

At Improbable, we believe that the next revolution in entertainment and society will come from massive virtual worlds. They will create new economies and opportunities globally, changing not just how we play, but how we work and relate to each other. That’s why we’ve made it our mission to build the next generation of technologies for online multi-user games and simulations.

At Improbable, you are surrounded by people who want to improve everything and everyone around them, and who compel you to improve yourself. We’re motivated by the fulfilment of solving hard problems to achieve something profound and transformative.

Improbable is a Venture Builder. We are working with leaders to create businesses in AI transformation, the metaverse and web3. We both create businesses from scratch and invest in existing businesses. Our central services teams work with ventures to help them achieve success; including early stage prototyping and initial product development where this role sits.

Your Mission

As a Principal web3 Solidity Engineer at Improbable, you will work with web3 Ventures to help them get to market faster. You will work with their leadership team to design, prototype, and launch initial versions of their dApps. This is a hands-on, strategic role where you will collaborate with executives, working from identifying customer problems to shipping real dApps used in the community.

What You’ll Be Doing

• Architect, build, launch, and maintain dApps — from concept to being used by the community.
• Build on-chain logic in smart contracts, and connect them to web front-ends used by crypto natives and novices.
• Work with business leads to define the product roadmap, help set the vision and strategy for the venture, and act as a sounding board for venture leadership.
• Collaborate closely with the Somnia Blockchain team, providing product feedback to their developers.

Why You’re Made For This

We are seeking an experienced Web3 Engineer with expertise in EVM-based smart contracts on Solidity, Web3 JS/TS libraries for contract interactions, and experience with The Graph. You should have strong hands-on skills with the blockchain development framework Foundry. You’ve shipped web applications built with TypeScript (preferably React, Next.js) and used wagmi hooks for smart contract integrations. You possess a deep understanding of blockchain architecture, token standards (ERC-20, ERC-721, ERC-1155), and non-standard versions (e.g., USDC). Knowledge of Solidity best practices and common security vulnerabilities is essential. You thrive when solving complex, ambiguous problems and enjoy working across disciplines to find the best solutions. You are passionate about the web3 community.

Optional skills

The following technical experience is helpful but not essential:

• Experience using The Graph protocol to create Subgraphs or designing smart contracts for optimal indexability.
• Experience in the DeFi ecosystem, particularly swapping protocols (e.g., Uniswap V2 or V3) and lending protocols (e.g., AAVE).
• Awareness of Solidity fuzz testing, Slither, and Mithril.
• Experience with the Hardhat testing framework.

While the above experience could be important, we’re keen to hear from candidates who believe they have valuable experience to bring to the role. If you identify with the team and mission, but not all requirements, please still apply.