Web3 Solidity UI/UX Jobs

About Sapien

We're not just building a company; we're creating new opportunities in AI development and data labeling. You'll play a key role in shaping the future of how humans and AI collaborate.

Join a disciplined and rigorous team building cutting-edge technology featuring gamification, beautiful UI, and a clean, well-documented codebase.

The Role: Staff Web3 Engineer

Sapien is seeking a Staff Web3 Engineer to take a lead role in architecting and accelerating the development of our blockchain-integrated systems. This is an ideal opportunity for a senior engineer who thrives in a fast-moving, remote-first environment and values both ownership and collaboration.

We’re looking for a full-stack expert with deep experience in smart contract development (EVM) and web2/database-driven applications. You’ll help drive technical strategy, mentor developers, and ensure smooth integration between smart contracts, APIs, and frontend experiences.

Key Responsibilities:

* Architect, build, test, and deploy smart contracts to testnets and mainnets

* Lead web3 integrations with partners and contribute to go-to-market efforts alongside the business team

* Guide and review React frontend implementations that interface with smart contracts

* Ensure a clean, maintainable, and well-tested codebase

* Support cross-functional teams with technical decision-making and unblock teammates when needed

An ideal candidate will:

* Operate independently and confidently at a senior level, while collaborating effectively with designers, engineers, and product leads

* Have deep experience with smart contract development (Solidity or similar) and familiarity with security best practices

* Be highly proficient in full-stack engineering, including backend development and working with relational databases like Postgres

* Have a strong eye for UI/UX and be able to make informed design and implementation decisions when specs are incomplete

* Know how to balance speed and quality, delivering clean code that’s tested and documented

* Understand the performance implications of frontend/backend architecture and build responsive, performant applications

* Be a clear communicator who knows when to ask questions, raise flags, or offer guidance

Why Join Sapien?

At Sapien, you’ll be part of a vibrant and innovative team dedicated to making a real impact in the AI ecosystem. We value creativity, autonomy, and craftsmanship. As a Staff Engineer, your contributions will shape the direction of our technology and culture. If you’re passionate about building scalable, elegant systems at the intersection of web2 and web3, we’d love to hear from you.

Apply now to become a key player in advancing Sapien’s mission!