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Senior Smart Contract Engineer

February 26, 2026

Circle (NYSE: CRCL) is one of the world’s leading internet financial platform companies, building the foundation of a more open, global economy through digital assets, payment applications, and programmable blockchain infrastructure. Circle’s platform includes the world’s largest regulated stablecoin network anchored by USDC, Circle Payments Network for global money movement, and Arc, an enterprise-grade blockchain designed to become the Economic OS for the internet. Enterprises, financial institutions, and developers use Circle to power trusted, internet-scale financial innovation. Learn more at <a target="_blank" href="http://circle.com/">circle.com</a>.What you’ll be part of:Circle is committed to visibility and stability in everything we do. As we grow as an organization, we're expanding into some of the world's strongest jurisdictions. Speed and efficiency are motivators for our success and our employees live by <a target="_blank" href="http://careers.circle.com/us/en/#working-at-circle">our company values</a>: High Integrity, Future Forward, Multistakeholder, Mindful, and Driven by Excellence. We have built a flexible work environment where new ideas are encouraged and everyone is a stakeholder.What you’ll be responsible for: We are looking for a Smart Contract Engineer to design, implement, test, and maintain production-grade smart contracts across multiple blockchain ecosystems. This role focuses primarily on EVM-based Solidity contracts and Solana programs written in Rust using the Anchor framework. As a Smart Contracts Engineer, you’ll be responsible for building secure and efficient smart contracts that power Circle’s core protocols. You’ll work closely with protocol, infrastructure, and security engineering teams to deliver high-assurance, auditable code that supports scalable, blockchain-based services across ecosystems. This is a high-impact opportunity to shape the future of programmable finance.What you'll work on: <ul><li>Design, implement, and deploy smart contracts for EVM and Solana using Solidity and Rust</li><li>Write comprehensive unit, integration, and property-based tests for contract logic</li><li>Research industry-standard design patterns and emerging trends in smart contract development</li><li>Optimize smart contract performance, including gas efficiency and runtime behavior</li><li>Collaborate with security teams on audits, threat modeling, and remediation strategies</li><li>Conduct code reviews and contribute to best practices for smart contract engineering</li><li>Monitor deployed contracts and support incident response as needed</li></ul>What you’ll bring to Circle: Core Requirements:<ul><li>Proficiency in designing and writing production-grade smart contracts with a focus on security, gas optimization, and performance benchmarking in Solidity and/or Rust</li><li>Strong understanding of blockchain architecture, EIP standards, decentralized systems, and on-chain execution</li><li>Solid grasp of smart contract security principles, including common vulnerabilities such as reentrancy, access control, and arithmetic errors</li><li>Familiarity with smart contract testing frameworks such as Foundry, Hardhat, or Anchor</li><li>Strong collaboration skills with the ability to work cross-functionally with product, infrastructure, and security teams</li></ul>Preferred Requirements:<ul><li>Experience shipping or operating multi-chain or cross-chain smart contract systems, with familiarity in Web3 fintech or DeFi environments</li><li>Experience contributing to or auditing open-source smart contracts or blockchain protocols</li><li>Experience developing smart contracts for non-EVM chains</li></ul>Circle is on a mission to create an inclusive financial future, with transparency at our core. We consider a wide variety of elements when crafting our compensation ranges and total compensation packages.Starting pay is determined by various factors, including but not limited to: relevant experience, skill set, qualifications, and other business and organizational needs. Please note that compensation ranges may differ for candidates in other locations.We are an equal opportunity employer. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status, or any other protected status required by the laws in the locations where we hire. Additionally, Circle participates in the <a target="_blank" href="https://6778953.fs1.hubspotusercontent-na1.net/hubfs/6778953/PDFs/E-Verify_Right_to_Work.pdf">E-Verify Program</a> in certain locations, as required by law.Should you require accommodations or assistance in our interview process because of a disability, please reach out to <a target="_blank" href="mailto:accommodations@circle.com">accommodations@circle.com</a> for support. We respect your privacy and will connect with you separately from our interview process to accommodate your needs.#LI-Remote

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Common Interview Questions And Answers

1. HOW DO YOU PLAN YOUR DAY?

This is what this question poses: When do you focus and start working seriously? What are the hours you work optimally? Are you a night owl? A morning bird? Remote teams can be made up of people working on different shifts and around the world, so you won't necessarily be stuck in the 9-5 schedule if it's not for you...

2. HOW DO YOU USE THE DIFFERENT COMMUNICATION TOOLS IN DIFFERENT SITUATIONS?

When you're working on a remote team, there's no way to chat in the hallway between meetings or catch up on the latest project during an office carpool. Therefore, virtual communication will be absolutely essential to get your work done...

3. WHAT IS "WORKING REMOTE" REALLY FOR YOU?

Many people want to work remotely because of the flexibility it allows. You can work anywhere and at any time of the day...

4. WHAT DO YOU NEED IN YOUR PHYSICAL WORKSPACE TO SUCCEED IN YOUR WORK?

With this question, companies are looking to see what equipment they may need to provide you with and to verify how aware you are of what remote working could mean for you physically and logistically...

5. HOW DO YOU PROCESS INFORMATION?

Several years ago, I was working in a team to plan a big event. My supervisor made us all work as a team before the big day. One of our activities has been to find out how each of us processes information...

6. HOW DO YOU MANAGE THE CALENDAR AND THE PROGRAM? WHICH APPLICATIONS / SYSTEM DO YOU USE?

Or you may receive even more specific questions, such as: What's on your calendar? Do you plan blocks of time to do certain types of work? Do you have an open calendar that everyone can see?...

7. HOW DO YOU ORGANIZE FILES, LINKS, AND TABS ON YOUR COMPUTER?

Just like your schedule, how you track files and other information is very important. After all, everything is digital!...

8. HOW TO PRIORITIZE WORK?

The day I watched Marie Forleo's film separating the important from the urgent, my life changed. Not all remote jobs start fast, but most of them are...

9. HOW DO YOU PREPARE FOR A MEETING AND PREPARE A MEETING? WHAT DO YOU SEE HAPPENING DURING THE MEETING?

Just as communication is essential when working remotely, so is organization. Because you won't have those opportunities in the elevator or a casual conversation in the lunchroom, you should take advantage of the little time you have in a video or phone conference...

10. HOW DO YOU USE TECHNOLOGY ON A DAILY BASIS, IN YOUR WORK AND FOR YOUR PLEASURE?

This is a great question because it shows your comfort level with technology, which is very important for a remote worker because you will be working with technology over time...

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