About Crossmint

In the 2000s, the world came online. Now, it’s coming onchain—and we’re making it happen, faster.

Crossmint is a one-stop-shop developer platform for companies building onchain. We completely remove the complexity of building and using blockchain applications. Our platform provides all of the infrastructure companies need to build apps that scale to millions, without needing to orchestrate multiple vendors. It lets them create experiences that mirror the traditional web with familiar features like FaceID and email sign-ups, while eliminating gas fees and other friction points.

Our suite includes wallets, payments, onboarding, on/off ramps, tokenization, AI agent infrastructure, and other essential onchain building blocks, across 40+ blockchains.

We’re building a world where companies can get their entire blockchain backend, through a few lines of code, to build the next generation of the internet. Join us!

Location

🇺🇸 United States: Miami; New York

🇦🇷 Argentina: Buenos Aires

Type of employment

🇺🇸 United States: Full-time

🇦🇷 Argentina: Full-time employee (Contract through Deel)

Seniority

Senior (4-7 years), Principal (7+ years)

Responsibilities

As a Blockchain Engineer at Crossmint, you will be developing smart contracts, protocols, and backend integrations around them at the forefront of smart wallets, digital assets and verifiable credentials.

Your responsibilities will include:

• Write high quality smart contract code: correct, gas optimized, maintainable.
• Write secure code: follow security best practices, work with auditors to find bugs.
• Write integration code: for the deployment, observability and maintenance of smart contracts, and/or interactions with the contracts from our backend and frontend.
• Write architectural and design docs: individually and with the team.
• Run your projects end to end: from conceptualization, to shipping and beyond.
• Perform On-Call duties: participate in paid on-call shifts (once or twice a quarter).
• Mentor new team members.

About you

To thrive in this role, you should possess the following qualifications:

• Provable experience shipping high quality smart contract code.
• Excellent reading and writing comprehension skills in English.
• Experience working on a team and references to back it.
• Educational Background: Hold a Bachelor’s degree in Computer Science or a related field, or equivalent knowledge and skills with industry experience.
• Professional Experience:
  • 2+ years of experience working on smart contract development. Reusing an existing OpenZeppelin contract for an NFT drop doesn’t count, we look for novel smart contract development experience.
  • 2+ years working on security critical projects. We will ask you about how you ensure your code has the lowest chances of including bugs in production.
  • 2+ years designing protocols in one of more of the following fields: blockchain applications, decentralized finance, digital credentials and identity, authentication, authorization or distributed systems.
• Programming Expertise: Demonstrate expertise in multiple modern programming languages, including a focus on smart contract languages such as Solidity (p0), Rust (p1), or Move (p2).

Bonus points

We highly value candidates with any of the following experiences:

• Security / Cryptography background: Alternatively a background in mathematics, programming or security competitions (auditing, CTF, etc).
• Blockchain / smart contract knowledge on non EVM chains: Solana (rust), Sui (move), Aptos (move), or Cardano.
• Onchain: Have used crypto products (collected or created digital assets, participated in Defi, or created a Farcaster profile, etc), and formed opinions about how to move the industry forward.
• Published EIPs, patents, open source code or standards, or research papers in relevant areas

If you are passionate about revolutionizing payments in the NFT space and possess the skills and experience outlined above, we invite you to join us in our mission at Crossmint.

Please keep in mind: This is the full list of everything we’re looking for. You don’t need to check every single box to be a strong candidate, and having a good number of these would already indicate a solid fit for the role.

Benefits

• Highly competitive location-based compensation and benefits.
• Stock options program.
• Unlimited, flexible PTO.
• Flexible work schedule.
• Company laptop and allowance for any necessary home equipment.
• Daily stipend for commuting to the office.
• Company-paid trips for annual off-sites and onsites.

Our Principles

• Results and delivery: we value shipping: high quality and impactful code. We don’t care how you get it done.
• Build for the long term: we value building systems that stand the passage of time: scalable, secure, and reliable solutions.
• Extreme Ownership: we look for individuals with high agency, self motivated and driven who can own their projects end to end and help push the company forward.
• Be a team player: we look for kind individuals who can work in a team effectively, and also upskill the team they work on. In this role we specifically value mentorship ability.

Talent research indicates that women are often less inclined than men to apply for a role unless they have experience in 100% of the listed skills. However, this list is only a guide. We welcome your application even if you feel you meet around 75% of the requirements. At Crossmint, we believe skills can be learned, and diversity makes us stronger.

We work to foster a respectful environment where each person can be their authentic self, free from harassment, racism, and any form of discrimination. We proudly uphold our commitment to diversity and inclusion as an equal opportunity employer, and this policy applies to all employment practices within our organization.

Please note that Crossmint never conducts AI-based interviews, and all of our processes include an initial video call with a team member. Crossmint will not request your personal identification documents or any payment at any point during your interview process. Please stay vigilant about potential fraud. If you receive an email that claims to be from Crossmint but ends with any domain other than @crossmint.com, @crossmint.io or @paella.dev, it is not from us. We own these three domains listed before, and they are the only legitimate ones.

Please let our Talent Team know if you need any assistance completing any forms, or participating in the process.

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