Crossmint is hiring Web3 🤖Mobile Engineer - SDKs (Contract - Spain or US)

Desired Qualifications

🤖 Mobile Engineer - SDKs (Contract - Spain or US) If you are interested, please apply here About Crossmint At Crossmint we re on a mission to bring the world on-chain, starting with property rights. We believe that the current ways of tracking who owns what are outdated, inefficient and unfair. Property is one of the foundational layers of human society, yet tracking ownership of many assets (such as real estate, clothes, furniture, tickets or electronics) remains costly and inaccessible. This not only slows down commerce but also leads to thefts, fraud, and diminished reusability. The solution? Blockchain, and cryptographic technologies like NFTs, wallets and cryptographic credentials, offer a scalable and credible digital property system to transform asset ownership worldwide. Since the creation of the NFT standard, all user and business adoption metrics have grown exponentially, non stop. What started as a toy use case to speculate over cat and monkey pictures, is now being used by half of Fortune 500 and tens of millions of users. Still, we re just getting started – less than 1% of the journey is complete. How do we do this? Crossmint is accelerating the world transition to on-chain, by building APIs and tools that make it 10x easier for companies to create, custody and commerce with digital property rights (NFTs) and credentials. Our APIs abstract out all the quirks and complexities of interacting with blockchains to simple REST APIs and no-code tools that any company can adopt, in minutes. How do we fund this mission? We sell our tools and APIs as a service to other companies who wish to integrate NFTs, wallets or credentials inside their systems. We save these companies hundreds of thousands of dollars in infrastructure and engineering, and charge them a fraction to manage all for them in a secure, compliant and low maintenance way. More than 30,000 devs and companies have used us, including Sony, Mastercard, Microsoft, Etihad Airways, Red Bull, Adidas, Asus, AC Milan, Phantom, Rarible, Refik Anadol, Leo Messi, and Snoop Dogg. In addition, Crossmint is backed by top tier investors and angels in the fintech and crypto space. Who are we looking for? We are opening a Mobile Engineer role to lead the development of mobile SDKs for Crossmint, starting with SDKs for wallets and authentication, and later expanding to payments and other services. We re looking for a senior engineer who can create a durable foundation for our mobile SDKs: architect and design them, set up CICD automations, and deliver one or two features. Then, the rest of the Crossmint team is expected to implement individual features themselves. You ll need to work autonomously and lead the charge to ensure our mobile SDKs are best-in-class. Location Spain / USA Type of employment Contract (2 months - Renewable). 20h-40h per week. Compensation Per-hour setting for the contract duration, but open to project completion-based compensation. Seniority Senior (5 - 7 years) Responsibilities As a Mobile SDK Engineer at Crossmint, you will be responsible for: Designing and architecting mobile SDKs from the ground up. Building SDKs for core features such as authentication, smart wallets, and payments. Collaborating with cross-functional teams to understand the business needs and translate them into mobile SDK solutions. Documenting your architecture and design choices clearly and concisely. Owning your projects end to end: from initial concept through to deployment and support. Mentoring other team members as we grow the mobile engineering team. About you To thrive in this role, you should possess the following qualifications: Professional Experience: 5+ years of experience in mobile software development, with at least 1+ year specifically in mobile SDK development (not just mobile app development) in native iOS (Obj C / swift) and Android (Java or Kotlin). Excellent Communication Skills: Demonstrate excellent written and spoken English. Educational Background: Hold a Bachelor s degree in Computer Science or a related field, or equivalent knowledge and skills with industry experience. Programming Expertise: Expert knowledge in at least one mobile development language (Swift, Kotlin, etc.). Preferred Experience We highly value candidates with the following experiences: Experience with blockchain or Web3 technologies is a plus, particularly in relation to wallets or payment systems. Provable experience shipping high quality code. Experience working on a team and references to back it. React Native or Flutter experience is nice to have If you are passionate about revolutionizing the NFT space and possess the skills and experience outlined above, we invite you to join us in our mission at Crossmint. Our Principles Results and delivery: Ship high quality work fast. Build for the long term: Build scalable, secure, and reliable solutions. Use AI. Extreme Ownership: Be an effective Directly Responsible Individual (DRI). Be proactive. Be a team player: Be an effective and kind colleague providing credible challenge. Be present and reliable. ********************** If you are interested, please apply here Follow us on Linkedin and Twitter to keep updated with our latest activity! 👣

Duties & Responsibilities

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