Android Engineer - SDKs (Contract - Spain or US)

This position is posted by Jobgether on behalf of Crossmint. We are currently looking for an Android Engineer - SDKs (Contract) in the United States or Spain.

We are seeking an experienced Android SDK Engineer to design and build high-quality mobile SDKs that enable seamless integration of financial and agentic commerce features. This role involves architecting solutions for authentication, wallets, payments, and other core functionalities while collaborating closely with cross-functional teams to translate business needs into robust SDK implementations. The ideal candidate thrives in a fast-paced, innovative environment, takes ownership of projects end-to-end, and is passionate about delivering scalable, secure, and reliable solutions. You will contribute to shaping the mobile engineering culture, mentoring team members, and helping bring next-generation financial applications to life.

Accountabilities

• Design, architect, and implement Android SDKs from concept to deployment, focusing on features such as authentication, smart wallets, and payments.
• Collaborate with product, engineering, and business teams to translate requirements into efficient, high-quality SDK solutions.
• Document architecture, design decisions, and implementation processes clearly for internal and external stakeholders.
• Own projects end-to-end, including development, testing, deployment, and ongoing support.
• Mentor and guide other mobile engineers, fostering growth and knowledge sharing within the team.
• Ensure SDKs are scalable, secure, and maintainable, adhering to industry best practices.

• 5+ years of professional Android development experience, with at least 1 year specifically in mobile SDK development using Java or Kotlin.
• Bachelor’s degree in Computer Science, Engineering, or related field, or equivalent practical experience.
• Strong programming expertise in Java and/or Kotlin with proven ability to deliver production-ready SDKs.
• Excellent written and spoken English communication skills.
• Experience collaborating with cross-functional teams and translating complex requirements into technical solutions.
• Strong problem-solving skills, attention to detail, and ability to work independently in a remote or hybrid environment.
• Bonus: Experience with blockchain or Web3 technologies, React Native, or Flutter is highly valued.

• Competitive hourly rate or project-based compensation, depending on agreement.
• Remote work flexibility with team collaboration across Spain or the United States.
• Exposure to cutting-edge technologies in fintech, blockchain, and AI-powered applications.
• Opportunity to contribute to the development of widely used SDKs in programmable finance.
• Supportive and inclusive work environment that encourages innovation, ownership, and professional growth.

Jobgether is a Talent Matching Platform that partners with companies worldwide to efficiently connect top talent with the right opportunities through AI-driven job matching.

When you apply, your profile goes through our AI-powered screening process designed to identify top talent efficiently and fairly.
🔍 Our AI evaluates your CV and LinkedIn profile thoroughly, analyzing your skills, experience, and achievements.
📊 It compares your profile to the job’s core requirements and past success factors to determine your match score.
🎯 Based on this analysis, we automatically shortlist the 3 candidates with the highest match to the role.
🧠 When necessary, our human team may perform an additional manual review to ensure no strong profile is missed.

The process is transparent, skills-based, and free of bias — focusing solely on your fit for the role. Once the shortlist is completed, we share it directly with the company that owns the job opening. The final decision and next steps (such as interviews or additional assessments) are then made by their internal hiring team.

Thank you for your interest!

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