Mobile Application Developer

Mobile Application Developer (iOS & Android)

Join a dynamic team as a Mobile Application Developer Contractor, where you’ll play a key role in building a new, innovative component of a self-directed investing platform. This is a high-impact opportunity to work onsite with a collaborative engineering team, leveraging modern development practices and AI-driven tools to deliver scalable, secure, and user-centric mobile solutions.

• Location: New York, NY (Onsite – 5 days/week, W33rd & 10th Ave)
• Pay: $90–100/hour

• Must be authorized to work in the United States on a W2 basis without sponsorship (No C2C)

• Design, develop, and maintain high-performance mobile applications for a self-directed investing platform
• Collaborate closely with developers, product teams, and stakeholders in an onsite, agile environment
• Build scalable, secure, and user-friendly features for consumer-facing financial applications
• Leverage AI tools to enhance development workflows and improve user experience
• Integrate mobile applications with backend services and APIs
• Ensure code quality, performance optimization, and adherence to enterprise development standards
• Participate in code reviews, testing, and continuous improvement efforts

• 5–8+ years of professional experience in mobile application development delivering production-grade applications
• Strong expertise in:
• Swift (iOS) OR
• Experience building consumer-facing applications at scale
  , ideally within enterprise environments
• Strong understanding of mobile architecture, performance optimization, and development best practices
• Experience working in fast-paced, collaborative, and highly technical teams
• Ability to work onsite 5 days per week in New York City
• Strong communication skills and ability to work cross-functionally

• Experience developing applications within financial services or investment platforms
• Experience integrating with RESTful APIs and backend systems
• Familiarity with CI/CD pipelines, testing frameworks, and release management
• Exposure to AI/ML tools or AI-assisted development environments

• This role is open for two hires: 1 iOS Developer and 1 Android Developer
• Candidates should have deep expertise in a single platform (Swift or Kotlin) rather than both
• Developers who have experience building enterprise-scale, high-impact mobile applications
• Individuals comfortable working onsite in a highly collaborative, fast-paced environment
• Candidates looking to contribute to a greenfield build with strong visibility and impact

The CSI Companies is a leading staffing and recruiting firm with over 25 years of experience connecting top talent with exceptional opportunities across healthcare, technology, and professional services. We are committed to delivering results-driven solutions while maintaining a people-first approach for both our clients and candidates.

• Weekly pay
• Medical, dental, and vision coverage
• Voluntary Life/AD&D insurance
• Short-term and long-term disability coverage
• 401(k) plan
• Paid training and certifications (as applicable)