Principal App Engineer - Contract

Job Description

We're looking for a Principal Mobile App Engineer to lead the design, development, and evolution of high-performing mobile applications built with React Native. This is a hands-on leadership role ideal for someone who thrives in a fast-paced environment, enjoys solving complex problems, and can bridge the gap between business goals and technical execution.
What You'll Do

• Lead the architecture and development of scalable, high-performance mobile apps using React Native and modern React frameworks
• Act as the subject matter expert (SME) for all mobile app development initiatives
• Partner with product, design, and engineering leaders to deliver impactful features that drive user engagement and conversion
• Translate business needs into elegant, well-architected technical solutions
• Guide teams in building maintainable, reusable, and performant codebases
• Support production releases, troubleshoot issues, and ensure application stability
• Drive adoption of best practices in CI/CD, testing, and deployment strategies
• Collaborate on long-term architecture and technology roadmap planning
• Evaluate new tools, frameworks, and trends to keep the platform modern and competitive
• Lead experimentation and feature innovation to continuously improve user experience

What You Bring

• Deep expertise in React Native and React-based ecosystems
• Strong experience building and scaling mobile applications with high performance and reliability
• Proficiency with JavaScript/TypeScript, Node.js, and modern frameworks (e.g., Next.js)
• Experience consuming REST APIs and GraphQL services
• Familiarity with cloud environments and modern application architectures (e.g., JAMstack)
• Advanced knowledge of CI/CD pipelines, version control (Git), and agile tools (Jira, Confluence)
• Experience implementing:
  • Design systems and component libraries
  • Feature flagging and experimentation frameworks
  • Mobile integrations such as payments (Apple Pay, Google Pay, PayPal) and social logins
• Strong understanding of application security, performance optimization, and debugging
• Experience working in fast-paced, agile environments

Leadership & Collaboration

• Excellent communicator with the ability to explain complex technical concepts to non-technical stakeholders
• Proven ability to mentor engineers and guide development efforts across teams
• Strong problem-solving mindset with a focus on delivering business value
• Comfortable using modern developer tooling, including AI-assisted coding tools (e.g., GitHub Copilot)

Qualifications

• 10+ years of overall software engineering experience
• 5+ years of hands-on experience building applications with React Native
• Bachelor's degree in Computer Science, Information Systems, or related field (Master's preferred)

Nice to Have

• Experience with CMS platforms (e.g., Sitecore)
• Experience in high-traffic consumer applications or digital platforms
• Background in experimentation, A/B testing, and analytics-driven development

Why Join
You'll have the opportunity to shape the future of mobile experiences, influence architecture at scale, and work on products used by a large and growing user base-all while collaborating with a forward-thinking, innovation-driven team.