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Mobile App Developer at Sizanid Staffing. Reports To: Engineering Manager, Mobile Lead, or CTO. About the Opportunity. Our staffing agency is recruiting on behalf of a leading client for an experienced . Mobile App Developer. to design, build, and maintain high‑quality mobile applications. This role is ideal for a developer who combines strong technical expertise with a user‑centric mindset and thrives in fast‑paced, collaborative environments. The position includes responsibility for implementing and maintaining secure . payment integrations. within mobile applications.. Key Responsibilities. Develop, test, and deploy mobile applications for . iOS. , . Android. , or . cross‑platform. environments depending on project needs.. Build and maintain . payment integration features. , including secure transaction flows, third‑party payment SDKs, and compliance with platform and industry standards.. Collaborate with product managers, designers, and backend teams to translate requirements into functional, intuitive mobile experiences.. Integrate mobile applications with APIs, third‑party services, and backend systems.. Optimize applications for performance, responsiveness, and scalability across devices.. Troubleshoot, debug, and resolve issues throughout the development lifecycle.. Maintain clean, well‑documented, and reusable code following best practices and coding standards.. Participate in code reviews and contribute to continuous improvement of development processes.. Manage app store submissions, updates, and release cycles for iOS and/or Android.. Stay current with emerging mobile technologies, frameworks, and industry trends.. 3–5+ years of professional experience in mobile application development.. Proficiency in one or more of the following:. iOS:. Swift, SwiftUI, Objective‑C, Xcode. Android:. Kotlin, Java, Android Studio. Cross‑Platform:. React Native, Flutter, Dart. Experience integrating . payment gateways. or SDKs (Stripe, PayPal, Apple Pay, Google Pay, Braintree, etc.).. Strong understanding of mobile UI/UX principles and platform guidelines.. Experience integrating REST APIs, JSON, and third‑party SDKs.. Familiarity with Git or other version control systems.. Ability to work collaboratively with cross‑functional teams and communicate technical concepts clearly.. Preferred Qualifications. Experience with CI/CD pipelines for mobile deployments.. Knowledge of mobile security best practices, authentication, and data protection.. Experience with Firebase, AWS Mobile, or Azure Mobile services.. Background in Agile/Scrum development environments.. Prior experience publishing apps to the . App Store. or . Google Play. .. Familiarity with PCI‑compliant development practices.. Core Competencies. Problem‑solving and analytical thinking. Strong attention to detail. Creativity in designing user‑friendly mobile experiences. Clear communication and teamwork. Ability to manage multiple tasks and deadlines. Adaptability in evolving technical environments. Company Location: Brazil.