Software Engineer III (Mobile - React Native)

CSI; United States; Remote; USD 120,000 - 150,000; Full time

Job summary

Computer Services, Inc. (CSI) seeks a Software Engineer III to design, code, test, and debug scalable mobile apps using React Native and TypeScript for iOS and Android.

You will contribute to modernization and integration with banking core systems, maintaining high performance and usability across platforms. You will lead large mobile projects, enforce best practices, mentor peers, and drive architecture discussions with frontend, backend, and integration teams in a regulated financial

Qualifications

• 5+ years of professional software engineering experience with mobile development.
• 4-5 years hands-on React Native and TypeScript experience including API, backend service, and third-party integrations.
• Experience with financial systems, banking platforms, core integrations, or regulated technology environments preferred.
• College degree in software engineering, or related field or equivalent industry experience required.
• Strong engineering fundamentals, including clean code, maintainable architecture, performance, testing, reliability, security awareness, and documentation.
• Clear communicator who can collaborate across engineering, product, design, QA, security, architecture, and business teams.
• Ability to manage competing priorities in an Agile environment while balancing delivery, support, technical debt, and quality.

Responsibilities

• Own development and rollout of large mobile projects and cross-platform solutions integrated with backend systems.
• Enforce best practices in React Native, TypeScript, mobile performance, and responsive design.
• Deliver high-quality mobile features efficiently and on time.
• Define mobile architecture, APIs, and integration risks (performance, compatibility, dependencies).
• Promote Agile, CI/CD, and mobile best practices; mentor peers.
• Apply modern mobile technologies and evolving TypeScript ecosystem.
• Strong in React Native and TypeScript; collaborate across backend and integrations.
• Drive mobile UX, architecture, and integration strategy in online banking domain.
• Guide engineers in scalable mobile development.
• Support team effectiveness and cross-functional initiatives.

Skills

React Native

TypeScript

API integration

Backend services

Third-party systems

Mobile architecture

Agile

Communication

Education

Bachelor's degree in software engineering or related field

Tools

CI/CD

Job description

Job Description:

Software Engineer III designs, codes, tests, and debugs scalable mobile applications using React Native and TypeScript; maintains and documents program changes with a focus on performance, usability, and reliability across iOS and Android. Works in complex areas of major CSI applications with emphasis on mobile architecture and third-party integrations, including banking core systems. Contributes to modernization of existing technologies and integration layers. Requires strong problem-solving, creativity, and high engineering standards to deliver intuitive, high-performing mobile experiences.

Responsibilities:

• Project Leadership: Own development and rollout of large mobile projects and cross-platform solutions integrated with backend systems.
• Standards and Practices: Enforce best practices in React Native, TypeScript, mobile performance, and responsive design.
• Project Management: Deliver high-quality mobile features efficiently and on time.
• Technical Specifications: Define mobile architecture, APIs, and integration risks (performance, compatibility, dependencies).
• Coaching and Mentorship: Promote Agile, CI/CD, and mobile best practices; mentor peers.
• Expertise and Innovation: Apply modern mobile technologies and evolving TypeScript ecosystem.
• Programming Knowledge: Strong in React Native and TypeScript; ability to collaborate across backend and integrations.
• Thought Leadership: Drive mobile UX, architecture, and integration strategy in online banking domain.
• Mentorship: Guide engineers in scalable mobile development.
• Additional Duties: Support team effectiveness and cross-functional initiatives.

Requirements:

• Requires 5+ years of professional software engineering experience, with strong mobile development experience delivering scalable, reliable applications.
• Must have 4-5 years of hands-on React Native and TypeScript experience, including API, backend service, and third-party system integrations.
• Experience with financial systems, banking platforms, core integrations, or regulated technology environments preferred.
• College degree in software engineering, or related field or equivalent industry experience required.
• Strong engineering fundamentals, including clean code, maintainable architecture, performance, testing, reliability, security awareness, and documentation.
• Clear communicator who can collaborate across engineering, product, design, QA, security, architecture, and business teams.
• Ability to manage competing priorities in an Agile environment while balancing delivery, support, technical debt, and quality.

As a forward-thinking software provider, Computer Services, Inc. (CSI) helps community and regional financial institutions solve their customers’ needs through open and flexible technologies. In addition to its award-winning core banking platform, these include the latest in lending, digital banking, payments, financial crime prevention and cybersecurity. Building on its 60-year track record of personalized service, CSI is shaping the future of banking and empowering its customers to rival their competition. For more information about CSI, visit www.csiweb.com

CSI provides rewarding and challenging career opportunities for our employees. When determining your pay, we consider various factors such as your skills, qualifications, experience and location. Along with a competitive salary, this position includes eligibility for incentive awards based on both individual and business performance. We also offer a comprehensive range of benefits. To learn more about our benefits, visit Benefits Summary

CSI is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, gender identity, national origin, age, physical and mental disability, marital status, veteran status, or any other characteristic protected by applicable law. If you need an accommodation during the recruitment process, please email us at [e-mail] and we will work with you to meet your accessibility needs.

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Visa Sponsorship: We are unable to offer visa sponsorship for this position. Applicants must be authorized to work in the United States without the need for sponsorship now or in the future.