254 Mobile Application jobs in the United States

The National Security Sector within Leidos is seeking a Mobile Application Developer to provide technical expertise on a mission-critical program whose purpose is to development, modernize, enhance, operate, and maintain services for DHS/CBP mission critical systems. Mobile App Developers require a strong mix of communications skills and hands on technical troubleshooting to support application issues and application of preventative measures. In this hands-on position, you will work collaboratively to architect, design, build, deliver, and enhance highly available, scalable, real-time systems. You will exercise your judgment in determining and recommending the best designs based on customer business objectives, timelines and other resource constraints. You will participate in and/or direct major deliverables of projects through all aspects of the software development lifecycle including scope and work estimation, architecture and design, coding and unit testing.

The candidate should have expertise in Mobile App Development. This position requires the candidate to be in Ashburn, VA, twice a week.

• BS/BA degree and 12 years of prior relevant experience or Master's with 10 years of prior relevant experience; or 4 years of additional experience in lieu of degree
• At least 5 years experience with Mobile Application Development, must have experience with both Android & iOS
• Requires experience in both Front-end Mobile and Back-end RESTFUL API development.
• Requires experience in development of JAVA, Node JS applications.
• Requires experience in both NoSQL and SQL database's.
• Must have strong application testing discipline.
• Experience with Google's Flutter engine and Google's Dart language and similar Android/iOS framework.
• Excellent problem-solving skills.
• Creative thinker
• Proficiency and knowledge of the following: Postgres, Springboot, SQL, Kafka, MySQL, Struts, Hibernate, Java, JSF, Swing, JavaScript, Bootstrap, Angular/React is desired.
• Knowledge of software design patterns.
• Experience with an issue/problem tracking system (e.g., Jira)
• Proficiency with common Agile practices, service-oriented environments, and better development practices
• Excellent written and verbal communication skills
• Experience with DevOps frameworks
• U.S. Citizen
• Must be able to maintain and obtain a CBP Background Investigation prior to start

• Active CBP BI
• Experience with CBP
• AWS Experience
• Knowledge of CI/CD pipeline
• Worked in Agile environment
• Other mobile framework

Come break things (in a good way). Then build them smarter. We're the tech company everyone calls when things get weird. We don't wear capes (they're a safety hazard), but we do solve high-stakes problems with code, caffeine, and a healthy disregard for "how it's always been done."

While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date. The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law. Leidos is an equal opportunity employer/disability/vet.

Woodlawn, MD (On-Site/Office)

Key Required Skills: Building modern mobile applications that seamlessly integrate with legacy COBOL and Java backend systems while utilizing the latest technologies such as Swift, Flutter, Kotlin, Vue 3, and React Native.

Develop & Maintain Mobile Applications: Design and develop native iOS applications using Swift and SwiftUI. Develop native Android applications using Kotlin and Jetpack Compose. Build cross-platform mobile applications using React Native and Flutter.

Backend Integration with Legacy Systems: Integrate mobile apps with existing COBOL-based and Java-based backend systems. Collaborate with backend teams to build RESTful APIs or GraphQL endpoints that interact with legacy systems. Design API gateways to expose COBOL and Java services to modern mobile platforms.

Cross-Platform Mobile Development: Write reusable, clean, and modular code for React Native and Flutter to ensure efficient development of cross-platform mobile apps. Work with native modules when necessary for integrating mobile-specific features not available in cross-platform libraries.

Collaborate with UI/UX Designers: Work with UI/UX teams to implement intuitive and responsive designs that meet user requirements and align with mobile platform guidelines. Ensure the UI responsiveness and consistency across both iOS and Android devices.

Optimize Mobile Applications: Use performance profiling tools (Xcode Instruments, Android Profiler) to identify and fix bottlenecks in both native and cross-platform apps. Implement best practices for memory management and app performance optimization.

Testing & Quality Assurance: Develop unit tests and integration tests to ensure code quality and robustness. Implement automated testing for mobile applications with frameworks such as Jest, XCTest, or Flutter Test.

CI/CD Pipeline Integration: Set up CI/CD pipelines using GitHub Actions, GitLab CI, or Bitrise to automate builds, testing, and deployment for mobile applications.

Security & Compliance: Implement secure communication protocols (HTTPS), OAuth authentication, and data encryption for mobile apps. Ensure mobile apps comply with security standards and insurance industry regulations (e.g., GDPR, HIPAA).

US Mobile is on a mission to revolutionize connectivity. Imagine a world where you can go into a single app and buy terabytes of data for every one of your devices: phone, smart devices, car, home broadband, and more. That's the future that US Mobile is building: a software platform built truly for the 21st century and the age of 5G and IoT, with world class engineering, best-in-class user experience, and features that will define the next generation of connectivity.

At the core of it all, we have a team and culture that has been recognized by Forbes as one of the top 500 best startup employers in the US. Our team spans diverse backgrounds, cultures, and stories, with employees coming from 20+ countries.

We're a venture-backed company entering hypergrowth, having recently ranked 94th on Inc 5000's fastest-growing private companies in America, and we're looking for someone exceptional to join our team.

What You'll Do:

• Take full ownership of the React Native mobile app lifecycle, from initial architecture decisions through final deployment.
• Partner closely with product and design stakeholders to create high-performance, user-friendly features with strong visual appeal.
• Establish and maintain robust testing frameworks, reliability standards, and streamlined release processes.
• Guide and develop fellow engineers while fostering an environment focused on high-quality code, creative solutions, and ongoing skill development.
• Drive mobile strategy decisions and help steer product roadmap through direct engagement with executive team.
• Enhance application speed, tracking, and reliability by leveraging performance metrics and error monitoring platforms.

• Minimum 7 years in mobile development, including at least 6 years of hands-on React Native expertise.
• Proven track record of successfully launching applications on both App Store and Google Play.
• Deep knowledge of mobile user experience principles and the distinct characteristics of iOS and Android platforms.
• Hands-on experience with continuous integration/deployment, over-the-air updates (such as Expo), and release automation.
• Demonstrated ability to excel in dynamic startup settings-delivering quickly without compromising code quality.
• Excellent interpersonal skills with a passion for knowledge sharing and team collaboration.

• React Native (0.77+) + TypeScript
• Expo SDK* Redux Toolkit
• Tanstack ReactQuery
• React Navigation
• Firebase

• Competitive salary - $160k-240k (NYC based)
• Gym reimbursement
• Free cellular service on the best network in the US
• Free lunch in NYC office & fully stocked kitchen
• Metrocard reimbursement
• Flexible working hours

Position: Software Dev Engineer IV 

Location: San Francisco, CA, 94105 

Job Description:     

Responsible for building connections between customers artists and fans 

Responsible for playlist experience, curating, listening, collaborating, sharing 

Typical Day in the Role: 

Pair with full-time employees to work on projects. Collaborative work.  

Gaps in mobile development so looking to help develop that out. 

Candidate Requirements: 

Ownership, Delivers results, insists on highest standards  

2-3 years in mobile development 

IOS – Objectivcy Swift UI/ UIKit +combine 

Android – Java, Jet pack compose 

Nice to have: 

React native 

Kotlin Multiplatform 

Degrees: 

Bachelors’ computer science or similar 

Top 3 must-have hard skills 

Mobile application development 

System design – client 

Test driven development

• Design, develop, and maintain Android applications that interact with real-time systems.
• Support iOS development as needed for cross-platform compatibility.
• Ensure seamless communication between mobile app vehicle systems
• Optimize app performance, UI/UX, and responsiveness.
• Collaborate with embedded engineers and cloud engineers to ensure system compatibility.
• Conduct testing, debugging, and troubleshooting for app reliability.
• Implement best practices for security, data integrity, and app lifecycle management.
• Stay up to date with emerging mobile technologies and frameworks.

• 5+ years of experience in Android development
• Experience in iOS development (Swift, Objective-C).
• Strong understanding of real-time systems, IoT, or embedded system interfaces.
• Experience with mobile UI/UX for device control applications.
• Ability to integrate with cloud services, APIs, and streaming data sources.
• Knowledge of automotive, robotics, or IoT applications is a plus.
• Strong debugging skills and familiarity with real-time communication protocols.

Description

The National Security Sector within Leidos is seeking a Mobile Application Developer to provide technical expertise on a mission-critical program whose purpose is to development, modernize, enhance, operate, and maintain services for DHS/CBP mission critical systems. Mobile App Developers requires a strong mix of communications skills and hands on technical trouble shooting to support application issues and application of preventative measures.

In this hands-on position, you will work collaboratively to architect, design, build, deliver, and enhance highly available, scalable, real-time systems. You will exercise your judgment in determining and recommending the best designs based on customer business objectives, timelines and other resource constraints. You will participate in and/or direct major deliverables of projects through all aspects of the software development lifecycle including scope and work estimation, architecture and design, coding and unit testing. The candidate should have expertise in Mobile App Development

This position REQUIRES the candidate to be in Ashburn, VA, 2 twice a week

Basic Qualifications:

• BS/BA degree and 12 years of prior relevant experience or Master's with 10 years of prior relevant experience; or 4 years of additional experience in lieu of degree

• At least 5 years experience with Mobile Application Development, must have experience with both Android & iOS

• Requires experience in both Front-end Mobile and Back-end RESTFUL API development.

• Requires experience in development of JAVA, Node JS applications.

• Requires experience in both NoSQL and SQL database's.

• Must have strong application testing discipline.

• Experience with Google's Flutter engine and Google's Dart language and similar Android/iOS framework.

• Excellent problem-solving skills.

• Creative thinker

• Proficiency and knowledge of the following: Postgres, Springboot, SQL, Kafka, MySQL, Struts, Hibernate, Java, JSF, Swing, JavaScript, Bootstrap, Angular/React is desired.

• Knowledge of software design patterns.

• Experience with an issue/problem tracking system (e.g., Jira)

• Proficiency with common Agile practices, service-oriented environments, and better development practices

• Excellent written and verbal communication skills

• Experience with DevOps frameworks

• U.S. Citizen

• Must be able to maintain and obtain a CBP Background Investigation prior to start

Preferred Qualifications:

• Active CBP BI

• Experience with CBP

• AWS Experience

• Knowledge of CI/CD pipeline

• Worked in Agile environment

• Other mobile framework

Come break things (in a good way). Then build them smarter.

We're the tech company everyone calls when things get weird. We don't wear capes (they're a safety hazard), but we do solve high-stakes problems with code, caffeine, and a healthy disregard for "how it's always been done."

Original Posting:

August 1, 2025

For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range:

Pay Range $126,100.00 - $227,950.00

The Leidos pay range for this job level is a general guideline onlyand not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.

REQNUMBER: R-00163749

All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or veteran status. Leidos will consider qualified applicants with criminal histories for employment in accordance with relevant Laws. Leidos is an equal opportunity employer/disability/vet.

• Yes
• No

• Yes
• No

• Texas Class A - CDL or equivalent from another state.
• Texas Class B - CDL or equivalent from another state.
• Texas Class C or equivalent from another state.
• No, I do not have a valid driver's license.

• Yes, it has been translated and certified and I can provide documentation upon a job offer.
• No, I have not had my degree translated and certified.
• N/A - my degree is from an accredited U.S. university or college.

• I acknowledge I have read and understand the above information.

Roles & Responsibility:

• Responsible in Collaborating with product and business teams to define our product, balancing features with time to market.
• Responsible to Implement clean, modern, smooth animations and transitions that provide an excellent user experience and integrate third-party API's. Store, retrieve, and manipulate data for analysis of system capabilities and requirements.
• Responsible for reviewing code of peers and ensure daily smaller commits and help remediate bad commits.
• Troubleshoot and fix bugs, crashes, and performance issues.