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Mobile Application Developer Jobs in O Fallon, IL

Staff Engineer, Mobile Cross-platform Are you passionate about the mobile and cross platform ... Guide the architecture of the application, working with all the engineering teams involved in the ...

UI Mobile Web Developer

Saint Louis, MO · On-site

$48.50 - $63.25/hr

At least 2 years experience in Production support and performance engineering. At least 1 year of ... Page Application development At least 1 year of experience in Mobile web application on cross ...

Java Developer

Saint Louis, MO

$49.50 - $64.25/hr

... Application Development & Support o Outsourced Testing Mobile Development and Test Automation The ... Founded 1996 Role: Java Developer Location - St. Louis, MO Duration: Long term contract Work ...

Android Developer

Saint Louis, MO · On-site

$30 - $40/hr

Ensure application performance, quality, and responsiveness. Collaborate with a team to define ... Knowledge of mobile data storage using SQLite, Room. Familiarity with RESTful APIs for back-end ...

Cybersecurity Analyst

O Fallon, IL · On-site

$95K - $125K/yr

... application management (MAM), and mobile threat defense (MTD). A strong understanding of mobile security best practices and mobile threat landscape is highly desired. * Scripting and programming ...

UI Developer

Saint Louis, MO

$48.50 - $63.25/hr

... application user interface for web, desktop, mobile and tablet browsers. Qualifications React.js,AngularJS, react.js, jQuery, jQuery UI,JavaScript,HTML5 Additional Information Only GC or Citizen

Java / J2EE Developer

Saint Louis, MO · On-site +1

$49.50 - $64.25/hr

We strive to keep learning and using the latest technologies from mobile (all platforms) to cloud ... You will be developing application solutions through the complete SDLC in a fun, challenging, and ...

UI Developer

Saint Louis, MO · On-site

$48.50 - $63.25/hr

At least 2 years experience in Production support and performance engineering. * At least 1 year of ... At least 1 year of experience in Mobile web application on cross platforms - iOS, Android and ...

UI Developer

Saint Louis, MO

$48.50 - $63.25/hr

At least 2 years experience in Production support and performance engineering. * At least 1 year of ... At least 1 year of experience in Mobile web application on cross platforms - iOS, Android and ...

Java / J2EE Developer

Saint Louis, MO · On-site +1

$49.50 - $64.25/hr

We strive to keep learning and using the latest technologies from mobile (all platforms) to cloud ... Proficient knowledge in object-oriented application development principles, theories, and concepts ...

Showing results 21-40

Mobile Application Developer information

See O Fallon, IL salary details

$49.9K

$103.1K

$147.4K

How much do mobile application developer jobs pay per year?

As of Aug 19, 2026, the average yearly pay for mobile application developer in O Fallon, IL is $103,058.00, according to ZipRecruiter salary data. Most workers in this role earn between $77,900.00 and $118,900.00 per year, depending on experience, location, and employer.

What is a mobile application developer?

A mobile application developer designs programs and apps for use on smartphones, tablets, and other mobile devices. These skilled computer professionals develop solutions on popular mobile platforms, such as iOS and Android, as their main job duty. Your software is typically made available through the Apple Store and the Google Play Store. Apps downloaded to the mobile devices are designed to perform various functions, allow for game play and entertainment, or assist with life goals. You need experience with a variety of programming languages and development platforms for this job.

What are some common challenges mobile application developers face when working on cross-platform apps?

Mobile Application Developers often encounter challenges related to ensuring consistent functionality and user experience across different devices and operating systems when building cross-platform apps. These challenges can include dealing with varying screen sizes, managing performance optimization, and integrating native device features. Collaboration with UI/UX designers and QA testers is essential to address compatibility issues, and staying updated with the latest frameworks and tools helps developers deliver reliable, high-quality applications.

What are the key skills and qualifications needed to thrive as a mobile application developer, and why are they important?

To thrive as a Mobile Application Developer, you need strong programming skills in languages such as Java, Kotlin, Swift, or Dart, along with a solid understanding of mobile UI/UX principles and a degree in computer science or a related field. Familiarity with development tools like Android Studio, Xcode, cross-platform frameworks (e.g., Flutter, React Native), and version control systems such as Git is typically required. Creative problem-solving, collaboration, and effective communication are standout soft skills in this role. These skills ensure the creation of reliable, user-friendly apps and facilitate efficient teamwork in a rapidly evolving mobile technology landscape.

What is the difference between Mobile Application Developer vs Web Developer?

AspectMobile Application DeveloperWeb Developer
CredentialsTypically requires programming skills in Swift, Java, or Kotlin; often has certifications in mobile app developmentRequires skills in HTML, CSS, JavaScript; may have certifications in web development or related technologies
Work EnvironmentDevelops apps for iOS and Android platforms, often working in IDEs like Xcode or Android StudioBuilds websites and web applications, working with browsers and server environments
Employer & IndustryTech companies, startups, app development agenciesBusinesses, digital agencies, e-commerce platforms
Search & Comparison IntentOften compared for career paths, skills, and job roles in mobile vs web development

Mobile Application Developers focus on creating apps for mobile devices using platform-specific languages and tools, while Web Developers build websites and web applications accessible via browsers. Both roles require programming skills but differ in platforms, tools, and deployment environments.

Is a mobile application developer a good career?

A mobile application developer is a viable career choice with strong demand due to the widespread use of smartphones and mobile apps. The role typically requires skills in programming languages like Java or Swift, and opportunities exist across various industries, offering competitive salaries and growth potential.

What cities near O Fallon, IL are hiring for Mobile Application Developer jobs?

Cities near O Fallon, IL with the most Mobile Application Developer job openings:

Infographic showing various Mobile Application Developer job openings in O Fallon, IL as of August 2026, with employment types broken down into 28% Full Time, and 72% Contract. Highlights an 94% In-person, 3% Hybrid, and 3% Remote job distribution, with an average salary of $103,058 per year, or $49.5 per hour.

Staff Engineer, Mobile Cross-platform

Bayer

Creve Coeur, MO • On-site, Remote

$130K - $180K/yr

Full-time

Medical, Dental, Vision, Retirement, PTO

Posted 7 days ago


Bayer rating

8.3

Company rating: 8.3 out of 10

Based on 70 frontline employees who took The Breakroom Quiz

25th of 86 rated pharmaceutical


Job description

At Bayer we're visionaries, driven to solve the world's toughest challenges and striving for a world where 'Health for all Hunger for none' is no longer a dream, but a real possibility. We're doing it with energy, curiosity and sheer dedication, always learning from unique perspectives of those around us, expanding our thinking, growing our capabilities and redefining 'impossible'. There are so many reasons to join us.

If you're hungry to build a varied and meaningful career in a community of brilliant and diverse minds to make a real difference, there's only one choice. Staff Engineer, Mobile Cross-platform Are you passionate about the mobile and cross platform technologies. Are you motivated by solving problems with real-world impact.

Do you want to help improve the lives of farmers and help protect the world's food supply. We are looking for a dedicated mobile engineer to help build our next generation of products and services. Digital Farming Solutions at Bayer seeks a Staff Mobile engineer to join one of our regional dynamic Product delivery teams working in cloud based distributed environments.

You will have the opportunity to work with large, "big data" sets such as scientific data, machine generated data from our farmer's equipment to geospatial data, precision agriculture, remote sensing, weather and or soil data. We are revolutionizing the agriculture industry by helping the world's farmers sustainably increase their productivity with digital tools. If you are someone that is passionate about innovation and excited about being a key contributor to building a sustainable business, Bayer would love to talk to you.

YOUR TASKS AND RESPONSIBILITIES The primary responsibilities of this role are to: Collaborate with Engineers, Data Analysts, Product Managers, and User Experience experts to craft an experience that will impact the face of farming. Engage with your team to provide technical designs and estimates for solutions to deliver the outcomes on the roadmap. Guide the architecture of the application, working with all the engineering teams involved in the business unit.

Work with an open, inclusive team engineers who are committed to continuous improvement, and quality. Participate in code reviews and mentor junior developers. On our team we share knowledge, help each other learn new things, and thrive on making our code better.

Be a key part of defining and implementing standards and best practices for all our mobile teams. WHO YOU ARE Bayer seeks an incumbent who possesses the following: Required: 8+ years of software development experience 2+ years of experience building mobile applications with a cross-platform tool (Kotlin Multiplatform or React Native) Experience developing apps for iOS and Android platforms (Swift and Kotlin languages) Deep knowledge of architectural patterns (e.g., MVVM, MVC) Experience with releasing applications in the app stores Experience with git or other distributed version control systems Experience with testing and automation tools Good communication skills Bachelor's degree in Computer Science or related technical field, or equivalent experience Preferred: Experience with C++ Experience with integrating with GraphQL APIs Experience with leading without authority Knowledge of secure mobile development principles Experience working with Product and Design to ship ground-breaking features Champion of mobile standards, accessibility Employees can expect to be paid a salary of approximately $130k-180k. Additional compensation may include a bonus or incentive program (if relevant)

Additional benefits include health care, vision, dental, retirement, PTO, sick leave, etc.. This salary (or salary range) is merely an estimate and may vary based on an applicant's location, market data/ranges, an applicant's skills and prior relevant experience, certain degrees and certifications, and other relevant factors. This posting will be available for application until at least 6/25/26

YOUR APPLICATION Bayer offers a wide variety of competitive compensation and benefits programs. If you meet the requirements of this unique opportunity, and want to impact our mission Health for all, Hunger for none, we encourage you to apply now. Be part of something bigger.

Be you. Be Bayer. To all recruitment agencies: Bayer does not accept unsolicited third party resumes.

Bayer is an Equal Opportunity Employer/Disabled/Veterans Bayer is committed to providing access and reasonable accommodations in its application process for individuals with disabilities and encourages applicants with disabilities to request any needed accommodation(s) using the contact information below. Equal Opportunity Employer Statement: Notice for U.S. Visitors: All information on this site is subject to compliance with local rule and regulations as they may vary from time to time and across different geographies, including, without limitation, U.S

Executive Orders. Bayer is an E-Verify Employer. Location: United States : Washington : Seattle || United States : Illinois : Chicago || United States : Missouri : Creve Coeur || United States : Residence Based : Residence Based Division: Crop Science Reference Code: 859306 Contact Us Email: hrop_usa@bayer.com


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About Bayer

Sourced by ZipRecruiter

Bayer is a global enterprise with core competencies in the life science fields of healthcare and nutrition. We design our products and services to help people and planet thrive by supporting efforts to address the unprecedented global challenges presented by a growing and aging global population. At Bayer, we’re committed to drive sustainable development and generate a positive impact with our businesses. Through bold ideas and unprecedented insights, we’re pioneering new possibilities that advance life for all of us. That means reimagining how we care for ourselves and one another by empowering everyday health, improving approaches to patient care, and finding better ways to nourish our communities around the world.

Industry

Agriculture

Company size

10,000+ Employees

Headquarters location

Whippany, NJ, US