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Mobile Application Developer Jobs in O Fallon, IL

duvari group

AI-Application Security Engineer

Saint Louis, MO · On-site

$57 - $76.25/hr

Mobile application security * AI security and red team testing * Build and automate security ... GitHub and Azure DevOps * CI/CD automation * AI platforms and large language models * Application ...

duvari group

AI-Application Security Engineer

Saint Louis, MO · On-site

$57 - $76.25/hr

Mobile application security * AI security and red team testing * Build and automate security ... GitHub and Azure DevOps * CI/CD automation * AI platforms and large language models * Application ...

duvari group

AI-Application Security Engineer

Saint Louis, MO · On-site

$57 - $76.25/hr

Mobile application security * AI security and red team testing * Build and automate security ... GitHub and Azure DevOps * CI/CD automation * AI platforms and large language models * Application ...

Stifel

AI-Application Security Engineer

Saint Louis, MO · On-site

$57 - $76.25/hr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

... and mobile application security capabilities. * Implement, integrate, tune, and scale security ... Leverage AI and automation to scale security operations, vulnerability management, and developer ...

Stifel

AI-Application Security Engineer

Saint Louis, MO · On-site

$57 - $76.25/hr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

... and mobile application security capabilities. * Implement, integrate, tune, and scale security ... Leverage AI and automation to scale security operations, vulnerability management, and developer ...

Stifel

AI-Application Security Engineer

Saint Louis, MO · On-site

$57 - $76.25/hr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

... and mobile application security capabilities. * Implement, integrate, tune, and scale security ... Leverage AI and automation to scale security operations, vulnerability management, and developer ...

The Timberline Group

Xamarin Developer

Saint Louis, MO · On-site +1

Role Summary The Web Application Developer's responsibilities may include: * Providing team participation and possibly leadership in supporting full project life cycle initiatives * Serve on project ...

The Timberline Group

Mobile iOS Developer

Saint Louis, MO · On-site +1

$50.25 - $69.25/hr

As a developer within the Mobile Infrastructure team, you'll help lead our efforts to establish our ... Work on bug fixing and improving application performance. * Continuously discover, evaluate, and ...

The Timberline Group

SR. SOFTWARE ENGINEER

Saint Louis, MO · On-site +1

$119K - $157K/yr

Leadership * Coach less senior Software Engineers in processes, techniques and problem solving ... Mobile Application Development:Maintain knowledge and skills in cross-platform mobile device ...

The Timberline Group

SOFTWARE ENGINEER

Saint Louis, MO · On-site +1

Proactively engage with more senior developers for help. Specific Skills may include * Custom ... Mobile Application Development:Maintain knowledge and skills in cross-platform mobile device ...

Marketvolt

Software Developer

Saint Louis, MO · On-site

  • Medical

  • Retirement

  • PTO

NET Software Developer / Software Engineer / Web Application Developer MarketVolt, LLC, a digital marketing software and services firm based in St. Louis, seeks a creative software developer who can ...

MarketVolt

Software Developer

Saint Louis, MO

  • Medical

  • Retirement

  • PTO

NET Software Developer / Software Engineer / Web Application Developer MarketVolt, LLC, a digital marketing software and services firm based in St. Louis, seeks a creative software developer who can ...

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Showing results 1-20

All JobsMobile Application Developer JobsMobile Application Developer Jobs in O Fallon, IL

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.
More about Mobile Application Developer jobs

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:

Mobile Application Developer jobs near you
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.

Mobile Application Development Lead

Sovereign Technologies

Saint Louis, MO • On-site

Full-time

Re-posted 10 hours ago

Job description

Company Description

Sovereign Technologies is an USA based information technology consulting and software services firm providing cost effective services and solutions to clients in North America and Asia Pacific.

Job Description

The Mobile Application Development Lead uses specialized depth and experience to oversee the writing and modifying of complex mobile based software applications. Leads work groups that are responsible for software development, design and quality testing. This position will create detailed specifications or designs, conduct quality assurance reviews of peer's application programming and act as a mentor to others in these programs. This position is competent to work at the highest technical level of all phases of application development activities.

ESSENTIAL FUNCTIONS:


Lead a team of Mobile based application developers through the full life cycle of complex projects

Mentor consultants and less experienced Mobile application developers

Design and develop reusable objects based on company security standards and MS best practices

Work with our business partners to review requirements

Build detail level designs for new functionality as well as migration of legacy technology to go forward technology

Work with QA partners to review test cases and automated test plans

Perform code reviews 

Scale solutions to the client's goals and budget 

Qualifications

Bachelor's degree in related field and 7+ years relevant experience

Mobile development experience using IOS(Objective C), Android(Java) or Windows Mobile(C#)

Experience using HTML/HTML5, CSS/CSS3, Java, JavaScript, JQuery, XML/XSL, JSON

Experience coding style sheets for responsive design

Knowledge of security standards and techniques for mobile applications 

Understand browser-specific compatibility issues 

Experience leading a team of multiple developers

Experience working with business partners and QA partners

Additional Information

All your information will be kept confidential according to EEO guidelines.

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