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Mobile Application Developer Jobs in O Fallon, IL

Morgan Stanley

Mainframe CICS Systems Engineer

Clayton, MO · On-site

$45.75 - $59/hr

ETS also delivers all workplace technologies (desktop, mobile, voice, video, productivity, intranet ... Application and end user functions are delivered on a scalable, secure, and reliable infrastructure ...

Adidev Technologies Inc

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 ...

Adidev Technologies Inc

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 ...

Jobsbridge

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

The Timberline Group

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 ...

Sonsoft Inc

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 ...

Sonsoft Inc

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 ...

The Timberline Group

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 ...

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Showing results 21-40

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 Sep 8, 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 62% Full Time, and 38% Contract. Highlights an 89% In-person, and 11% Hybrid job distribution, with an average salary of $103,058 per year, or $49.5 per hour.

Software Engineer III - React Native (TypeScript)

Saint Louis, MO • On-site

BOK Financial
See more jobs at BOK Financialexternal

$129K - $162K/yr

Full-time

Re-posted 3 days ago

Key responsibilities

  • Design, build, and ship cross-platform mobile applications using React Native and TypeScript.

  • Implement API integrations, handle authentication and authorization, and develop scalable mobile features.

  • Own testing strategies, shape CI/CD pipelines, and monitor application performance and security.

Job description

Req ID: 78010 

Location: Tulsa -TUL, Oklahoma City -OKC, Dallas -DAL, Houston -HOUS, Kansas City -KSCY, Phoenix -PHOE, San Antonio -SANAN, Lincoln -LNCL, Little Rock -LTLRK, Memphis- Memph, Salt Lake City, UT, Springfield -SPRI, St Louis -STLPL 

Areas of Interest: Software Development 

Pay Transparency Salary Range: Not Available 

Application Deadline: 08/28/2026

BOK Financial Corporation Group includes BOKF, NA; BOK Financial Securities, Inc. and BOK Financial Private Wealth, Inc. BOKF, NA operates TransFund and Cavanal Hill Investment Management, Inc. BOKF, NA operates banking divisions: Bank of Albuquerque; Bank of Oklahoma; Bank of Texas and BOK Financial.

Bonus Type
Discretionary
Summary

In this role, you'll mentor the project team, share knowledge, and collaborate with the Solution Architect to determine project architecture. You'll lead development efforts, promote best programming practices, and influence engineering standards across the team. You'll also provide application support, develop and document applications, and maintain system documentation and configuration.

This role is focused on driving cross-platform mobile strategy and architecture, with an emphasis on React Native and long-term platform evolution.

Job Description

As a Senior Software Engineer, you'll be a hands-on technical leader and key contributor in a cross-functional team, often acting as a technical lead. You'll design, build, and ship cross-platform mobile applications using React Native (TypeScript), integrating with modern backend services on AWS.

You'll drive execution, mentor engineers, and champion operational excellence in mobile development while helping define and evolve our overall mobile platform strategy.

Team Culture

Our mission is to empower our company, teammates, and customers through resilient, customer-centric technology. We leverage our technical expertise and deep business understanding to deliver impactful solutions.

Mindset
Ownership, customer obsession, growth mindset, think big - start small, bias for action, and relentless pursuit of engineering excellence.

Why Join Us
Impact: Build mobile experiences used by thousands of customers daily and help modernize critical systems while shaping a potential transition to a unified React Native platform.
Growth: Leadership development, career advancement, and exposure to modern technology and evolving mobile strategies.
Culture: Inclusive, collaborative, and innovation-driven.
Career Paths: Multiple advancement opportunities available.

How You'll Spend Your Time

Modern Software Development

  • Design & Build: Architect and implement cross-platform mobile applications using React Native and TypeScript, following best practices for performance, accessibility, and maintainability.
  • Mobile Architecture: Deliver features using scalable React Native architecture patterns, shared component libraries, and modular design approaches that support long-term maintainability and reuse.
  • Integration & Networking: Implement robust API integrations and handle authentication and authorization for secure, scalable mobile applications.


AI Agentic-First Engineering

  • Develop using AI-assisted workflows with tools such as GitHub Copilot and Claude to accelerate coding, refactoring, documentation, and test generation.
  • Leverage agentic patterns for multi-step tasks such as feature scaffolding, modernization efforts, UI generation, dependency analysis, and CI/CD interactions, with appropriate human oversight.
  • Apply AI-assisted pull request reviews and security scanning, validating outputs with strong engineering judgment and secure-by-design principles.
  • Continuously evaluate and improve the use of AI tools across the SDLC to increase throughput, quality, and developer experience.

Quality, Delivery & Operations

  • Quality Engineering: Own testing strategy, including unit and integration testing using JavaScript/TypeScript frameworks (e.g., Jest, React Testing Library), along with mobile end-to-end testing approaches where appropriate.
  • CI/CD & Automation: Shape mobile CI/CD pipelines supporting React Native builds and deployments using tools such as Fastlane, CircleCI, or equivalent.
  • Observability & Performance: Instrument applications using tools such as Firebase and New Relic to monitor performance, crash rates, and user behavior.
  • Security by Design: Follow secure coding practices and address vulnerabilities proactively; familiarity with PCI and SOX environments is beneficial.
  • Technical Leadership: Lead design reviews, mentor team members, and enforce high standards for code quality and maintainability.
  • Operate What You Build: Practice full ownership from development through production, supporting a build-it/run-it model.
Education & Experience Requirements

This level of knowledge is normally acquired through the completion of a bachelor's degree in a technology-related field and/or 8+ years of related experience. Technology certifications are preferred. Experience in banking or financial services is also preferred.

Must-Have
5-8+ years of software engineering experience, including significant experience building cross-platform mobile applications using React Native (TypeScript)
Proven experience delivering React Native applications end-to-end, including architecture, development, and deployment
Strong understanding of modern mobile application architecture patterns
Production experience integrating with RESTful APIs
Strong testing discipline, CI/CD experience, and code review best practices
Experience with mobile release processes and production support

Nice-to-Have
Native mobile development experience (Android and/or iOS)
Experience with mobile CI/CD automation (e.g., Fastlane) or feature flag systems
Experience with accessibility standards and internationalization
Familiarity with AI-assisted development tools (GitHub Copilot, Amazon Q, Claude)
Exposure to DevSecOps practices
PCI and SOX awareness

BOK Financial Corporation Group is a stable and financially strong organization that provides excellent training and development to support building the long term careers of employees. With passion, skill and partnership you can make an impact on the success of the bank, customers and your own career!  
Apply today and take the first step towards your next career opportunity!
The companies in BOK Financial Corporation Group are equal opportunity employers.  We are committed to providing equal employment opportunities for training, compensation, transfer, promotion and other aspects of employment for all qualified applicants and employees without regard to sex, race, color, religion, national origin, age, disability, pregnancy status, sexual orientation, genetic information or veteran status.

Please contact recruiting_coordinators@bokf.com with any questions. 

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