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Mobile Application Developer Jobs in O Fallon, IL

***.NET DEVELOPERS***

Saint Louis, MO ยท On-site

$47 - $62/hr

NET DEVELOPER - we are recruiting for future openings at client companies/agencies. This job might ... mobile-friendly application by clicking on "I'm Interested." It only takes 1-2 minutes! When you ...

***.NET DEVELOPERS***

Saint Louis, MO ยท On-site

$47 - $62/hr

NET DEVELOPER - we are recruiting for future openings at client companies/agencies. This job might ... mobile-friendly application by clicking on "I'm Interested." It only takes 1-2 minutes! When you ...

Software Developer

Saint Louis, MO ยท On-site

$90K - $110K/yr

Software Developer Position Overview We are seeking an experienced Software Developer to support ... Design and maintain application code across development, test, production, and on-premises/data ...

Software Developer

Saint Louis, MO ยท On-site

$90K - $110K/yr

Parental leave Software Developer Position Overview We are seeking an experienced Software ... Design and maintain application code across development, test, production, and on-premises/data ...

Software Developer

Saint Louis, MO ยท On-site

$90K - $110K/yr

Software Developer Position Overview We are seeking an experienced Software Developer to support ... Design and maintain application code across development, test, production, and on-premises/data ...

Louis, MO . The Software Engineer I supports Desktop application development, database interaction, Microprocessor Embedded code, and internal equipment development. Work within a team, from ...

... in application development, mobile computing, systems and sensor integration, enterprise ... In addition to technical skills you will also be relied on to coach teams through their Agile/DevOp ...

... in application development, mobile computing, systems and sensor integration, enterprise ... In addition to technical skills you will also be relied on to coach teams through their Agile/DevOp ...

... application programming interface (API) management solutions * 2+ years of experience administering ... We seek professionals who can harness the latest in social, mobile, and analytics technologies to ...

IT Service Management (ITSM)

Saint Louis, MO

$52.50 - $72.25/hr

... Planning (Oracle/SAP), SMAC (Social, Mobile, Cloud, Analytics), Business Intelligence ... Remedy Developer Studio to customize forms, fields, overlay, workflows and related system ...

IT Service Management (ITSM)

Saint Louis, MO ยท On-site

$52.50 - $72.25/hr

... Planning (Oracle/SAP), SMAC (Social, Mobile, Cloud, Analytics), Business Intelligence ... Remedy Developer Studio to customize forms, fields, overlay, workflows and related system ...

Our software engineering positions provide you the opportunity to join a team of talented engineers ... Perform general application development activities, including unit testing, code deployment to ...

Oracle Technical Cloud Senior Consultant

Saint Louis, MO ยท On-site

$61.75 - $77.75/hr

... application programming interface (API) management solutions * 1+ year of experience working with ... We seek professionals who can harness the latest in social, mobile, and analytics technologies to ...

Showing results 41-60

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.

Software/Web Developer with Security Clearance

Kentro

Saint Louis, MO โ€ข On-site

Other

Medical, Retirement, PTO

Re-posted 21 days ago


Job description

Overview Thank you for considering IT Concepts dba Kentro, where innovation drives opportunity and collaboration leads to success. Our dynamic community of experts is fully committed to advancing our customers' missions, fostering professional growth, and making a positive impact on our communities. By joining our supportive community, you will find that Kentro is dedicated to your personal and professional development. Together, we can drive meaningful change, spark innovation, and achieve extraordinary milestones. Kentro is always interested in connecting with talented Software and Web Developers who are passionate about building scalable applications, developing modern user experiences, and supporting innovative technology solutions. Ideal candidates bring strong technical expertise, problem-solving abilities, and experience collaborating across teams to deliver high-quality software solutions in fast-paced environments. This application is for a talent pipeline and is not tied to an active job opening. By applying, you are expressing interest in future opportunities that match your skills and experience. O ur team regularly reviews resumes for both immediate and upcoming openings. If your background aligns with a current or future position, we'll be in touch. Location: Onsite in St. Louis, MO Responsibilities You may be a great fit if you have experience with: * Designing, developing, testing, and maintaining web applications, software platforms, or enterprise systems. * Building responsive and user-friendly front-end applications using modern frameworks and technologies. * Developing back-end services, APIs, and integrations to support scalable and secure applications. * Writing clean, maintainable, and efficient code following development best practices and coding standards. * Collaborating with cross-functional teams including developers, designers, project managers, cybersecurity teams, and stakeholders. * Supporting Agile/SCRUM software development methodologies and participating in sprint planning, standups, and retrospectives. * Troubleshooting, debugging, and resolving software defects and performance issues. * Working with databases, data models, and application integrations. * Supporting CI/CD pipelines, automated testing, and DevOps practices. * Managing multiple competing priorities while delivering high-quality technical solutions within project timelines. * Developing applications within cloud, enterprise, or regulated environments. Qualifications * Bachelor's degree in Computer Science, Software Engineering, Information Technology, or related field, or equivalent experience. * 3+ years of experience in software development, web development, or application engineering roles. * Experience with one or more programming languages such as JavaScript, TypeScript, Python, Java, C#, PHP, or similar technologies. * Experience developing modern web applications using front-end frameworks such as React, Angular, or Vue. * Familiarity with back-end development frameworks, RESTful APIs, and database technologies. * Strong analytical, troubleshooting, and problem-solving skills. * Highly polished communication and collaboration skills. * Ability to work independently and collaboratively within fast-paced development environments. Nice to Haves * Active U.S. security clearance (or eligibility to obtain one) * Experience with cloud platforms such as AWS, Azure, or Google Cloud. * Familiarity with DevOps tools, CI/CD pipelines, and automated testing frameworks. * Experience working with SQL and/or NoSQL databases. * Knowledge of cybersecurity best practices and secure software development principles. * Experience supporting enterprise, government, or regulated environments. * Familiarity with containerization technologies such as Docker or Kubernetes. Benefits The Company We believe in generating success collaboratively, enabling long-term mission success, and building trust for the next challenge. With you as our partner, let's solve challenges, think innovatively, and maximize impact. As a valued member of our team, you have the unique opportunity to work in a diverse range of technology and business career paths, all while supporting our nation and delivering innovative technology solutions. We are a close community of experts that pride ourselves on creating an environment defined by teamwork, dedication, and excellence. We hold three ISO certifications (27001:2013, 20000-1:2011, 9001:2015), two CMMI ML 3 ratings (DEV and SVC) and CMMC Level 2 Certification. Industry Recognition Growth | Inc 5000's Fastest Growing Private Companies, DC Metro List Fastest Growing; Washington Business Journal: Fastest Growing Companies, Top Performing Small Technology Companies in Greater D.C. Culture | Northern Virginia Technology Council Tech 100 Honoree; Virginia Best Place to Work; Washington Business Journal: Best Places to Work, Corporate Diversity Index Winner - Mid-Size Companies, Companies Owned by People of Color; Department of Labor's HireVets for our work helping veterans transition; SECAF Award of Excellence finalist; Victory Military Friendly Brand; Virginia Values Veterans (V3); Cystic Fibrosis Foundation Corporate Breath Award Benefits We offer competitive benefits package including paid time off, healthcare benefits, supplemental benefits, 401k including an employer match, discount perks, rewards, and more. We invest in our employees - Every employee is eligible for education reimbursement for certifications, degrees, or professional development. Reimbursement amounts may fluctuate due to IRS limitations. We want you to grow as an expert and a leader and offer flexibility for you to take a course, complete a certification, or other professional growth and networking. We are committed to supporting your curiosity and sustaining a culture that prioritizes commitment to continuous professional development. We work hard; we play hard. Kentro is committed to incorporating fun into every day. We dedicate funds for activities - virtual and in-person - e.g., we host happy hours, holiday events, fitness & wellness events, and annual celebrations. In alignment with our commitment to our communities, we also host and attend charity galas/events. We believe in appreciating your commitment and building a positive workspace for you to be creative, innovative, and happy. Commitment Equal Opportunity Employment & VEVRAA Kentro is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to disability, status as a protected veteran or any other status protected by applicable federal, state or local law. Kentro is strongly committed to compliance with VEVRAA and other applicable federal, state, and local laws governing equal employment opportunity. We have developed comprehensive policies and procedures to ensure our hiring practices align with these requirements. As part of our VEVRAA compliance efforts, Kentro has established an equal opportunity plan outlining our commitment to recruiting, hiring, and advancing protected veterans. This plan is regularly reviewed and updated to ensure its effectiveness. We encourage protected veterans to self-identify during the application process. This information is strictly confidential and will only be used for reporting and compliance purposes as required by law. Providing this information is voluntary and will not impact your employment eligibility. Our commitment to equal employment opportunity extends beyond legal compliance. We are dedicated to fostering an inclusive workplace where all employees, including protected veterans, are treated with dignity, respect, and fairness. How to Apply To apply to Kentro Positions- Please click on the job link and then click the blue "Apply" button at the top right of Job Description. Please upload your resume and complete all the application steps. You must fully submit the application for Kentro to consider you for a position. If you need alternative application methods, please email and request assistance. Accommodations To perform this job successfully, an individual must be able to perform each essential duty satisfactorily. Reasonable Accommodations may be made to enable qualified individuals with disabilities to perform the essential functions. If you need to discuss reasonable accommodations, please email . #LI-BW1