ZipRecruiter

Log In

1

Web Application Developer Ii Jobs in O Fallon, IL

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 ...

Esri

Application Developer - JavaScript

Saint Louis, MO · On-site

$83K - $141K/yr

Overview We are seeking an Application Developer to join Esri's Geo Experience Center team, where ... * 2+ years of experience developing web applications using JavaScript; TypeScript experience ...

next page

Showing results 1-20

All JobsWeb Application Developer Ii JobsWeb Application Developer Ii Jobs in O'Fallon, IL

Web Application Developer Ii information

See O Fallon, IL salary details

$20.5K

$91.9K

$142.7K

How much do web application developer ii jobs pay per year?

As of Aug 10, 2026, the average yearly pay for web application developer ii in O'Fallon, IL is $91,894.00, according to ZipRecruiter salary data. Most workers in this role earn between $73,700.00 and $111,500.00 per year, depending on experience, location, and employer.

How does a Web Application Developer II typically collaborate with designers and backend developers during a project?

As a Web Application Developer II, you will often act as a bridge between UI/UX designers and backend developers. You’ll work closely with designers to translate wireframes and mockups into interactive, functional web components, ensuring design fidelity and usability. Simultaneously, you’ll collaborate with backend teams to integrate APIs, manage data flow, and troubleshoot issues that arise during development. Effective communication and teamwork are crucial in this role, as you’ll regularly participate in stand-ups, code reviews, and sprint planning sessions to ensure seamless project delivery.

What does a Web Application Developer II do?

A Web Application Developer II is a mid-level software professional who designs, develops, tests, and maintains web-based applications. They work closely with other developers, designers, and stakeholders to implement new features, optimize performance, and fix bugs. This role typically requires a solid understanding of programming languages like JavaScript, HTML, and CSS, along with backend technologies such as Node.js, PHP, or Python. Web Application Developer IIs are also expected to follow best coding practices and may mentor junior developers.

What are the key skills and qualifications needed to thrive as a Web Application Developer II?

To thrive as a Web Application Developer II, you need strong proficiency in programming languages such as JavaScript, HTML, CSS, and backend frameworks, often supported by a relevant degree or equivalent experience. Familiarity with version control systems like Git, cloud platforms, and modern development tools such as React or Angular is typically required. Effective problem-solving, collaboration, and communication skills help developers excel in team-based environments and adapt to changing project needs. These skills ensure the timely delivery of robust, user-friendly web applications and facilitate seamless teamwork in dynamic tech settings.
What are popular job titles related to Web Application Developer Ii jobs in O'Fallon, IL? For Web Application Developer Ii jobs in O'Fallon, IL, the most frequently searched job titles are:
What job categories do people searching Web Application Developer Ii jobs in O'Fallon, IL look for? The top searched job categories for Web Application Developer Ii jobs in O'Fallon, IL are:
Web Application Developer Ii jobs near you
Infographic showing various Web Application Developer Ii job openings in O'Fallon, IL as of August 2026, with employment types broken down into 82% Full Time, 14% Part Time, and 4% Contract. Highlights an 92% Physical, 2% Hybrid, and 6% Remote job distribution, with an average salary of $91,894 per year, or $44.2 per hour.

Application Developer II

Cass Information Systems Inc.

Bridgeton, MO

Full-time

Re-posted 3 days ago

Job description

The Application Developer II is responsible for the development and deployment of technology to meet the needs and requirements of Cass. This position will handle fixing system bugs of simple to medium complexity and will develop system enhancements or assist others on larger more complex enhancements.

PRINCIPAL RESPONSIBILITIES AND DUTIES:

  • Participates in the planning, design, and implementation effort as assigned by the business or IT management.
  • Develops and maintains modules based on technical designs and development standards.
  • Remediates production bugs/defects as assigned.
  • Supports quality assurance testing to confirm that acceptance criteria are met.
  • Recommends changes to the processes, techniques, and technology to improve product quality, work efficiency, system performance and workload balance.
  • Mentors junior development team members when needed.
  • Participates in brainstorming, discussion, and estimation sessions.
  • Performs other duties as assigned.

SKILLS AND ABILITIES REQUIRED:

  • Strong communication skills both written (technical documentation) and verbal (presentations to IT team members and other division teams).
  • Ability to multi-task while still maintaining an attention to detail.
  • Have a solid understanding of telecommunications carrier billing standards and formats.
  • Knowledge of OOP design and patterns.
  • Knowledge of Core, Web, and MVC.
  • Knowledge of Micro Services Architecture.
  • Knowledge of cloud services (Azure preferred).
  • Experience using DevOps and Agile practices.

MINIMUM LEVEL OF PREPARATION AND TRAINING NORMALLY REQUIRED:

    • Bachelor’s degree in computer science or software engineering, or equivalent work experience.
    • 3-5 years of experience as a developer utilizing modern C#, Visual Studio, SQL 2012+.

    APPLICATION PROCESS:

    You can directly apply through Cass's website at https://www.cassinfo.com/careers. Please apply directly to this position via the “Apply” button. You will be required to create an account and provide your resume, contact information and other pertinent employment information. This process typically takes 20 minutes or less. Should we find that you meet the minimum requirement of the position, a member of our recruiting team will be in touch to start the interview process.

    ABOUT OUR COMPANY:

    Cass Information Systems, Inc. (NASDAQ: CASS) is a leading provider of integrated information and payment management solutions. Cass enables enterprises to achieve visibility, control and efficiency in their supply chains, communication networks, facilities, and other operations. Disbursing over $94 billion annually on behalf of its clients, and with total assets of $2.5 billion, Cass is uniquely supported by Cass Commercial Bank. Founded in 1906 and a wholly-owned subsidiary, Cass Commercial Bank provides sophisticated financial exchange services to the parent organization and its clients. Cass is part of the Russell 2000®. More information is available at www.cassinfo.com.

    Apply