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Junior Application Developer Jobs in Belleville, IL

The Timberline Group

Xamarin Developer

Saint Louis, MO · On-site +1

Role Summary The Web Application Developer's responsibilities may include: * Providing team ... Mentor and develop junior team members. What we need you to bring to the table: * Xamarin * . NET 4 ...

Stifel

AI-Application Security Engineer

Saint Louis, MO · On-site

$57 - $76.25/hr

Leverage AI and automation to scale security operations, vulnerability management, and developer ... Contribute to a strong security engineering culture by mentoring junior engineers, sharing ...

Stifel

AI-Application Security Engineer

Saint Louis, MO · On-site

$57 - $76.25/hr

Leverage AI and automation to scale security operations, vulnerability management, and developer ... Contribute to a strong security engineering culture by mentoring junior engineers, sharing ...

Stifel

AI-Application Security Engineer

Saint Louis, MO · On-site

$57 - $76.25/hr

Leverage AI and automation to scale security operations, vulnerability management, and developer ... Contribute to a strong security engineering culture by mentoring junior engineers, sharing ...

Nooter/Eriksen

Jr. Accountant

Fenton, MO · On-site

$45K - $57K/yr

Consider joining a talented team of engineering professionals at Nooter/Eriksen Inc. We are an OEM ... Our application is quick and should take you less than 5 minutes to fill out. Your information will ...

Nooter/Eriksen

Jr. Accountant

Fenton, MO · Hybrid

$45K - $57K/yr

Consider joining a talented team of engineering professionals at Nooter/Eriksen Inc. We are an OEM ... Our application is quick and should take you less than 5 minutes to fill out. Your information will ...

Nooter/Eriksen

Jr. Accountant

Fenton, MO · On-site

$45K - $57K/yr

Consider joining a talented team of engineering professionals at Nooter/Eriksen Inc. We are an OEM ... Our application is quick and should take you less than 5 minutes to fill out. Your information will ...

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All JobsApplication Developer JobsJunior Application Developer JobsJunior Application Developer Jobs in Belleville, IL

Junior Application Developer information

See Belleville, IL salary details

$23.3K

$86.4K

$133.6K

How much do junior application developer jobs pay per year?

As of Aug 28, 2026, the average yearly pay for junior application developer in Belleville, IL is $86,422.00, according to ZipRecruiter salary data. Most workers in this role earn between $65,100.00 and $84,500.00 per year, depending on experience, location, and employer.

What does a junior application developer do?

A Junior Application Developer assists in designing, coding, and testing software applications under the supervision of senior developers. They typically work on writing simple code, fixing bugs, and learning the best practices of software development. Their role often involves collaborating with other team members, participating in code reviews, and continuously improving their programming skills. This position is ideal for individuals who are early in their software development careers and looking to gain hands-on experience in application development.

What are some common challenges faced by junior application developers when transitioning from academic projects to real-world applications?

Junior Application Developers often find that real-world projects involve more complex codebases, stricter deadlines, and frequent collaboration with cross-functional teams compared to academic assignments. They may also encounter challenges in understanding legacy code, adhering to industry best practices, and using version control systems like Git in a team environment. Seeking mentorship, asking questions, and participating in code reviews can help ease this transition and accelerate learning.

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

To thrive as a Junior Application Developer, you need a solid understanding of programming languages (such as Java, Python, or JavaScript), software development principles, and a relevant degree or equivalent experience. Familiarity with version control systems like Git, integrated development environments (IDEs), and possibly certifications in specific technologies are often required. Strong problem-solving skills, willingness to learn, and effective communication set outstanding candidates apart. These skills and qualities are essential for delivering high-quality code, collaborating on development teams, and adapting to rapidly changing technical requirements.

How to get hired as a junior application developer?

To get hired as a junior application developer, candidates should have a solid understanding of programming languages such as Java, Python, or JavaScript, and demonstrate basic knowledge of software development processes. Building a portfolio of projects, gaining relevant internships, and obtaining certifications like Microsoft Technology Associate or Oracle Java Certification can improve employability. Strong problem-solving skills and familiarity with development tools like Git and IDEs are also important for entry-level roles.

What job categories do people searching Junior Application Developer jobs in Belleville, IL look for?

The top searched job categories for Junior Application Developer jobs in Belleville, IL are:

What cities near Belleville, IL are hiring for Junior Application Developer jobs?

Cities near Belleville, IL with the most Junior Application Developer job openings:

Junior Application Developer jobs near you
Infographic showing various Junior Application Developer job openings in Belleville, IL as of August 2026, with employment types broken down into 81% Full Time, 15% Part Time, and 4% Contract. Highlights an 91% Physical, 3% Hybrid, and 6% Remote job distribution, with an average salary of $86,422 per year, or $41.5 per hour.

Application Developer II

Bridgeton, MO • On-site

Cass Information Systems, Inc.
Finance and Insurance • 1 - 5K employees
Learn more about Cass Information Systems, Inc.external

$70 - $90/hr

Other

Re-posted 21 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+.

Equal Opportunity Employer/Protected Veterans/Individuals with Disabilities.

This employer is required to notify all applicants of their rights pursuant to federal employment laws.

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