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Jr Developer Jobs in Belleville, IL (NOW HIRING)

Atria Group LLC

Java Developer

Saint Louis, MO

$49.50 - $64.25/hr

Our company provides application analysis, design, development and programming, software engineering, systems development, testing, integration, and implementation, and management consulting services ...

Meridian Systematics

Software Developer

Saint Louis, MO · On-site

$90K - $110K/yr

Software Developer Position Overview We are seeking an experienced Software Developer to support the Geospatial Services & Solutions (GSS) business area in delivering high-quality, cost-effective ...

Meridian Systematics

Software Developer

Saint Louis, MO · On-site

$90K - $110K/yr

Software Developer Position Overview We are seeking an experienced Software Developer to support the Geospatial Services & Solutions (GSS) business area in delivering high-quality, cost-effective ...

Meridian Systematics

Software Developer

Saint Louis, MO · On-site

$90K - $110K/yr

  • Medical

  • Dental

  • PTO

Parental leave Software Developer Position Overview We are seeking an experienced Software Developer to support the Geospatial Services & Solutions (GSS) business area in delivering high-quality ...

Booz Allen Hamilton

Agentic AI Developer

O Fallon, IL · On-site

$99K - $225K/yr

  • Medical

  • Life

  • Retirement

  • PTO

R0241538 Agentic AI Developer The Opportunity: As an experienced engineer, you know that machine learning is critical to understanding and processing massive datasets. Your ability to conduct ...

Stifel

Developer II

Saint Louis, MO · On-site

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

The Developer II will begin to learn cross-disciplinary development skills in a full-stack environment. The Developer II will ensure that Stifel's best practices are used in all development projects ...

Apex Informatics

Java Developer

Saint Louis, MO · On-site

$49.50 - $64.25/hr

Java Developer Location: St Louis, MO * 10+ years of hands-on software engineering experience * Excellent hands-on experience in Java * Experience in developing REST services. * Experience in unit ...

GDIT

Dashboard Developer, Mid-Level

Scott Air Force Base, IL · On-site

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Data Science and Data Engineering Job Qualifications: Skills: Business Intelligence Dashboards, Data Analytics, Data Science Certifications: None Experience: 2 + years of related experience US ...

Sovereign Technologies

C# Web Developer

Saint Louis, MO · On-site

As a Web Developer, work with members of a Scrum / Agile project team to develop the site concept, interface design, and architecture of the company website. Under general direction, you will design ...

D&G Support Services, LLC

Software Developer

Saint Louis, MO · On-site

$125K - $150K/yr

  • Retirement

  • PTO

Software Developer On Site | Scott AFB, IL | Secret Clearance Required If you enjoy building modern data solutions, integrating complex data environments, and supporting mission-critical decision ...

Booz Allen Hamilton, Inc.

Agentic AI Developer

O Fallon, IL · On-site +1

$99K - $225K/yr

  • Medical

  • Life

  • Retirement

  • PTO

Share Agentic AI Developer The Opportunity: As an experienced engineer, you know that machine learning is critical to understanding and processing massive datasets. Your ability to conduct ...

ECS

Senior Software Developer

O Fallon, IL · On-site

$110K - $120K/yr

Everforth ECS is seeking a Senior Software Developer to work in our O'Fallon, IL office. ECS Federal LLC is looking for a Senior Software Developer who possesses and applies expertise on multiple ...

New

Booz Allen Hamilton, Inc.

Agentic AI Developer

O Fallon, IL · On-site

$99K - $225K/yr

  • Medical

  • Life

  • Retirement

  • PTO

Agentic AI Developer The Opportunity: As an experienced engineer, you know that machine learning is critical to understanding and processing massive datasets. Your ability to conduct statistical ...

Booz Allen Hamilton

Agentic AI Developer

O Fallon, IL · On-site

$99K - $225K/yr

  • Medical

  • Life

  • Retirement

  • PTO

Agentic AI Developer The Opportunity: As an experienced engineer, you know that machine learning is critical to understanding and processing massive datasets. Your ability to conduct statistical ...

The Timberline Group

Lead Software Developer

Saint Louis, MO · On-site +1

$112K - $141K/yr

The Lead IT Software Developer is a well-rounded expert on the team in Front-End frameworks (Aurelia, Angular and such) and Back-End (Microsoft SQL and C#/.NET). He / She is the go-to person for any ...

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Showing results 21-40

All JobsJr Developer JobsJr Developer Jobs in Belleville, IL

Jr Developer information

See Belleville, IL salary details

$23.3K

$86.4K

$133.6K

How much do jr developer jobs pay per year?

As of Aug 16, 2026, the average yearly pay for jr 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 is a jr developer?

Jr Developers, or Junior Developers, are entry-level professionals in the software development field. They typically have less experience than mid-level or senior developers and are responsible for writing, testing, and maintaining code under the guidance of more experienced team members. Jr Developers often work on smaller tasks, bug fixes, or simple features, and are expected to learn and grow their technical skills through mentorship and hands-on experience. Their role is essential for building a solid foundation in software development and contributing to the success of development projects.

What does a junior developer do?

A junior developer assists in designing, coding, testing, and maintaining software applications under the supervision of senior developers. They typically work with programming languages like Java, Python, or JavaScript and use development tools such as version control systems. Their role involves learning best practices and gaining experience in software development processes.

How much does a junior developer get paid?

A junior developer typically earns between $50,000 and $70,000 annually, depending on location, industry, and skills. Entry-level roles often require knowledge of programming languages like JavaScript, Python, or Java, and may include benefits such as training and mentorship.

What are some common challenges a jr developer might face when joining a new team, and how can they overcome them?

As a Jr Developer, one of the most common challenges is adapting to unfamiliar codebases and workflows. It can be daunting to understand existing projects and navigate team-specific tools and processes. To overcome this, Jr Developers should proactively seek help from team members, take thorough notes, and dedicate time to reviewing documentation and code. Embracing code reviews and asking questions will not only accelerate learning but also help build relationships within the team.

What is the difference between Jr Developer vs Junior Software Engineer?

AspectJr DeveloperJunior Software Engineer
Required CredentialsTypically an associate degree or coding bootcamp certificationUsually a bachelor's degree in computer science or related field
Work EnvironmentEntry-level, supervised tasks, learning-focusedSimilar entry-level environment, often with more complex project involvement
Employer & Industry UsageCommon in tech companies, startups, and IT departmentsUsed interchangeably in many companies, especially in software development teams
Search & Comparison IntentYes, often compared for entry-level rolesYes, often searched as a more formal or technical title

While both roles are entry-level software development positions, a Jr Developer often emphasizes basic coding tasks and learning, whereas a Junior Software Engineer may involve more structured engineering responsibilities. The titles are frequently used interchangeably, but understanding the specific job description can clarify expectations.

What are the key skills and qualifications needed to thrive as a jr developer?

To thrive as a Jr Developer, you need a foundational understanding of programming languages (such as JavaScript, Python, or Java), basic software development principles, and often a relevant degree or coding bootcamp certification. Familiarity with version control systems like Git, IDEs, and workflow tools like Jira or Trello is typically required. Strong problem-solving skills, effective communication, and eagerness to learn help Jr Developers stand out in the workplace. These abilities are crucial for efficiently contributing to team projects, adapting to new technologies, and growing within a dynamic development environment.

What are popular job titles related to Jr Developer jobs in Belleville, IL?

For Jr Developer jobs in Belleville, IL, the most frequently searched job titles are:

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

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

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

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

Jr Developer jobs near you
Infographic showing various Jr Developer job openings in Belleville, IL as of August 2026, with employment types broken down into 79% Full Time, 5% Part Time, 14% Contract, and 2% Nights. Highlights an 81% Physical, 4% Hybrid, and 15% Remote job distribution, with an average salary of $86,422 per year, or $41.5 per hour.

Java Developer

Atria Group LLC

Saint Louis, MO

$49.50 - $64.25/hr

Contractor

Re-posted 28 days ago

Job description

Company Description

We specialize in Staffing, Consulting, Software Development, and Training along with IT services to small to medium size companies. AG's primary objective is to help companies maximize their IT resources and meet the ever-changing IT needs and challenges.

In addition, AG offers enterprise resource planning and enterprise application integration, supply-chain management, e-commerce solutions, and B2B public exchanges and B2B process integration solutions. Our company provides application analysis, design, development and programming, software engineering, systems development, testing, integration, and implementation, and management consulting services to various clients - including governmental agencies and private companies - throughout the United States and India.

We provide these services in multiple computing environments and use technologies such as client/server architecture, object-oriented programming languages and tools, distributed database management systems, state-of-the-art networking, and communications infrastructures. Our honest and realistic approach to recruiting dictates that AG does not entice or lure engineers from their employers. We represent only high caliber technical professionals who have committed to making a change required by career.

Job Description

Required Skills: 

5+ years advanced computer programming skills in Java, Java Servlet, Javabean, EJB, OO Design, HTML. Advanced working skills in programming with SQL or Oracle. Experience writing JUnit test-cases and building test-suites. 5+ years of experience in systems analysis and working closely with business customer Significant working knowledge with the RAD/Eclipse/WebSphere Familiarity with J2EE technology, such as JNDI, JMS, RMI, JNDI, XML, XSL, XSL-FO and JDBC Experience with code versioning and change management concepts Experience with full life-cycle software applications development (i.e., design, construction, testing, and implementation) Experience with requirements definition and specifications design Experience analyzing functional requirements in Sprints to write component detailed design technical documents. Able to design and build systems that are integrated with other client systems Demonstrates an expert level of proficiency in the use of computer languages and utilities necessary to support application development Preferred Skills: Able to perform the complete system life cycle using the Agile Scrum Methodology phases from project initiation, analysis and requirements, design, coding, testing and implementation Able to adhere to client development standards and SOX compliance Ability to communicate to a wide variety of audiences, both business and technical Proven ability to develop and maintain system documentation Ability to work independently with minimal direction Bachelor s degree or equivalent

Additional Information

GOOD COMMUNICATION SKILLS

DURATION: 6+ Months Contract

INTERVIEW: Telephonic and Skype / Face 2 face

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