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Jr Developer Jobs in Belleville, IL (NOW HIRING)

MarketVolt

Software Developer

Saint Louis, MO · On-site

NET Software Developer / Software Engineer / Web Application Developer MarketVolt, LLC, a digital marketing software and services firm based in St. Louis, seeks a creative software developer who can ...

Marketvolt

Software Developer

Saint Louis, MO · On-site

NET Software Developer / Software Engineer / Web Application Developer MarketVolt, LLC, a digital marketing software and services firm based in St. Louis, seeks a creative software developer who can ...

Atria Group LLC

Java Developer

Saint Louis, MO · On-site

$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 ...

Build-A-Bear Workshop

Developer

Saint Louis, MO · On-site

As a Developer, you will play a pivotal role in transforming business needs into innovative, scalable software solutions. In this hands-on, individual contributor role, you'll drive the software ...

Atria Group LLC

Java Developer

Saint Louis, MO · On-site

$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 ...

Booz Allen Hamilton

Agentic AI Developer

O Fallon, IL · On-site

$99K - $225K/yr

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 ...

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 ...

Meridian Systematics

Software Developer

Saint Louis, MO · On-site

$90K - $110K/yr

Software Developer - Enterprise Geospatial Solutions Location: On-Site About the Role Join our Geospatial Services & Solutions (GSS) team to build high-performance, cost-effective software ...

Meridian Systematics

Software Developer

Saint Louis, MO · On-site

$90K - $110K/yr

Software Developer - Enterprise Geospatial Solutions Location: On-Site About the Role Join our Geospatial Services & Solutions (GSS) team to build high-performance, cost-effective software ...

Meridian Systematics

Software Developer

Saint Louis, MO · On-site

$90K - $110K/yr

Vision insurance Software Developer - Enterprise Geospatial Solutions Location: On-Site About the Role Join our Geospatial Services & Solutions (GSS) team to build high-performance, cost-effective ...

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 ...

Booz Allen Hamilton

Agentic AI Developer

O Fallon, IL · On-site

$99K - $225K/yr

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 ...

Worky

Senior Software Developer

O Fallon, IL · On-site

$110 - $120/hr

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 ...

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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 Sep 6, 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 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 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.

How hard is it to get a junior developer job?

Securing a junior developer position typically requires foundational programming skills, a portfolio of projects, and familiarity with relevant tools like Git and common programming languages. Entry-level roles are often competitive, but candidates with relevant internships, certifications, or coding bootcamp experience have better chances of being hired.

How to get hired as a junior developer?

To get hired as a junior developer, build a strong foundation in programming languages like JavaScript, Python, or Java, and create a portfolio of projects to demonstrate your skills. Gaining experience through internships, coding bootcamps, or contributing to open-source projects can improve your chances, along with obtaining relevant certifications and preparing for technical interviews.

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, 10% Part Time, and 11% Contract. Highlights an 81% Physical, 5% Hybrid, and 14% Remote job distribution, with an average salary of $86,422 per year, or $41.5 per hour.

Software Developer

MarketVolt

Saint Louis, MO • On-site

Full-time

Medical, Retirement, PTO

Re-posted 6 days ago

Job description

C# .NET Software Developer / Software Engineer / Web Application Developer MarketVolt, LLC, a digital marketing software and services firm based in St. Louis, seeks a creative software developer who can thrive in a fast-paced, customer-driven environment. We're an established but small company with an aggressive growth plan

Our culture is dynamic and we are looking for candidates with an entrepreneurial attitude. We offer competitive salary and a benefits package that includes 100% company-paid health insurance, simple IRA with company match, and paid vacation, holiday and sick time. Our team collaborates on everything from user interface design to sales support.

So, the developer who joins our team will have: The mental agility to rapidly shift between different roles and perspectives - programmer, architect, customer. The ability to constructively contribute to a collaborative work environment. The intellectual confidence to analyze and debate ideas and designs.

The ability to assess and balance business drivers and customer needs. The ideal candidate will have a solid educational background and ideally 2+ years of post-college software development experience building robust, scalable, web-based software solutions. This individual does not shy away from challenges and enjoys working in a collaborative, fast paced, team oriented environment.

What you will be doing - Maintaining existing web applications and services - Designing and delivering robust, web applications and services to support our business - Collaborating with the customer support team to resolve customer reported issues - Assisting with infrastructure maintenance and support - Utilizing Agile software development practices - Iteratively and incrementally improving products and processes What we are looking for - Preferred BS/MS in Computer Science or related degree - 2+ years programming experience building enterprise web solutions - 1+ years of experience with Microsoft C#, .NET, MVC, SQL Server and agile practices - Experience developing web based software services and custom web server controls - Working knowledge of version control preferably with git The technologies you'll be working with Visual Studio 2017, C#, .NET Framework, ASP.NET MVC 3 or 4, ASP.NET, JavaScript, HTML, CSS, NHibernate, MS SQL Server, WCF, XML/XSL, SOAP/REST, JSON, AJAX, Web Services, Fluent Migrator, MongoDB, RabbitMQ, PowerMTA, Dependency Injection/Inversion of Control (Unity), NUnit, Ruby, AWS, Rackspace. If you are a talented Software Developer / Software Engineer with a passion for problem solving, please apply today. (Principals only, please)

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