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Jr Developer Jobs in Alton, IL (NOW HIRING)

Pyramid IT

Java Developer

Saint Louis, MO · On-site

$49.50 - $64.25/hr

Java Developer Location - St. Louis, MO Duration: Long term contract Work Authorization status : US Citizen & Green card only Mandatory Skills: J2EE (Java, JSP, Servlets, Filters, Listeners, JSTL, EL ...

TecTammina

Drools / JBOSS Developer

Saint Louis, MO

$49.50 - $64.25/hr

Application Designer/Developer for Redhat DROOLS Business Rules Management System [BRMS]. Develop, test and deploy complex rules in DROOLS Fusion and DROOLS CEP Experience with configuring and ...

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 you will contribute to building prototype applications that explore digital cartography, advanced map ...

The Timberline Group

Java/J2EE Developer

Saint Louis, MO · On-site +1

$49.50 - $64.25/hr

Master's degree in Computer Science, Information Science, Electronic or Electrical Engineering or any related field of study, plus three (3) years of experience in the job offered or any related ...

lumos

Full-Stack Developer

Waynesboro, VA · Hybrid

$86K - $100K/yr

Developers work closely with analysts, engineers, and system users as needed to deliver well documented and tested solutions to the business. The position also requires integration with other ...

New

The Timberline Group

Java/Angular Developer

Saint Louis, MO · On-site +1

$49.50 - $64.25/hr

The developer will meet with clients, analyze client requirements, propose & construct solutions and develop B2B and B2C incentive and ecommerce applications. Basic Qualifications * Bachelor of ...

Arka Infotech Inc

Sr. Scala Developer

Saint Louis, MO · On-site

$53 - $70/hr

Sr. Scala Developer 12+ Months St. Louis, Missouri 08-03-2015 Senior Scala Developer w/hands-on experience writing Scala architecture on OS X and AWS models -- experience coding in Clojure, Java, and ...

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Showing results 41-60

All JobsJr Developer JobsJr Developer Jobs in Alton, IL

Jr Developer information

See Alton, IL salary details

$23.1K

$85.6K

$132.2K

How much do jr developer jobs pay per year?

As of Aug 13, 2026, the average yearly pay for jr developer in Alton, IL is $85,560.00, according to ZipRecruiter salary data. Most workers in this role earn between $64,400.00 and $83,700.00 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 cities near Alton, IL are hiring for Jr Developer jobs? Cities near Alton, IL with the most Jr Developer job openings:
Jr Developer jobs near you
Infographic showing various Jr Developer job openings in Alton, IL as of August 2026, with employment types broken down into 79% Full Time, 6% Part Time, and 15% Contract. Highlights an 84% Physical, 3% Hybrid, and 13% Remote job distribution, with an average salary of $85,560 per year, or $41.1 per hour.

Application Developer II

Cass Information Systems

Bridgeton, MO • On-site

Full-time

Re-posted 6 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. 

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