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Junior Software Developer Jobs in O Fallon, IL (NOW HIRING)

Eliassen Group

Senior Software Developer

Saint Louis, MO · On-site

$100 - $125/hr

Louis, MO Our client seeks a Senior Software Developer to support modernization and maintenance of a mission-critical enterprise application in AWS for the U.S. Treasury. The role requires full-stack ...

Rapsodo

Senior Software Developer

Saint Louis, MO · On-site

$53 - $70/hr

Powered by Athletes who get it, and Engineers who can do it. Role Purpose This role exists to be the connective tissue between cross-functional teams, translating complex system trade-offs into clear ...

Rapsodo

Senior Software Developer

Saint Louis, MO · On-site

$53 - $70/hr

Powered by Athletes who get it, and Engineers who can do it. Role Purpose This role exists to be the connective tissue between cross-functional teams, translating complex system trade-offs into clear ...

Rapsodo

Senior Software Developer

Saint Louis, MO · On-site

$53 - $70/hr

Powered by Athletes who get it, and Engineers who can do it. Role Purpose This role exists to be the connective tissue between cross-functional teams, translating complex system trade-offs into clear ...

CACI

DevOps Engineer - Junior

Saint Louis, MO · On-site

$51.25 - $70.25/hr

Job Title: DevOps Engineer - Junior Job Category: Engineering Time Type: Full time Minimum ... Work alongside software engineers, cybersecurity professionals, and system administrators to ...

Know Ink, LLC

Software Engineer III

Saint Louis, MO · On-site

NET Developer We are looking for a .Net developer to build software using languages and ... Able to assist and mentor junior level .NET developers Experience: * 3-6 years experience in .NET ...

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Junior Software Developer information

See O Fallon, IL salary details

$22.4K

$83K

$128.3K

How much do junior software developer jobs pay per year?

As of Sep 2, 2026, the average yearly pay for junior software developer in O'Fallon, IL is $82,997.00, according to ZipRecruiter salary data. Most workers in this role earn between $62,500.00 and $81,200.00 per year, depending on experience, location, and employer.

What does a junior software developer do?

A junior software developer works on a development team writing and maintaining code for computer applications. As a junior software developer, your primary responsibilities are to learn the codebase, work on small bug fixes, and participate in paired programming with mid-level and senior developers. Junior software developers are entry-level positions, but as you gain experience and build up your programming skills, you will start to take on larger projects. Your job duties include attending and contributing to development team meetings, troubleshooting, patching computer code, and collaborating with other developers to create applications.

What does a junior software developer do?

A Junior Software Developer is an entry-level professional who assists in designing, coding, testing, and maintaining software applications. They typically work under the supervision of more experienced developers and contribute to various stages of the software development lifecycle. Their responsibilities often include writing basic code, debugging, collaborating with team members, and learning new technologies to improve their skills. This role is a great starting point for individuals looking to build a career in software development.

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

To thrive as a Junior Software Developer, you need proficiency in programming languages (such as Python, Java, or JavaScript), algorithms, and problem-solving, often supported by a relevant degree or coding bootcamp experience. Familiarity with version control systems like Git, basic knowledge of databases, and experience with development frameworks are valuable technical assets. Strong communication, teamwork, and a willingness to learn help you adapt and contribute effectively in collaborative environments. These skills and qualities are essential for delivering reliable code, supporting team goals, and growing in a fast-evolving tech landscape.

What are some typical challenges a junior software developer might face when starting out, and how can they overcome them?

Junior Software Developers often encounter challenges such as understanding large codebases, managing their time effectively between learning and delivering tasks, and adapting to new development tools or frameworks. To overcome these hurdles, it's helpful to actively seek guidance from more experienced team members, participate in code reviews, and make consistent use of documentation. Regular communication within the team and a willingness to ask questions can significantly speed up the learning process and help build confidence in your role.

How much money do junior software developers make?

Junior software developers typically earn between $50,000 and $80,000 annually, depending on location, industry, and skills. Entry-level roles often require knowledge of programming languages like Java, Python, or JavaScript, and familiarity with development tools and frameworks.

How to get a junior software developer job with no experience?

To secure a junior software developer position with no experience, focus on building a portfolio through personal projects, contribute to open-source code, and learn relevant programming languages like Python or JavaScript. Gaining familiarity with version control tools such as Git and completing online courses or certifications can also improve your chances. Internships or apprenticeships can provide practical experience and industry exposure.
More about Junior Software Developer jobs

What are the most commonly searched types of Software Developer jobs in O'Fallon, IL?

The most popular types of Software Developer jobs in O'Fallon, IL are:

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For Junior Software Developer jobs in O'Fallon, IL, the most frequently searched job titles are:

What cities near O'Fallon, IL are hiring for Junior Software Developer jobs?

Cities near O'Fallon, IL with the most Junior Software Developer job openings:

Junior Software Developer jobs near you
Infographic showing various Junior Software Developer job openings in O'Fallon, IL as of August 2026, with employment types broken down into 1% As Needed, 90% Full Time, 6% Part Time, and 3% Contract. Highlights an 87% Physical, 4% Hybrid, and 9% Remote job distribution, with an average salary of $82,997 per year, or $39.9 per hour.

TS/SCI -Entry-Level Software Developer (Python Required)

Bailey Information Technology, LLC

Saint Louis, MO • On-site

$47 - $65/hr

Full-time

Re-posted 3 days ago

Job description

Entry-Level Software Developer (Python Required)
Location: St. Louis, MO
Clearance: HSPD-12 / ability to obtain TS/SCI w/ Poly
Required Certifications: DD8140 compliant Certification (Security+) w/in 3 months
Level: T1 (Target)
Job Description:
The BIT, LLC is recruiting for a junior (entry level) software developer to work on the design and coding with software solutions for the Aeronautical Navigation Office.  The ideal candidate has a familiarity with and a baseline understanding of software development concepts, developing coding skills using different tools, and ambition towards future projects in support of the mission.   
Responsibilities:
The applicant must possess competence with Python and should have working knowledge JavaScript/TypeScript.  Other duties include working with Docker, AWS Cloud, and familiarity with JSON APIs. This role includes creation and documentation of new and existing functionality within software version control repositories (GitLab) and utilizing DevOps principals and tools to deliver new features within an Agile construct. Participate in program Agile software development initiatives (standup, planning, Increment planning) to support innovation and enhancement of custom applications through iteration/functionality testing. Primary responsibilities will involve developing configurations and features for processing Safety of Navigation (SoN) data through an Optical Character Recognition (OCR), Machine Learning (ML) application. This role includes API development and database integration for interaction with React frameworks, using various open-source packages for visualization and data filtering and code modifications that shall apply best practices in unit and build testing. Participate and collaborate with team members to assess tickets to ensure proper testing and delivery of functionality per User Story Acceptance Criteria
Core Qualifications:
  • Minimum 1 year of experience with Python.
  • Experience with modern JavaScript development framework.
  • Experience with unit testing, continuous integration tools, and Gitlab version control
  • Proactive self-starter demonstrates a positive, willing attitude and excellent oral and written communication skills.
  • Experience in either software development projects or software integration projects in a service-oriented environment (Cloud, SOA, Web-Services) or virtualization environment.
  • Requires BS degree and 2+ years of prior relevant experience or Masters with less than 2 years of prior relevant experience; OR 4 years of related experience.
  • Organizational Skills: Can plan and prioritize work. Follow tasks to their logical conclusion and make sure that everything has been done to the right standard. Good attention to detail.
  • Communications: Ability to communicate clearly and efficiently with team members and clients, verbally and in writing. Able to present ideas in a variety of ways depending upon audience and context.

Preferred Qualifications:
  • At least 1 year of experience with Optical Character Recognition (OCR) and/or Computer Vision (CV) Technologies (AWS Textract, Tesseract, OpenCV)
  • At least 1 year of experience with DoD Aeronautical Datasets
  • At least 2 years of experience with AWS cloud formation templates and/or AWS CDK.
  • Experience with 2D data (HTML Canvas, OpenLayers, Leaflet, GeoJSON, Godot)
  • AWS Solutions or DevOps certification
  • Team Collaboration tools (Jira, Confluence)
  • Ability to obtain TS/SCI with Polygraph