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

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 ...

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 ...

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 ...

RIVIDIUM

Software Developer - Advanced

Saint Louis, MO · On-site

$150K - $160K/yr

RiVidium Inc. is seeking a Full Stack Software Developer to develop, create, maintain, and write/code new (or modifies existing) computer applications, software, or specialized utility programs.

DCS Corp

Senior Level Software Developer

Saint Louis, MO

$53 - $70/hr

We are seeking a Software Engineer to support unique systems solutions for the National Geospatial-Intelligence Agency (NGA). We are seeking a Software Engineer to support our client's intelligence ...

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Junior Software Developer information

See O Fallon, IL salary details

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$83K

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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:

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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.

Software Developer

Meridian Systematics

Saint Louis, MO • On-site

$90K - $110K/yr

Full-time

Posted 22 days ago

Job description


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 applications supporting critical enterprise and GEOINT missions. Operating within a SAFe/Scrum environment, you will drive full-lifecycle development—from requirements analysis through deployment and sustainment—to deliver resilient solutions across modern DevSecOps pipelines.

Key Responsibilities

  • Full-Lifecycle Engineering: Research, design, code, test, deploy, and maintain custom applications supporting mission-critical workflows and enterprise data integration.
  • Agile Execution: Actively participate in SAFe/Scrum ceremonies (sprint planning, estimation, retrospectives) using Jira and Confluence to track progress and identify technical risks.
  • DevSecOps & Delivery: Build, test, and deploy applications using continuous integration/continuous deployment (CI/CD) pipelines across data-center and on-premises environments.
  • Quality & Security: Write clean, testable code, develop automated unit/integration test suites, maintain robust application monitoring, and strictly adhere to security standards.
  • Data & Systems Integration: Connect software solutions with enterprise databases, geospatial engines, and agency-specific workflows while maintaining thorough technical documentation.
Required Qualifications

  • Clearance: Active TS/SCI security clearance with eligibility for a CI Polygraph.
  • Citizenship: US Citizenship Required
  • Experience & Education: Bachelor’s degree in Computer Science, Engineering, Mathematics (or equivalent experience/training) plus 5+ years of progressive software development experience.
  • Core Languages: Advanced proficiency in at least one modern language (Python, Java, JavaScript, React, or .NET).
  • Containerization & CI/CD: Hands-on experience with Docker, Kubernetes, and pipeline automation tools (GitLab, Jenkins, Nexus).
  • Data & Infrastructure: Proven experience with SQL/enterprise data stores and deploying software within on-premises data-center environments.
Preferred Qualifications

  • Hands-on experience with Red Hat OpenShift, Helm, or Terraform (Infrastructure as Code).
  • Familiarity with AWS/cloud infrastructure and PostgreSQL databases.
  • Direct experience with geospatial technologies (ArcGIS, MAPINFO) or NGA/GEOINT intelligence community workflows.
  • Proficiency with search platforms like Elasticsearch and UI/UX design (HTML/CSS/Sass/Less).