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

Interco

Junior Software Developer

Saint Louis, MO · On-site

$60K - $65K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Interco is seeking a talented Junior Software Developer with a strong background in JavaScript and React.js to contribute to an innovative Enterprise Resource Planning (ERP) project. In this role ...

Interco Trading

Junior Software Developer

Saint Louis, MO

$60K - $65K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Interco is seeking a talented Junior Software Developer with a strong background in JavaScript and React.js to contribute to an innovative Enterprise Resource Planning (ERP) project. In this role ...

Interco Trading

Junior Software Developer

Saint Louis, MO · On-site

$60K - $65K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Interco is seeking a talented Junior Software Developer with a strong background in JavaScript and React.js to contribute to an innovative Enterprise Resource Planning (ERP) project. In this role ...

Interco

Junior Software Developer

Saint Louis, MO

$60K - $65K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Interco is seeking a talented Junior Software Developer with a strong background in JavaScript and React.js to contribute to an innovative Enterprise Resource Planning (ERP) project. In this role ...

Sovereign Technologies

Junior C# Developer

Saint Louis, MO · On-site

$65K - $84K/yr

Company Description The individual in the Programmer Analyst role is responsible for using technical skills and programming experience to define and program solutions to problems and requests of ...

Stereotaxis

Junior Buyer

Saint Louis, MO · On-site

$21.75 - $28/hr

Working under the direction of the Senior Buyer Manager, the Junior Buyer collaborates with Engineering, Production, Quality, Receiving Inspection, and Field Service to support production schedules ...

Wiser

Cartographer (Junior) - TS/SCI

Saint Louis, MO · On-site

$70K - $80K/yr

Junior Cartographer - TS/SCI Location: St. Louis, MO TS/SCI Security Clearance Wiser offers innovative solutions to clients in the public, private, and government sectors. We combine technology and ...

Stereotaxis

Junior Buyer

Saint Louis, MO

$21.75 - $28/hr

The Junior Buyer supports the procurement of materials, components, equipment, and services ... Support Engineering by obtaining supplier information, documentation, and quotations for new and ...

E*Pro, Inc.

Jr. Validation Engineer

Saint Louis, MO

Position: Jr. Validation Engineer Location : St. Louis, MO Contract type: Contract Description : Temporary, entry-level position to mitigate expected validation workload Review requirements documents ...

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Showing results 1-20

All JobsDeveloper JobsJunior Developer JobsJunior Developer Jobs in O'Fallon, IL

Junior Developer information

See O Fallon, IL salary details

$22.4K

$83K

$128.3K

How much do junior developer jobs pay per year?

As of Aug 16, 2026, the average yearly pay for junior 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 are the key skills and qualifications needed to thrive as a junior developer, and why are they important?

To thrive as a Junior Developer, you need a solid understanding of programming fundamentals, basic knowledge of software development life cycles, and ideally a degree in computer science or a related field. Familiarity with coding languages like JavaScript, Python, or Java, as well as version control systems such as Git, is commonly expected. Strong problem-solving abilities, eagerness to learn, and effective communication help you integrate into teams and adapt to new challenges. These skills are crucial for producing quality code, collaborating with colleagues, and growing within the fast-paced tech environment.

How much does a junior developer earn?

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 Java, Python, or JavaScript, and familiarity with development tools and frameworks.

What is a junior developer?

A Junior Developer is an entry-level software professional who assists in creating, testing, and maintaining software applications. They typically work under the supervision of more experienced developers, learning best practices and acquiring new technical skills on the job. Junior Developers are expected to write code, fix bugs, and contribute to project documentation while gradually gaining experience in software development processes. This role is ideal for recent graduates or individuals transitioning into the tech industry.

What is the difference between Junior Developer vs Software Engineer?

AspectJunior DeveloperSoftware Engineer
Required CredentialsTypically an associate degree or bootcamp certificationBachelor's degree in Computer Science or related field
Work EnvironmentEntry-level, supervised tasks, learning-focusedMore complex projects, often with team leadership responsibilities
Employer UsageCommon in startups, small companies, internshipsUsed across industries, larger companies, and tech firms
Search & Comparison IntentUnderstanding entry-level roles, career startClarifying career progression, skill requirements

In summary, Junior Developers are entry-level roles focused on learning and supporting development tasks, often requiring minimal experience. Software Engineers typically have more experience, advanced skills, and handle complex projects, making them a step up in the software development career path.

What are some common challenges faced by junior developers during their first year, and how can they overcome them?

Junior Developers often face challenges such as adapting to new codebases, understanding company workflows, and bridging the gap between academic knowledge and real-world applications. It’s common to feel overwhelmed by unfamiliar technologies or debugging complex issues. Overcoming these challenges involves proactively seeking mentorship, participating in code reviews, and consistently asking questions to clarify concepts. Building strong communication skills and collaborating with more experienced team members can also accelerate the learning process and help you grow more confident in your role.

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 to develop their technical skills.

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

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

Junior Developer jobs near you
Infographic showing various Junior Developer job openings in O'Fallon, IL as of August 2026, with employment types broken down into 78% Full Time, 7% Part Time, 14% Contract, and 1% Nights. Highlights an 81% Physical, 4% Hybrid, and 15% Remote job distribution, with an average salary of $82,997 per year, or $39.9 per hour.

Job Title: Junior DevOps Engineer

The Giant Bullseye

Saint Louis, MO • Remote

$50K/yr

Full-time

Re-posted 3 days ago

Job description

Job Title: Junior DevOps Engineer (0–2 Years)

Location: Remote (United States)
Employment Type: Full-Time (W2) or Independent Contractor (1099)
Experience: 0–2 Years
Salary: $50,000 per year
Benefits: None
Visa Sponsorship: Not Available

Job Summary

We are hiring a Junior DevOps Engineer to support CI/CD pipelines, cloud infrastructure, and automation initiatives. This role is ideal for candidates interested in cloud computing and DevOps practices.

Responsibilities
  • Assist with CI/CD pipeline maintenance.
  • Support cloud infrastructure on AWS, Azure, or GCP.
  • Monitor applications and system performance.
  • Automate deployment and operational tasks.
  • Manage source code using Git.
  • Troubleshoot deployment and infrastructure issues.
  • Document DevOps processes and procedures.
Required Qualifications
  • Bachelor's degree in Computer Science, Information Technology, or related field.
  • 0–2 years of DevOps or Cloud experience.
  • Basic knowledge of Linux and networking.
  • Familiarity with Git, Docker, and CI/CD tools (GitHub Actions, Jenkins, or Azure DevOps).
  • Exposure to AWS, Azure, or Google Cloud.
  • Basic scripting knowledge (Bash or Python) is preferred.