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

Chenega Corporation

ServiceNow Developer

Saint Louis, MO · On-site

$52.50 - $72/hr

The Senior ServiceNow Developer will mentor junior developers, collaborate across engineering teams, and serve as the senior escalation point for complex technical challenges. Responsibilities * Lead ...

Chenega Corporation

ServiceNow Developer

Saint Louis, MO

$52.50 - $72/hr

The Senior ServiceNow Developer will mentor junior developers, collaborate across engineering teams, and serve as the senior escalation point for complex technical challenges. Responsibilities * Lead ...

Synectics Inc

Law Clerk / Junior Associate

Edwardsville, IL

$65K - $80K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

Our client is seeking an Law Clerk / Junior Associate Qualifications: * Juris Doctor (J.D.) from an ... We specialize in IT, engineering, finance, healthcare, and professional services recruitment ...

Automationtechies

Control Engineer

Saint Louis, MO · On-site

$81K - $105K/yr

  • Medical

  • Dental

  • Vision

  • Retirement

You should be comfortable leading or supporting technical teams, mentoring junior engineers, and traveling to customer sites for startup and troubleshooting activities. Reasons you will be excited to ...

Automationtechies

Control Engineer

Saint Louis, MO

$81K - $105K/yr

  • Medical

  • Dental

  • Vision

  • Retirement

You should be comfortable leading or supporting technical teams, mentoring junior engineers, and traveling to customer sites for startup and troubleshooting activities. Reasons you will be excited to ...

WSP

Junior Substation Designer

Saint Louis, MO · On-site

WSP is currently initiating a search for a Junior Substation Designer for our Minneapolis, MN ... Under minimal supervision, work closely with engineers to resolve design details or discrepancies ...

WSP

Junior Substation Designer

Saint Louis, MO · On-site

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

WSP is currently initiating a search for a Junior Substation Designer for our Minneapolis, MN ... Under minimal supervision, work closely with engineers to resolve design details or discrepancies ...

WSP

Junior Substation Designer

Saint Louis, MO

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

WSP is currently initiating a search for a Junior Substation Designer for our Minneapolis, MN ... Under minimal supervision, work closely with engineers to resolve design details or discrepancies ...

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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 17, 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.

Senior LO Propulsion Integration Engineer

The Boeing Company

Berkeley, MO • On-site

$112.20 - $151.80/hr

Other

Posted 5 days ago

Boeing rating

8.5

Company rating: 8.5 out of 10

Based on 612 frontline employees who took The Breakroom Quiz

33rd of 540 rated manufacturers

Job description

The Boeing Company is looking for a Low Observable Propulsion Integration Engineer in Berkeley, Missouri. This position involves leading propulsion systems integration for advanced stealth aircraft programs. Candidates should have a Bachelor's degree in Engineering, particularly in Electrical, Mechanical, or Aeronautical fields, and at least 5 years of experience. Responsibilities include conducting trade studies, developing LO architectures, and mentoring junior engineers. The role offers a chance to work in a collaborative and innovative environment with significant opportunities for career growth. #J-18808-Ljbffr

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