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

ECS

Junior Software Developer, Applications

O Fallon, IL · On-site

$62.50K - $81.20K/yr

Everforth ECS Federal is looking for a Junior software developer that develops, creates, and modifies general computer applications software or specialized utility programs. Analyze user needs and ...

ECS

Junior Software Developer, Applications

O Fallon, IL · On-site

$62.50K - $81.20K/yr

ECS Federal is looking for a Junior Software Developer to develop, create, and modify computer applications software. The role involves analyzing user needs, designing software solutions, and ...

Actalent

Devops Engineer

Saint Louis, MO · On-site +1

$69 - $79/hr

Mentor and provide leadership to junior DevOps engineers. Essential Skills * 6+ years of experience in DevOps, SRE, or platform engineering. * Proficiency in AWS, with experience in Azure or GCP as a ...

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$128.3K

How much do junior developer jobs pay per year?

As of May 28, 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.

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 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 job makes $10,000 a month without a degree?

A junior developer can potentially earn $10,000 a month through high-demand skills in software development, especially with experience in areas like web or mobile app creation, and proficiency in programming languages such as JavaScript, Python, or Java. Achieving this income often requires building a strong portfolio, freelance work, or working for companies that pay competitive salaries without requiring a formal degree.

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 popular job titles related to Junior Developer jobs in O'Fallon, IL? For Junior Developer jobs in O'Fallon, IL, the most frequently searched job titles are:
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
Junior Software Developer, Applications

Junior Software Developer, Applications

ECS Limited

O Fallon, IL • On-site

$62.50K - $81.20K/yr

Other

This job post has expired today. Applications are no longer accepted.

Job description

Junior Software Developer

Everforth ECS Federal is looking for a Junior software developer that develops, creates, and modifies general computer applications software or specialized utility programs. Analyze user needs and develop software solutions. Design software or customize software for client use with the aim of optimizing operational efficiency. May analyze and design databases within an application area, working individually or coordinating database development as part of a team. May collaborate directly with customers on requirements gathering and software issues. Assists with software manual creation and maintenance. Work is performed under supervision.

Requirements:

  • CompTIA Security+ Certification (or ability to obtain within 6 months)
  • 0-3 years of development experience
  • Bachelor's degree or work experience substitute
  • Basic Knowledge of Java, HTML5 technologies, Spring, RHEL, SQL, JavaScript, XML, Agile methodologies, WebLogic, Gradle/Maven/Ant, Python.
  • Experience with or ability to learn ticketing system (ServiceNow)
  • Ability to follow documented processes, SOPs and escalation procedures
  • Basic troubleshooting skills and logical problem-solving ability
  • Knowledge of DoD transportation data and business practices
  • Ability to Design, Code and Test requirements using Linux and Windows operating systems,
  • Knowledge of Server technologies like WebLogic, Tomcat and Apache and Container technologies like Docker, Kubernetes
  • Familiar with Version control systems like Git, Build and deployment orchestration tools like Jenkins and Build and package managers like Gradle and Artifactory
  • Experience scripting languages such as Python, BASH, Perl, Powershell
  • Knowledge of Configuration Management tools like Ansible, Puppet, Chef, Terraform
  • Experience writing Java, JavaScript, and SQL or PL/SQL
  • Experience developing Infrastructure as Code (IaC) and Configuration as Code (CaC)
  • Strong understanding of test-driven development and test automation to ensure adequate test coverage (unit, integration, system, load, functional and exploratory)
  • Able to work with the development manager and lead architect on architecture changes and understanding process and application design including grooming requirements in the architecture that were not provided in detail or not fully defined
  • Ability to manage workloads and the creation of program specifications from which the developers work and add them to the work tracker adding flowcharts, class diagrams, Entity Relationship Diagrams (ERDs), and a variety of other visual techniques (mockups) to clearly convey the meaning to the developer.
  • Able to work with development manager to manage backlogs, estimates and other SDLC requirements for development, provide estimates on requirements for iteration/build planning, and Integrate and deploy software in a complex architecture
  • Capable to review code, perform code reviews and code check-ins to ensure the integrity of commits, builds, etc.
  • Ability to learn, understand and refine the capabilities of other developers on the team including ability to mentor and coach intermediate and junior developers with constructive code reviews and code theory discussions

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