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Entry Level Software Engineer Jobs in O Fallon, MO

Maritz

Software Engineer I

Fenton, MO · On-site

The Software Engineer I supports the development of software that serves Maritz technology, working ... What You'll Be Doing We are looking for an entry level engineer who is eager to learn and build ...

MasterCard

Software Engineer II

O Fallon, MO

$92K - $147K/yr

A Software Engineer II is an earlycareer or entrylevel engineer who contributes to the design, development, testing, and maintenance of software solutions under the guidance of more senior engineers.

MasterCard

Software Engineer II

O Fallon, MO · On-site

$91K - $124K/yr

A Software Engineer II is an earlycareer or entrylevel engineer who contributes to the design, development, testing, and maintenance of software solutions under the guidance of more senior engineers.

Mastercard, Inc.

Software Engineer II

O Fallon, MO · On-site

$92K - $147K/yr

A Software Engineer II is an early-career or entry-level engineer who contributes to the design, development, testing, and maintenance of software solutions under the guidance of more senior ...

Stellar IT Solutions

AWS Data Engineer

Saint Louis, MO · On-site

$108K - $130K/yr

This is an excellent opportunity for entry level candidates and early-career professionals who want ... Engineering, Cloud, or Software Development. * Strong knowledge of SQL and Python. * Basic ...

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All JobsSoftware Engineer JobsEntry Level Software Engineer JobsEntry Level Software Engineer Jobs in O'Fallon, MO

Entry Level Software Engineer information

See O Fallon, MO salary details

$22.4K

$98.1K

$176.7K

How much do entry level software engineer jobs pay per year?

As of Jul 19, 2026, the average yearly pay for entry level software engineer in O'Fallon, MO is $98,054.00, according to ZipRecruiter salary data. Most workers in this role earn between $60,800.00 and $112,200.00 per year, depending on experience, location, and employer.

Will AI replace developers in 2026?

Entry level software engineers will continue to play a vital role in software development, as AI tools are designed to assist rather than fully replace human programmers. Developing skills in coding, problem-solving, and understanding AI integration will remain valuable in the evolving tech environment.

What is the difference between Entry Level Software Engineer vs Software Developer?

AspectEntry Level Software EngineerSoftware Developer
Required CredentialsBachelor's in CS or related field; some internshipsBachelor's in CS or related; coding experience
Work EnvironmentTeam-based, collaborative projects, entry-level tasksProject-focused, coding, debugging, and implementation
Employer & Industry UsageTech companies, startups, IT departmentsSoftware firms, tech startups, enterprise IT
Common Search & ComparisonYesYes

Entry Level Software Engineers and Software Developers often share similar educational backgrounds and work environments. The main difference lies in their roles: engineers may focus more on designing systems and architecture, while developers typically concentrate on coding and implementation. Both roles are essential in tech industries and often overlap in job functions, but understanding these distinctions helps job seekers target the right positions.

What engineer makes $500,000 a year?

Highly experienced software engineers, especially those in senior or specialized roles such as machine learning engineers or software architects at large tech companies, can earn $500,000 or more annually. These roles often require advanced skills, extensive experience, and sometimes stock options or bonuses as part of compensation packages.

How to get a job as a software engineer with no experience?

Entry-level software engineer positions often require demonstrating programming skills through personal projects, internships, or coding bootcamps. Building a strong portfolio, learning relevant tools like Git and languages such as Python or Java, and obtaining certifications can improve chances of securing an entry-level role without prior work experience.

What types of projects do entry level software engineers typically work on, and how do they collaborate with other team members?

Entry level software engineers often start by working on smaller features, bug fixes, or assisting with testing and documentation within larger projects. They usually collaborate closely with senior engineers, product managers, and QA teams through code reviews, daily stand-ups, and pair programming sessions. This structure helps new engineers learn best practices, understand the codebase, and gradually take on more complex assignments. Effective communication and a willingness to learn are key to success in these collaborative environments.

What does an entry level software engineer do?

An entry level software engineer is responsible for assisting in the design, development, testing, and maintenance of software applications. They typically work under the guidance of more experienced engineers and may write code, debug programs, and participate in code reviews. The role often involves learning company-specific tools and workflows, collaborating with team members, and continuously improving technical skills. Entry level software engineers are expected to adapt quickly, communicate effectively, and contribute to the team's overall goals.

What are the key skills and qualifications needed to thrive as an Entry Level Software Engineer, and why are they important?

To thrive as an Entry Level Software Engineer, you need a solid understanding of programming languages (such as Java, Python, or C++), computer science fundamentals, and often a relevant bachelor’s degree. Familiarity with version control systems like Git, development frameworks, and basic software development tools is typically expected. Strong problem-solving abilities, eagerness to learn, and effective collaboration are standout soft skills in this role. These skills are crucial for building reliable software, adapting to evolving technologies, and contributing productively to team projects.

What Does an Entry Level Software Engineer Do?

An Entry-Level Software Engineer, also called a Junior Engineer, works with a team of mid-level and senior engineers to develop, test, and maintain software applications and programs. The job duties of Junior Software Engineers typically include relatively simple routine tasks, such as debugging, testing, and code documentation. These tasks hone a Junior Engineer’s skills and familiarize them with the company’s code base. As Software Engineers gain more years of experience, they work on more complex development projects.

Is it true that AI will replace software engineers?

AI is unlikely to fully replace entry-level software engineers, as human skills such as problem-solving, creativity, and understanding complex requirements remain essential. AI tools can assist with coding and automation, but software engineering involves tasks that require critical thinking and collaboration. Developing proficiency in programming languages and understanding AI capabilities can enhance job performance and adaptability in the field.
More about Entry Level Software Engineer jobs
What are the most commonly searched types of Software Engineer jobs in O'Fallon, MO? The most popular types of Software Engineer jobs in O'Fallon, MO are:
What are popular job titles related to Entry Level Software Engineer jobs in O'Fallon, MO? For Entry Level Software Engineer jobs in O'Fallon, MO, the most frequently searched job titles are:
What cities near O'Fallon, MO are hiring for Entry Level Software Engineer jobs? Cities near O'Fallon, MO with the most Entry Level Software Engineer job openings:
Entry Level Software Engineer jobs near you
Infographic showing various Entry Level Software Engineer job openings in O'Fallon, MO as of July 2026, with employment types broken down into 95% Full Time, and 5% Part Time. Highlights an 78% In-person, 11% Hybrid, and 11% Remote job distribution, with an average salary of $98,054 per year, or $47.1 per hour.
Software Engineer I

Software Engineer I

Maritz

Fenton, MO • On-site

Full-time

Medical, Dental, Vision, Life, Retirement, PTO

Posted 9 days ago

Job description

Where Human Connection Fuels Possibility
At Maritz, decades of innovation and perseverance have built more than just a strong reputation - they've shaped a culture where human connection and collaboration are at the heart of everything we do.
Joining Maritz means becoming part of a workplace grounded in a critical truth; people and their potential is our greatest resource.
Maritz helps companies achieve their business goals by inspiring people to perform their best. We design experiences, incentives, and recognition programs that spark action and deliver measurable impact.
And we've brought this human-first design inward - intentionally building teams that care for each other and collaborate powerfully. In our most recent employee survey, nearly 90% of respondents said that their managers care about their concerns and 82% said they feel genuinely appreciated. We know that when employees feel seen, supported, and celebrated for who they are, they thrive and so does our business.
That's why we've created a flexible, environment that empowers you to do your best work without sacrificing what matters most to you. In fact, in that same survey, nearly 90% of respondents said they have the flexibility they need to balance work and personal life and nearly 80% said Maritz does a great job prioritizing employee well being.
We have a passion for excellence and genuine care for the people making it possible.
We are building a cloud-native, AI-forward technology organization. The Software Engineer I supports the development of software that serves Maritz technology, working closely with and under the guidance of fellow engineers on the team. In this role, you will help build and maintain application features and services, with growing exposure to AI-assisted engineering practices.
What You'll Be Doing
We are looking for an entry level engineer who is eager to learn and build strong technical foundations. You will work alongside senior engineers across codebases, cloud platforms, and engineering toolchains, contributing to project execution under guidance. The ideal candidate brings foundational knowledge in systems or software engineering and curiosity toward emerging technologies, including AI-driven tooling.
80% - Software Engineering Project Support
  • Performs routine to moderately complex development work across a variety of environments, with support from senior engineers on more complex or nonroutine tasks.

  • Uses AI-assisted coding tools (e.g., GitHub Copilot, Claude) to accelerate development and improve code quality and throughput.

  • Participates in code reviews of peers' work - including AI-generated code - to help ensure quality, security, and adherence to standards.

  • Actively participates in and helps facilitate Agile ceremonies (sprint planning, stand-ups, retrospectives).

  • Seeks guidance from senior engineers on effective, responsible adoption of AI-assisted development tools.

  • Supports efforts to apply AI and automation to improve deployment frequency and increase system reliability.

20% - Problem Solving & Operational Reliability
  • Assists with resolving service interruptions and contributes to root cause analysis during post-mortems under the guidance of senior engineers.

  • Helps identify trends, anomalies, and failure patterns; recommends solutions with input from senior team members.

  • Actively participates in a culture of continuous improvement, learning, and operational excellence within the team.

  • Supports cross-functional teams during major incidents, helping ensure clear communication and timely updates throughout the lifecycle of an event.

What You'll Bring
  • Bachelor's degree in a technology-related field, or equivalent practical experience demonstrating the required skills. 1-2 years of relevant experience; internships, co-ops, and academic or personal projects will be considered. Cloud platform, or AI-related certifications are a plus.
  • Foundational knowledge of web application frameworks, object-oriented languages, functional programming techniques, design patterns, and secure coding practices, gained through coursework, internships, or professional experience.

  • Exposure to building web applications or web-services, preferably REST

  • Basic familiarity with relational and/or NoSQL databases and core concepts such as ACID transactions, data retrieval, search, and persistence paradigms.

  • Developing triage skills, with the ability to assist in root cause analysis under guidance.

  • Basic exposure to at least one major cloud platform (AWS, GCP, or OCI).

  • Growing ability to interpret and apply security requirements across infrastructure and software systems.

  • Experience using AI-assisted development tools (e.g., GitHub Copilot, Claude) to generate, review, and improve code.

  • Growing ability to evaluate AI-generated code and configurations for correctness, security, and performance, with support from senior engineers.

  • Understanding of responsible AI use principles in an enterprise engineering context.

  • Proficient written and verbal communication skills, with the ability to engage both technical and non-technical audiences.

Things You Should Know
  • This is a hybrid role based in Fenton, MO (Tuesday | Wednesday | Thursday).

DISCLAIMER: This job description is designed to indicate the general nature and level of work performed by associates within this classification. It is not designed to confirm or be interpreted as a comprehensive summary of all duties, responsibilities and qualifications required of associates assigned to this job.
Maritz offers a comprehensive benefits package for full-time employees including medical, dental, vision, life insurance, disability, paid parental leave, 401k, tuition reimbursement, paid time off, year end holiday closure, and more!
View all details at: www.MaritzBenefits.com
Maritz will only employ applicants who have authorization to work permanently in the U.S. This is not a position for which sponsorship will be provided. Those who need sponsorship for work authorization now or in the future are not eligible for hire. No calls or agencies please.
Maritz is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to sex, race, color, religion, national origin, age, marital status, political affiliation, sexual orientation, gender identity, genetic information, disability or protected veteran status. We are committed to providing a workplace free of any discrimination or harassment.
If you have a disability and are having difficulty accessing or using this website to apply for a position, you can request help by calling 1-636-827-0380 or by sending an email to recruitment@maritz.com.

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