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Software Engineer Internship Jobs in O Fallon, MO

Maritz

Software Engineer II

Fenton, MO · On-site

$92K - $127K/yr

The Software Engineer II supports the development of software that serves Maritz technology ... internships, or professional experience. Nice to Have * Experience with IaC tooling, including the ...

Stellar IT Group

Software Engineer

Saint Louis, MO · On-site

Software Engineer IV Job Location: Remote Job Type: 6-12+ Months Job Details: We are seeking a highly skilled and experienced Software Engineer IV to join our dynamic engineering team. The ideal ...

BAI

Software Engineer

Saint Louis, MO · On-site +1

$75K - $95K/yr

Software Engineer Reports To: Manager, Software Engineering BAI and RMA have come together as ProSight Financial Association, a leading industry organization whose purpose is to empower financial ...

MiTek, Inc.

Software Engineer

Chesterfield, MO · On-site

$85K - $140K/yr

Job Responsibilities & Requirements As a Software Engineer in MiTek's Homebuilder division, you will help design, develop, modernize, and support MiTek Kova, a web-based ERP platform used by ...

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All JobsSoftware Engineer JobsSoftware Engineer Internship JobsSoftware Engineer Internship Jobs in O'Fallon, MO

Software Engineer Internship information

See O Fallon, MO salary details

$12

$23

$36

How much do software engineer internship jobs pay per hour?

As of Aug 18, 2026, the average hourly pay for software engineer internship in O'Fallon, MO is $23.78, according to ZipRecruiter salary data. Most workers in this role earn between $19.33 and $26.97 per hour, depending on experience, location, and employer.

What is a software engineer internship?

A Software Engineer Internship is a temporary position where students or entry-level professionals gain hands-on experience in software development. Interns typically work on real projects, write code, debug issues, and collaborate with engineering teams. The internship helps develop technical skills, knowledge of software development processes, and familiarity with industry tools. It also provides networking opportunities and can lead to full-time job offers.

What kinds of projects or tasks do software engineer interns typically work on during their internship?

Software Engineer Interns are often assigned to real-world projects that may include developing new features, fixing bugs, writing automated tests, or improving documentation. They usually work as part of a development team under the mentorship of experienced engineers, which allows them to participate in code reviews, agile meetings, and collaborative problem-solving sessions. The exact responsibilities may vary, but interns are regularly exposed to the full software development lifecycle and are encouraged to ask questions and contribute ideas. This hands-on experience not only builds technical skills but also prepares interns for full-time roles after graduation.

What are the key skills and qualifications needed to thrive in the software engineer internship position, and why are they important?

To thrive as a Software Engineer Intern, you need a solid understanding of programming languages (such as Java, Python, or C++), algorithms, data structures, and typically be pursuing or have a degree in computer science or a related field. Familiarity with version control systems like Git, integrated development environments (IDEs), and sometimes issue tracking tools is often expected. Strong problem-solving abilities, a willingness to learn, and effective communication are key soft skills that help interns excel in collaborative environments. These skills ensure interns can contribute meaningfully to technical projects, integrate well with engineering teams, and grow rapidly within the organization.

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 cities near O'Fallon, MO are hiring for Software Engineer Internship jobs?

Cities near O'Fallon, MO with the most Software Engineer Internship job openings:

Software Engineer Internship jobs near you
Infographic showing various Software Engineer Internship job openings in O'Fallon, MO as of August 2026, with employment types broken down into 1% As Needed, 83% Full Time, 12% Part Time, and 4% Contract. Highlights an 87% Physical, 4% Hybrid, and 9% Remote job distribution, with an average salary of $49,456 per year, or $23.8 per hour.

Software Engineer II

Maritz

Fenton, MO • On-site

$92K - $127K/yr

Full-time

Medical, Dental, Vision, Life, Retirement, PTO

Re-posted 7 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 II 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.
The ideal candidate brings foundational knowledge in systems or software engineering and curiosity toward emerging technologies, including AI-driven tooling. Experience with IaC tooling, including the ability to understand write, and structure Terraform is highly preferred
What You'll Be Doing
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
  • At least 3 years of experience within a software engineering related position.
  • Proficient written and verbal communication skills, with the ability to engage both technical and non-technical audiences.
  • Understanding of responsible AI use principles in an enterprise engineering context.
  • Growing ability to evaluate AI-generated code and configurations for correctness, security, and performance, with support from senior engineers.
  • Experience using AI-assisted development tools (e.g., GitHub Copilot, Claude) to generate, review, and improve code.
  • Growing ability to interpret and apply security requirements across infrastructure and software systems.
  • Basic exposure to at least one major cloud platform (AWS, GCP, or OCI).
  • Developing triage skills, with the ability to assist in root cause analysis under guidance.
  • Basic familiarity with relational and/or NoSQL databases and core concepts such as ACID transactions, data retrieval, search, and persistence paradigms.
  • Exposure to building web applications or web-services, preferably REST
  • 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.

Nice to Have
  • Experience with IaC tooling, including the ability to understand write, and structure Terraform is highly preferred.

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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