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Software Engineer Jobs in O Fallon, IL (NOW HIRING)

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 ...

Omni Federal

Software Engineer

Saint Louis, MO · On-site

Software Engineer Location: St. Louis, MO Security Clearance: Active TS/SCI (or SCI eligibility) We question. We listen. We adapt. Be honest. Be pragmatic. Omni Federal, a Washington, DC-based ...

Boeing

Software Engineer

Hazelwood, MO

$105K - $147K/yr

Software Engineer Company: Tapestry - G0G Tapestry Solutions, A Boeing Company, brings over 30 years of industry experience designing, implementing, training, and supporting high-quality, cost ...

Boeing

Software Engineer

Hazelwood, MO · On-site

$105K - $147K/yr

Software Engineer Company: Tapestry - G0G Tapestry Solutions, A Boeing Company, brings over 30 years of industry experience designing, implementing, training, and supporting high-quality, cost ...

Boeing

Software Engineer

Hazelwood, MO

$105K - $147K/yr

Software Engineer Company: Tapestry - G0G Tapestry Solutions, A Boeing Company, brings over 30 years of industry experience designing, implementing, training, and supporting high-quality, cost ...

GardaWorld

Software Engineer

Saint Louis, MO · On-site

$100K/yr

Software Engineer (Azure Cloud, Data Engineering & Automation) Hybrid - St. Louis, MO We are looking for a mid to senior Software Engineer to design, build, and operate backend services, data ...

GardaWorld

Software Engineer

Saint Louis, MO · On-site +1

$100K/yr

Software Engineer (Azure Cloud, Data Engineering & Automation) | Hybrid - St. Louis, MO We are looking for a mid to senior Software Engineer to design, build, and operate backend services, data ...

Boeing

Experienced Software Engineer

Hazelwood, MO · On-site

Experienced Software Engineer Company: The Boeing Company Boeing Global Services is currently seeking a highly motivated Experienced Software Engineer to become part of the Training Systems ...

Boeing

Experienced Software Engineer

Hazelwood, MO

Experienced Software Engineer Company: The Boeing Company Boeing Global Services is currently seeking a highly motivated Experienced Software Engineer to become part of the Training Systems ...

GardaWorld

Software Engineer

Saint Louis, MO · On-site +1

$100K/yr

Software Engineer (Azure Cloud, Data Engineering & Automation) | Hybrid - St. Louis, MO We are looking for a mid to senior Software Engineer to design, build, and operate backend services, data ...

Boeing

Software Engineer

Hazelwood, MO · On-site

$105K - $147K/yr

The successful candidate for the role of Software Engineer will play a crucial role in the design, development, testing, and maintenance of non-embedded software throughout the end-to-end lifecycle ...

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All JobsSoftware Engineer JobsSoftware Engineer Jobs in O'Fallon, IL

Software Engineer information

See O Fallon, IL salary details

$59.2K

$137.6K

$191.7K

How much do software engineer jobs pay per year?

As of Aug 6, 2026, the average yearly pay for software engineer in O'Fallon, IL is $137,611.00, according to ZipRecruiter salary data. Most workers in this role earn between $111,900.00 and $161,400.00 per year, depending on experience, location, and employer.

Are software engineers still in demand?

Software engineers are currently in high demand due to ongoing digital transformation across industries, with strong growth projected in areas like cloud computing, cybersecurity, and AI. Skills in programming languages such as Python, Java, and experience with agile development increase employability in this field.

What is a software engineer?

Software Engineers are professionals who design, develop, test, and maintain computer software and systems. They use programming languages, engineering principles, and problem-solving skills to build applications, websites, or software solutions that meet specific needs. Software Engineers may work in a variety of industries, such as technology, finance, healthcare, or entertainment, collaborating with other team members to deliver functional and reliable software. Their role often involves analyzing user requirements, writing code, debugging errors, and continually improving software performance.

What are some common challenges software engineers face when collaborating on large development teams?

Software engineers working on large teams often encounter challenges with communication, code integration, and maintaining consistent coding standards. Coordinating across multiple developers can lead to merge conflicts and misunderstandings about project requirements or priorities. Adopting tools like version control systems, regular code reviews, and clear documentation helps mitigate these issues. Building strong collaboration skills and proactively seeking clarification are key to ensuring smooth teamwork and project success.

Are software engineers still in high demand?

Software engineers remain in high demand due to ongoing digital transformation across industries, with skills in programming languages, cloud computing, and cybersecurity highly sought after. The job market is expected to grow faster than average, with opportunities in various sectors including technology, finance, and healthcare.

Is 25 too late to become a software engineer?

Age is not a barrier to becoming a software engineer; many professionals start in their mid-20s or later. Success depends on acquiring relevant skills, such as programming languages and problem-solving, often through coding bootcamps, degrees, or self-study, and gaining practical experience. Employers value skills and experience over age, making it possible to enter the field at 25 or older.

What are the key skills and qualifications needed to thrive as a software engineer, and why are they important?

To thrive as a Software Engineer, you need strong programming skills, problem-solving abilities, and a degree in computer science or a related field. Familiarity with coding languages (such as Python, Java, or C++), version control systems like Git, and knowledge of software development methodologies are typically required. Excellent teamwork, communication, and adaptability distinguish top performers in this role. These skills ensure efficient, high-quality software development that meets user needs and adapts to technological changes.

What is the difference between Software Engineer vs Software Developer?

AspectSoftware EngineerSoftware Developer
CredentialsBachelor's degree in CS or related field, certificationsBachelor's degree often preferred, certifications optional
Work EnvironmentDesigning, developing, testing, and maintaining software systemsWriting, coding, and implementing software applications
Industry UsageUsed across tech, finance, healthcare, and more for system-level rolesCommonly used in app and web development projects
Search IntentUnderstanding roles, responsibilities, and qualificationsLearning about coding, programming, and project work

While both roles involve software creation, Software Engineers typically focus on designing and architecting complex systems, whereas Software Developers mainly concentrate on coding and building specific applications. The roles often overlap, but the Engineer role may require broader system knowledge and design skills.

What do software engineers do for a job?

Software engineers design, develop, test, and maintain software applications and systems. They use programming languages, tools, and frameworks to create solutions that meet user needs and technical requirements, often collaborating with teams and following project deadlines.
More about Software Engineer jobs
What are the most commonly searched types of Software Engineer jobs in O'Fallon, IL? The most popular types of Software Engineer jobs in O'Fallon, IL are:
What cities near O'Fallon, IL are hiring for Software Engineer jobs? Cities near O'Fallon, IL with the most Software Engineer job openings:
Software Engineer jobs near you
Infographic showing various Software Engineer job openings in O'Fallon, IL as of August 2026, with employment types broken down into 90% Full Time, and 10% Part Time. Highlights an 85% In-person, 5% Hybrid, and 10% Remote job distribution, with an average salary of $137,611 per year, or $66.2 per hour.

Software Engineer

Stellar IT Group

Saint Louis, MO • On-site

Full-time

Re-posted 10 days ago

Job description

Overview:
Job Title: 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 candidate will bring deep expertise in React, .NET, and AWS, along with a proven track record of building scalable, high-performance applications. This role requires strong technical leadership, problem-solving abilities, and a passion for delivering innovative solutions.
Responsibilities
  • Design, develop, and maintain complex software applications using React and .NET frameworks.
  • Architect and implement cloud-native solutions leveraging AWS services (EC2, Lambda, S3, RDS, etc.).
  • Collaborate with cross-functional teams including product managers, designers, and QA engineers to deliver high-quality software.
  • Drive best practices in coding standards, architecture, and software development processes.
  • Mentor junior engineers and contribute to team growth through knowledge sharing and technical guidance.
  • Optimize application performance, scalability, and reliability.
  • Participate in code reviews, design discussions, and technical planning sessions.
  • Stay current with emerging technologies and recommend adoption where appropriate.

Qualifications
  • 7+ years of professional software engineering experience.
  • Strong proficiency in React for building modern, responsive web applications.
  • Advanced expertise in .NET (C#, ASP.NET Core) for backend development.
  • Hands-on experience with AWS cloud services and cloud-native application design.
  • Solid understanding of software engineering principles, design patterns, and best practices.
  • Experience with CI/CD pipelines, containerization (Docker, Kubernetes), and DevOps practices is a plus.
  • Excellent problem-solving, analytical, and communication skills.
  • Bachelor's or Master's degree in Computer Science, Engineering, or related field.

Skills:
.net,react,aws

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