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

BAI

Advanced Software Engineer

Saint Louis, MO · On-site +1

$85K - $115K/yr

Advanced Software Engineer Chicago, IL Reports To: Director, Product Development & Operations BAI and RMA have come together as ProSight Financial Association, a leading industry organization whose ...

bioMerieux

Sr. Software Engineer

Hazelwood, MO · On-site

$115K - $152K/yr

The Senior Software Engineer works within established architectural frameworks, enhances CI/CD and infrastructure as code solutions, and develops reliable data pipelines and governance practices. The ...

bioMérieux

Sr. Software Engineer

Hazelwood, MO · On-site

$115K - $152K/yr

The Senior Software Engineer works within established architectural frameworks, enhances CI/CD and infrastructure as code solutions, and develops reliable data pipelines and governance practices. The ...

bioMerieux Inc.

Sr. Software Engineer

Hazelwood, MO · On-site

$113K - $149K/yr

The Senior Software Engineer works within established architectural frameworks, enhances CI/CD and infrastructure as code solutions, and develops reliable data pipelines and governance practices. The ...

ITW Avery Weigh-Tronix

Embedded Software Engineer

MO

$123K - $162K/yr

The Embedded Software Engineer is responsible for the design, development, testing, and support of embedded software solutions for both existing and new products, including new hardware bring-up, low ...

BioFire Diagnostics

Sr. Software Engineer

Hazelwood, MO

$115K - $152K/yr

The Senior Software Engineer works within established architectural frameworks, enhances CI/CD and infrastructure as code solutions, and develops reliable data pipelines and governance practices. The ...

Biomerieux

Sr. Software Engineer

Hazelwood, MO · On-site

$113K - $149K/yr

The Senior Software Engineer works within established architectural frameworks, enhances CI/CD and infrastructure as code solutions, and develops reliable data pipelines and governance practices. The ...

Know Ink, LLC

Software Engineer III

Saint Louis, MO · On-site

Net developer to build software using languages and technologies of the .NET framework. You will need to be able to create applications from scratch, modify existing application code for fixes or ...

Merck Group

Staff Software Engineer

Saint Louis, MO · On-site

$110K - $165K/yr

This role is software engineering first, with a strong emphasis on designing reliable systems that ingest, process, and serve data to power modern applications and AI-driven solutions. You will work ...

The Timberline Group

Senior Software Engineer

Saint Louis, MO · On-site +1

$119K - $157K/yr

We are looking for a Senior Software Engineer to produce and implement functional software solutions. You will work with upper management to define software requirements and take the lead on ...

Husch Blackwell LLP

Senior Software Engineer

Saint Louis, MO · On-site +1

$114K - $151K/yr

The Senior Software Engineer designs, builds, and maintains the technical systems and application infrastructure that power high-quality, human-centered information experiences. This role is ...

Boeing

Experienced Software Engineer

Hazelwood, MO · On-site

Experienced Software Engineer Company: The Boeing Company The Boeing Company is looking for an Experienced Software Engineer to join theDigital Analytics and System Health (DASH) team supporting the ...

Boeing

Associate Software Engineer

Hazelwood, MO

$82K - $105K/yr

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

Boeing

Associate Software Engineer

Hazelwood, MO

$82K - $105K/yr

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

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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 11, 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.

Advanced Software Engineer

BAI

Saint Louis, MO • On-site, Remote

$85K - $115K/yr

Full-time

Retirement, PTO

Re-posted yesterday

Job description

Advanced Software Engineer
Chicago, IL
Reports To: Director, Product Development & Operations
BAI and RMA have come together as ProSight Financial Association, a leading industry organization whose purpose is to empower financial services leaders to strengthen and advance our industry. The strategic combination brings together RMA's expertise in serving the commercial banking and risk management functions and BAI's knowledge in serving the retail banking and regulatory compliance functions. It's a complementary union of two non-profit organizations that have always had their members' and customers' best interests in mind. Our industry-leading offerings include peer sharing events, thought leadership, learning and development, and decision support solutions. Our work creates positive ripple effects throughout financial services organizations and ultimately helps consumers, businesses and communities thrive.
We are seeking an experienced and results-driven Advanced Software Engineer with strong .NET/C# and SQL skills and hands-on experience developing Microsoft Azure cloud solutions. In this role, you'll be instrumental in designing, developing, deploying, and maintaining secure, reliable, and scalable software solutions that deliver market-leading value to our customers.
What You'll Do:
  • Design, implement, and maintain secure, scalable, and reliable software systems.
  • Collaborate with product managers, architects, designers, and engineers to translate business requirements into secure, scalable, reliable, and effective customer-focused software solutions.
  • Deploy, manage, and monitor applications on Microsoft Azure, following best practices for cloud architecture.
  • Write and maintain clean, efficient, and testable code using modern engineering best practices such as CI/CD and automated testing.
  • Participate in code reviews, technical guidance, and knowledge sharing.
  • Participate in efforts to remediate and resolve security, performance, reliability, and scalability issues, including root cause analysis and preventive measures.
  • Contribute to architectural planning and technology roadmaps.
  • Stay current with the latest security threats and secure engineering practices to ensure that all application components remain protected
What We're Looking For:
  • 3-5+ years of professional experience in software engineering.
  • Strong experience with Microsoft Azure, including services like Azure Functions, Azure App Services, and Azure DevOps.
  • Proficiency in C# and other .NET-based languages, with experience maintaining both legacy and modern applications.
  • Solid understanding of front-end technologies including HTML, CSS, JavaScript, and React.JS, and legacy Angular JS.
  • Familiarity with containerization technologies such as Docker and orchestration tools like Kubernetes.
  • Solid understanding of RESTful APIs and asynchronous programming patterns.
  • Strong experience with SQL databases (e.g., Microsoft SQL Server, MySQL, PostgreSQL), including schema design and query optimization.
  • Self-starter, comfortable with ambiguity, ability to initiate and reliably drive projects forward with minimal oversight
  • Excellent problem-solving skills and the ability to work effectively within cross-functional teams.
  • Ability to communicate effectively with both technical and non-technical stakeholders
  • Ability to work in the Chicago office periodically is required
Preferred Qualifications:
  • Familiarity with Infrastructure-as-Code tools (e.g., Terraform, ARM templates).
  • Familiarity with microservice development, design patterns, separation of concerns, and maintainable architecture
  • Background in DevOps practices and CI/CD pipeline implementation.
  • Experience in Agile/Scrum development environments.
  • Experience with e-learning/online learning, policy management, and/or governance risk and compliance a plus
  • Familiarity with financial services/banking industry a plus
The salary range for this position is $85,000 - $115,000. Compensation offered will be determined by factors such as skills, experience, education, job-related knowledge and market considerations. ProSight offers an outstanding benefits package with comprehensive insurance coverage, a 401(k) plan with company match, flexible paid time off, hybrid and remote working models, tuition assistance and the ability to work in a collaborative, team-oriented environment.
To learn more about our company please visitwww.prosightfa.org,www.bai.org, andwww.rmahq.org
Employment Type: Full-Time

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