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Senior Software Developer Jobs in O Fallon, IL (NOW HIRING)

Eastman

Senior Software Engineer

Saint Louis, MO · On-site

$114K - $151K/yr

Position Description We are seeking a Senior Software Engineer who is passionate about building ... developer experience and the customer experience. • Design, develop, test, and deploy end-to-end ...

Eastman

Senior Software Engineer

Saint Louis, MO · On-site

$119K - $157K/yr

Position Description We are seeking a Senior Software Engineer who is passionate about building ... developer experience and the customer experience. • Design, develop, test, and deploy end-to-end ...

LRS

Senior Software Engineer

Saint Louis, MO

$60 - $70/hr

LRS Consulting Services is seeking a Senior Software Engineer who enjoys solving complex technical ... Experience with Azure DevOps, including source control, build and release pipelines, automated ...

Stereotaxis

Senior Software Engineer

Saint Louis, MO · On-site

$119K - $157K/yr

The Senior Software Engineer is responsible for system architecture and providing key technical guidance in the full life cycle development and support of C++ code and related technologies in the ...

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Senior Software Developer information

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How much do senior software developer jobs pay per hour?

As of Sep 2, 2026, the average hourly pay for senior software developer in O'Fallon, IL is $57.58, according to ZipRecruiter salary data. Most workers in this role earn between $48.89 and $64.57 per hour, depending on experience, location, and employer.

What is a senior software developer?

Senior Software Developers are experienced professionals who design, develop, and maintain complex software applications. They often lead development teams, mentor junior developers, and make critical architectural decisions. Their responsibilities include writing high-quality code, troubleshooting technical issues, and ensuring that software projects meet performance and security standards. With deep expertise in programming languages and software engineering principles, they play a key role in delivering successful technology solutions for organizations.

What does a senior software developer do?

As a Senior Software Developer, you’ll typically be responsible for leading complex development projects, designing technical solutions, and mentoring junior team members. Daily tasks often include writing and reviewing code, participating in architecture discussions, collaborating with cross-functional teams (such as QA, product management, and DevOps), and troubleshooting high-level technical issues. You may also be involved in setting coding standards, conducting code reviews, and helping to plan sprints or project roadmaps.

What skills and qualifications are needed to thrive as a senior software developer?

To thrive as a Senior Software Developer, you need deep expertise in programming languages, software architecture, and problem-solving, typically backed by a bachelor’s degree in computer science or a related field. Proficiency with development frameworks, version control systems like Git, and cloud platforms such as AWS or Azure is standard, and certifications in these areas can be beneficial. Leadership, strong communication, and mentoring abilities set standout candidates apart in this role. These skills ensure that complex projects are delivered efficiently, code quality is maintained, and junior team members are effectively guided for overall team success.

What is the difference between Senior Software Developer vs Software Engineer?

AspectSenior Software DeveloperSoftware Engineer
CredentialsBachelor's degree in CS or related field; experience often 5+ yearsBachelor's or higher in CS or related field; similar experience levels
Work EnvironmentCollaborates on complex projects, mentors juniors, leads technical effortsDesigns, develops, tests software; may work on specific modules or systems
Industry UsageCommonly used in tech companies, startups, and enterprise firmsWidely used across industries, often interchangeable with developer roles

The main difference is that Senior Software Developers typically have more experience, leadership responsibilities, and focus on complex project oversight, while Software Engineers may focus more on designing and implementing software solutions. Both roles require similar credentials and are integral in software development teams, but Senior Software Developers often take on mentorship and strategic tasks.

More about Senior Software Developer jobs

What are the most commonly searched types of Software Developer jobs in O'Fallon, IL?

The most popular types of Software Developer jobs in O'Fallon, IL are:

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For Senior Software Developer jobs in O'Fallon, IL, the most frequently searched job titles are:

What cities near O'Fallon, IL are hiring for Senior Software Developer jobs?

Cities near O'Fallon, IL with the most Senior Software Developer job openings:

Senior Software Developer jobs near you
Infographic showing various Senior Software Developer job openings in O'Fallon, IL as of August 2026, with employment types broken down into 83% Full Time, 14% Part Time, and 3% Contract. Highlights an 85% Physical, 4% Hybrid, and 11% Remote job distribution, with an average salary of $119,772 per year, or $57.6 per hour.

Senior Software Engineer

Trinity Global Consulting

Saint Louis, MO • On-site

$119K - $157K/yr

Full-time

Medical, Dental, Vision, Life, Retirement, PTO

Re-posted 23 days ago

Job description

Duties may include:
  • Determine operational feasibility by evaluating analysis, problem definition, requirements, solution development and proposed solutions.
  • Document and demonstrating solutions by developing documentation, flowcharts, layouts, diagrams, charts, code comments and clear code.
  • Develop software solutions by studying information needs; studying systems flow, data usage and work processes; investigating problem areas.
  • Tailor and deploy software tools, processes and metrics as needed.
  • Provide information by collecting, analyzing and summarizing development and service issues.
  • Automate tasks through appropriate tools and scripting.
  • Develop architectures that are inherently secure, robust, scalable, modular, and API-centric.
  • Provide software design recommendations to the program manager and Chief Software Engineer.
  • Coordinate software development activities within product lines.
  • Ensure product line software development follows industry and SEI best practices.
  • Assist the Product Line Program Manager in establishing and tracking software metrics.
  • Report software risks to the Chief Systems Engineer and Chief Software Engineer through the ERB.
  • Ensure software is documented and brought under Configuration Management.

Requirements
Required:
  • Bachelor's degree or higher in Computer Science, Information Technology, Management Information Systems, or related STEM degree.
  • Senior-level experience deploying microservices into cloud environments.
  • Senior-level experience using software development tools to estimate functions points, estimate complexity, develop virtual machines, cloud environments.
  • Senior-level experience with history of successful software deployments.

Desired:
  • Master's degree or higher in Engineering, Computer Science, Information Technology, Management Information Systems, or related STEM degree.
  • Senior-level experience in designing, maintaining and recapitalizing IT systems.
  • Senior-level experience in refactoring, containerization and hosting applications in a LINUX platform and infrastructure as a service environment.
  • Demonstrated experience with MBSE, processes, tools and languages.

Benefits
At Trinity Global Consulting (TGC), we value our employees and provide a comprehensive benefits package that includes:
  • Medical, Dental & Vision Coverage - Coverage for eligible employees and family through CareFirst and VSP.
  • Paid Time Off - PTO granted in accordance with contract requirements.
  • Paid Holidays - 11 federal holidays observed annually.
  • Disability & Life Insurance - Short-term/long-term disability, life insurance, and AD&D coverage included.
  • 401(k) Retirement Plan - Competitive plan managed through Ameritas.
  • Professional Training - Formal training provided as required, with additional learning opportunities based on role.

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