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Senior Software Developer Jobs in Belleville, IL

Louis, MO Our client seeks a Senior Software Developer to support modernization and maintenance of a mission-critical enterprise application in AWS for the U.S. Treasury. The role requires full-stack ...

Senior Software Developer

Saint Louis, MO · On-site

$53 - $70/hr

Powered by Athletes who get it, and Engineers who can do it. Role Purpose This role exists to be the connective tissue between cross-functional teams, translating complex system trade-offs into clear ...

Senior Software Developer

Saint Louis, MO · On-site

$53 - $70/hr

Powered by Athletes who get it, and Engineers who can do it. Role Purpose This role exists to be the connective tissue between cross-functional teams, translating complex system trade-offs into clear ...

Senior Software Developer

Saint Louis, MO · On-site

$53 - $70/hr

Powered by Athletes who get it, and Engineers who can do it. Role Purpose This role exists to be the connective tissue between cross-functional teams, translating complex system trade-offs into clear ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

Senior Software Engineer

Saint Louis, MO · On-site

$119K - $157K/yr

Senior Software Engineer Location: St. Louis, MO Security Clearance: Active TS/SCI (or SCI ... Experience as a full stack developer to include Web Services, Database and Front-End Development

Senior Software Engineer

Saint Louis, MO · On-site

$114K - $151K/yr

We require Senior Software Engineers with a strong focus on AI-Native development. Proficiency in utilizing various Agentic coding tools to significantly amplify impact and accelerate implementations ...

Lead Software Developer

Saint Louis, MO · On-site +1

$112K - $141K/yr

The individual in this role is a senior member of the IT team who is able to understand the use of ... Software Engineering role. * 6+ years of programming experience in C# .NET. * Past experience ...

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Senior Software Developer information

See Belleville, IL salary details

$14

$59

$85

How much do senior software developer jobs pay per hour?

As of Aug 12, 2026, the average hourly pay for senior software developer in Belleville, IL is $59.96, according to ZipRecruiter salary data. Most workers in this role earn between $50.91 and $67.26 per hour, depending on experience, location, and employer.

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 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 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 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.

What are the most commonly searched types of Software Developer jobs in Belleville, IL? The most popular types of Software Developer jobs in Belleville, IL are:
What are popular job titles related to Senior Software Developer jobs in Belleville, IL? For Senior Software Developer jobs in Belleville, IL, the most frequently searched job titles are:
What job categories do people searching Senior Software Developer jobs in Belleville, IL look for? The top searched job categories for Senior Software Developer jobs in Belleville, IL are:
What cities near Belleville, IL are hiring for Senior Software Developer jobs? Cities near Belleville, IL with the most Senior Software Developer job openings:
Infographic showing various Senior Software Developer job openings in Belleville, IL as of August 2026, with employment types broken down into 1% Internship, 84% Full Time, 12% Part Time, and 3% Contract. Highlights an 87% Physical, 4% Hybrid, and 9% Remote job distribution, with an average salary of $124,715 per year, or $60 per hour.

Senior Software Developer

The Timberline Group

Saint Louis, MO • On-site, Remote

$53 - $70/hr

Full-time

Re-posted 12 days ago


Job description

Senior Software Developer(s) to design custom software solutions based on client requirements. This position will have a lead role in the development and enhancements of a large data management system. This will be an ongoing effort to replace and support the data management system as needs change by utilizing written Visual Basic with Java services and an Angular user interface. Individuals will apply advanced theoretical knowledge of computer science principles and concepts to perform the duties of the position. Job responsibilities and duties include:
1. Analyze and develop complex solutions based on this customer's needs.
2. Develop technical documentation.
3. Design screen layouts for high productivity.
4. Develop data management system user interface Angular, Ricola and JavaScript (including JSP, XML, HTML, and associated technologies) in an n-tier development environment.
5. Use GIT and SVN version control systems for code management.
6. Develop controls that call Rest based services to access back-end functionality.
7. Attend daily scrums.
8. Implement automated and manual code review and testing using state of the art quality control and testing processes.
This position has no direct reports and does not supervise the work of any other employees.
Minimum Requirements:
Master's degree in Computer Science, Information Technology, Software or Computer Engineering, or any related IT or Engineering field of study plus at least two (2) years of experience in the job offered or in any related position(s) in which the required experience was gained.
Qualified applicants must also have demonstrable proficiency, skill, experience, and knowledge with the following:
1. Demonstrated knowledge in object-oriented application development principles, theories, and concepts.
2. Development experience in Angular, JavaScript, XML, HTML, CSS, and associated technologies.
3. N-tier development environment.
4. Demonstrated experience working with end users to resolve business and technical issues with software.
5. Demonstrated experience analyzing complex business problems and translating to user interface designs.
6. Experience interfacing with REST & Web Services
7. Node.js or React.js