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Senior Web Developer Jobs in Belleville, IL (NOW HIRING)

Worky

Senior Software Developer

O Fallon, IL · On-site

$110 - $120/hr

We are seeking a Java Developer with experience developing Web applications to be part of the ... As a Senior Software Developer, the selected individual will work hands‑on with developer and ...

teKnoluxion

Senior DevOps Engineer

Saint Louis, MO

$126K - $162K/yr

Overview Senior DevOps Engineer Springfield, VA or St. Louis, MO Active TS (SCI eligibility ... Configure CI/CD for multiple web applications * Take source code, dependencies to perform ...

HCL Global Systems Inc

Sr Java Developer

Saint Louis, MO · On-site

$55.75 - $71/hr

... Sr Java Developer to build end-to-end business solutions. The ideal candidate will work on both ... SOAP web services, Hibernate, SQL, Tomcat, Application servers (WebSphere), SONAR, Agile, AJAX ...

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 ... Architect, build, and maintain web application infrastructure and the data systems that support ...

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 ... Architect, build, and maintain web application infrastructure and the data systems that support ...

The Timberline Group

Senior Software Developer

Saint Louis, MO · On-site +1

$53 - $70/hr

Senior Software Developer(s) to design custom software solutions based on client requirements. This ... REST & Web Services 7. Node.js or React.js The Timberline Group Phone: 636-209-5537 PO Box 385 ...

Elevance Health

BI Developer Senior

Saint Louis, MO · Hybrid

The BI Developer Senior is responsible for participating in all phases of the design and ... Collaborates with engineers for creative ideas for Web portals supporting interactive content ...

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Senior Web Developer information

See Belleville, IL salary details

$58.8K

$111.3K

$173.9K

How much do senior web developer jobs pay per year?

As of Aug 22, 2026, the average yearly pay for senior web developer in Belleville, IL is $111,269.00, according to ZipRecruiter salary data. Most workers in this role earn between $88,400.00 and $127,700.00 per year, depending on experience, location, and employer.

What is a senior web developer?

A senior web developer is a highly skilled computer coding professional with fluency in languages such as HTML, JavaScript, and CSS. In this career, your responsibilities include designing, developing, and debugging the backend of software programs for websites, applications, tools, and databases. You also work with JavaScript frameworks, develop tests using testing frameworks, help build and deploy automation scripts, troubleshoot, and resolve app performance issues. As a senior web developer, you may supervise a team of developers and collaborate with user experience designers to determine what the frontend user experience and website layout will look like during the design phase. Other duties may include enforcing coding standards, reviewing the work completed by your team, managing the budget and project schedule, and communicating directly with clients.

What are the key skills and qualifications needed to thrive as a senior web developer, and why are they important?

To thrive as a Senior Web Developer, you need advanced proficiency in programming languages like JavaScript, HTML, CSS, and backend frameworks, supported by a bachelor’s degree in computer science or equivalent experience. Expertise in tools such as version control (Git), CI/CD pipelines, and knowledge of modern frameworks (React, Angular, Node.js) are typically required, along with relevant certifications. Strong problem-solving ability, effective communication, and leadership skills help you collaborate across teams and mentor junior developers. These competencies ensure high-quality, scalable web solutions and support successful project delivery in dynamic development environments.

What are some common challenges faced by senior web developers when leading project teams?

Senior Web Developers often encounter challenges such as balancing hands-on coding responsibilities with mentoring junior team members and ensuring project deadlines are met. They must also navigate evolving technologies and frameworks, which requires ongoing learning and adaptability. Effective communication with designers, backend developers, and project managers is essential to align technical solutions with business goals. Successfully managing these aspects leads to smoother project delivery and professional growth.

What is the difference between Senior Web Developer vs Web Developer?

AspectSenior Web DeveloperWeb Developer
Required CredentialsBachelor's in CS or related, experience, possibly certificationsBachelor's in CS or related, entry-level or junior experience
Work EnvironmentCollaborates on complex projects, mentors juniorsDevelops websites, learns on the job, less responsibility
Employer & Industry UsageTech companies, agencies, startupsSmall businesses, startups, freelance projects
Search & Comparison IntentUnderstanding senior roles, career progressionEntry-level, learning web development

The main difference between a Senior Web Developer and a Web Developer lies in experience, responsibilities, and expertise. Senior Web Developers handle complex projects, mentor team members, and often have more advanced skills and certifications. Web Developers are typically entry-level or junior roles focused on building websites and gaining experience. Both roles are essential in the tech industry, but the senior position involves greater leadership and technical depth.

More about Senior Web Developer jobs

What are the most commonly searched types of Web Developer jobs in Belleville, IL?

The most popular types of Web Developer jobs in Belleville, IL are:

What job categories do people searching Senior Web Developer jobs in Belleville, IL look for?

The top searched job categories for Senior Web Developer jobs in Belleville, IL are:

What cities near Belleville, IL are hiring for Senior Web Developer jobs?

Cities near Belleville, IL with the most Senior Web Developer job openings:

Senior Web Developer jobs near you
Infographic showing various Senior Web Developer job openings in Belleville, IL as of August 2026, with employment types broken down into 78% Full Time, 15% Part Time, 1% Temporary, and 6% Contract. Highlights an 82% Physical, 4% Hybrid, and 14% Remote job distribution, with an average salary of $111,269 per year, or $53.5 per hour.

Senior Software Developer

Worky

O Fallon, IL • On-site

$110 - $120/hr

Other

Posted 4 days ago

Job description

Everforth ECS is seeking a Senior Software Developer to work in our O’Fallon, IL office.

ECS Federal LLC is looking for a Senior Software Developer who possesses and applies expertise on multiple complex work assignments. The ECS Team provides development and support of GATES, a mission-critical application providing cargo and passenger manifesting and in transit visibility requirements for the DoD. We are seeking a Java Developer with experience developing Web applications to be part of the larger team. Assignments may be broad in nature, requiring originality and innovation in determining how to accomplish tasks. Operates with appreciable latitude in developing methodology and presenting solutions to problems. Contributes to deliverables and performance metrics. As a Senior Software Developer, the selected individual will work hands‑on with developer and systems administrators to integrate our solutions and products for our government customer. Key responsibilities are to deliver DevSecOps pipeline solutions and proof of concepts for Continuous Integration/Configuration, Continuous Development, Continuous Delivery/Deployment, Continuous Testing, Continuous Security and Continuous Monitoring. The DevSecOps Engineer is also responsible for driving solutions that meet the customers' technical, financial and business requirements, and supporting a legacy system in the process of being modernized while being hosted in the cloud utilizing DevSecOps processes.

Salary Range: $110,000 - $120,000

General Description of BenefitsQualifications
  • Bachelor's Degree
  • Java, HTML5 technologies, Angular, Spring, RHEL, SQL, Oracle RDBMS, JavaScript, XML, Agile methodologies, WebLogic, Tomcat, Gradle/Maven/Ant, Python
  • Experience with DevSecOps pipeline
  • Secret Clearance
  • Security + Certification or the ability to obtain immediately following employment.
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