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

JS Consulting

Senior Developer

Saint Louis, MO · On-site

$53 - $70/hr

Job Title- Senior Developer Project Location - Hybrid in Saint Louis, MO Duration- Full-time Visa ... Work on the latest web technologies including Angular (19), .Net Core, Web API and Typescript.

GDIT

Senior DevOps Engineer

Saint Louis, MO · On-site

$126K - $162K/yr

Argo CD, GitLab CI/CD, Web Server Management Certifications: None Experience: 6 + years of related ... As a Senior DevOps Engineer you will help ensure today is safe and tomorrow is smarter. Our work ...

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Senior Web Developer information

See O Fallon, IL salary details

$56.4K

$106.9K

$167K

How much do senior web developer jobs pay per year?

As of Aug 10, 2026, the average yearly pay for senior web developer in O'Fallon, IL is $106,859.00, according to ZipRecruiter salary data. Most workers in this role earn between $84,900.00 and $122,700.00 per year, depending on experience, location, and employer.

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.

How much does a senior web developer earn?

A senior web developer's salary typically ranges from $80,000 to $130,000 annually, depending on experience, location, and industry. They often possess skills in JavaScript, HTML, CSS, and frameworks like React or Angular, and may hold certifications that enhance their earning potential.

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 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.

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.
More about Senior Web Developer jobs
What are the most commonly searched types of Web Developer jobs in O'Fallon, IL? The most popular types of Web Developer jobs in O'Fallon, IL are:
What job categories do people searching Senior Web Developer jobs in O'Fallon, IL look for? The top searched job categories for Senior Web Developer jobs in O'Fallon, IL are:
What cities near O'Fallon, IL are hiring for Senior Web Developer jobs? Cities near O'Fallon, IL with the most Senior Web Developer job openings:
Senior Web Developer jobs near you
Infographic showing various Senior Web Developer job openings in O'Fallon, IL as of August 2026, with employment types broken down into 1% Internship, 84% Full Time, 8% Part Time, 1% Temporary, and 6% Contract. Highlights an 82% Physical, 4% Hybrid, and 14% Remote job distribution, with an average salary of $106,859 per year, or $51.4 per hour.

Web Developer - Senior

DecisionPoint | Cortek

Scott Air Force Base, IL

Full-time

Re-posted 3 days ago

Job description

DecisionPoint seeks a Web Developer - Senior to provide web, SharePoint, and portal support for SDDC G6 under the GITSS program. This position supports web-based portals and interfaces that provide office automation, collaboration, command information distribution, staffing tools, and information sharing across the SDDC community. 

The Web Developer - Senior will support requirements analysis, development, configuration, troubleshooting, maintenance, user support, documentation, and compliance activities for SDDC web and SharePoint environments. 

This position is located at HQ SDDC, Scott Air Force Base, IL. 

Note: By applying to this position, you acknowledge and consent to having your resume included in an active competitive government contract bid. 


The Senior Web Developer will:

  • Develop, maintain, configure, and troubleshoot SDDC web-based portals, interfaces, and collaboration tools.  
  • Support SharePoint sites, pages, lists, libraries, workflows, permissions, and related web functionality.  
  • Gather user requirements and translate business or administrative process needs into web-based IT solutions.  
  • Provide support for command information distribution, collaboration tools, staffing tools, and public/private information interfaces.  
  • Maintain web content, site structure, navigation, user access, and operational functionality.  
  • Coordinate with Government leads, cybersecurity staff, systems administrators, and customers to support secure web operations.  
  • Support web application documentation, SOPs, technical guides, and configuration records.  
  • Assist with STIG, ATO/C&A, cybersecurity, access control, records management, and compliance requirements.  
  • Troubleshoot production issues and coordinate resolution with system, database, network, and cybersecurity teams.  
  • Support testing, deployment, change management, and sustainment of web solutions.  

Clearance Requirement: 

  • Must hold an active Secret clearance. 
  • Must be eligible to obtain and maintain required Common Access Card (CAC), facility access, system access, and Government network access. 

Education: 

  • Bachelor’s degree in Computer Science, Information Technology, Web Development, Software Engineering, or related discipline.  

Experience: 

  • Minimum 8 years of web development, SharePoint development, portal administration, or web application support experience.  
  • Experience supporting DoD or federal web environments preferred.  
  • Experience developing or maintaining SharePoint-based collaboration tools and office automation solutions.  
  • Experience supporting secure web applications, access controls, documentation, and production troubleshooting.  

Technical Knowledge: 

  • Knowledge of SharePoint, web content management, HTML/CSS, JavaScript, Power Platform, workflows, permissions, and site administration.  
  • Familiarity with cybersecurity, STIGs, RMF/ATO support, records management, and DoD web compliance requirements.  
  • Ability to support web application sustainment across development, testing, deployment, and operations.  

Certifications (Preferred): 

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