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

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 ...

Deegit Inc

OSM Sr Developer - St. Louis, MO

Saint Louis, MO · On-site

$53 - $70/hr

OSM Sr Developer Location: St. Louis, MO Duration: 3+ Months Contract --> 8+ years of professional ... Web services. --> Familiarity with a majority of the following: Linux, Solaris, Oracle 10g, SVN ...

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Showing results 21-40

All JobsWeb Developer JobsSenior Web Developer JobsSenior Web Developer Jobs in O'Fallon, IL

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 11, 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.

.NET Developer - mid-to-senior

The Timberline Group

Overland, MO • On-site

Full-time

Posted 20 days ago

Job description

US Citizens or GC Holders only - Direct-Hire
Local candidates only
Onsite- 4-5 days per weekWe're hiring a mid-to-senior .NET Developer for an onsite contract role in St. Louis. The right candidate is comfortable across the full Microsoft stack — .NET, SQL Server, and ASP.NET — and can plug into an existing environment and contribute quickly. Experience with Microsoft Dynamics GP (Great Plains) is a strong plus but not required.
Responsibilities:
  • Design, develop, and maintain applications using .NET, C#, and ASP.NET
  • Build, optimize, and tune SQL Server databases — T-SQL, stored procedures, views, performance tuning
  • Support and enhance existing web applications and internal tools
  • Translate business requirements into clean, maintainable technical solutions
  • Troubleshoot, debug, and resolve production issues across the stack
  • Integrate with internal systems and third-party APIs as needed
  • Where applicable, support or extend Dynamics GP customizations, integrations, or reporting
Required:
  • 5+ years of professional .NET development (.NET Framework and/or .NET Core)
  • Strong C# and ASP.NET (Web Forms and/or MVC)
  • Solid SQL Server experience — T-SQL, stored procedures, query optimization
  • Full SDLC experience — requirements, design, development, testing, deployment
  • Strong communication skills; comfortable with technical and non-technical stakeholders
  • Able to work fully onsite in St. Louis, MO
Preferred:
  • Microsoft Dynamics GP (Great Plains) — customizations, integrations, or reporting
  • ASP.NET MVC, Web API, or .NET Core
  • Front-end familiarity (JavaScript, jQuery, Bootstrap, Razor)
  • Source control with Git, TFS, or Azure DevOps
  • Reporting tools — SSRS, Crystal Reports, or Power BI