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Front End Software Engineer Jobs in O Fallon, IL

CYNET SYSTEMS

Frontend Engineer

Saint Louis, MO · On-site

$45 - $50/hr

We deliver agile, scalable talent solutions across IT, engineering, life sciences, clinical, and professional staffing, powered by a high-performing recruitment engine operating across North America ...

Omni Federal

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

CYNET SYSTEMS

Frontend Engineer

Saint Louis, MO · On-site

$45 - $50/hr

We deliver agile, scalable talent solutions across IT, engineering, life sciences, clinical, and professional staffing, powered by a high-performing recruitment engine operating across North America ...

Leidos

Mid-Level Software Engineer

Wood River, IL · On-site

$87K - $157K/yr

Leidos is seeking a talented Mid-Level Full Stack Software Engineer to join the Chinook Program ... Go * Front-end and Back-end Frameworks: React, Angular, Vue.js, jQuery, Spring Boot, Django ...

Leidos

Mid-Level Software Engineer

East Saint Louis, IL · On-site

$87K - $157K/yr

Leidos is seeking a talented Mid-Level Full Stack Software Engineer to join the Chinook Program ... Go * Front-end and Back-end Frameworks: React, Angular, Vue.js, jQuery, Spring Boot, Django ...

Leidos

Mid-Level Software Engineer

Collinsville, IL · On-site

$87K - $157K/yr

Leidos is seeking a talented Mid-Level Full Stack Software Engineer to join the Chinook Program ... Go * Front-end and Back-end Frameworks: React, Angular, Vue.js, jQuery, Spring Boot, Django ...

Leidos

Mid-Level Software Engineer

Madison, IL · On-site

$87K - $157K/yr

Leidos is seeking a talented Mid-Level Full Stack Software Engineer to join the Chinook Program ... Go * Front-end and Back-end Frameworks: React, Angular, Vue.js, jQuery, Spring Boot, Django ...

Leidos

Mid-Level Software Engineer

Columbia, IL · On-site

$87K - $157K/yr

Leidos is seeking a talented Mid-Level Full Stack Software Engineer to join the Chinook Program ... Go * Front-end and Back-end Frameworks: React, Angular, Vue.js, jQuery, Spring Boot, Django ...

Leidos

Mid-Level Software Engineer

South Roxana, IL · On-site

$87K - $157K/yr

Leidos is seeking a talented Mid-Level Full Stack Software Engineer to join the Chinook Program ... Go * Front-end and Back-end Frameworks: React, Angular, Vue.js, jQuery, Spring Boot, Django ...

Leidos

Mid-Level Software Engineer

Bridgeton, MO · On-site

$87K - $157K/yr

Leidos is seeking a talented Mid-Level Full Stack Software Engineer to join the Chinook Program ... Go * Front-end and Back-end Frameworks: React, Angular, Vue.js, jQuery, Spring Boot, Django ...

Leidos

Mid-Level Software Engineer

Maryville, IL · On-site

$87K - $157K/yr

Leidos is seeking a talented Mid-Level Full Stack Software Engineer to join the Chinook Program ... Go * Front-end and Back-end Frameworks: React, Angular, Vue.js, jQuery, Spring Boot, Django ...

Leidos

Mid-Level Software Engineer

Fairview Heights, IL · On-site

$87K - $157K/yr

Leidos is seeking a talented Mid-Level Full Stack Software Engineer to join the Chinook Program ... Go * Front-end and Back-end Frameworks: React, Angular, Vue.js, jQuery, Spring Boot, Django ...

Leidos

Mid-Level Software Engineer

Saint Louis, MO · On-site

$87K - $157K/yr

Leidos is seeking a talented Mid-Level Full Stack Software Engineer to join the Chinook Program ... Go * Front-end and Back-end Frameworks: React, Angular, Vue.js, jQuery, Spring Boot, Django ...

Leidos

Mid-Level Software Engineer

Belleville, IL · On-site

$87K - $157K/yr

Leidos is seeking a talented Mid-Level Full Stack Software Engineer to join the Chinook Program ... Go * Front-end and Back-end Frameworks: React, Angular, Vue.js, jQuery, Spring Boot, Django ...

Leidos

Mid-Level Software Engineer

Hartford, IL · On-site

$87K - $157K/yr

Leidos is seeking a talented Mid-Level Full Stack Software Engineer to join the Chinook Program ... Go * Front-end and Back-end Frameworks: React, Angular, Vue.js, jQuery, Spring Boot, Django ...

Leidos

Mid-Level Software Engineer

East Carondelet, IL · On-site

$87K - $157K/yr

Leidos is seeking a talented Mid-Level Full Stack Software Engineer to join the Chinook Program ... Go * Front-end and Back-end Frameworks: React, Angular, Vue.js, jQuery, Spring Boot, Django ...

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Showing results 21-40

All JobsFront End Software Engineer JobsFront End Software Engineer Jobs in O'Fallon, IL

Front End Software Engineer information

See O Fallon, IL salary details

$56.9K

$129.6K

$184.7K

How much do front end software engineer jobs pay per year?

As of Aug 7, 2026, the average yearly pay for front end software engineer in O'Fallon, IL is $129,597.00, according to ZipRecruiter salary data. Most workers in this role earn between $105,400.00 and $150,600.00 per year, depending on experience, location, and employer.

What is the difference between Front End Software Engineer vs Web Developer?

AspectFront End Software EngineerWeb Developer
Primary FocusBuilding and optimizing user interfaces and client-side applicationsDeveloping websites and web applications, including both front-end and back-end tasks
Skills & CertificationsHTML, CSS, JavaScript, frameworks (React, Angular), UI/UX designHTML, CSS, JavaScript, sometimes back-end languages (PHP, Python), CMS platforms
Work EnvironmentTech companies, startups, agencies focusing on user experienceWeb development agencies, freelance, corporate websites

While both roles involve web development, a Front End Software Engineer specializes in creating and optimizing the visual and interactive aspects of applications, often working with advanced frameworks. Web Developers may handle broader tasks, including back-end development, and may work on entire websites. The choice depends on whether you prefer a specialized front-end focus or a more general web development role.

What is a front end software engineer?

A front end software engineer or developer designs websites and applications, often using JavaScript and CSS, to ensure that client-side software can run them optimally. As a front end software engineer, you must evaluate system design, networking, and data compression to ensure a website or application is efficient and can handle high-volume traffic. Your focus is on web usability and a seamless user experience. Qualifications include a bachelor’s degree in information technology or computer science. Companies expect a front end software engineer to understand JavaScript, CSS, and HTML. You can gain additional employment opportunities with knowledge of C++, AJAX, and Python.

What does a front end software engineer do?

A Front End Software Engineer is responsible for designing, developing, and maintaining the user-facing parts of websites and web applications. They use technologies like HTML, CSS, and JavaScript to create interactive and visually appealing interfaces that users interact with directly. Additionally, they work closely with designers and back end developers to ensure seamless integration and optimal user experiences. Their role often involves optimizing web performance, ensuring cross-browser compatibility, and implementing responsive design for various devices.

What are the key skills and qualifications needed to thrive as a front end software engineer?

To thrive as a Front End Software Engineer, you need strong proficiency in HTML, CSS, JavaScript, and modern frameworks such as React or Angular, often supported by a relevant degree or equivalent experience. Familiarity with version control systems like Git, responsive design tools, and testing frameworks is typically required. Excellent problem-solving, attention to detail, and effective communication skills help you collaborate with designers and back-end engineers. These abilities ensure you can build user-friendly, visually appealing, and high-performing web applications that meet both technical and business requirements.

How does a front end software engineer typically collaborate with designers and back-end developers during a project?

Front End Software Engineers work closely with designers to translate UI/UX mockups into interactive, responsive web interfaces, ensuring the final product aligns with the intended user experience. They also collaborate with back-end developers to integrate APIs and data services, often participating in joint planning sessions and code reviews to align on functionality and performance requirements. Regular communication, using tools like Jira or Slack, and participation in agile ceremonies like stand-ups and sprint planning, are standard practices to keep workflows smooth and ensure alignment across teams.
More about Front End Software Engineer jobs
What cities near O'Fallon, IL are hiring for Front End Software Engineer jobs? Cities near O'Fallon, IL with the most Front End Software Engineer job openings:
Front End Software Engineer jobs near you
Infographic showing various Front End Software Engineer job openings in O'Fallon, IL as of August 2026, with employment types broken down into 90% Full Time, 5% Part Time, and 5% Contract. Highlights an 83% In-person, 3% Hybrid, and 14% Remote job distribution, with an average salary of $129,597 per year, or $62.3 per hour.

Senior Software Engineer

AVALA Marketing Group

Saint Louis, MO • On-site

$119K - $157K/yr

Full-time

Retirement, PTO

Re-posted 21 days ago

Job description

Company Description

AVALA helps brands selling high consideration goods and services through dealer networks, drive more revenue throughout the entire customer lifecycle. We combine data, digital strategies, and technology to increase visibility, deliver leads, close more sales, increase customer lifetime value, and maximize your marketing ROI.
Our talented team of experts use AIMBASE, our automated intelligent marketing platform to implement successful digital marketing strategies based on processes and best practices that have been refined over thousands of campaigns.

The AVALA Marketing Group is a full service marketing agency that places a high value on building a group of passionate and creative developers. We hire software engineers and technology enthusiasts who enjoy being challenged by problems of scale and complexity, with a strong desire to make services better for users. With long term and a continual cycle of fresh new projects, the work life is always fresh and exciting.

Contact us to learn more: http://www.avalamarketing.com/


Job Description

As a software engineer, your role will be working on our critical production applications and infrastructure. You will be involved with technology solutions that are new and engaging. You will be in the thick of solving complex issues, architecting solutions, and developing applications.

Writing server-side code for web-based applications

Creating robust high-volume production applications

Working closely with other developers to design architectures and user interfaces

Building web-based interactive applications using client based script technologies

Designing, building, and testing software

Taking part in reviews of your own and other developer's code

Working closely with the project manager to define requirements

Finding ways to solve difficult problems using initiative and creativity

Identifying ways to continually improve and refine processes

Contributing wherever necessary to help the team reach its goals

Participate in Agile development using SCRUM and KANBAN

Research new technologies and determine how to use them to improve the product


Qualifications

5+ years of relevant work experience

Extensive programming experience in ASP.NET and C#

Strong object-oriented skills and design pattern methodologies

Proficiency in relational databases and data schema design

High level of expertise in client scripting technologies, web services, and use of AJAX

Microsoft .NET Framework 3.5, 4.0, or 4.5 experience (C# preferred)

Microsoft ADO.NET Entity Framework and LINQ

ASP.NET MVC

jQuery, Spine.js, and other client scripting packages

Microsoft SQL Server 2012 and newer

T-SQL, Common Table Expressions, Table Variables, Functions

WCF web services, or WebAPI

Front-end development using responsive design patterns

Additional Information

Salary is negotiable and based on experience

Sign on bonus

401k with employer match and profit sharing plan

Full benefits package, and paid vacations and holidays

Software architect and team leadership role advancement available

Casual dress code, dog-friendly office

Apply