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Senior Front End Software Engineer Jobs in O Fallon, IL

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 ... Partner with the Information Engineers on shared front-end concerns, providing architectural ...

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 ... Partner with the Information Engineers on shared front-end concerns, providing architectural ...

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

Eastman

Senior Software Engineer

Saint Louis, MO · On-site

$114K - $151K/yr

Position Description We are seeking a Senior Software Engineer who is passionate about building ... front-end, back-end, integrations, and deployment workflows. • Take ownership of product features ...

Eastman

Senior Software Engineer

Saint Louis, MO · On-site

$119K - $157K/yr

Position Description We are seeking a Senior Software Engineer who is passionate about building ... front-end, back-end, integrations, and deployment workflows. • Take ownership of product features ...

bioMerieux

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 ...

bioMérieux

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 ...

bioMerieux Inc.

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 ...

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

Senior Front End Software Engineer information

See O Fallon, IL salary details

$66.7K

$136.9K

$184.7K

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

As of Aug 11, 2026, the average yearly pay for senior front end software engineer in O'Fallon, IL is $136,909.00, according to ZipRecruiter salary data. Most workers in this role earn between $114,300.00 and $157,200.00 per year, depending on experience, location, and employer.

What does a senior front end software engineer do?

A Senior Front End Software Engineer is responsible for designing, developing, and maintaining the user interface and experience of web applications. They work with languages like HTML, CSS, and JavaScript, as well as frameworks such as React, Angular, or Vue. Besides writing code, they often mentor junior developers, collaborate with designers and backend engineers, and help define best practices and technical standards for the front end team. Their goal is to ensure that web applications are visually appealing, responsive, and performant.

What are some common challenges senior front end software engineers face when working on large-scale applications?

Senior Front End Software Engineers often encounter challenges such as maintaining code quality and consistency across large teams, ensuring optimal performance as the application scales, and coordinating effectively with backend and design teams. Managing technical debt and keeping up with rapidly evolving front-end technologies can also be demanding. Successful engineers use robust testing, code review processes, and clear communication to overcome these hurdles and deliver high-quality user experiences.

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

To thrive as a Senior Front End Software Engineer, you need advanced proficiency in HTML, CSS, JavaScript, and modern frameworks like React or Angular, typically supported by a relevant degree and several years of experience. Familiarity with version control systems (such as Git), build tools (like Webpack), and testing libraries is essential, and certifications in front-end technologies can be advantageous. Strong problem-solving abilities, effective communication, and leadership skills help you collaborate with cross-functional teams and mentor junior developers. These skills ensure the delivery of scalable, user-friendly applications and contribute to the overall success and innovation of development projects.
What cities near O'Fallon, IL are hiring for Senior Front End Software Engineer jobs? Cities near O'Fallon, IL with the most Senior Front End Software Engineer job openings:
Senior Front End Software Engineer jobs near you
Infographic showing various Senior Front End Software Engineer job openings in O'Fallon, IL as of August 2026, with employment types broken down into 1% Internship, 90% Full Time, 6% Part Time, and 3% Contract. Highlights an 87% Physical, 4% Hybrid, and 9% Remote job distribution, with an average salary of $136,909 per year, or $65.8 per hour.

Software Engineer - Frontend

Augustine Institute Inc

Florissant, MO • On-site

Full-time

Re-posted 4 days ago

Job description

Position: Software Engineer - Frontend

Schedule: Full Time

Reporting to: VP Technology


Position Summary

The Augustine Institute seeks a Senior Frontend Engineer to design, build, and maintain the user-facing experiences across its digital platforms. This role is primarily responsible for establishing foundational front-end architecture and design systems for customer-facing platforms, setting code-level implementation standards, and working closely with Product to deliver high-quality, consistent UI experiences across the Augustine Institute’s portfolio of brands.

Specific duties are listed below, but may not be all-inclusive.


Qualifications

Significant, demonstrable, and proven experience in:

  • Building, implementing, and maintaining front-end architecture and design systems that yield consistent UX interactions and high-quality UI aesthetics
  • Iterative development and designing experiences behind feature flags for graduated rollout and testing
  • Data-driven approaches to optimizing user experiences across multiple applications
  • React + Next.js for web development
  • React Native + Expo for mobile development
  • Tailwind CSS
  • Building multi-profile / sub-account experiences (e.g., family, organization, and children’s profiles)
  • Deploying front-end code at enterprise and multi-hundred-thousand user scale (e.g., Cloudflare Pages, Vercel, AWS Amplify, ECS/Fargate, EC2, S3 + CloudFront)
  • Managing llms.txt standards and designing with AI discoverability (“AI SEO”) in mind alongside traditional search SEO


Experience with or strong understanding of (preferred):

  • LaunchDarkly or similar feature-flag tools
  • New Relic or similar observability and monitoring tools
  • Front-end tracking tools such as Mixpanel
  • Video infrastructure integration (Mux or similar) in the front end
  • Designing group or family-based features including shared experiences and watch parties
  • Learning Management System (LMS) platforms and their core UI components


  • Bachelor’s degree or equivalent practical experience


Skills and Abilities

  • Ability to think cross-product, creating unique experiences for each brand (Formed, Amen, etc.) while sharing the same underlying core elements that make it feel like “the Augustine Institute”
  • Ability to design UX/UI across distinct use cases built on the same core platform, adapting to different user contexts and personas
  • Ability to understand when users need onboarding support and design in-app guides accordingly
  • Experience maintaining UI code and documentation that enables both human collaboration and AI-assisted development, while ensuring AI adheres to design system and architectural standards
  • Strong ability to perform quality assurance and security testing on all front-end code
  • Ability to identify when niche specialists are needed and effectively delegate work to contractors, ensuring output meets quality standards and includes sufficient knowledge transfer for ongoing in-house maintenance
  • Commitment to demonstrate consistently the Augustine Institute’s core values including:
    • Humility – We serve the Augustine Institute Mission with humility and a service mind-set.
    • Collaboration – We work together as a united Body of Christ.
    • Innovation – We encourage being creative and demonstrating a clever mindset.
    • Excellence – We strive in everything we do to win souls for Christ.


Physical Demands

While performing the duties of this job, the employee is regularly required to perform stooping, kneeling, crouching, reaching, standing, walking, lifting, typing and use of office equipment, talking, hearing, seeing, and repetitive motions.


Work Environment

While performing the duties of this job, the employee will typically work in a climate-controlled office setting.