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Software Engineer Jobs in O Fallon, MO (NOW HIRING)

Ports North

Lead Software Engineer

O Fallon, MO · On-site

$120 - $190/hr

We have partnered with our client in their search for a Lead Software Engineer in O'Fallon, MO. Responsibilities * This job is a developing subject matter expert in the Software Engineering area ...

MasterCard

Lead Software Engineer

O Fallon, MO · Hybrid

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Title and Summary Lead Software Engineer Overview: Mastercard's Global Credit Authorization team is seeking a Lead Software Engineer (C/C++) to build and enhance high-performance, mission-critical ...

Equifax

Software Engineer - Intermediate

Saint Louis, MO · On-site

  • Medical

  • Retirement

  • PTO

Our software engineering positions provide you the opportunity to join a team of talented engineers working with leading-edge technology. You are ideal for this position if you are a forward-thinking ...

MasterCard

Senior Software Engineer

O Fallon, MO · On-site

$114K - $151K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Title and Summary Senior Software Engineer Who is Mastercard? Mastercard is a global technology company in the payments industry. Our mission is to connect and power an inclusive, digital economy ...

Equifax, Inc.

Senior Software Engineer

Saint Louis, MO · On-site

$119K - $157K/yr

  • Medical

  • Retirement

  • PTO

Our software engineering positions provide you the opportunity to join a team of talented engineers working with leading-edge technology. You are ideal for this position if you are a forward-thinking ...

Eastman Chemical Co.

Senior Software Engineer

Saint Louis, MO · On-site

$116K - $153K/yr

Position Description We are seeking a Senior Software Engineer who is passionate about building modern, customer-facing applications and who also brings strength in cloud engineering and software ...

Equifax

Senior Software Engineer

Saint Louis, MO · On-site

$116K - $153K/yr

  • Medical

  • Retirement

  • PTO

Our software engineering positions provide you the opportunity to join a team of talented engineers working with leading-edge technology. You are ideal for this position if you are a forward-thinking ...

Mastercard, Inc.

Lead Software Engineer

O Fallon, MO · On-site

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Title and Summary Lead Software Engineer Overview: Mastercard's Global Credit Authorization team is seeking a Lead Software Engineer (C/C++) to build and enhance high-performance, mission-critical ...

MasterCard

Lead Software Engineer

O Fallon, MO

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Title and Summary Lead Software Engineer Overview Mastercard is a global technology company in the payments industry, focused on powering an inclusive, digital economy that makes transactions safe ...

MiTek USA Inc

Software Engineer

Earth City, MO · On-site

  • Medical

  • Dental

  • Vision

  • Retirement

  • PTO

Job Responsibilities & Requirements We are seeking a Software Engineer to design, develop, and maintain software that powers automated saw systems used in the truss and building materials industry.

Mastercard, Inc.

Lead Software Engineer

O Fallon, MO · On-site

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Title and Summary Lead Software Engineer Overview Mastercard is a global technology company in the payments industry, focused on powering an inclusive, digital economy that makes transactions safe ...

MasterCard

Lead Software Engineer

O Fallon, MO

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Title and Summary Lead Software Engineer Overview Mastercard is a global technology company in the payments industry, focused on powering an inclusive, digital economy that makes transactions safe ...

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 modern, customer-facing applications and who also brings strength in cloud engineering and software ...

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All JobsSoftware Engineer JobsSoftware Engineer Jobs in O'Fallon, MO

Software Engineer information

See O Fallon, MO salary details

$59.4K

$138K

$192.2K

How much do software engineer jobs pay per year?

As of Aug 18, 2026, the average yearly pay for software engineer in O'Fallon, MO is $138,005.00, according to ZipRecruiter salary data. Most workers in this role earn between $112,300.00 and $161,800.00 per year, depending on experience, location, and employer.

What is a software engineer?

Software Engineers are professionals who design, develop, test, and maintain computer software and systems. They use programming languages, engineering principles, and problem-solving skills to build applications, websites, or software solutions that meet specific needs. Software Engineers may work in a variety of industries, such as technology, finance, healthcare, or entertainment, collaborating with other team members to deliver functional and reliable software. Their role often involves analyzing user requirements, writing code, debugging errors, and continually improving software performance.

What are the key skills and qualifications needed to thrive as a software engineer, and why are they important?

To thrive as a Software Engineer, you need strong programming skills, problem-solving abilities, and a degree in computer science or a related field. Familiarity with coding languages (such as Python, Java, or C++), version control systems like Git, and knowledge of software development methodologies are typically required. Excellent teamwork, communication, and adaptability distinguish top performers in this role. These skills ensure efficient, high-quality software development that meets user needs and adapts to technological changes.

What are some common challenges software engineers face when collaborating on large development teams?

Software engineers working on large teams often encounter challenges with communication, code integration, and maintaining consistent coding standards. Coordinating across multiple developers can lead to merge conflicts and misunderstandings about project requirements or priorities. Adopting tools like version control systems, regular code reviews, and clear documentation helps mitigate these issues. Building strong collaboration skills and proactively seeking clarification are key to ensuring smooth teamwork and project success.

What is the difference between Software Engineer vs Software Developer?

AspectSoftware EngineerSoftware Developer
CredentialsBachelor's degree in CS or related field, certificationsBachelor's degree often preferred, certifications optional
Work EnvironmentDesigning, developing, testing, and maintaining software systemsWriting, coding, and implementing software applications
Industry UsageUsed across tech, finance, healthcare, and more for system-level rolesCommonly used in app and web development projects
Search IntentUnderstanding roles, responsibilities, and qualificationsLearning about coding, programming, and project work

While both roles involve software creation, Software Engineers typically focus on designing and architecting complex systems, whereas Software Developers mainly concentrate on coding and building specific applications. The roles often overlap, but the Engineer role may require broader system knowledge and design skills.

Are software engineers still in demand?

Yes, software engineers are in high demand across many industries due to ongoing digital transformation, the growth of cloud computing, and the need for software development, maintenance, and cybersecurity skills. The profession offers strong job stability, competitive salaries, and opportunities to work with various programming languages and tools.

Is 25 too late to become a software engineer?

Age is not a barrier to becoming a software engineer; many professionals start careers in tech in their mid-20s or later. Success depends on acquiring relevant skills, such as programming languages and problem-solving, often through coding bootcamps, online courses, or formal education. Employers value skills and experience over age, making it possible to enter the field at 25 or older.
More about Software Engineer jobs

What are the most commonly searched types of Software Engineer jobs in O'Fallon, MO?

The most popular types of Software Engineer jobs in O'Fallon, MO are:

What are popular job titles related to Software Engineer jobs in O'Fallon, MO?

For Software Engineer jobs in O'Fallon, MO, the most frequently searched job titles are:

What cities near O'Fallon, MO are hiring for Software Engineer jobs?

Cities near O'Fallon, MO with the most Software Engineer job openings:

Software Engineer jobs near you
Infographic showing various Software Engineer job openings in O'Fallon, MO as of August 2026, with employment types broken down into 60% Full Time, and 40% Contract. Highlights an 80% In-person, and 20% Remote job distribution, with an average salary of $138,005 per year, or $66.3 per hour.

Lead Software Engineer

Ports North

O Fallon, MO • On-site

$120 - $190/hr

Other

Posted 13 days ago

Job description

We have partnered with our client in their search for a Lead Software Engineer in O'Fallon, MO.

Responsibilities
  • This job is a developing subject matter expert in the Software Engineering area, influencing stakeholders and applying advanced knowledge to drive achievement of area goals and initiatives by contributing to solution development and improvements for existing products, services, and/or processes.
Skills Required
  • Develops and maintains high-quality, scalable software solutions, ensuring security and operational resilience.
  • Performs thorough code reviews, providing constructive feedback to uphold quality standards.
  • Designs, develops, and delivers complex software solutions aligned with business needs and organizational standards.
  • Creates detailed technical artifacts, including requirements documents, design specifications, test plans, and deployment strategies.
  • Performs system maintenance, incident management, root cause analysis, and problem resolution in complex production environments.
  • Evaluates emerging technologies and frameworks, conducting Proof of Concept (PoCs) evaluations.
  • Maintains solution and technology roadmaps, contributing to strategic planning and innovation while promoting best practices in SDLC, testing, and security.
  • Guides and mentors junior team members through on-the-job experiences, reviewing work and fostering a culture of continuous improvement to grow expertise around their discipline.
Education & Work Experience
  • Bachelor's degree in related field
  • 7+ years of experience
Title

Lead Software Engineer

Location

O'Fallon, MO

Client Industry

Fintech

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