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

Boeing

Software Engineer

Maryland Heights, MO · On-site

  • Medical

  • Life

  • Retirement

Software Engineer Company: Tapestry - G0G Tapestry Solutions, A Boeing Company, brings over 30 years of industry experience designing, implementing, training, and supporting high-quality, cost ...

Mastercard, Inc.

Senior Software Engineer

O Fallon, MO · On-site

$114K - $151K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Title and Summary Senior Software Engineer Overview Mastercard's Network & Digital Payments group creates meaningful digital payment experiences for consumers, merchants, issuers, and partners at ...

MasterCard

Senior Software Engineer

O Fallon, MO

$114K - $151K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Title and Summary Senior Software Engineer Overview Mastercard's Network & Digital Payments group creates meaningful digital payment experiences for consumers, merchants, issuers, and partners at ...

Omni Federal

Software Engineer

Saint Louis, MO · On-site

Software Engineer Location: St. Louis, MO Security Clearance: Active TS/SCI (or SCI eligibility) We question. We listen. We adapt. Be honest. Be pragmatic. Omni Federal, a Washington, DC-based ...

GardaWorld

Software Engineer

Saint Louis, MO · On-site

$100K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Software Engineer (Azure Cloud, Data Engineering & Automation) Hybrid - St. Louis, MO We are looking for a mid to senior Software Engineer to design, build, and operate backend services, data ...

MiTek USA Inc

Software Engineer

Chesterfield, MO · On-site +1

$85K - $140K/yr

  • Medical

  • Dental

  • Vision

  • Retirement

  • PTO

In this role, you will work closely with Software Engineering, Product Management, Quality Assurance, Architecture, and Customer-facing teams to deliver scalable, reliable software solutions that ...

MasterCard

Lead Software Engineer

O Fallon, MO

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Title and Summary Lead Software Engineer Overview Mastercard is seeking a Lead Software Engineer to serve as a technical leader and subject matter expert responsible for designing, developing, and ...

GardaWorld

Software Engineer

Saint Louis, MO · On-site +1

$100K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Software Engineer (Azure Cloud, Data Engineering & Automation) | Hybrid - St. Louis, MO We are looking for a mid to senior Software Engineer to design, build, and operate backend services, data ...

GardaWorld

Software Engineer

Saint Louis, MO · On-site +1

$100K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Software Engineer (Azure Cloud, Data Engineering & Automation) | Hybrid - St. Louis, MO We are looking for a mid to senior Software Engineer to design, build, and operate backend services, data ...

GardaWorld

Software Engineer

Saint Louis, MO · On-site +1

$100K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Software Engineer (Azure Cloud, Data Engineering & Automation) | Hybrid - St. Louis, MO We are looking for a mid to senior Software Engineer to design, build, and operate backend services, data ...

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 seeking a Lead Software Engineer to serve as a technical leader and subject matter expert responsible for designing, developing, and ...

DLS Engineering

Mid-level Software Engineer

Saint Louis, MO · On-site

$100K - $105K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Mid-level Software Engineer at DLS Engineering (on-site) DLS Engineering is seeking a Mid-level Software Engineer for a full-time position supporting a geospatial customer in St. Louis, Missouri.

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 We Are Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, we're helping build a ...

Mastercard, Inc.

Senior Software Engineer

O Fallon, MO · On-site

$114K - $151K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Title and Summary Senior Software Engineer Who We Are Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, we're helping build a ...

MasterCard

Software Engineer II

O Fallon, MO · On-site

$92K - $147K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

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

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Showing results 21-40

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.

Software Engineer

Boeing

Maryland Heights, MO • On-site

Full-time

Medical, Life, Retirement

Re-posted 14 days ago

Boeing rating

8.5

Company rating: 8.5 out of 10

Based on 613 frontline employees who took The Breakroom Quiz

33rd of 540 rated manufacturers

Job description

Software Engineer
Company:
Tapestry - G0G
Tapestry Solutions, A Boeing Company, brings over 30 years of industry experience designing, implementing, training, and supporting high-quality, cost-effective information technology and business intelligence solutions. With a dedicated team of approximately 500 professionals, we proudly serve 75 defense, commercial, and government clients across more than 50 U.S. locations and 9 countries worldwide.
As a trusted partner, our employees embody our core values by consistently delivering excellence, taking full ownership, and developing innovative solutions that enable critical missions and ensure the safety of our global customers and team members. Joining Tapestry Solutions means enjoying the best of both worlds: access to the vast resources of Boeing combined with the agility and people-focused, family-oriented culture of a small business where your contributions truly matter.
Tapestry Solutions, a part of Boeing Global Services BGS, is seeking a Software Engineer in Maryland Heights, MO to support future franchise programs.
This role involves software development for the next generation Mission Planning system for the Department of Defense. You will be a member of a software development scrum team and follow the SAFe Agile software development methodology to produce weapon planning software for the next generation Mission Planning system. The next generation system utilizes a microservices architecture and JavaScript and React for the front-end and primarily C# for the back-end services.
Position Responsibilities:
  • Supports the design, development, test, and maintenance of weapon planning software throughout the end-to-end lifecycle
  • Assists Product Owner to review, analyze, and translate customer requirements into initial design of software products
  • Supports with development, maintenance, enhancement and optimization of software products and functionalities for systems integrations
  • Support development, documentation and maintenance of architectures, requirements, algorithms, interfaces and designs for software products
  • Support with debugging and resolution of issues identified to ensure the reliability and efficiency of software products
  • Troubleshoot technical issues
  • Assists to develop, establish, monitor and improve software processes

Basic Qualifications (Required Skills/Experience):
  • Bachelor's Degree
  • Ability to obtain a U.S. Secret Clearance
  • 5+ years of software development experience to include use of languages such as JavaScript, TypeScript, React library, C# and/or C++
  • Experience with development and use of REST style APIs
  • Strong analytical and problem-solving skills
  • Excellent communication skills and experience collaborating with cross-functional teams including systems engineers, hardware engineers, and program managers
  • Experience with Agile software development methodologies and processes
  • Experience with Agile project tracking tools like Jira, Jira Align or Azure Devops
  • Experience with unit testing, integration testing, and system-level validation in complex software environments
  • Proficiency with version control and configuration management tools like Git, Azure Devops, or similar
  • Ability to document software designs, interface specifications, and test plans clearly

Preferred Qualifications (Desired Skills/Experience):
  • Bachelor of Science degree from an accredited course of study in engineering, engineering technology (includes manufacturing engineering technology), chemistry, physics, mathematics, data science, or computer science and 5+ years of related work experience OR Bachelor's Degree and 9+ years of directly related work experience OR 13+ years of related, relevant experience
  • 9+ years of software development experience to include use of languages such as JavaScript, TypeScript, React library, C# and/or C++
  • Prior experience working on defense, aerospace, or mission-critical software programs, preferably involving OMS or open architecture systems
  • Understanding of cybersecurity principles and secure coding practices relevant to mission systems
  • Experience with modular and open systems design: Ability to design, develop, and integrate modular software components that comply with open architecture principles
  • Experience integrating software components using standardized interfaces
  • Understanding of software architecture principles, design patterns, and best practices
  • Experience with .NET MAUI

Drug Free Workplace:
We are a Drug Free Workplace where post offer applicants and employees are subject to testing for marijuana, cocaine, opioids, amphetamines, PCP, and alcohol when criteria are met as outlined in our policies.
Pay & Benefits:
We strive to deliver a total rewards package that will attract, engage and retain the top talent. Elements of this package include competitive base pay and variable compensation opportunities.
We also provide eligible employees with an opportunity to enroll in a variety of benefit programs, generally including health insurance, flexible spending accounts, health savings accounts, retirement savings plans, life and disability insurance programs, and a number of programs that provide for both paid and unpaid time away from work.
The specific programs and options available to any given employee may vary depending on eligibility factors such as geographic location and date of hire.
Pay is based upon candidate experience and qualification, as well as market and business considerations.
Summary base pay range $105,000 - $128,140
Language Requirements:
Not Applicable
Education:
Bachelor's Degree or Equivalent
Relocation:
Relocation assistance is not a negotiable benefit for this position.
Export Control Requirement:
This position must meet U.S. export control compliance requirements. To meet U.S. export control compliance requirements, a "U.S. Person" as defined by 22 C.F.R. §120.62 is required. "U.S. Person" includes U.S. Citizen, U.S. National, lawful permanent resident, refugee, or asylee.
Safety Sensitive:
This is not a Safety Sensitive Position.
Security Clearance:
This position requires the ability to obtain a U.S. Security Clearance for which the U.S. Government requires U.S. Citizenship. An interim and/or final U.S. Secret Clearance Post-Start is required.
Visa Sponsorship:
Employer will not sponsor applicants for employment visa status.
Contingent Upon Award Program
This position is not contingent upon program award
Shift:
Shift 1 (United States of America)
Stay safe from recruitment fraud! The only way to apply for a position at Boeing is via our Careers website. Learn how to protect yourself from recruitment fraud - Recruitment Fraud Warning
Boeing is an Equal Opportunity Employer. Employment decisions are made without regard to race, color, religion, national origin, gender, sexual orientation, gender identity, age, physical or mental disability, genetic factors, military/veteran status or other characteristics protected by law.
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