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Senior Software Developer Jobs in St Louis, MO (NOW HIRING)

Eliassen Group

Senior Software Developer

Saint Louis, MO · On-site

$100 - $125/hr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

Louis, MO Our client seeks a Senior Software Developer to support modernization and maintenance of a mission-critical enterprise application in AWS for the U.S. Treasury. The role requires full-stack ...

Eliassen Group

Senior Software Developer

Saint Louis, MO · On-site

$100 - $125/hr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

Louis, MO Our client seeks a Senior Software Developer to support modernization and maintenance of a mission-critical enterprise application in AWS for the U.S. Treasury. The role requires full-stack ...

Apex Systems

Senior Software Developer I - Contractor

Saint Louis, MO · On-site

$51.75 - $68.25/hr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

Job#: 3040919 Sr. Software Developer - AWS/Java/Angular Quick Overview * Location: Hybrid (2-3 days onsite preferred) or remote for strong candidates * Duration: 12+ month contract (likely extension)

Rapsodo

Senior Software Developer

Saint Louis, MO · On-site

$53 - $70/hr

Powered by Athletes who get it, and Engineers who can do it. Role Purpose This role exists to be the connective tissue between cross-functional teams, translating complex system trade-offs into clear ...

Rapsodo

Senior Software Developer

Saint Louis, MO · On-site

$53 - $70/hr

Powered by Athletes who get it, and Engineers who can do it. Role Purpose This role exists to be the connective tissue between cross-functional teams, translating complex system trade-offs into clear ...

Rapsodo

Senior Software Developer

Saint Louis, MO · On-site

$53 - $70/hr

Powered by Athletes who get it, and Engineers who can do it. Role Purpose This role exists to be the connective tissue between cross-functional teams, translating complex system trade-offs into clear ...

Mastercard, Inc.

Senior Software Engineer

O Fallon, MO · On-site

$114K - $151K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

This role is for a Senior Software Engineer who will contribute to the design, development ... DevOps engineers, product owners, and program teams to understand requirements and deliver ...

MasterCard

Senior Software Engineer

O Fallon, MO · On-site

$114K - $151K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

This role is for a Senior Software Engineer who will contribute to the design, development ... DevOps engineers, product owners, and program teams to understand requirements and deliver ...

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 ... Experience with CI/CD pipelines and DevOps engineering practices. Knowledge of observability ...

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 ... CI/CD pipelines and DevOps engineering practices. • Knowledge of observability tooling ...

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 ...

Biomerieux

Sr. Software Engineer

Hazelwood, MO · On-site

$113K - $149K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

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 ...

TriOptus LLC

Senior Software Engineer - Java Developer

MO · On-site

$53.50 - $68.25/hr

Senior Software Engineer (Java Developer) Location: O'fallon, Missouri Duration: 24 months Experiece: 7+ years Skills summary: • Advanced in with Linux and Java development (JDK 1.7 or greater ...

bioMérieux

Sr. Software Engineer

Hazelwood, MO · On-site

$115K - $152K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

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

Sr. Software Engineer

Hazelwood, MO · On-site

$115K - $152K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

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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Senior Software Developer information

See St Louis, MO salary details

$14

$60

$85

How much do senior software developer jobs pay per hour?

As of Aug 13, 2026, the average hourly pay for senior software developer in St. Louis, MO is $60.02, according to ZipRecruiter salary data. Most workers in this role earn between $50.96 and $67.31 per hour, depending on experience, location, and employer.

What skills and qualifications are needed to thrive as a senior software developer?

To thrive as a Senior Software Developer, you need deep expertise in programming languages, software architecture, and problem-solving, typically backed by a bachelor’s degree in computer science or a related field. Proficiency with development frameworks, version control systems like Git, and cloud platforms such as AWS or Azure is standard, and certifications in these areas can be beneficial. Leadership, strong communication, and mentoring abilities set standout candidates apart in this role. These skills ensure that complex projects are delivered efficiently, code quality is maintained, and junior team members are effectively guided for overall team success.

What does a senior software developer do?

As a Senior Software Developer, you’ll typically be responsible for leading complex development projects, designing technical solutions, and mentoring junior team members. Daily tasks often include writing and reviewing code, participating in architecture discussions, collaborating with cross-functional teams (such as QA, product management, and DevOps), and troubleshooting high-level technical issues. You may also be involved in setting coding standards, conducting code reviews, and helping to plan sprints or project roadmaps.

What is a senior software developer?

Senior Software Developers are experienced professionals who design, develop, and maintain complex software applications. They often lead development teams, mentor junior developers, and make critical architectural decisions. Their responsibilities include writing high-quality code, troubleshooting technical issues, and ensuring that software projects meet performance and security standards. With deep expertise in programming languages and software engineering principles, they play a key role in delivering successful technology solutions for organizations.

What is the difference between Senior Software Developer vs Software Engineer?

AspectSenior Software DeveloperSoftware Engineer
CredentialsBachelor's degree in CS or related field; experience often 5+ yearsBachelor's or higher in CS or related field; similar experience levels
Work EnvironmentCollaborates on complex projects, mentors juniors, leads technical effortsDesigns, develops, tests software; may work on specific modules or systems
Industry UsageCommonly used in tech companies, startups, and enterprise firmsWidely used across industries, often interchangeable with developer roles

The main difference is that Senior Software Developers typically have more experience, leadership responsibilities, and focus on complex project oversight, while Software Engineers may focus more on designing and implementing software solutions. Both roles require similar credentials and are integral in software development teams, but Senior Software Developers often take on mentorship and strategic tasks.

More about Senior Software Developer jobs

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The most popular types of Software Developer jobs in St. Louis, MO are:

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For Senior Software Developer jobs in St. Louis, MO, the most frequently searched job titles are:

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Senior Software Developer jobs near you
Infographic showing various Senior Software Developer job openings in St. Louis, MO as of August 2026, with employment types broken down into 1% Internship, 86% Full Time, 10% Part Time, and 3% Contract. Highlights an 87% Physical, 4% Hybrid, and 9% Remote job distribution, with an average salary of $124,834 per year, or $60 per hour.

Senior Software Developer

Electronic Consulting Services, Inc (ECS Federal)

O Fallon, IL • On-site

$110K - $120K/yr

Other

Posted 2 days ago

New

Job description

Job Description
Everforth ECS is seeking a Senior Software Developer to work in our O'Fallon, IL office.
ECS Federal LLC is looking for a Senior Software Developer who possesses and applies expertise on multiple complex work assignments. The ECS Team provides development and support of GATES, a mission-critical application providing cargo and passenger manifesting and in transit visibility requirements for the DoD. We are seeking a Java Developer with experience developing Web applications to be part of the larger team. Assignments may be broad in nature, requiring originality and innovation in determining how to accomplish tasks. Operates with appreciable latitude in developing methodology and presenting solutions to problems. Contributes to deliverables and performance metrics. As a Senior Software Developer, the selected individual will work hands-on with developer and systems administrators to integrate our solutions and products for our government customer. Key responsibilities are to deliver DevSecOps pipeline solutions and proof of concepts for Continuous Integration/Configuration, Continuous Development, Continuous Delivery/Deployment, Continuous Testing, Continuous Security and Continuous Monitoring. The DevSecOps Engineer is also responsible for driving solutions that meet the customers' technical, financial and business requirements, and supporting a legacy system in the process of being modernized while being hosted in the cloud utilizing DevSecOps processes.
Salary Range: $110,000 - $120,000
General Description of Benefits
Required Skills
  • Bachelor's Degree
  • Java, HTML5 technologies, Angular, Spring, RHEL, SQL, Oracle RDBMS, JavaScript, XML, Agile methodologies, WebLogic, Tomcat, Gradle/Maven/Ant, Python
  • Experience with DevSecOps pipeline
  • Secret Clearance
  • Security + Certification or the ability to obtain immediately following employment.

Desired Skills
  • Knowledge of DoD transportation data and business practices
  • Ability to Design, Code and Test requirements using:
    • Linux and Windows operating systems
    • Server technologies like WebLogic, Tomcat and Apache
    • Container technologies like Docker, Kubernetes
  • Version control systems like Git
  • Build and deployment orchestration tools like Jenkins and K8s
  • Build and package managers like Gradle and Artifactory
  • Scripting languages such as Python, BASH, Perl, Powershell
  • Configuration Management tools like Ansible, Puppet, Chef, Terraform
  • Testing tools/frameworks like Junit, Selenium, Cucumber or Cypress
  • Static code analysis tools like SonarQube and Fortify
  • Log analytics tools like Splunk
  • Experience writing with Angular or React JS
  • Experience writing Java, JavaScript, and SQL or PL/SQL
  • Experience developing Infrastructure as Code (IaC) and Configuration as Code (CaC)
  • Familiar with Agile development methodology with an understanding of Kanban, SCRUM and SAFe principle, and DevOps/DevSecOps processes and methods
  • Support troubleshooting and diagnostics in both the development and production environments
  • Strong understanding of test-driven development and test automation to ensure adequate test coverage (unit, integration, system, load, functional and exploratory)
  • Able to work with the development manager and lead architect on architecture changes and understanding process and application design including grooming requirements in the architecture that were not provided in detail or not fully defined
  • Ability to manage workloads and the creation of program specifications from which the developers work and add them to the work tracker adding flowcharts, class diagrams, Entity Relationship Diagrams (ERDs), and a variety of other visual techniques (mockups) to clearly convey the meaning to the developer.
  • Able to work with development manager to manage backlogs, estimates and other SDLC requirements for development, provide estimates on requirements for iteration/build planning, and Integrate and deploy software in a complex architecture
  • Able to review code, perform code reviews and code check-ins to ensure the integrity of commits, builds, etc.
  • Ability to learn, understand and refine the capabilities of other developers on the team including ability to mentor and coach intermediate and junior developers with constructive code reviews and code theory discussions
  • Good oral and written communications skills to report progress, challenges, blockers, and risks that require escalation to the development manager

ECS Federal LLC is an equal opportunity employer and does not discriminate or allow discrimination on the basis any characteristic protected by law. All qualified applicants will receive consideration for employment without regard to disability, status as a protected veteran or any other status protected by applicable federal, state, or local jurisdiction law.
Everforth ECS is the federal segment of Everforth , a $4B global organization with over 10,000 employees. Our nearly 3,500 professionals deliver advanced technology solutions in data and AI, cybersecurity, and enterprise transformation, serving defense, intelligence, and federal civilian agencies.
Our work powers mission-critical outcomes, strengthens technology partnerships, and creates meaningful opportunities for our people. We are defined by a commitment to excellence in delivery, a culture of innovation, and an environment where talent can thrive and grow.
We value:
  • Attracting and developing top talent and high-performing teams
  • Fostering a culture that is engaging, accountable, and mission-driven

Meet the challenge. Make a difference with Everforth ECS!
#EverforthECS1

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