Software Engineering Jobs in O&#x27;Fallon, IL, US

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Software Engineering Manager (Software Engineering Mgmt)

Berkeley, Missouri, United States

$161k-$217k/yr OnsiteFull Time

BoeingNYSE: BA: Designing and manufacturing commercial aircraft and defense systems.

1+ YOE1+ MgmtLeadership experience; degree in engineering/science; real-time modeling/simulation or mission systems experience; knowledge of SAFe; experience leading software teams.

Scale Agile Framework (SAFe), Earned Value Management, Modeling and Simulation, Automation Testing Frameworks

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Manager, Software Engineering

O'Fallon, Missouri, United States

$140k-$231k/yr OnsiteFull Time

MastercardNYSE: MA: Global payment processing and financial technology service provider.

Software engineering manager with strong Java/Angular/Spring; hands-on leader; experience with scalable, secure apps; team leadership; Bachelor's in CS/Software Eng; Kafka/Splunk/Dynatrace preferred.

Java, Angular, PCF, Spring Boot, Oracle, Kafka, Splunk, Dynatrace

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Director, Software Engineering

St. Louis, Missouri, United States

HybridFull Time

mSupply: Distributes repair parts for appliances, HVAC, and plumbing systems.

5+ YOE5+ Mgmt5-10 years engineering management, 10+ years software dev/architecture, BS/MS in CS/Engineering, strong leadership, CI/CD, Azure, .NET, React, AI, ecommerce experience.

Microsoft .NET, React, Microsoft Azure, CI/CD, DevOps, Automated testing, AI tooling (Claude, Codex)

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Manager, Software Engineering

Fenton, Missouri, United States

HybridFull Time

UniGroup: Member-owned cooperative providing global moving and logistics services.

5+ YOE5+ years leading engineering teams; strong full-stack, cloud, microservices experience; ability to guide technical execution and mentor engineers.

Java, Spring Boot, React, React Native, PostgreSQL, Kafka, TypeScript, Node, GraphQL, Git, CI/CD, AWS, Docker, Kubernetes

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Software Engineering Senior Advisor - Hybrid

Morris Plains or Bloomington or Austin or Walnut Creek or St. Louis

$130k-$217k/yr HybridFull Time

The Cigna GroupNYSE: CI: Provides health insurance and pharmacy benefit management services.

10+ YOE10+ years in enterprise software or data engineering; strong SQL/ETL, cloud data pipelines; AWS/Snowflake/Databricks; healthcare industry experience; Agile; strong communication.

AWS, Snowflake, Databricks, Teradata, Python, SQL, ETL, Data Modeling, Cloud Platforms

1mo

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1mo

Software Engineering Lead

O'Fallon, Illinois, United States

OnsiteFull Time

Amyx: Management and technical solutions for federal government agencies

Secret clearance required; leads multi-team Agile; supports Agile ceremonies, backlog management, and documentation.

Jira, Confluence

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Embedded Software Engineering Senior Specialist - Cybersecurity

Mossville, Illinois, United States

$148k-$222k/yr OnsiteFull Time

CaterpillarNYSE: CAT: Manufactures construction equipment, mining machinery, and industrial engines.

Lead a cybersecurity-focused embedded software team; design, develop, test, and document cybersecurity features for Caterpillar embedded products.

Linux, Python, C/C++, Java, GIT, RTOS, CAN, J1939, Ethernet, Agile

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Software Engineering Intern (Time-Limited/Remote) - WashU IT

Clayton, Missouri, United States

RemoteFull Time

Washington University in St. Louis: Providing higher education and conducting advanced academic research.

No required degree or prior work experience; strong interest in software development and HPC; willingness to learn and follow best practices; ability to work in a remote setting.

Git, Python, C++, JavaScript, Docker, Singularity/Apptainer, APIs, Linux environments, PyTorch, scikit-learn, TensorFlow

2mo

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2mo

Senior Vice President, Software Engineering

O'Fallon, Missouri, United States

OnsiteFull Time

MastercardNYSE: MA: Global payments network providing electronic transaction processing services.

N/A

1mo

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1mo

Software Engineer

Chantilly or St. Louis or Gaithersburg or Denver

OnsiteFull Time

Reinventing Geospatial: Geospatial software and AI solutions for national security.

6+ YOESenior software engineer with 6+ years of experience; strong full-stack skills; cloud experience; DevSecOps focus; security clearance.

Python, Java, JavaScript, HTML, CSS, REST APIs, React, Angular, Vue.js, Node.js, Django, Flask, Docker, Kubernetes, AWS GovCloud, C2S, Azure, MySQL, PostgreSQL, SQL Server, Git, Jenkins, SonarQube, Nexus, Terraform, Keycloak, Vault, ArcGIS, OpenSearch, Elasticsearch

1mo

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1mo

Senior Software Engineer

Bridgeton, Missouri, United States

$92k-$164k/yr RemoteFull Time

UnitedHealth GroupNYSE: UNH: Provides health insurance and technology-enabled health care services.

10+ YOESenior Software Engineer with 10+ years software engineering experience, AWS, Microsoft technologies, and strong DevOps/AI tooling.

AWS, Microsoft Technologies, .NET, C#, Python, Java, Node.js, Golang, SQL, CI/CD, Git, Jenkins, JFrog, Sonar, NUnit

1mo

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1mo

Senior Software Engineer

Bridgeton, Missouri, United States

$92k-$164k/yr RemoteFull Time

UnitedHealth GroupNYSE: UNH: Sells health insurance and provides diversified healthcare services.

10+ YOEBachelor's in CS/Software Engineering; 10+ years software engineering; 5+ years in AWS and Microsoft technologies; strong programming skills.

AWS, .NET, C#, Java, Python, C++, SQL, REST API

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Software Engineer

Fenton, Missouri, United States

RemoteFull Time

Maritz: Provides business incentive, event, and loyalty management solutions.

8+ YOE8+ years in software engineering; strong Java/JEE/Spring/JavaScript/Node.js/TypeScript; REST APIs; SPA frameworks; SQL databases; CI/CD; Agile.

Java, JEE, Spring, JavaScript, Node.js, TypeScript, REST API, SQL, HTML, CSS, JSON, Docker, Maven, Gradle, Jenkins

1mo

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1mo

Senior Software Engineer - Real Time Product Engineering

St. Louis, Missouri, United States

HybridFull Time

London Stock Exchange GroupLondon Stock Exchange: LSEG: Provides financial market infrastructure and global data analytics services.

5+ YOEBachelor's degree in CS or related field; 5+ years software development; experience with C/C++; strong Agile/Scrum/DevOps knowledge; data structures/algorithms; Git; SQL; strong communication.

C#, C++, Git, SQL, Python, Docker, Kubernetes, AWS, Azure, Google Cloud

1mo

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1mo

Software Architect

Beavercreek or Huntsville or St. Louis or Dayton

OnsiteFull Time

Radiance Technologies: Engineering and technology solutions for defense and intelligence.

5+ YOE5+ years as software architect/engineer; Bachelor's in Computer Science or Computer Engineering; knowledge of Go, Java, C++, or Python; strong communication; US citizenship; eligibility for Top Secret clearance.

Golang, Java, C++, Python

1mo

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1mo

Field Engineering Manager, Public Sector

New York or San Francisco or Saint Louis or Washington

$274k-$342k/yr HybridFull Time

Scale AI: Provides data and infrastructure for training artificial intelligence models.

5+ YOE2+ Mgmt5+ years software engineering; 2+ years engineering management; Python/JavaScript; cloud platforms; DoD/USG constraints; TS/SCI clearance or ability to obtain.

Python, JavaScript, AWS, Azure, GCP, Docker, Kubernetes, Linux, ETL, Data integration

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Lead Software Engineer

O'Fallon, Missouri, United States

$140k-$231k/yr OnsiteFull Time

MastercardNYSE: MA: Global payment network facilitating electronic transactions and financial services.

Lead software development, design scalable services, drive architecture, mentor engineers, and contribute to hiring.

Java, Python, Ruby, Angular, Scala, Cloud Technologies, NoSQL, CI/CD, DevOps, Microservices

1mo

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1mo

SOFTWARE ARCHITECT

Dayton or Huntsville or St. Louis

OnsiteFull Time

Ignite Fueling Innovation: Provides professional services and technical solutions for federal agencies.

5+ YOE5+ years in software architecture/engineering; BS in CS/CE or related field; proficiency in Go, Java, C++, or Python; US citizenship; ability to obtain TS/SCI clearance.

Golang, Java, C++, Python

1mo

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1mo

Software Engineer - Aviation Displays

Olathe or St. Louis or Chandler

HybridFull Time

GarminNYSE: GRMN: Designs and manufactures GPS-enabled navigation and wearable technology products.

1+ YOEBachelor’s degree in CS/EE/Engineering or related field with 1 year experience; GPA ≥3.0; proficient in C/C++/C#; knowledge of software engineering tools.

Configuration management, Build systems, Debuggers, Emulators, Simulators, Logic analyzers, C, C++, C#

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Executive Director, Software Engineering Manager

Chesterfield, Missouri, United States

$127k-$189k/yr HybridFull Time

Reinsurance Group of AmericaNYSE: RGA: Provides global life and health reinsurance and risk solutions

10+ YOE2+ MgmtLead IT teams, manage complex projects, budget, and policies; 10+ years PM/IT; 2+ years leadership; 5+ years people management; BA/BS required; MA/MS and LOMA preferred.

C#, Agile, Content Management Systems, Imaging software, Budgeting software

1mo

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1mo

Senior Software Engineer

Bridgeton, Missouri, United States

$92k-$164k/yr RemoteFull Time

UnitedHealth GroupNYSE: UNH: Provides health insurance and technology-driven healthcare services.

10+ YOESenior software engineer with 10+ years of experience, strong full-stack and cloud skills (AWS), Microsoft technologies, and SQL development.

C#, Golang, Node.js, Java, Python, C++, .NET, REST API, AWS, SQL, CI/CD, Git, Jenkins, JFrog, Sonar, NUnit

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Software Engineer (TS/SCI)

St. Louis, Missouri, United States

$100k-$140k/yr OnsiteFull Time

LaunchCode: Nonprofit providing free tech education and job placement services.

4+ YOE4-5 years software engineering experience; TS/SCI clearance; Python/Java/JavaScript; Angular; Agile; collaboration; problem-solving.

Python, Java, JavaScript, Angular, Cloud platforms, CI/CD, DevOps, Geospatial tools

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Senior Software Engineer

St. Louis, Missouri, United States

OnsiteFull Time

EquifaxNew York Stock Exchange: EFX: Provides consumer credit reporting and data analytics services globally.

5+ YOE5+ years software engineering experience in Java/SpringBoot, TypeScript/JavaScript, cloud tech (GCP/AWS/Azure), microservices, CI/CD, and agile practices.

Java, SpringBoot, TypeScript, JavaScript, HTML, CSS, GCP, AWS, Azure, Terraform, Helm, Jenkins, Kubernetes, Docker, Angular, Git, Maven, Gradle, JUnit, Selenium, Airflow, BigQuery, Dataflow, PubSub, Bigtable, CI/CD, Git

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Lead Software Engineer

Saint Louis or Charlotte

HybridFull Time

Wells FargoNYSE: WFC: Global provider of banking, investment, and mortgage financial services.

5+ YOELead software engineer with 5+ years of .NET C# experience, 2+ years RESTful/SOAP web services, and ability to lead large technology initiatives.

.NET, C#, REST, SOAP, OpenShift, CI/CD, Generative AI

1mo

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1mo

Software Engineer, Senior (Hazelwood, MO, US, 63042)

Hazelwood, Missouri, United States

OnsiteFull Time

FlightSafety International: Professional aviation training and flight simulator manufacturing services.

7+ YOEDevelop software for simulator systems; real-time simulation; software design and integration; mentor and support engineers.

Azure DevOps, Visual Studio, Git, Python, Bash, PowerShell

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Senior Software Engineer, C++

St Louis, Missouri, United States

HybridFull Time

Exegy: Provides high-performance market data and trading infrastructure.

7+ YOESenior software engineer with 7+ years of multithreaded C++ experience; design, implement, and optimize ultra-low latency market data systems.

C++, Linux, Python, Scripting

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Associate Embedded Software Engineer

Hazelwood or Berkeley or Saint Louis

$99k-$135k/yr OnsiteFull Time

BoeingNYSE: BA: Manufactures commercial and military aircraft, satellites, and defense systems.

2+ YOE2+ years embedded systems/software experience; Bachelors in engineering/computer science; ability to obtain US security clearance; onsite in Hazelwood, MO.

C, C++, Linux, Docker, Kubernetes, JIRA, Git, GitLab, Ansible, Artifactory, UML, SysML, Cameo, MSOSA, Automated Testing

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Software Engineer III

St. Louis, Missouri, United States

OnsiteFull Time

Agile Defense: Provides IT modernization and cybersecurity for federal government agencies.

5+ YOEActive U.S. Top Secret/SCI clearance; 5+ years software development in VB.NET/C#.NET; SQL experience; unit testing; CompTIA Security+ or Computer Science degree.

VB.NET, C#.NET, SQL, xUnit, nUnit, MSTest, Windows, Azure DevOps, Jira, CI/CD, RESTful APIs, C++

1mo

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1mo

Junior Software Engineer

St. Louis, Missouri, United States

OnsiteFull Time

Freedom Technology Solutions Group: Provides geospatial and software engineering solutions for national security agencies.

0+ YOEActive TS/SCI clearance; 0-3 years software development; proficiency in Java, JavaScript, Python; experience with DevSecOps, Agile, CI/CD; AWS; Docker/Kubernetes; geospatial data processing; GIS tools; cross-functional collaboration.

Java, JavaScript, Python, Docker, Kubernetes, OpenShift, AWS, GitLab, Spark, Glue, ETL, PostGIS, GeoServer, ArcGIS, Parquet, JSON, XML, GitLab CI/CD

1mo

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1mo

Software Developer

O'Fallon, Missouri, United States

OnsiteFull Time

True Manufacturing: Manufactures commercial refrigerators, freezers, and ice machines.

5+ YOEFive+ years of related experience; Bachelor’s degree in Computer Science, Engineering, or related field or equivalent experience; strong SQL Server, SSIS, SSRS; ASP.NET, C#, HTML, JavaScript, CSS; WordPress; Experience with Shopify or other B2B eCommerce systems; API integration; knowledge of ERP/CRM is a plus.

Visual Studio, Azure DevOps, SQL Server, SSRS, SSIS, HTML, JavaScript, ASP.NET, C#, WordPress, Shopify, Node.js, .NET, CSS, APIs, Office 365, JD Edwards EnterpriseOne, ERP, CRM

2mo

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2mo

Senior Software Engineer

San Jose or Chicago or Philadelphia or Denver or Dallas or New York City or Century City or Garden City or Nashville or San Ramon or St. Louis or Bellevue or Woodland Hills or Irvine or Downtown Los Angeles or Boise or San Francisco or Austin or El Segundo

OnsiteFull Time

Armanino: Provides accounting, tax, auditing, and business consulting services.

5+ YOE5+ years of software development; strong TypeScript; 3+ years cloud (AWS/Azure/GCP); backend, NoSQL/SQL, React, Node.js; code reviews; mentoring; AI-enabled development.

TypeScript, React, Node.js, AWS, Azure, GCP, GraphQL, Infrastructure as Code, AWS CDK

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Software Engineer

Houston or Orlando or Phoenix or St. Louis or Nashville

$88k-$132k/yr HybridFull Time

Allsup: Provides Social Security disability and veterans benefits advocacy services.

2+ YOE2-5 years professional programming; experience with .NET and JavaScript; Scrum; estimate work; communicate clearly; document work.

C#, JavaScript, HTML, CSS, SQL, Web Services, React, Vue, Agile/Scrum, Umbraco, Salesforce, HubSpot

2mo

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2mo

Software Engineer

Edwardsville, Illinois, United States

OnsiteFull Time

Nevco: Manufactures digital scoreboards, video displays, and stadium audio systems.

Proficient in TypeScript/JavaScript, HTML/SCSS; strong Angular or React SPA experience; Node.js backend (NestJS/Express); Capacitator/Ionic/React Native; Redux/NGRX; NoSQL (MongoDB); Git; Jest/Cypress; able to work across full stack.

Angular, NestJS, Express, Capacitor, Ionic, React Native, NGRX, Redux, RxJS, MongoDB, Docker, AWS, Jest, Cypress, Jira

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Software Engineer

St. Louis or Dayton

HybridFull Time

Awetomaton: Develops software for satellite intelligence and geospatial data analysis.

3+ YOEBackend and API development with AWS exposure; 3+ years experience; MS preferred.

Python, Go, Java, Node, AWS, API Gateway, Lambda, ECS, DynamoDB, Kubernetes, React

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Software Development Engineer II- Back End

St. Louis or Redlands or Washington

$97k-$162k/yr OnsiteFull Time

Esri: Developing software for digital mapping and spatial data analysis.

2+ YOE2+ years backend software engineering; Python/JavaScript/Node.js and Java; REST APIs; ArcGIS Enterprise; containerized environments; geospatial data workflows; TS clearance; BS in CS/Math/GIS/STEM.

Python, Node.js, Java, ArcGIS Enterprise, Docker, Kubernetes, REST APIs

2mo

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2mo

Manager, Data Engineering

Chicago or St. Louis

$131k-$164k/yr HybridFull Time

Strata Decision TechnologyNYSE: ROP: Provides financial planning and analytics software for healthcare providers.

5+ YOE1+ Mgmt5+ years data/software engineering; 1-2+ years people management; strong SQL and Python; cloud data platforms; ETL architecture; leadership and collaboration skills.

Snowflake, AWS, Dagster, dbt, Python, SQL, CI/CD, Terraform, Kubernetes

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Senior Lead Embedded Software Engineer - Support Equipment

Saint Charles or Berkeley or Hazelwood or Saint Louis

$198k-$268k/yr OnsiteFull Time

BoeingNYSE: BA: Designs and manufactures aircraft, defense systems, and space technology.

14+ YOE6+ Mgmt15+ years embedded software experience, C/C++/C#/Python/Linux, Bachelor’s in engineering/computer science; leadership in software; U.S. security clearance eligibility; 5+ years with field service or military aircraft support equipment.

C, C++, C#, Python, Linux, Visual Studio, Git, Jira, NI tools

1mo

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1mo

Senior Software Engineer, Technology Solutions

St. Louis, Missouri, United States

OnsiteFull Time

NISA Investment Advisors: Provides customized investment strategies for institutional investors.

8+ YOE8+ years in enterprise software development; strong analytics/quantitative skills; Java/C# backend; JavaScript/TypeScript frontend; Salesforce/AWS experience; CI/CD; SQL; Databricks/WordPress a plus; financial services experience a plus.

Salesforce, AWS, Java, C#, Apex, JavaScript, TypeScript, SQL, SQL Server, Databricks, WordPress, CI/CD

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Principal Software Engineer-Agentic AI

St Louis or Houston or Raleigh

$115k-$192k/yr OnsiteFull Time

RELXLondon Stock Exchange: REL: Provides information-based analytics and decision tools for professional customers.

Agentic AI systems, LLMs, orchestration (LangChain/OpenAI), tool-augmented agents, prompt engineering, AI governance, scalable architectures.

LangChain, OpenAI APIs, vector databases, embeddings