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264 senior software engineer jobs at 99 companies in O'Fallon, MO

3mo
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Senior Software Engineer
O'Fallon, Missouri, United States
$115k-$184k/yr OnsiteFull Time
Mastercard
MastercardNYSE: MA: Global payment processing and financial technology service provider.
BS in Computer Science or related technical field; strong Java/Spring, Kafka, C++, JNI experience; software engineering best practices; leadership and problem solving; secure software development; willingness to mentor.
Java, Spring Boot, Kafka, C++, JNI
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2mo
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Software Engineer (Experienced, Senior)
Hazelwood, Missouri, United States
OnsiteFull Time
Boeing
BoeingNYSE: BA: Designs and manufactures aircraft, defense systems, and space technology.
5+ YOEExperienced senior software engineer with 5+ years C/C++, SDLC, and real-time embedded systems; eligible for security clearance.
C/C++, Python, C#, Assembly, Git, Jira, ClearCase, GreenHills Integrity
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1mo
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Senior Software Engineer
O'Fallon, Missouri, United States
$115k-$184k/yr OnsiteFull Time
Mastercard
MastercardNYSE: MA: Global payment network facilitating electronic transactions and financial services.
3+ YOEBachelor's degree or equivalent, 3+ years software engineering experience (financial services preferred); strong software engineering knowledge, secure solution delivery, SDLC experience, and strong communication and mentoring skills.
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2mo
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Sr. Software Engineer
Hazelwood, Missouri, United States
$82k-$115k/yr HybridFull Time
bioMérieux
bioMérieuxEuronext Paris: BIM: Develops and manufactures in vitro diagnostic solutions for laboratories.
7+ YOESenior-level software engineer with 7+ years full stack experience, AWS, IaC, microservices, and data governance.
AWS, Docker, Kubernetes, Terraform, CloudFormation, AWS CDK, Python, SQL, PostgreSQL, Oracle
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1w
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Senior Software Engineer
St. Louis, Missouri, United States
OnsiteFull Time
London Stock Exchange Group
London Stock Exchange GroupLondon Stock Exchange: LSEG: Provides financial market infrastructure and global data analytics services.
5+ YOE5+ years software development experience with C++/C#/ .NET, strong C++ fundamentals, Linux/Bash/Cron experience, cloud (Microsoft Azure/AWS/GCP), Git, CI/CD practices, and familiarity with AI-assisted coding tools.
C++, C#, .NET, Linux, Bash, Cron, Microsoft Azure, AWS, Google Cloud Platform (GCP), Git, GitHub Copilot, Microsoft Copilot, ChatGPT, Azure DevOps, GitHub Actions, Jenkins, AWS Lambda, Azure Functions, Docker, Kubernetes, Prometheus, Grafana, Datadog, Splunk, Microsoft Azure Monitor
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2mo
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FedNow Senior Software Engineer
Boston or St. Louis or Cleveland or Philadelphia or Chicago or San Francisco or New York or Kansas City or Atlanta or Minneapolis or Dallas or Richmond
$150k-$225k/yr OnsiteFull Time
Federal Reserve System
Federal Reserve System: The central bank of the United States.
8+ YOESenior Software Engineer with 8+ years Java, 3+ years AWS cloud, cloud-first architectures, CI/CD, DevOps, and serverless experience.
Java, JavaScript, XML, JSON, HTML, CSS, Python, Linux, Unix, Windows, SQL, Oracle, DB2, Cloud, AWS, Serverless, Terraform, CI/CD, DevOps, Kafka
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2mo
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Software Engineer (Experienced, Senior)
Hazelwood or Berkeley
OnsiteFull Time
Boeing
BoeingNYSE: BA: Designing and manufacturing commercial aircraft and defense systems.
5+ YOEBachelor's degree; 5+ years C/C++ and SDLC experience; real-time embedded software experience; Agile; active Secret Clearance preferred.
C/C++, Python, Git, Jira, ClearCase, DO-178C, GreenHills Integrity, MIL-HDBK-516C, MIL-STD-882E
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1w
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Software Engineer
St. Louis, Missouri, United States
$100k/yr HybridFull Time
GardaWorld
GardaWorld: Provides physical security, cash management, and integrated risk services.
5+ YOE5+ years software development with cloud/data engineering on Microsoft Azure, production ownership, Python/TypeScript, SQL/Snowflake, Terraform, Git, strong communication and problem-solving.
Microsoft Azure, Azure Functions, Python, TypeScript, Node.js, Snowflake, SQL Server, T-SQL, SQL, Terraform, Datadog, Git, Microsoft Graph, Checkov, Event Grid, Service Bus, VNet, OAuth 2.0, PGP, S/MIME
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Senior Mission Software Engineer, Public Sector
Austin or Honolulu or St. Louis or Washington
$186k-$279k/yr HybridFull Time
Scale AI
Scale AI: Provides data and infrastructure for training artificial intelligence models.
5+ YOE5+ years software engineering experience; strong Python and TypeScript; cloud (AWS/Azure/GCP), containers, Linux; active TS/SCI clearance; ability to operate in customer-facing, forward-deployed government environments.
Python, TypeScript, AWS, Azure, GCP, Node, React, Kubernetes, Docker, Terraform, Linux
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Software Engineer
Denver or St. Louis or Sterling or Springfield
$82k-$172k/yr OnsiteFull Time
CACI
CACINYSE: CACI: Provides information technology and professional services to government clients.
5+ YOEBachelor's in a technical field, TS/SCI with polygraph, 5+ years software development experience with Java and/or Python, web frameworks, relational/NoSQL databases, Agile experience, and secure coding practices.
Java, Python, ArcGIS, GeoServer, OpenLayers, Leaflet, Cesium, Docker, Kubernetes, CI/CD
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3w
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Hogan Senior Software Engineer
Hopkins or Cincinnati or Irving or Earth City
$120k-$141k/yr OnsiteFull Time
U.S. Bank
U.S. BankNYSE: USB: Provider of personal, business, and institutional financial services.
5+ YOE5+ years relevant experience, Bachelor's degree or equivalent, experience with Hogan systems and mainframe technologies, strong algorithms/data-structures and agile/DevOps familiarity.
Hogan DDA Application, Hogan process dictionary (PCD), CICS/VTAM, IMS/DB2, COBOL II, Easy Trieve, JCL, MVS, Expeditor, Gitlab, Microsoft Excel
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2mo
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Principal Software Engineer
Atlanta or Boston or Morristown or Plano or St. Louis or St. Petersburg or Hyderabad
HybridFull Time
Zelis
Zelis: Providing healthcare payment and claims cost management solutions.
8+ YOE8+ years backend software engineering; degree or equivalent; cloud, IaC, CI/CD; APIs; strong communication; leadership.
TypeScript, Node.js, PostgreSQL, Angular, AWS, Terraform, Elasticsearch, CI/CD, SASS
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1mo
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Sr. Engineer, Software - Archimedes
St. Louis or Brentwood or Alaska or Arizona or Arkansas or California or Connecticut or Delaware or Hawaii or Idaho or Louisiana or Maine or Massachusetts or Michigan or Mississippi or Montana or Nebraska or Nevada or New Mexico or New York or North Carolina or North Dakota or Oregon or Rhode Island or South Carolina or South Dakota or Texas or Utah or Vermont or Washington or West Virginia or Wyoming or United States
HybridFull Time
Navitus Health Solutions
Navitus Health Solutions: Transparent pharmacy benefit management and specialty pharmacy provider.
8+ YOEBachelor's in CS or related; 8+ years software engineering experience (5+ years with C#, .NET, React); experience with cloud-native, APIs, microservices, CI/CD, Git, Azure; technical leadership and mentoring experience.
C#, .NET, ASP.NET Core, React, TypeScript, JavaScript, REST APIs, GraphQL, Webhooks, API Management, Microsoft Azure App Services, Microsoft Azure Functions, Microsoft Azure Container Apps, Microsoft Azure Kubernetes Service (AKS), Microsoft Azure Storage, Microsoft Azure Databricks, Microsoft Azure Data Lake Storage Gen2, Microsoft Azure Synapse Analytics, Microsoft SQL Server, PostgreSQL, Microsoft Azure DevOps, GitHub Actions, CI/CD, Infrastructure as Code, Retrieval-Augmented Generation (RAG), Microsoft Azure OpenAI, Microsoft Azure AI Services, Intelligent Automation, Agent-Based Solutions, OWASP, OAuth2, OpenID Connect, DevSecOps, Git, Azure Repos, GitHub, TFS, Jira, Unix/Linux shell scripting
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2w
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Sr. Software Engineer
O'Fallon, Missouri, United States
$100k-$110k/yr OnsiteFull Time
Tech Mahindra
Tech MahindraNational Stock Exchange of India: TECHM: Global provider of information technology and business process services.
5+ YOEExpert in Java 8, Spring Boot, Microservices and Kafka; experience with Angular JS, testing frameworks (JUnit, Mockito), PCF or Azure; bachelor's degree and 5+ years software development experience.
Java 8, Spring Boot, Microservices, Kafka, Angular JS, JUnit, Mockito, PCF, Azure, Docker, Kubernetes, SQL, NoSQL
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1mo
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Senior Software Engineer - GoLang and Python
St. Louis or Missouri or Minnesota or Nebraska or Kansas or Iowa
$88k-$157k/yr OnsiteFull Time
CGI
CGINYSE: GIB: Provides information technology and business consulting services.
Extensive experience with Python and Go, API design (REST,gRPC), GKE/GCP, microservices, CI/CD, DevOps, IaC (Terraform), SQL, Git, observability, messaging (Kafka, Pub/Sub), and integrating AI/MCP into systems.
Python, GoLang, REST, gRPC, Google Kubernetes Engine, Google Cloud Platform, Model Context Protocol (MCP), Datadog, OpenTelemetry, SQL, Git, GitHub, GitLab, Terraform, Apache Kafka, Google Pubsub, AWS SNS/SQS, Istio
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1mo
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Senior Software Engineer
Arnold, Missouri, United States
OnsiteFull Time
GRVTY
GRVTY: Develops defense technology, cyber, and intelligence software solutions.
5+ YOEUS citizen with TS/SCI and CI polygraph ability; Bachelor's degree or equivalent and 5+ years' experience; CompTIA Security+ (IAT Level II) required; deep experience designing, deploying, and administering enterprise Microsoft Windows desktop environments using MECM/MCM, MDT, Intune and virtualization/app-virtualization tools.
Microsoft Windows, MECM, MCM, OSD, MDT, Intune, Microsoft Deployment Toolkit, Microsoft Endpoint Configuration Manager, Citrix XenApp, Citrix App Layering, Microsoft APPV, MSIX App Attach, VMware Dynamic Environment Manager, Active Directory, Group Policy Management, DFS, DNS, DHCP, Microsoft Azure, Office 365, Windows Server 2016, Windows Server 2019, PowerShell, ServiceNow, DISA STIGs
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Senior Software Engineer - ServiceNow/Javascript/API
St. Louis or Brentwood or Richmond Heights or Clayton or Maplewood
HybridFull Time
Enterprise Mobility
Enterprise Mobility: Provider of vehicle rental and diverse mobility solutions.
3+ YOE3+ years software development, 2+ years ServiceNow and JavaScript experience, API scripting (REST/SOAP), shell scripting (SSH/PowerShell), US work authorization, reside in St. Louis area, security-minded.
ServiceNow, JavaScript, REST, SOAP, SSH, PowerShell, Agile, Scrum
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1w
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Software Developer II - Connect Service Software (Front End, Billing Software)
Cedar Rapids or Lake Saint Louis or Mandan
HybridFull Time
NISC
NISC: Provides enterprise software solutions for utility and broadband cooperatives.
5+ YOE5+ years software development experience; proficiency with Angular/TypeScript, Java, RDBMS, automated testing, cloud and container technologies; bachelor's degree preferred.
Angular, TypeScript, Java, Postgres, Oracle, AWS, Kubernetes, Spring Boot, Kafka, Cassandra, Git, JIRA, Confluence, Bitbucket, Bamboo, generative AI
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1mo
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Embedded Software Engineer, Electronics Engineering
St. Louis, Missouri, United States
OnsiteFull Time
Nidec
NidecTokyo Stock Exchange: 6594: Manufactures electric motors and electronic components for industrial applications.
10+ YOE10+ years embedded systems experience with 7+ years in motor control; bachelor's in electrical/electronics engineering required; strong C/C++ firmware, MATLAB/Simulink, motor control algorithms, real-time and safety-critical embedded software skills.
MATLAB/Simulink, C/C++, Modbus, BACnet, UART, SPI, I2C, Bluetooth, Wi-Fi
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2mo
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Software Developer II - Meter Data Management Software (Full Stack, Databricks)
Cedar Rapids or Lake Saint Louis or Mandan
HybridFull Time
NISC
NISC: Develops enterprise software for energy and telecommunications cooperatives.
5+ YOE5+ years software development experience preferred; full-stack and data engineering experience; Databricks, Delta Lake, Spark, big data, AWS services, Java/Scala, Docker/Kubernetes, CI/CD, and strong analytical skills.
Databricks, Delta Lake, Apache Spark, Hadoop, Kafka, S3, Lambda, EC2, EMR, SQS, SNS, CloudWatch, Oracle, Postgres, Cassandra, DynamoDB, Java, Scala, Docker, Kubernetes, JIRA, Confluence, Bitbucket, Bamboo, Python, JavaScript, Bash, Angular, Spring Boot, SQL, MDM
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