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79 software systems engineer jobs at 39 companies in Saint Charles, MO

3w
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Mid Systems Engineer
Denver or St. Louis or Sterling or Springfield
$69k-$142k/yr OnsiteFull Time
CACI
CACINYSE: CACI: Provides information technology and professional services to government clients.
4+ YOETS/SCI required, bachelor in engineering/CS or equivalent, 4+ years systems engineering on software-intensive systems, requirements analysis, interface documentation, V&V, Agile experience, ability to work onsite at a government facility.
SAFe, MBSE
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2mo
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Missions Systems Software Engineer - Embedded (Associate, Experienced, Senior)
Berkeley, Missouri, United States
OnsiteFull Time
Boeing
BoeingNYSE: BA: Designing and manufacturing commercial aircraft and defense systems.
2+ YOEEmbedded software engineer with 2+ years of programming experience in Go, Java, C/C++, Rust, or Python; experience in systems integration, CI/CD, and agile development; strong communication and teamwork.
Go, Java, C/C++, Rust, Python, CI/CD, Linux, VxWorks, Git, DevSecOps, Embedded Systems, C, Containers, Cameo
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2d
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Software Engineer
Hazelwood, Missouri, United States
OnsiteFull Time
FlightSafety International
FlightSafety International: Professional aviation training and flight simulator manufacturing services.
2+ YOEBachelor's in CS/CE/Applied Math,2+ years software engineering experience,proficiency in C#,system-level debugging,strong math/geometry skills,ability to obtain U.S. person/export eligibility and possibly security clearance.
C#, Microsoft Visual Studio, MATLAB, PowerShell
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4d
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F-15 Mission Systems Software Engineer (Associate, Experienced, & Senior)
Berkeley, Missouri, United States
$99k-$217k/yr OnsiteFull Time
Boeing
BoeingNYSE: BA: Designs and manufactures commercial airplanes, defense systems, and space technology.
Bachelor's in engineering or related field, ability to obtain U.S. Secret clearance/U.S. Person status, 2+ years with C/C++/C#/Python/Java/Ada and object-oriented development, experience designing architectures and embedded real-time software, Agile and DevOps exposure.
C, C++, C#, Python, Java, Ada, GitLab, Git Bash, Gradle, Jira, Jenkins, Artifactory, RTOS, Agile, SAFe
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1mo
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Missions Systems Software Engineer - Embedded (Associate, Experienced, Senior)
Berkeley, Missouri, United States
$99k-$217k/yr OnsiteFull Time
Boeing
BoeingNYSE: BA: Designs and manufactures aircraft, defense systems, and space technology.
2+ YOE2+ years programming with Go, Java, C/C++, Rust, or Python; systems integration experience; ability to obtain U.S. security clearance (U.S. citizenship required); strong verbal/written and teaming skills.
Go, Java, C++, Rust, Python, Linux, VxWorks, Containers, Git, CI/CD, DevSecOps, Cameo
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1mo
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Systems Integration Testing Engineer
St Louis, Missouri, United States
$112k-$179k/yr OnsiteFull Time
Peraton
Peraton: Provides advanced technology and mission support for government agencies.
6+ YOEMust hold Top Secret clearance and be willing to upgrade to TS/SCI with polygraph. BS in systems/electrical/physics/software engineering (or related) with 8 years' systems engineering experience (6 years with Master's). Experience in sensor imaging systems, test design, data verification, and strong written/oral communication required.
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1mo
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Systems/Controls Engineer II
Kirkwood, Missouri, United States
OnsiteFull Time
Bausch + Lomb
Bausch + LombNYSE: BLCO: Manufacturing and selling contact lenses and eye health products.
3+ YOEBachelor's degree in engineering or computer science (or equivalent experience), 3+ years engineering experience with software emphasis, software V&V and regression testing experience, ability to author and review SRS/SDS/SAD/test protocols, strong communication and organizational skills.
Microsoft Office, Aras PLM, D2, C/C++, C#, Python
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2w
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Software Engineer I
St. Louis, Missouri, United States
OnsiteFull Time
Nidec
NidecTokyo Stock Exchange: 6594: Manufactures electric motors and electronic components for industrial applications.
0+ YOEBS in EE/Software Engineering/Computer Science,0–3 years experience in desktop or embedded development,proficiency with C/C++,C#,Visual Basic,SQL,Java,IDE experience,embedded systems and hardware testing.
C, C++, C#, Visual Basic, SQL, Java, Microsoft Visual Studio
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2w
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Systems Engineer- St. Louis, MO or Solon, OH
St. Louis or Solon
OnsiteFull Time
Hubbell
HubbellNYSE: HUBB: Designs and manufactures electrical products and utility infrastructure solutions.
5+ YOEBachelor's in EE/CE/CS/Systems Engineering,5+ years system analysis/design experience, RF communications and hardware/software development experience,ability to write specifications and collaborate cross-functionally.
Microsoft Excel
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1w
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Staff Software Engineer
St. Louis or Burlington
$111k-$166k/yr HybridFull Time
Merck
MerckXETRA: MRK: A science and technology providing healthcare, life science, and electronics solutions.
3+ YOEBachelor's in CS/Engineering/Data Science, 3+ years in ML/data/search systems, strong Python, backend and data engineering experience, SQL, cloud (GCP/AWS), and production ML/LLM system design.
Python, REST API, Pandas, NumPy, MLFlow, TensorFlow, PyTorch, Scikit-learn, AWS Services, GCP, Kubernetes, Bedrock, Kafka, LangGraph, LangChain, AirFlow, Qdrant, Docker, Git, CI/CD, SQL
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1mo
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Lead Software Engineer
O'Fallon, Missouri, United States
$140k-$231k/yr OnsiteFull Time
Mastercard
MastercardNYSE: MA: Global payment processing and financial technology service provider.
Strong backend engineering with Java and Spring Boot, Oracle/SQL experience, MCP servers and AI-assisted development tool familiarity, distributed systems, testing, secure coding, microservices, observability, and mentoring experience.
Java, Spring Boot, Oracle, SQL, MCP servers, GitHub Copilot, Claude, Gemini, Sterling Connect: Direct, SFTP, MQ, Kubernetes, Docker
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3w
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Principal Engineer - Systems
St. Louis, Missouri, United States
RemoteFull Time
Enterprise Mobility
Enterprise Mobility: Provider of vehicle rental and diverse mobility solutions.
11+ YOE11+ years software and infrastructure engineering experience, expertise in cloud (Azure), security (MFA, SSO, MIM, OTP), distributed systems, and strong stakeholder communication and mentoring skills.
Microsoft Active Directory, Microsoft Entra, AppSec, MFA, SSO, MIM, OTP, Azure
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1w
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Software Developer III - DEW/Electrical Engineering Software (C#, Big Data)
Cedar Rapids or Lake Saint Louis or Mandan or Blacksburg
HybridFull Time
NISC
NISC: Provides enterprise software solutions for utility and broadband cooperatives.
8+ YOE8+ years software development experience; proficiency in C#/C++ and data-intensive/distributed systems; experience with databases, Git, and Atlassian toolchain; BS in CS preferred.
C#, C++, Java, PostgreSQL, SQL, Oracle, Git, Jira, Confluence, Bitbucket, Bamboo, Kubernetes, Docker, AWS, Spring Boot, Big Data, Microservices, Agile, Scrum
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2w
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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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3w
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Software Engineer IV – ERP Finance (Oracle/PLSQL)
Saint Louis, Missouri, United States
HybridFull Time
Charter Communications
Charter CommunicationsNASDAQ: CHTR: Provides broadband connectivity, cable, and mobile communication services.
2+ YOE2+ years Oracle and PL/SQL experience; ERP/financial systems development, software lifecycle knowledge, cloud/native and API familiarity, strong communication and problem-solving skills.
Oracle, PL/SQL, Java, Spring, API Gateway, AWS
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2w
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Software Engineer - Full Stack
St. Louis, Missouri, United States
$110k-$115k/yr OnsiteFull Time
LaunchCode
LaunchCode: Nonprofit providing free tech education and job placement services.
5+ YOE5+ years experience building and maintaining production systems; strong Postgres SQL skills; backend language proficiency (Golang preferred; Java/C#/C++/Python valued); front-end experience with Angular, HTML/CSS/JavaScript/TypeScript; cloud and security familiarity.
Angular, Golang, Java, C#, C++, Python, Postgres, Google Cloud, AWS, Azure, Git, Bitbucket, Node, HTML, CSS, JavaScript, TypeScript
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2w
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Software Linux Engineer - Installation and Packaging
Santa Clara or Westford or St. Louis or Boulder or New York
$152k-$288k/yr OnsiteFull Time
NVIDIA
NVIDIANASDAQ: NVDA: Designs GPU-accelerated computing and artificial intelligence hardware.
4+ YOEBachelor's or equivalent, 4+ years Linux system-level software development, experience with package management, repository and release automation, Python or Bash scripting, CI/CD and kernel/driver familiarity.
dpkg, RPM, yum, apt, zypper, Nix, NixOS, Python, Bash, CI/CD, Docker, Kubernetes
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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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2w
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Mid Software Engineer (SFA)
Saint Louis, Missouri, United States
OnsiteFull Time
Kentro
Kentro: Provider of digital and IT services for federal agencies.
5+ YOE5-7 years software development experience; proficiency in Python/Java/C#/Javascript; experience translating requirements, design, testing, deployment, database design, code reviews, and system integration. Active TS/SCI clearance and US citizenship required.
Python, Java, C#, Javascript
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2mo
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Senior Software Engineer - News Engineering (Elasticsearch)
New York or St. Louis
$114k-$190k/yr HybridFull Time
London Stock Exchange Group
London Stock Exchange GroupLondon Stock Exchange: LSEG: Provides financial market infrastructure and global data analytics services.
Strong experience with Java and Python on Linux; real-time systems; IP-based protocols; unit testing; Elasticsearch; cloud infrastructure; container orchestration; strong problem-solving and independent communication.
Java, Python, Linux, Elasticsearch, Kubernetes, Terraform, GitLab CI/CD, GitHub Copilot
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