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402 system developer jobs at 156 companies in Saint Charles, MO

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System Engineer (Unix)
Scott AFB, Illinois, United States
OnsiteFull Time
By Light Professional IT Services
By Light Professional IT Services: Provides IT systems engineering and cybersecurity solutions for federal agencies.
10+ YOEInstall, configure, and maintain UNIX/Linux and Microsoft server environments; troubleshoot systems; support production infrastructure; participate in on-call rotations; active DoD Secret clearance required.
Microsoft Windows Server 2012/2016, Azure, AWS, Linux, LDAP, Kerberos, Active Directory, SAN, NAS, Splunk, Cisco, McAfee, Solaris
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1mo
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System Engineer- ArcGIS
St. Louis or Vienna
$121k-$198k/yr OnsiteFull Time
Esri
Esri: Developing software for digital mapping and spatial data analysis.
8+ YOE8+ years experience designing, implementing, and administering enterprise ArcGIS or comparable systems; US citizenship with active Top Secret/SCI clearance; Bachelor's in STEM; experience with Windows/Linux, scripting, RDBMS, and network concepts.
ArcGIS Enterprise, ArcGIS Desktop, ArcGIS Online, Portal for ArcGIS, ArcGIS Runtime, Python, PowerShell, JavaScript, C#, Windows, Linux, SQL Server, Oracle, PostgreSQL
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System Engineer (MBSE)
St. Louis, Missouri, United States
HybridFull Time
Agile Defense
Agile Defense: Provides IT modernization and cybersecurity for federal government agencies.
5+ YOE5+ years systems engineering experience, Secret clearance required to start, MBSE (Cameo), TFS/Azure DevOps, OFP SIL testing experience, ability to define requirements, perform trade studies, risk assessments, and V&V.
Model-Based Systems Engineering (MBSE), Cameo, Team Foundation Server, Azure DevOps, Operational Flight Program (OFP), System Integration Lab (SIL)
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2mo
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System Engineer
Springfield or Vienna or St. Louis
OnsiteFull Time
INCATech
INCATech: Geospatial technology services provider.
8+ YOE8+ years of professional experience; enterprise ArcGIS design/implementation; Windows/Linux admin; scripting languages; networking concepts; RDBMS SQL knowledge; BS in CS/GIS/STEM.
ArcGIS, Windows, Linux, PowerShell, Python, Javascript, C#, SQL Server, Oracle, PostgreSQL
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Clinical System Engineer I
Salt Lake City or Raleigh or Durham or St. Louis
$64k-$91k/yr HybridFull Time
bioMérieux
bioMérieuxEuronext Paris: BIM: Develops and manufactures in vitro diagnostic solutions for laboratories.
2+ YOEBachelor's in engineering/technology or equivalent experience, 2+ years troubleshooting mechanical/electrical systems, customer-facing problem resolution, networking aptitude, and MS Office proficiency.
Salesforce, Microsoft Outlook, Microsoft Teams, Microsoft Word, Microsoft Excel
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2w
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Clinical System Engineer I
Salt Lake City or Raleigh or Durham or St. Louis
$64k-$91k/yr HybridFull Time
bioMérieux
bioMérieuxEuronext Paris: BIM: Provides diagnostic solutions for infectious diseases and industrial microbiology.
2+ YOEBachelor's in engineering/technical field or equivalent experience,2+ years troubleshooting mechanical/electrical systems,customer-facing problem resolution,networking and MS Office proficiency.
Salesforce, ERP, Microsoft Outlook, Microsoft Teams, Microsoft Word, Microsoft Excel
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Sr. Application Developer - Legacy System Modernization
Bridgeton, Missouri, United States
OnsiteFull Time
Cass Information Systems
Cass Information SystemsNASDAQ: CASS: Provides invoice processing and payment services for large corporations.
5+ YOE5+ years application development experience, expert C#/.NET and COBOL legacy experience, Microsoft SQL Server, Azure DevOps/GitHub, CI/CD, AI-assisted development, and ability to modernize legacy systems.
C#, .NET, COBOL, SQL, Microsoft SQL Server, GitHub, GitHub Actions, Azure DevOps, HP NonStop, CI/CD
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Information System Security Engineer
Scott Air Force Base, Illinois, United States
OnsiteFull Time
CSCI Consulting
CSCI Consulting: IT and financial management consulting for government and commercial clients.
3+ YOEActive Secret clearance, 3+ years cybersecurity engineering experience, hands-on STIG/SCAP/Tenable experience, CEH and DoD 8140.03M DCWF Basic Tier certification required, strong documentation and communication skills.
STIG Viewer, SCAP Compliance Checker, Tenable Security Center, Tenable Cloud Security, CyberArk Privileged Access Management (PAM)
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Lead Mission System Flying Test Bed Engineer
Berkeley, Missouri, United States
$137k-$185k/yr OnsiteFull Time
Boeing
BoeingNYSE: BA: Designing and manufacturing commercial aircraft and defense systems.
9+ YOEBachelor's in engineering or related; 9+ years' related experience or equivalent; experience with flight test planning, avionics integration, MBSE/Cameo preferred; ability to obtain U.S. Secret security clearance and meet export-control U.S. Person requirement.
Model Based Systems Engineering (MBSE), Cameo, Agile/Scrum
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Senior Developer
Sunset Hills, Missouri, United States
RemoteFull Time
Grimco
Grimco: Manufacturer and distributor of signs and sign-making supplies.
5+ YOE5+ years professional software development, strong SQL and relational DB skills, experience building system integrations (APIs/EDI), ability to work with legacy code, clear communication, and security awareness.
SQL, RPG, IBM i, IBM Power Systems, EDI, X12, REST, JSON, APIs, ERP, Microsoft Azure, AWS
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Software Developer Engineer (Experienced or Senior)
Hazelwood or Berkeley or Saint Louis
$127k-$217k/yr OnsiteFull Time
Boeing
BoeingNYSE: BA: Designs and manufactures aircraft, defense systems, and space technology.
5+ YOEBachelor's degree, 5+ years full stack software development, ability to obtain U.S. security clearance (Secret), experience with mission/safety-critical systems, agile experience, strong problem solving and leadership skills.
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2w
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Full Stack Developer 729
St. Louis, Missouri, United States
OnsiteFull Time
Freedom Technology Solutions Group
Freedom Technology Solutions Group: Provides geospatial and software engineering solutions for national security agencies.
Active TS/SCI clearance, experience in software development/system integration, familiarity with AWS services, CI/CD, containerization, GitLab, Agile, and customer-facing technical communication.
S3, Lambda, SQS, SNS, ECS, ECR, EKS, API Gateway, Cloudwatch, KMS, GitLab CI/CD, GitLab, Docker, Podman, Kubernetes, Harbor, CloudFormation, CDK, Terraform, Linux, JavaScript, React, Angular, HTML5, CSS3, Auroa, PostgreSQL/PostGIS, Oracle, Redis, Memcache, Elasticache, GDAL/OGR, GitLab
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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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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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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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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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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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3w
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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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Solutions Engineer – Investment Management Technology
Arizona or Tempe or Missouri or St. Louis or United States
RemoteFull Time
Edward Jones
Edward Jones: Offers investment management and financial planning through local branches.
10+ YOE10+ years software engineering with full-stack expertise; system design for scalable, secure cloud solutions (microservices); experience with relational and non-relational databases, operating production systems (monitoring/observability), and automated testing.
Java, Kubernetes, MongoDB, SQL Server, Oracle, Kafka, Azure Cloud, React, Node, Python, AI, DB2, COBOL, MQ, Dynatrace, Grafana
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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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