103 applications developer jobs at 55 companies in Gillespie, IL

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Applications Developer
St. Louis, Missouri, United States
OnsiteFull Time
XTRA Lease
XTRA Lease: Rents and leases semi-trailers to the transportation industry.
3+ YOEBachelor's in CS or MIS; 3-5 years as a developer; .NET/C#, Angular, HTML5, CSS, SQL Server, WCF.
Microsoft .NET, C#, ASP.NET, Angular, HTML5, CSS, Microsoft SQL Server, WCF, Visual Studio, TFS
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Applications Engineer - Financial Systems
Kansas City or Atlanta or New York or Chicago or Los Angeles or Washington or Birmingham or Boston or Chattanooga or Charleston or Dallas or Denver or Edwardsville or Fort Lauderdale or Fort Worth or Houston or Jefferson City or Miami or Nashville or Park City or Philadelphia or Phoenix or Raleigh or Seattle or San Francisco or Salt Lake City or St. Joseph or St. Louis or Wilmington
$130k-$150k/yr RemoteFull Time
Polsinelli
Polsinelli: Am Law 100 law firm providing comprehensive legal services.
Experience supporting legal finance applications (Elite 3E or similar), strong SQL and BI skills, integrations, and cross-functional collaboration.
Elite 3E, Aderant Expert, Aderant Sierra, Bo​omi, BizTalk, SQL, Power BI, SSRS, Chrome River/Emburse, ClientPay/LawPay, ALP Imaging, Clocktimizer, Xcelerate, e-billing platforms, XML, CSV, APIs
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Applications Engineer I
St. Louis, Missouri, United States
OnsiteFull Time
Nidec
NidecTokyo Stock Exchange: 6594: Manufactures electric motors and electronic components for industrial applications.
0+ YOEBachelor's in Mechanical/Electrical Engineering, 0–2 years engineering experience (motor/manufacturing preferred), proficiency with Microsoft Office, ability to perform lab testing and safely use hand/power tools, limited quarterly travel.
Microsoft Office, bills of materials (BOMs), lab equipment, hand tools, power tools
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Product Applications Engineer - Switchgear
St. Louis, Missouri, United States
$95k/yr OnsiteFull Time
The Gund Company
The Gund Company: Manufactures custom electrical insulation and engineered material solutions.
1+ YOEB.S. in Engineering required, 1-3 years experience with switchgear or similar, ability to translate customer application needs, subject to ITAR requirements, 3-6 month training.
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Application Developer II
St. Louis, Missouri, United States
OnsiteFull Time
McCarthy Holdings
McCarthy Holdings: National construction specializing in commercial and industrial projects.
3+ YOE3+ years developing integrations and applications using iPaaS (Boomi/Mulesoft/Snaplogic), SQL, JSON/XML, modern stacks (.NET,C#/Node.js/TypeScript/Python/Ruby), DevSecOps practices and cloud platforms (AWS/Azure).
Boomi, Mulesoft, Snaplogic, SQL, JSON, XML, Palantir, .NET 6+, C#, Node.js, TypeScript, Python, Ruby, Ruby on Rails, Sinatra, ActiveRecord, CI/CD, DAST, SAST, SCA, Checkmarx, OWASP, GitHub, Snyk, Terrascan, Terraform, SFTP, PGP, AWS, Azure, Microsoft Office 365
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Application Developer II
St. Louis, Missouri, United States
OnsiteFull Time
McCarthy Building Companies
McCarthy Building Companies: Performs commercial construction and infrastructure development projects.
3+ YOE3+ years experience with enterprise iPaaS (Boomi/Mulesoft/Snaplogic), strong SQL and API integration skills, JSON/XML knowledge, application development on modern stacks (.NET6+/C#, Node.js/TypeScript, Python, Ruby), DevSecOps familiarity, cloud and container experience, Agile.
Boomi, Mulesoft, Snaplogic, Palantir, .NET 6+, C#, Node.js, TypeScript, Python, Ruby, Ruby on Rails, Sinatra, ActiveRecord, SQL, JSON, XML, CI/CD, DAST, SAST, SCA, Checkmarx, OWASP, GitHub, Snyk, Terrasan, Terraform, SFTP, PGP, AWS, Azure, Microsoft Office 365
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Geospatial Developer
Saint Louis or Belleville
OnsiteFull Time
NV5
NV5: Provides engineering, consulting, and geospatial solutions for infrastructure projects.
3+ YOEBachelor's in CS/Geography/GIS, 3+ years web application development, 1+ year ESRI geospatial app development, proficiency with HTML/HTML5/CSS/Python/JavaScript/.NET/JSON, ArcGIS Server, PostgreSQL/Oracle; U.S. citizenship and ability to obtain DoD clearance.
ESRI, Experience Builder, ESRI ArcGIS, ArcGIS Server, PostgreSQL, Oracle, HTML, HTML5, CSS, Python, JavaScript, .NET, JSON, AWS, Docker
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Geospatial Developer
Belleville or Saint Louis
OnsiteFull Time
NV5
NV5: Provides engineering, testing, inspection, and infrastructure consulting services.
3+ YOEBachelor's in CS/Geography/GIS, 3+ years web application development including 1+ year developing geospatial/ESRI apps; proficiency with HTML/HTML5/CSS, Python, JavaScript, .NET, JSON; experience with ArcGIS Server, PostgreSQL/Oracle; U.S. citizen eligible for DoD clearance.
Esri Experience Builder, ArcGIS Server, PostgreSQL, Oracle, HTML, HTML5, CSS, Python, JavaScript, .NET, JSON, AWS, Docker, REST, OGC, DevSecOps
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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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Agentic AI Developer
O'Fallon, Illinois, United States
$99k-$225k/yr HybridFull Time
Booz Allen Hamilton
Booz Allen HamiltonNYSE: BAH: Consulting and technology services for government and commercial clients
3+ YOE3+ years software development experience, Python, software design patterns, LLM application development, embeddings/vector DBs/semantic search, agent planning and AI safety knowledge, ability to obtain Secret clearance, Bachelor's degree.
Python, large language models, vector databases, Retrieval-Augmented Generation (RAG)
6d
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Senior Application Developer
Denver or Springfield or Sterling or St. Louis
$75k-$158k/yr OnsiteFull Time
CACI International
CACI InternationalNYSE: CACI: Provides information technology and engineering services for government agencies.
8+ YOEBachelor's in CS or related,8+ years software development experience,expert Java and/or Python,REST APIs,databases,CI/CD,GIT,TS/SCI clearance and polygraph willingness.
Java, Python, ArcGIS, GeoServer, OpenLayers, Cesium, Kubernetes, AWS/C2S, Git, CI/CD
5d
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Power Apps / QA Developer - Part Time
St. Louis or Fort Lee
RemotePart Time, Contract
Chameleon Integrated Services
Chameleon Integrated Services: Provides IT systems integration and cybersecurity for federal agencies.
4+ YOEActive Secret clearance; 4+ years in application development/Power Platform/QA; 2+ years developing Power Apps; Power Automate, Dataverse/SharePoint/SQL experience; testing, deployment, troubleshooting, and documentation skills.
Power Apps, Power Automate, Power BI, Azure, Microsoft 365, Dataverse, SharePoint, SQL, Azure Functions, APIs
3mo
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Software Developer
St. Louis, Missouri, United States
OnsiteFull Time
Bana Solutions
Bana Solutions: Provides software engineering, cybersecurity, and data solutions for government agencies.
4+ YOE5+ years in web applications; 2+ years cloud experience (AWS/Azure); modern web frameworks; HTML/JavaScript; Linux/Windows; OOP; performance; dev tools; agile; Bachelor's in CS or related field.
AWS, Azure, JavaScript, HTML, JQuery, Git, Gitlab, Jira, Linux, Windows, Node, Angular, React, Vue
3w
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Engineer IV, Client Products and Services Portfolio
St. Louis or Tempe
HybridFull Time
Edward Jones
Edward Jones: Offers investment management and financial planning through local branches.
5+ YOE5+ years web application development experience; proficiency with Spring, REST, React, JavaScript/jQuery, Thymeleaf, JPA, Kubernetes, JUnit, Selenium, SoapUI; familiarity with Kafka, MongoDB, Oracle DB, MS SQL, Linux; DevOps/CI/CD/Agile beneficial; tech lead and mentoring experience.
Spring, REST, React, JavaScript, jQuery, Thymeleaf, JPA, Kubernetes, JUnit, Selenium, SoapUI, Kafka, MongoDB, Oracle DB, Spring Boot, MS SQL, Linux, CI/CD, DevOps, Agile
3mo
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AI Developer (Entry Level)
Charlotte or Dallas or Jersey City or Pennington or St Louis or Georgia or Missouri or New Jersey or North Carolina
$68k-$74k/yr OnsiteFull Time
Wipro
WiproNYSE: WIT: Global technology services and consulting for digital transformation.
Recent STEM master's graduate preferred (3.0+ GPA); strong communication, analytical and problem-solving skills; ability to design, code, test, and document software; familiarity with programming, cloud applications, and GenAI concepts is a plus.
5d
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Software Engineer–Developer, Phantom Works Weapons (Associate or Experienced)
Saint Charles or Saint Louis
$99k-$171k/yr OnsiteFull Time
Boeing
BoeingNYSE: BA: Designs and manufactures aircraft, defense systems, and space technology.
1+ YOEAbility to obtain U.S. Secret clearance and U.S. Person status; Bachelor's degree or equivalent; 1+ years experience with C++, Python, C#, Linux, git; experience with software architecture and networked TCP/UDP applications.
C++, Python, C#, Linux, git
1w
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Associate Real Time Software Engineer, Phantom Works
Hazelwood or Cambridge or Mesa
$99k-$144k/yr HybridFull Time
Boeing
BoeingNYSE: BA: Designing and manufacturing commercial aircraft and defense systems.
3+ YOEBachelor's degree, ability to obtain U.S. Secret clearance,3+ years C/C++ and SDLC experience,1+ years real-time and safety/flight-critical development,EMR not applicable,ability to pass drug test.
C, C++, Python, Git, VX Works, DO-178C, MIL-HDBK-516C, MIL-STD-882E, CodeVue
2w
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Software II Developer
Saint Louis or Alabama or Kentucky or Oklahoma or Arkansas or Louisiana or South Carolina or Florida or Mississippi or Tennessee or Georgia or Texas or Indiana or North Carolina or Wisconsin or Iowa or Ohio
$76k-$124k/yr RemoteFull Time
BJC Health System
BJC Health System: Non-profit health system providing comprehensive hospital and clinical care.
3+ YOEDesign, develop, test and support integrations and applications using Cloverleaf, Tcl and healthcare messaging standards (HL7, X12, XML); 3+ years healthcare IT integration experience preferred; Bachelor's degree or equivalent.
Cloverleaf, Tcl, HL7, X12, XML, MQS, Epic, Bridges, Cogito, Onbase, SQL, Perl, Python, SFTP, VPN
2mo
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Epic Tapestry Application Developer
San Francisco or Milwaukee or Dallas or Columbus or Kirkland or Cincinnati or New York or Cleveland or Oklahoma City or Austin or Albany or Chicago or St. Petersburg or Hartford or Pittsburgh or St. Louis or Miami or Sacramento or Raleigh or Minneapolis or Mountain View or Scottsdale or Morristown or Denver or Boston or Philadelphia or Des Moines or Overland Park or Los Angeles or Charlotte or Walnut Creek or Carmel or Seattle or Houston or Arlington or Atlanta or Redmond or Bentonville or Beaverton or Nashville or Detroit or San Diego
$48-$58/hr OnsiteFull Time
Accenture
AccentureNYSE: ACN: Global provider of management consulting and technology services.
5+ YOE5+ years experience with healthcare EHR/Epic, Tapestry UM Epic certification required, strong Tapestry UM and Claims implementation experience, High School diploma/GED, strong interpersonal and clinical workflow skills.
Epic, Tapestry UM, EMR, EHR
2d
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Machine Learning Engineer II
Saint Charles, Missouri, United States
RemoteFull Time
Eurofins Scientific
Eurofins ScientificEuronext Paris: ERF: Global provider of analytical testing and laboratory services.
2+ YOEDegree in CS/data science/computational chemistry/bioinformatics, 2+ years building and deploying production AI-enabled applications, programming in Python and TypeScript, experience with FastAPI, React, Streamlit, LLM fine-tuning, cloud (Azure/AWS), containerization (Docker,Kubernetes), and domain knowledge in cheminformatics/bioinformatics. Must ...
Python, TypeScript, FastAPI, React, Streamlit, Azure, AWS, Docker, Kubernetes, Nextflow, PyTorch, LLM