28 backend java developer jobs at 15 companies in O'Fallon, IL

PromotedHiringCafe
Founding Backend / Infra Engineer
Cupertino, CA, US
$160k-$300k/yr On-SiteFull Time
HiringCafe
HiringCafe: Building a 100× better job search engine to take on Indeed and LinkedIn.
Own the crawlers, pipelines, and infrastructure powering a real-time job search engine. Strong Node.js and Python fundamentals; bonus points for security and reverse-engineering chops.
Node.js, Python, Elasticsearch, Redis
PromotedHiringCafe
Founding Full-stack / Product Engineer
Cupertino, CA, US
$130k-$300k/yr On-SiteFull Time
HiringCafe
HiringCafe: Building a 100× better job search engine to take on Indeed and LinkedIn.
Help us build a 100× better job search engine. We need a full-stack engineer with great taste, sharp fundamentals, and a track record of shipping polished product on React/Next.js plus a real backend (Firebase, Elasticsearch, Redis, Stripe).
React, Next.js, TypeScript, Firebase, Elasticsearch, Redis, Stripe
3mo
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Backend Developer SME
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.
14+ YOEActive TS/SCI clearance; 14+ years backend development; cloud-native; DevSecOps; leadership; experience with Python/Java/JavaScript; GitLab CI/CD; scalable distributed systems; client engagement.
Python, Java, JavaScript, Node.js, AWS, GitLab CI/CD, Docker, Kubernetes, APIs, CI/CD, Serverless, Geospatial, PostGIS
1mo
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Backend Software Developer
Springfield or Vienna or St. Louis
OnsiteFull Time
INCATech
INCATech: Geospatial software solutions provider focusing on GIS and enterprise data management.
2+ YOE2+ years backend development; Node.js, Python/Java; REST APIs; ArcGIS Enterprise; Docker/Kubernetes; on-site; Top Secret clearance.
Node.js, Python, Java, ArcGIS Enterprise, Docker, Kubernetes, REST APIs, PostgreSQL, PostGIS, SQL Server
4d
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BackEnd Software Engineer (Experienced or Senior)
Berkeley or Saint Louis
$127k-$217k/yr OnsiteFull Time
Boeing
BoeingNYSE: BA: Designing and manufacturing commercial aircraft and defense systems.
5+ YOERequires bachelor’s degree, active U.S. Secret clearance, 5+ years backend development experience with Java/Go/Python and SQL, experience with infrastructure, CI/CD, containerization, and Agile.
Java, Spring, Oracle SQL, SQL Server, PL/SQL, Go, Python, JavaScript, NodeJS, ReactJS, C++, GitLab, CI/CD, Docker, Kubernetes, Kafka, NiFi, Redis, RabbitMQ, AWS
4d
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BackEnd Software Engineer (Experienced or Senior)
Berkeley or Saint Louis
$127k-$217k/yr OnsiteFull Time
Boeing
BoeingNYSE: BA: Designs and manufactures aircraft, defense systems, and space technology.
5+ YOE5+ years backend development experience (Java, Go, Python), SQL/DB experience, bachelor’s degree, active U.S. Secret security clearance, Agile experience, CI/CD and containerization familiarity.
Java, Spring, Oracle SQL, SQL Server, PL/SQL, Go, Python, C++, GitLab, CI/CD, Docker, Kubernetes, JavaScript, NodeJS, ReactJS, Kafka, NiFi, Redis, RabbitMQ, AWS
1mo
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Geospatial Backend Developer – Multiple Positions at Junior/Mid/Senior Levels
Saint Louis or St. Charles or Virginia
OnsiteFull Time
NV5
NV5: Provides engineering, testing, inspection, and infrastructure consulting services.
2+ YOEUS citizen with active/current Top Secret/SCI, BS in CS/Engineering/GIS/STEM, 2+ years backend development, Python/Node.js/Java experience, ArcGIS Enterprise integration, containerization (Docker/Kubernetes), REST API design, cloud familiarity.
Python, JavaScript, Node.js, Java, ArcGIS Enterprise, ArcGIS Enterprise SDKs, Docker, Kubernetes, PostgreSQL, PostGIS, SQL Server, Azure, AWS, GCP
1mo
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Geospatial Backend Developer – Multiple Positions at Junior/Mid/Senior Levels
Springfield or Vienna or St. Louis or Sun Prairie
OnsiteFull Time
NV5
NV5: Provides engineering, consulting, and geospatial solutions for infrastructure projects.
2+ YOEUS citizen with active/current Top Secret/SCI clearance, Bachelor's in CS/Engineering/GIS/STEM, 2+ years backend development experience using Python/Node.js/Java, ArcGIS Enterprise experience, containerization (Docker/Kubernetes), REST API design, and cloud familiarity.
Esri, ArcGIS Enterprise, ArcGIS Enterprise SDKs, Python, Node.js, Java, Docker, Kubernetes, PostgreSQL, PostGIS, Microsoft SQL Server, Azure, AWS, GCP, REST
2mo
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Full Stack Developer (Backend Emphasis)
Scott AFB, Illinois, United States
$110k-$150k/yr HybridFull Time
Agile Defense
Agile Defense: Provides IT modernization and cybersecurity for federal government agencies.
5+ YOESenior full stack developer with 5+ years in Java/.NET, AWS GovCloud, REST APIs; DoD/federal experience preferred; ability to obtain security clearance.
Java, .NET, AWS (GovCloud), Lambda, ECS, EKS, Fargate, API Gateway, RDS, S3, CloudWatch, IAM, SQL, Linux, Docker, OpenAPI, Jenkins, GitHub Actions, GitLab CI, Python, Bash
1mo
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Software Development Engineer II- Back End
Redlands or St. Louis or Vienna
$97k-$162k/yr OnsiteFull Time
Esri
Esri: Developing software for digital mapping and spatial data analysis.
2+ YOE2+ years backend engineering experience; professional experience with Python, Node.js/JavaScript, and Java; experience with ArcGIS Enterprise, containerization (Docker/Kubernetes), API design, and Top Secret/SCI clearance required; Bachelor's in STEM.
Python, Node.js, Java, ArcGIS Enterprise, ArcGIS Enterprise SDKs, Docker, Kubernetes, Azure, AWS, GCP, PostgreSQL, PostGIS, SQL Server
3d
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Software Engineer 2 (Backend AI)
Earth City or Atlanta or Hopkins or Denver or Cincinnati or Brookfield or Irving
$98k-$116k/yr HybridFull Time
U.S. Bank
U.S. BankNYSE: USB: Provider of personal, business, and institutional financial services.
3+ YOE3+ years software engineering experience, BS or equivalent, experience with full-stack development, cloud-native and DevOps practices, AI/GenAI familiarity preferred, strong communication and problem-solving skills.
Java, Python, Spring Boot, FastAPI, Node.js, REST APIs, GraphQL, Microservices, Azure, AWS, Azure OpenAI, AWS Bedrock, LLM APIs, LangChain, LangGraph, Semantic Kernel, Docker, Kubernetes, CI/CD Pipelines, GitHub, GitHub Copilot, SQL Server, PostgreSQL, MongoDB, Vector Databases, Embedding Models, RAG
3w
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SDC Java Software Developer---Staff/Analyst---St. Louis (St. Louis, MO, US, 63105)
St. Louis, Missouri, United States
$55k-$113k/yr HybridFull Time
EY
EY: Global firm providing audit, tax, and professional consulting services.
1+ YOEBachelor's in CS or related, 1+ year software development experience, backend (Java/Python/Node.js), REST/APIs, cloud (AWS/Azure), microservices, frontend (React/Angular), CI/CD, Git, testing/TDD/BDD; willing to travel up to 50%.
Java, Python, Node.js, REST, NoSQL, Microservices, Serverless, AWS, Azure, React, Angular, Akka, Scala, Kafka, RabbitMQ, ElasticSearch, Hadoop, Spark, Flume, Mongo, Cassandra, Git, CI/CD, TDD, BDD, IaaS, PaaS
2w
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Software Developer - Meter Data Management Software (Full Stack, Back End)
Cedar Rapids or Lake Saint Louis or Mandan or United States
HybridFull Time
NISC
NISC: Provides enterprise software solutions for utility and broadband cooperatives.
1+ YOE1+ years software development; full-stack with back-end focus; experience with Databricks, Spark, AWS, Java/Scala/TypeScript, SQL/NoSQL, Docker/Kubernetes, CI/CD tools (JIRA, Confluence, Bitbucket, Bamboo); bachelor's preferred.
Databricks, Delta Lake, Spark, Kafka, Java, Springboot, Typescript, Angular, SQL, Scala, Scala Spark, Pyspark, S3, Lambda, EC2, EMR, SQS, SNS, CloudWatch, Oracle, Postgres, Cassandra, DynamoDB, Docker, Kubernetes, JIRA, Confluence, Bitbucket, Bamboo, CI/CD
1d
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Software Developer 2 (Associate)
O'Fallon, Illinois, United States
HybridFull Time
UNCOMN
UNCOMN: A technology delivering secure software solutions for public and private sector clients.
2+ YOE2+ years software development experience, backend/REST API experience, Java and Azure familiarity, Agile/Jira experience, eligible for U.S. Secret clearance, strong communication and problem-solving skills.
Java, Microsoft Azure, RESTful APIs, Jira
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
2w
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AWS Full Stack Engineer
Springfield or Reston or Arnold
$99k-$225k/yr OnsiteFull Time
Booz Allen Hamilton
Booz Allen HamiltonNYSE: BAH: Provides technology and management consulting services to diverse organizations.
5+ YOE5+ years full-stack and enterprise application development; 2+ years AWS and IaC experience; proficiency with React/Vue, backend languages (Java, Python, Go, C++), JavaScript/TypeScript, containerization, and cloud-native patterns; TS/SCI clearance required.
React, Vue, Java, Python, Go, SQL, C++, JavaScript, TypeScript, HTML, CSS, AWS, ECS, Lambda, SQS, SNS, EC2, RDS, DynamoDB, IAM, AWS CDK, Terraform, CloudFormation, Docker, Kubernetes, MongoDB, API Gateway
1mo
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API Engineer
Scott Air Force Base, Illinois, United States
$87k-$198k/yr HybridFull Time
Booz Allen Hamilton
Booz Allen HamiltonNYSE: BAH: Consulting and technology services for government and commercial clients
Experienced backend/platform engineer designing, deploying, and operating enterprise API platforms; Java or Python; Docker, Helm, Kubernetes, GitOps; API gateways and cloud (AWS/Azure/GCP); Secret clearance; HS diploma or GED.
Java, Python, Apigee, Gravitee, Kong, AWS API Gateway, Mulesoft, Docker, Helm, Kubernetes, GitOps, HTTP, gRPC, WebSockets, AWS, Azure, GCP, Git, Jenkins, JIRA, Confluence, Nexus, Bitbucket, SQL, Node.js, Groovy, Scala, Spring Cloud, Spring Core, Spring Boot, Spring Data, Kafka, RabbitMQ
1w
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Staff Software Engineer, Data
Creve Coeur or Chicago or Seattle or United States
$117k-$171k/yr HybridFull Time
Bayer
BayerFrankfurt Stock Exchange: BAYN: Global provider of healthcare medicines and agricultural products.
8+ YOE8+ years in software/data engineering, BS in CS or equivalent, expertise in backend languages (Python, Java), cloud-native and distributed systems, event-driven architectures, CI/CD, and building large-scale data platforms.
Kafka, Kinesis, Pub/Sub, SQS, SNS, JMS, Spark, Flink, Dataflow, Dataproc, Docker, GitLab Pipelines, GitHub Actions, AWS, GCP, Python, Java
2d
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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
1w
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API Engineer, Mid-Level
United States or Belleville
$100k-$150k/yr RemoteFull Time
MSM Technology
MSM Technology: Provides specialized IT infrastructure and cybersecurity services to federal agencies.
3+ YOEUS citizen with Secret clearance, HS diploma/GED, CompTIA Security+ and DOD 8570 IAT Level II, 3+ years backend/platform engineering with Java or Python, API platform and DevOps experience, and quarterly travel to Scott AFB.
Apigee, Gravitee, Kong, AWS API Gateway, Mulesoft, Docker, Helm, Kubernetes, GitOps, HTTP, gRPC, WebSockets, ZTNA, SDP, Java, Python, AWS, Azure, GCP, Git, Jenkins, JIRA, Confluence, Nexus, Bitbucket, Kafka, RabbitMQ, Node.js, Groovy, Scala, Spring Cloud, Spring Core, Spring-Boot, Spring Data

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