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O'Fallon • 50 milesRemote · Hybrid · Onsite · Field · All Environments

O'Fallon • 50 milesRemote · Hybrid · Onsite · Field · All Environments

O'Fallon • 50 milesRemote · Hybrid · Onsite · Field · All Environments

O'Fallon • 50 milesRemote · Hybrid · Onsite · Field · All Environments

27 software engineer backend jobs at 12 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

Help us #BeatIndeed & #BeatLinkedIn

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

Help us #BeatIndeed & #BeatLinkedIn

1mo

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1mo

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

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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

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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

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2mo

Sr Software Engineer - Backend

Florissant, Missouri, United States

OnsiteFull Time

Augustine Institute

Augustine Institute: Provides Catholic theological education and media for faith formation.

Extensive experience with identity systems, AWS, Node.js/Nest.js, TypeScript, and secure, compliant cloud backend.

Nest.js, Node.js, TypeScript, AWS, Keycloak, nginx, Redis, ElastiCache, Upstash, Mux, Stripe

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3mo

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

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1mo

Geospatial Backend Developer – Multiple Positions at Junior/Mid/Senior Levels

Saint Louis or St. Charles or Virginia 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, bachelor’s in CS/Engineering/GIS/STEM, 2+ years backend engineering experience, Python/JavaScript/Node.js/Java, REST APIs, ArcGIS Enterprise, Docker/Kubernetes, cloud familiarity and strong collaboration skills.

Esri, ArcGIS Enterprise, ArcGIS Enterprise SDKs, Python, JavaScript, Node.js, Java, Docker, Kubernetes, Azure, AWS, GCP, PostgreSQL/PostGIS, SQL Server, REST

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Geospatial Backend Developer – Multiple Positions at Junior/Mid/Senior Levels

Springfield or Vienna or St. Louis

OnsiteFull Time

NV5

NV5: Provides engineering, testing, inspection, and infrastructure consulting services.

2+ YOERequires US citizenship and active Top Secret/SCI clearance, Bachelor’s in CS/Engineering/GIS or STEM, 2+ years backend experience, Python/Node.js/Java, ArcGIS Enterprise experience, containerization (Docker/Kubernetes), REST API design.

Esri, ArcGIS Enterprise, ArcGIS Enterprise SDKs, Python, JavaScript, Node.js, Java, REST APIs, Docker, Kubernetes, PostgreSQL, PostGIS, SQL Server, Azure, AWS, GCP

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1mo

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

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2mo

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2mo

Senior 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.

4+ YOESenior backend software engineer with 4+ years of experience building, deploying, and operating backend services and APIs on cloud, plus CI/CD and strong communication.

TypeScript, Node.js, Angular, SASS, PostgreSQL, Elasticsearch, AWS, Terraform, CI/CD, AI-assisted development tools

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3mo

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3mo

Software Engineer ||

O'Fallon, Missouri, United States

$92k-$147k/yr HybridFull Time

Mastercard

MastercardNYSE: MA: Global payment processing and financial technology service provider.

Hands-on full‑stack engineer; backend and frontend with Java, JavaScript, Angular, SQL; REST; Spring; secure coding and testing; Agile team contributor. Bachelor’s preferred.

Java, JavaScript, Angular, SQL, Spring, Spring Data JPA, REST, JUnit, Mockito, Jasmine

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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

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6d

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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3w

SDC Java Software Developer---Staff/Analyst---St. Louis (St. Louis, MO, US, 63105)

St. Louis, Missouri, United States

$55k-$113k/yr HybridFull Time

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

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1mo

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1mo

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

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1mo

API Engineer

Scott AFB, Illinois, United States

$87k-$198k/yr OnsiteFull Time

Booz Allen Hamilton

Booz Allen HamiltonNYSE: BAH: Provides technology and management consulting services to diverse organizations.

Backend/platform engineering with Java or Python, experience operating API gateways (Apigee, Kong, Mulesoft, AWS API Gateway), DevOps (Docker, Helm, Kubernetes, GitOps), cloud (AWS/Azure/GCP), Git/Jenkins/JIRA, and eligible for Secret clearance; HS diploma/GED required.

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

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