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On Call Java Back End Developer Jobs in Chicago, IL

Nametag

Senior Backend Engineer

Chicago, IL

$120K - $190K/yr

Build internal tools and dashboards that improve operational visibility and developer workflows ... Strong experience with backend languages such as Node.js, Go, Python, Java, or similar.

Addison Group

Java Developer

Chicago, IL · On-site

$50 - $55/hr

Java Developer Industry: Information Technology / Software Development Location (City, State ... Develop and maintain backend applications utilizing Java and Spring Boot. * Design, build, and ...

PTR Global

App Dev - Java - Lead

Chicago, IL · On-site

$85 - $90/hr

We are seeking a skilled and experienced Back-End Engineer to join our team as a Lead in Application Development with expertise in Java. The ideal candidate will play a critical role in designing ...

Resource 1

Java Developer

Chicago, IL · On-site

$52.50 - $68/hr

Resource 1 is in need of a Java Developer for a long-term contract. This is hybrid/ remote, so ... and back-end (SQL). Individual should have experience with full life-cycle development, from ...

Luxoft

Senior Java with AI Experience

Chicago, IL · On-site

$59 - $75.25/hr

Write, review, debug, and optimize production code actively; lead through hands-on engineering contribution rather than delegation. * Build cloud-native backend services using Java, Spring Boot ...

Apex Informatics

Java Developer

Chicago, IL · On-site

$52.50 - $68/hr

Core Java Developer Work Location: Chicago, IL (Hybrid Role) Must have skills: AWS, Microservices ... Identify and address performance bottlenecks in both front-end and back-end components, ensuring ...

Socket.dev

Software Engineer (Back-End)

Chicago, IL · On-site

Design and build backend features and robust REST APIs on the Risk Cloud platform using Java, Kotlin, and Spring Boot--taking engineering tasks from requirements through implementation, testing, and ...

LogicGate

Software Engineer: Back-End

Chicago, IL · On-site +1

Design and build backend features and robust REST APIs on the Risk Cloud platform using Java, Kotlin, and Spring Boot-taking engineering tasks from requirements through implementation, testing, and ...

Apex Informatics

Java Developer

Chicago, IL · On-site

$52.50 - $68/hr

Identify and address performance bottlenecks in both front-end and back-end components, ensuring ... other developers to translate requirements into technical solutions. Participate in agile ...

Laksan Technologies

Java Fullstack Developer

Chicago, IL · On-site

$54 - $69.75/hr

Java Fullstack Developer Location: Chicago, Illinois Job Type: C2C Onsite Long-term We are looking ... The ideal candidate will have strong expertise in Java-based back-end development and React-based ...

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All JobsOn Call Java Back End Developer JobsOn Call Java Back End Developer Jobs in Chicago, IL

On Call Java Back End Developer information

See Chicago, IL salary details

$16

$58

$79

How much do on call java back end developer jobs pay per hour?

As of Sep 10, 2026, the average hourly pay for on call java back end developer in Chicago, IL is $58.41, according to ZipRecruiter salary data. Most workers in this role earn between $50.53 and $65.38 per hour, depending on experience, location, and employer.

What is the difference between On Call Java Back End Developer vs Java Software Engineer?

AspectOn Call Java Back End DeveloperJava Software Engineer
Primary RoleProvides on-demand backend support, troubleshooting, and quick fixes for Java applicationsDesigns, develops, and maintains Java-based software solutions
Work EnvironmentOften on-call, reactive, and support-focusedDevelopment-focused, project-oriented
Required SkillsJava, troubleshooting, problem-solving, quick responseJava, software design, coding, testing
CertificationsJava certifications beneficialJava certifications beneficial

While both roles require Java expertise and similar certifications, the On Call Java Back End Developer primarily handles urgent support and troubleshooting tasks, often working outside regular hours. In contrast, the Java Software Engineer focuses on designing and developing Java applications in a proactive manner. The roles differ mainly in their focus—reactive support versus proactive development—though they share core Java skills and certifications.

What are the most commonly searched types of Java Back End Developer jobs in Chicago, IL?

The most popular types of Java Back End Developer jobs in Chicago, IL are:

On Call Java Back End Developer jobs near you

Lead Software Engineer - Backend Engineering (Core) / Integrations

Chicago, IL • On-site, Remote

Ontrac Solutions
See more jobs at Ontrac Solutionsexternal

$100 - $110/hr

Contractor

Posted 6 days ago

Job description

OVERVIEW

We are seeking a Lead Software Engineer (Backend / Integrations) to anchor the backend workstream of a contractor program supporting a critical customer engagement: a state government professional licensing and regulatory compliance platform built on Google Cloud. This is a hands-on technical leadership role. The successful candidate owns the architecture of the core platform services and the external integration layer, sets the engineering standards the backend team works to, and remains in the codebase day to day. They will work closely with the client technical lead, the mobile and frontend engineers, and customer stakeholders to ensure project success from initial definition through final delivery.

Expected start date: 5 October 2026.

REQUIRED CREDENTIALS

10+ years of professional backend engineering experience with Java and Spring Boot

Demonstrated technical leadership of a backend team or workstream - setting architecture, reviewing code, and mentoring engineers - while still contributing production code

Production delivery experience on Google Cloud Platform, with ownership of a system through design, launch, and operation

Bachelor's degree in Computer Science or equivalent practical experience

REQUIRED QUALIFICATIONS

Java 21 and Spring Boot 3.x microservice development

Service and API design across a multi-service platform, including contract and versioning strategy

PostgreSQL, including schema design, indexing, and versioned migrations

GCP serverless services: Cloud Run, Pub/Sub, Cloud Tasks, Cloud Workflows, Cloud Scheduler

Event-driven architecture and messaging patterns (idempotency, retries, dead-letter handling)

External system integration over REST, SOAP, SFTP, and webhooks

API security with OAuth 2.0 / OIDC and JWT

Automated testing (JUnit, integration tests), CI/CD, and the quality standards that govern them

Working directly with non-engineering stakeholders to turn requirements into a delivery plan

USEFUL QUALIFICATIONS

Workflow engines (Flowable, BPMN) and business rules engines

AlloyDB, BigQuery

Payment processing integrations

Experience in government or regulated environments (FIPS, CJIS, HIPAA)

Google Cloud Professional certifications

Prior experience leading a distributed or contractor engineering team

SCOPE AND SOLUTION EXPECTATIONS

Below covers the scope of work we anticipate the contractor supporting throughout the project timeline.

Own the backend architecture: service boundaries, data model, event contracts, and the integration layer design

Design and implement Java 21 / Spring Boot microservices on Cloud Run (licensing, case management, payments, documents, notifications)

Implement PostgreSQL (AlloyDB) persistence, including row-level data isolation and search indexing

Build asynchronous event flows on Pub/Sub and Eventarc

Implement scheduled and timer-driven processing with Cloud Tasks and Cloud Scheduler (renewal reminders, expiration sweeps, reconciliation)

Author Cloud Workflows orchestrations for multi-service pipelines

Direct the build-out of integrations with external state and federal systems over REST, SOAP, SFTP, and webhooks

Oversee payment flows, including hosted payment page integration and settlement reconciliation

Own platform security and compliance outcomes for encryption and data isolation

Set and enforce test coverage, code review, and CI/CD standards across the backend team

Break down the backend scope, sequence the work, and report delivery status to the client technical lead and customer stakeholders

Mentor engineers on the team and support technical onboarding of new contractors

Employment Type: CONTRACTOR

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