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Contract Backend Developer Jobs in Illinois (NOW HIRING)

Senior API Integration Engineer

Chicago, IL · On-site

$126K - $166K/yr

The Overview We are seeking an experienced Sr. Integrations Engineer (Backend) to join our ... Work directly with external partners and internal teams to negotiate data contracts, troubleshoot ...

Node.js GraphQL TypeScript Developer

Chicago, IL · On-site

$52.75 - $68.25/hr

Senior Node.js GraphQL TypeScript Developer Location: Chicago, Bolingbrook, IL (Hybrid) Job Type ... Contract Immediate Joiners Preferred Must-Have Skills: 8+ years of backend development experience ...

Philippines, Latin America, or North America) Employment Type: Full-Time / Contract Company ... Backend Development * Develop and maintain APIs using Python and FastAPI. * Design scalable ...

Java Developer

Chicago, IL · On-site

$50 - $55/hr

Chicago, IL Assignment Type: 6+ Month Contract Pay: $50/hr-$55/hr Work Schedule: Hybrid Schedule ... Develop and maintain backend applications utilizing Java and Spring Boot. * Design, build, and ...

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 ...

This is a 6-month contract role for an early-career engineer who is ready to work across the stack ... React on the front end, Python/Ruby/Node on the back end, and SQL alongside a team of engineers ...

This is a 6-month contract role for an early-career engineer who is ready to work across the stack ... React on the front end, Python/Ruby/Node on the back end, and SQL alongside a team of engineers ...

This is a 6-month contract role for an early-career engineer who is ready to work across the stack ... React on the front end, Python/Ruby/Node on the back end, and SQL alongside a team of engineers ...

Senior Java Developer

Chicago, IL · On-site

$120 - $180/hr

Contract-W2/ FTE Summary: United's Digital Technology team designs, develops, and maintains ... Build cloud‑native backend services using Java, Spring Boot, Apache Camel, microservices ...

Showing results 41-60

Contract Backend Developer information

What are the key skills and qualifications needed to thrive as a contract backend developer, and why are they important?

To thrive as a Contract Backend Developer, you need strong programming skills in languages like Python, Java, or Node.js, along with experience in database management and API development, supported by a relevant degree or proven project experience. Familiarity with frameworks (such as Django, Spring, or Express), cloud services (like AWS or Azure), and version control systems (e.g., Git) is typically expected. Excellent problem-solving abilities, strong communication, and the ability to quickly adapt to new codebases and team environments set top contractors apart. These skills and qualities are crucial for delivering reliable, scalable backend solutions and integrating smoothly into diverse project teams.

What are some common challenges faced by contract backend developers when joining a new project?

Contract Backend Developers often encounter challenges such as quickly understanding existing codebases, adapting to different tech stacks, and aligning with the team's development practices. Since contract roles usually have tight deadlines, developers must rapidly familiarize themselves with project documentation and workflows. Effective communication with team members and proactive clarification of requirements are essential to ensure smooth integration and successful project outcomes.

What is a contract backend developer?

Contract backend developers are professionals hired on a temporary or project basis to build and maintain the server-side logic, databases, and APIs that power web or mobile applications. They work behind the scenes to ensure that applications function smoothly, handle data efficiently, and communicate effectively with front-end systems. Unlike full-time employees, contract backend developers typically work for a set duration or on specific projects, offering flexibility to both clients and developers. They often bring specialized expertise in programming languages such as Python, Java, Node.js, or Ruby, and may work remotely or on-site depending on the contract terms.
What are the most commonly searched types of Backend Developer jobs in Illinois? The most popular types of Backend Developer jobs in Illinois are:
What are popular job titles related to Contract Backend Developer jobs in Illinois? For Contract Backend Developer jobs in Illinois, the most frequently searched job titles are:
What job categories do people searching Contract Backend Developer jobs in Illinois look for? The top searched job categories for Contract Backend Developer jobs in Illinois are:
What cities in Illinois are hiring for Contract Backend Developer jobs? Cities in Illinois with the most Contract Backend Developer job openings:
Infographic showing various Contract Backend Developer job openings in Illinois as of August 2026, with employment types broken down into 59% Full Time, and 41% Contract. Highlights an 100% In-person job distribution.

Senior API Integration Engineer

Prolaio

Chicago, IL • On-site

$126K - $166K/yr

Other

Medical, Dental, Vision, Life, Retirement, PTO

Re-posted 16 days ago


Job description

Who Are We?

Prolaio believes that continuous learning and collaboration can make a significant difference in how heart care is administered. We are creating smarter ways to address heart disease and heart risks by integrating a connected platform enabled by smart data science to help patients access the care and attention that will inform better treatments and outcomes.

We envision a future where care teams and hospitals can be more effective, the healthcare system can be more efficient, and patients have a better care experience and more fulfilling lives.

This is precision cardiology, and we know it's within reach.

What Will You Do?

The Overview

We are seeking an experienced Sr. Integrations Engineer (Backend) to join our Integrations team. In this role, you will own the design, development, and maintenance of backend services that connect our platform to external healthcare systems, partner APIs, ERP systems, and analytics tools. You will be a key technical contributor on a small, high-impact team responsible for ensuring that clinical and operational data flows securely and reliably across our ecosystem.

This is a senior individual contributor role with real architectural influence. You will work closely with the Integrations Lead to shape technical direction, mentor teammates, and make decisions that directly affect how our platform connects to the broader healthcare landscape. You will also collaborate cross-functionally with our Cloud, Data, Mobile, and Web teams.

The Specifics

  • Integration Architecture: Design and implement integration patterns for connecting external healthcare systems, ERP platforms, and analytics tools to our internal services. You will own the technical approach for new partner integrations end-to-end
  • Backend Development: Build and maintain scalable backend services using Kotlin and/or Python, with a focus on reliability, security, and clean API contracts.
  • API Design & Collaboration: Design, document, and maintain RESTful APIs. Work directly with external partners and internal teams to negotiate data contracts, troubleshoot integration issues, and ensure interoperability.
  • Cloud & Containerization: Deploy and manage containerized services on Google Cloud Platform (GCP) or similar, using Docker/Kubernetes (k8s).
  • Data Pipeline & Warehouse Awareness: Collaborate with the Data Engineering team to ensure integrations feed cleanly into and from data pipelines, the data warehouse (BigQuery), and orchestration systems (Dagster). 
  • Monitoring & Reliability: Implement monitoring, logging, and alerting for cloud services using tools like Datadog, or similar. Own the reliability of the integration layer, when data stops flowing, you are the first responder
  • Security & Compliance: Ensure all integrations meet security best practices and regulatory requirements, particularly around sensitive healthcare data (SOC2, HIPAA, 21 CFR Part 11).
  • Mentorship: Support the growth of more junior engineers on the team through code review, pairing, and architectural guidance.

Why Prolaio?

  • Impactful Work: You will join in the fight to eradicate the world's #1 killer by extending and saving the lives of our patients while also being at the forefront of changing the healthcare industry through technology. 
  • Innovative Environment: You will be part of an organization doing something that's never been done before.
  • Professional Growth: You will join a growing team and have a substantial impact on our daily and future operations with the opportunity to continuously learn and grow.
  • Collaborative Team: You will be part of a team of collaborative, curious, and committed individuals focused on the collective good, inclusiveness, scientific excellence, and advancing digital health for cardiology.

Who You Are

Experience and Education

  • Bachelor's degree in Computer Science, Engineering, or a related technical field.
  • 5-7+ years of experience as a Backend Engineer, Software Integration Engineer, Cloud Software Engineer or similar role, with at least 2 years focused on system integrations or API-heavy environments.

Technical Skills and Practice

  • Backend Development: Strong proficiency in Kotlin and/or Python for building production-grade services and integrations.
  • Integration Patterns: Deep experience with integration architecture, RESTful APIs, webhooks, message queues, ETL/ELT patterns, and data transformation.
  • API Expertise: Experience designing, versioning, and securing APIs. Comfortable writing and maintaining API documentation. Familiar with authentication patterns.
  • Cloud & Containers: Hands-on experience deploying and managing services on Google Cloud Platform (GCP) or similar, using Docker/Kubernetes (k8s).
  • Databases: Comfortable working with both relational and NoSQL databases. Understands data modeling trade-offs in integration contexts.
  • CI/CD & Testing: Hands-on experience implementing and maintaining CI/CD pipelines, along with unit, integration, and regression tests
  • Monitoring and Debugging: Proficient with observability tools (Datadog, Prometheus, Grafana or similar). Able to diagnose issues in distributed systems across service boundaries.
  • Security & Compliance: Working knowledge of security best practices and compliance frameworks (SOC2, HIPAA). Experience handling PHI or PII is a strong plus.
  • Communication: Clear communicator who can explain technical decisions to non-technical stakeholders. Comfortable working directly with external partners.
  • Remote Work Ability: Proven ability to work effectively in a remote, distributed team across time zones.
  • Language Proficiency: Fluent in English.

Additional Qualifications (Nice to Haves)

  • Experience with healthcare data standards (HL7, FHIR, DICOM).
  • Familiarity with ERP integrations (NetSuite, SAP, or similar).
  • Experience with data orchestration tools (Dagster, Airflow, Prefect).
  • Prior experience in a healthcare or regulated industry (FDA, GxP).
  • Familiarity with reporting and analytics platforms (Superset, Looker, or similar).

Why You'll Love Working Here

  • Meaningful Compensation: Competitive salary, performance bonus, and equity so you can share in what we build.
  • Great Health Coverage: Medical, dental, and vision plans with multiple options and strong company contributions.
  • Flexible Spending Perks: HSA, FSA, commuter benefits, and a $1,200 annual Lifestyle Spending Account to support wellness, commuting, family needs, and more.
  • Time to Recharge: Generous paid time off, sick leave, and company holidays.
  • Family-First Benefits: Paid parental leave, caregiver leave, and support for growing families.
  • Security & Peace of Mind: Company-paid life insurance and short- and long-term disability coverage.
  • Plan for the Future: 401(k) plan to help you build long-term financial security.
  • Care When You Need It: Easy access to telehealth and optional supplemental coverage for life's unexpected moments.

Starting Salary is at $153,000.00 (Exact Compensation may vary based on skills, experience, and location)