Backend Developer Jobs in Illinois, United States

Device Communication Middleware Team builds cross‑platform solutions for monitoring and controlling manufactured devices. The Senior Backend Developer designs, codes, tests, and documents middleware using Node.js and TypeScript, exposing functionality via GraphQL and REST APIs while collaborating with marketing, test, and system engineering.

Staff Software Development Engineer responsible for designing, coding, and deploying Java backend services for CVS Retail Pharmacy systems. Leads architecture, collaborates with cross‑functional teams, ensures high performance, and mentors junior engineers.

Lead Payments Java Backend Developer at Wells Fargo. Join Global Payments and Liquidity Technology team in CCIBT.

CVS Health’s API Platform team builds a scalable, TypeScript‑based monorepo that powers hundreds of internal services and customer‑facing APIs. The Staff Engineer leads backend architecture, designs GraphQL APIs, and shapes reliability, observability, and security patterns across gateway integrations.

Agile Defense’s Backend Engineering team builds mission‑critical command and control services for the Mobility Air Force. The role designs, implements, and secures Java/.NET RESTful APIs and microservices in AWS GovCloud, while mentoring junior developers and driving DevSecOps pipelines.

Lead backend engineer at CVS Health building scalable NestJS services, driving technical vision, mentoring teams, and implementing best practices across distributed locations.

Senior Full Stack Developer at CNA Financial leads backend Java development, designs and integrates complex systems, mentors teams, coordinates with IT and clients, researches efficient architectures, and supports production implementation.

Senior Cloud-Native Back-End Developer at Medline Industries, leading design and implementation of scalable, resilient, high-performance applications for the e-commerce platform. Drives technical design decisions, mentors junior developers, embeds SRE best practices.

Backend Capability team at CVS Health drives the backend platform, API ecosystem, and third‑party integration layer for its SaaS health suite. The role defines API standards, steers a scalable event‑driven microservices architecture, and leads integration strategy with EHR/EMR systems and emerging AI model APIs.

We are FIS. Our technology powers the world’s economy and our teams bring innovation to life. This hybrid (3 days onsite) role in Chicago, Milwaukee, Atlanta, and Jacksonville requires a Senior Backend Software Engineer to lead technical design, provide high‑level estimates, prioritize features versus technical debt, and mentor engineers.

PayPal’s Credit Platform seeks a Backend Engineer to design, build, and maintain scalable services that power credit products such as Credit Cards, Buy Now Pay Later, and Merchant Loans. The role focuses on developing RESTful APIs and microservices in Java with Spring Boot, ensuring reliability, security, and performance in a regulated environment.

Principal Backend Engineer at Parts Town leads design and optimization of scalable microservices powering eCommerce and enterprise platforms. Drives backend architecture, ensuring seamless integration across commerce, CMS, ERP, PIM, and marketing systems.

Leidos’ Backend Engineering team builds mission‑driven systems that power a high‑visibility application for data analysis and operational decision‑making. The role designs and develops scalable Java or Python services, implements RESTful APIs, and optimizes SQL queries in a Linux environment.

FIS fintech role for Backend Engineer II. Hybrid 3 days onsite in Chicago, Milwaukee, Jacksonville. Lead high-quality software, mentor juniors, full-stack dev with Java, JavaScript, TypeScript, RESTful APIs, microservices, event-driven architecture.

Yourco builds an app-less employee communication platform that empowers frontline workers across traditional industries. As a Senior Backend Engineer you will design and implement scalable services using Node, MongoDB and PostgreSQL, collaborating with cross‑functional teams to deliver high‑impact features.

FIS is a leading fintech company seeking a Senior Backend Engineer to lead Java and Spring Boot–based services, APIs, and integrations across multiple U.S. locations. The role blends hands‑on development with technical leadership, driving design, code quality, and AI‑assisted engineering practices.

Senior Backend Engineer at CVS Health builds scalable microservices, APIs, and data pipelines for internal developer platforms using Java/Spring Boot and Python. Works on cloud-native services on AWS/Azure, containerized deployments, CI/CD, event-driven architectures with Kafka, SQS, RabbitMQ.

Senior Backend Engineer at FIS responsible for designing, developing, and maintaining scalable backend services in a hybrid environment across Chicago, Atlanta, Jacksonville, and Milwaukee. Lead high‑quality software delivery, mentor junior engineers, and collaborate with product, UX, and QA teams.

Globus Search & Insights at the University of Chicago builds a cloud‑based data management platform that powers scientific research worldwide. The Senior Software Engineer, Backend Services designs and implements scalable, secure data automation services, leading architecture, code reviews, and mentoring of junior engineers.

Backend Embedded Software Engineer at Caterpillar responsible for designing, implementing, and testing C++ middleware and data engine software on Linux-based Gen 7 displays. The role requires gathering user requirements, creating SRS documents, writing embedded C++ code, debugging with industry tools, and collaborating with cross‑functional teams.