Backend Developer Jobs in Illinois, United States

Huntington Bank is seeking a Java Fuse Developer - IS Technical Specialist to help deliver Java-based, REST API-driven microservices aligned with the enterprise architecture roadmap. The role designs and implements complex, mission-critical IT solutions, serving as the primary technical owner for assigned projects while collaborating with cross-functional teams.

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.

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.

Quo is building an AI-powered platform to unify calls, texts, and customer data for small businesses. As a Senior Backend Engineer, you will code, architect, and own complex components while potentially leading small teams or projects.

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.

Tofu core engineering team builds the trust layer for internet hiring by combating AI‑generated fraud. As a Senior Backend Engineer you will develop fraud detection pipelines, design APIs linking detection models to product surfaces, and maintain data pipelines for real‑time signal ingestion.

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.

Capital One's Digital Engineering team builds cloud‑native financial platforms. As a Lead Software Engineer, you will guide a portfolio of microservice projects, mentor developers, and collaborate with product managers to deliver regulatory‑compliant solutions using Java, Python, Go, and AWS. Chicago, IL and McLean, VA; on‑site work model with occasional remote flexibility.

Global Operations at Stripe builds the financial decision-making infrastructure that powers merchants worldwide. The Backend Engineer will design and implement scalable APIs, distributed systems, and cloud services, collaborating with engineers, data scientists, and product managers to deliver new features.

Cat Digital, Caterpillar’s digital arm, builds industry-leading solutions for connected assets using data and AI. This Senior Software Engineer designs scalable cloud-native backend services on AWS using Java and Spring Boot. The role involves technical leadership, mentoring, and collaborating across teams to drive engineering excellence.

FleetWorks is building voice agents to modernize the fragmented U.S. freight booking marketplace. As a Senior Backend Software Engineer in Chicago, you will lead technical delivery for customer integrations, build core platform components, and shape internal tooling while working hands-on with users.

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.

Diversified Services Network, Inc. (DSN) in Chicago, IL is hiring a Lead Software Engineer to provide deep technical leadership for cloud-native Java systems on AWS. Day-to-day, you will design and implement backend services, define service architecture and integration patterns across microservices and event-driven systems, and guide AWS service adoption, CI/CD, and observability standards. This full-time hybrid role requires 3 days per week on-site in Chicago.

Device Provisioning and Management platform team at Motorola Solutions builds scalable services for secure device lifecycle on Google Cloud. The Senior Backend Java Engineer leads architecture, designs APIs, and mentors engineers while integrating advanced LLMs like Anthropic Claude for automated provisioning.

CenterWell (Humana) is building its AI engineering function from the ground up and seeks a Lead Full-Stack Engineer focused on backend and platform engineering. You will design and build the service layer connecting AI capabilities, data systems, and product frontends, setting standards for how services are built, secured, and operated across the team.

Engineering team at Prolaio builds a cloud‑based data platform for precision cardiology, enabling clinicians and researchers to improve heart disease outcomes. The Lead Software Quality Engineering, Backend role drives test automation, mentors a small team of automation engineers, and directly contributes code to maintain and scale test frameworks while ensuring data integrity and regulatory compliance.

Backend Engineering team at Photon Group builds scalable backend services and APIs for enterprise platforms. The role designs, develops, and maintains Java Spring Boot microservices, integrates event‑driven architectures with Kafka, and optimizes PostgreSQL data stores while collaborating with frontend, product, and QA teams.

Centerwell (Humana) is building its AI engineering function from the ground up and seeks a Senior Full Stack Engineer with a backend focus to design and build the platform and API layer connecting AI capabilities, data systems, and product frontends. Day-to-day work includes designing core backend services and REST/GraphQL APIs, embedding HIPAA-compliant security and PHI access controls, defining AI/LLM integration patterns, and contributing to full-stack feature delivery with TypeScript and Nex