backend engineer jobs in Chicago

AfterQuery is looking for experts with experience in software engineering, computer science, or app/web development to help train and evaluate AI models. This is a remote, project-based role: qualify once through a single assessment and receive ongoing project matches spanning code review, evaluation, and original task creation. Pay ranges from $50 to...

Location: Remote (US); Central to Pacific time zones preferred Salary: $152,000 - $170,000 plus 10% bonus Sniffies is a location-based, interactive web app designed to help gay, bi, and curious individuals connect in a safe, judgment-free environment. Using an innovative map interface, users can discover nearby individuals and popular meetup spots and join...

Get to Know Us Horizon3 is a fast-growing, remote cybersecurity company dedicated to the mission of enabling organizations to proactively find and fix and verify exploitable attack vectors before criminals exploit them. Our flagship product, the NodeZeroTM platform, delivers production-safe autonomous pentests and other key assessment operations that scale...

About GMI GMI Cloud is a fast-growing, AI-native infrastructure company delivering high-performance GPU compute, inference services, and infrastructure for AI agents. Following 8x ARR growth, GMI Cloud continues to scale rapidly across the U.S. and APAC. As a Reference Platform NVIDIA Cloud Partner (NCP) and a validated leading NCP across both markets, we...

Alignerr Corp. is seeking a Back End Developer for a fully remote hourly contract in the United States. You will design, build, and optimize the server-side systems and APIs that power cutting-edge AI products—ranging from data pipelines and model-serving infrastructure to scalable microservices that handle real-world traffic at scale. This role emphasizes...

Earn Up To $50/hr as an OpenClaw Agent Builder Shape the future of autonomous agents like OpenClaw. Freelance, remote, up to $50 USD/hr. Weekly payments. Trusted by 10,000+ software engineers worldwide MIN EXP REQUIRED 2+ years PAY RATE Up to $50 USD/hr Earn Up To $50 USD/hr— Plus Additional Incentives Rates vary based on expertise and project...

Position’s Contributions to Work Group: As a Lead Software Engineer, you will be responsible for designing and developing backend RESTful API web services using Microservices architecture Typical task breakdown: · Lead the design and development of enterprise-scale REST APIs and microservices using Java 21+, Spring Boot, Apigee API Gateway, and AWS cloud...

About the Company Mango Voice is a leading provider of cloud-based communication solutions, helping businesses of all sizes connect with their customers through innovative VoIP, SMS, and collaboration tools. We are rapidly expanding our partner ecosystem and are looking for a driven individual to help build the technical evolution of our platform.About the...

Affirm is hiring for a senior backend engineer to join the AI Platform team. You will design and operate the gateway, runtime, and evaluation services that scale AI workloads for millions of users. You’ll work closely with security and infrastructure to enforce strong guardrails and ownership of platform health.The role emphasizes ownership, production...

Coinbase, Inc. is seeking a Senior Software Engineer, Backend to own and scale backend systems for institutional onboarding, KYC, provisioning, and access controls on the Client Lifecycle team within the Institutional group.You will partner with Compliance, Identity, and Prime product teams to ship onboarding for new products and maintain a robust...

Coinbase, Inc. is seeking a Staff Software Engineer for the FCM team to own the design and architecture of the core derivatives platform, spanning market data, order routing, settlement, and risk.This role will drive the next-gen replatforming, reduce legacy dependencies, and set engineering standards while mentoring team members to elevate code quality and...

The Java Developer III will support backend development initiatives focused on Spring Boot microservices within a baggage platform development environment. This role requires a hands-on developer with strong expertise in Java, cloud-native application development, event-driven architecture, and AWS technologies The ideal candidate will be a self-driven...

Alignerr Corp. is seeking a Back End Developer for a fully remote hourly contract in the United States. You will design, build, and optimize the server-side systems and APIs that power cutting-edge AI products—ranging from data pipelines and model-serving infrastructure to scalable microservices that handle real-world traffic at scale. This role emphasizes...

affirm is seeking a Senior Software Engineer to architect, build, and scale relational and distributed SQL databases in a remote-first environment. You will automate provisioning, backups, failover, and upgrades across multi-tenant clusters.The role emphasizes zero-downtime migrations, Kubernetes networking, and owning reliability-focused data operations...

***We are unable to sponsor as this is a permanent full-time role*** ***Hybrid, 3 days onsite, 2 days remote*** A highly regulated financial firm is looking for a Java Backend Engineer (Kafka, AWS, Testing). This engineer will need a experienced background using Core Java, AWS, Kafka, testing with Junit/SonarQube, and Kubernetes. Responsibilities: -...

Outlier helps the world’s most innovative companies improve their AI agents by providing human feedback. Do you want to shape the future of autonomous agents like OpenClaw? This is a freelance, remote role paying up to $50 USD/hr with weekly payments. Ideal candidates have 2+ years in backend engineering, AI automation, or complex systems integration and a...

Horizon3 AI is seeking a Senior Backend Engineer to strengthen the External Attack team. You’ll own core Python APIs, orchestration workflows, and data pipelines powering NodeZero’s external pentesting capabilities.Expect work across AWS data lakes, Kubernetes, and GraphQL services, with emphasis on observability and scalable production systems. You’ll...

Reddit is seeking a senior backend software engineer to help build app conversion signals that power Reddit’s app advertising business. You will work on MMP integrations, SKAN processing, and App CAPI to make app installs and in-app events more reliable for advertisers. Join a team focused on scalable ingestion, data lineage, and privacy-aware design,...

Stripe is seeking an experienced backend software engineer to design and build scalable products that power revenue operations for customers worldwide. You will contribute across technologies, collaborate with infrastructure, security, design, and operations, and ship features daily.Ideal candidates have 5–12+ years in backend or platform development, with...

Diversified Services Network, Inc. seeks a Lead Software Engineer to build backend microservices and REST APIs using Java 21+, Spring Boot, Apigee, and AWS. You will lead design, collaborate with product owners and architects, and deliver secure, scalable solutions for customers.Applicants should have 10+ years of experience and a Bachelor’s degree. The...