Top Full-Stack Engineer Jobs in Chicago, IL

As a Fullstack Software Engineer, you'll design, develop, and maintain scalable frontend and backend systems while collaborating across teams.

Lead development of core client systems and engine-level infrastructure in Unity/C#. Diagnose and fix cross-cutting performance issues, upgrade third-party SDKs, evolve build tooling, produce design docs, scope multi-week infrastructure initiatives, mentor engineers, and drive profiling, optimization, and architecture changes to enable future features.

Responsible for leading a team of engineers, supporting product development, identifying technical issues, and ensuring high-quality code delivery in backend systems at scale.

Join as an early founding full-stack engineer to architect, build, and deploy a scalable platform serving AI-driven voice applications. You will own frontend and backend development, design infrastructure with the CTO, and deliver reliable production systems for enterprise customers.

Design, implement, and maintain scalable serverless backend services and responsive Next.js front-end components. Build data scrapers and integrations, improve CI/CD and IaC, mentor junior engineers, and collaborate with product and clients to solve complex compliance problems.

Lead full-stack engineering portfolio and mentor developers to deliver cloud-based, microservices-driven solutions. Collaborate with product managers, use modern languages and container orchestration, and drive regulatory-compliant systems and tech innovation.

Lead a portfolio and team to design and deliver cloud-based, full-stack, microservices solutions meeting regulatory needs. Mentor engineers, collaborate with product managers, occasionally code and evaluate implementations, and use modern cloud, container, database, and AI-related tooling.

Lead and mentor an engineering team to build cloud-native, full-stack solutions and distributed microservices. Collaborate with product managers to deliver secure, scalable AWS-based applications using modern languages, containers, and orchestration while promoting tech practices, experimentation, and community engagement.

Lead an agile engineering team to design, build, and operate secure, scalable full-stack systems. Drive architecture for event-driven microservices, develop Java Spring Boot services and React/TypeScript SPAs, own testing and operational stability, promote AI-assisted engineering practices, and lead technical evaluations and communities of practice.

Leads the architecture, development, testing, and delivery of secure, scalable cloud-native enterprise applications. Designs microservices, APIs, event-driven systems, and distributed applications using Java, Spring Boot, React, and related technologies. Partners with cross-functional teams, drives architecture and code-quality standards, implements automated testing and CI/CD practices, and mentors engineers. Evaluates emerging generative AI and LLM technologies for enterprise applications while promoting resiliency, observability, security, and high availability.

Build and own end-to-end full-stack features across backend services and user-facing applications. Contribute to system design, reliability, performance, observability, and engineering practices while collaborating with product and design.

Lead design and implementation of the PSA Liquidity Platform connecting buyers and sellers. Build buyer tooling, matching/ranking engines, and seller experiences. Architect and operate microservices and Kafka-driven systems on Kubernetes/AWS, instrument observability, apply AI tooling across the SDLC, and drive cross-functional delivery from 0-to-1 while owning end-to-end outcomes.

Design, build, and maintain cross-platform mobile applications and end-to-end web features. Implement front-end interfaces, back-end services and RESTful APIs, optimize databases, write tests and documentation, perform code reviews, and collaborate with UX, QA, and DevOps to deliver high-quality, secure, and performant solutions.

Design, build, and maintain production-grade .NET web applications and APIs on Azure. Own full-stack delivery from data models and SQL to front-end components, CI/CD, testing, and architecture. Collaborate with product and delivery teams, participate in code reviews, and ensure secure, observable, well-tested services.

Volunteer Principal Full Stack Engineer to lead and contribute across frontend and backend (React/React Native, Node.js, MongoDB). Own feature development, mentor engineers, collaborate with product/design, ship scalable code, and support CI processes. Must commit 4+ hours weekly and attend a weekly standup; first task includes launching a fundraising campaign.

Senior server-side engineer to develop and extend gameplay features and systems using PHP, work with relational and non-relational data stores, integrate new tools, and help define and scope work on high-profile live game titles.

Senior Full Stack Engineer for Grainger's Home Page and Display Customizations team. Build and maintain reusable React components, design and evolve backend services, improve observability and reliability, modernize legacy systems, and contribute to micro-frontend architecture. Mentor junior engineers, lead team projects, and collaborate with stakeholders to deliver high-quality customer-facing features.

The Full Stack Engineer will design, build, and maintain scalable web applications, impact customer onboarding and integrations, write and review code, and support technical improvements.

Build and maintain scalable full-stack features for Roo’s veterinary staffing marketplace. Develop across the React Native mobile app and backend services, contribute to architecture, write unit and end-to-end tests, resolve production issues, improve observability and reliability, and support CI/CD deployments. Collaborate cross-functionally with product, design, data, and engineering teams while mentoring junior engineers and driving technical improvements.

Build and own internal operational tools, client portals, dashboards, intake workflows, and responsive web experiences. The engineer will shape system architecture, scalability, user flows, and technical roadmaps while collaborating with leadership and an external development team. The role requires autonomous full-stack development, strong product judgment, clean interface design, and eventual ownership of the company’s database and internal systems.

Own full-stack modernization of complex federal legacy systems using Palantir as the target platform. Responsibilities include analyzing workflows, designing scalable applications, developing Java and Spring Boot backend services and APIs, building React-based user interfaces, integrating legacy environments, troubleshooting across application and data layers, and supporting the full SDLC. The role also requires stakeholder collaboration, code reviews, Agile delivery, and simplifying undocumented or inefficient processes.

Build and own CRM features and workflow automations supporting sales, marketing, onboarding, and support. Develop full-stack functionality using Next.js, FastAPI, Inngest, and related technologies; partner with teams to automate workflows; create agentic solutions for enrichment and task automation; and manage features from planning through monitoring and refinement. The role requires strong web development expertise, product sense, autonomy, communication, and experience with modern JavaScript or TypeScript frameworks and orchestration tools.

Own full-stack features for Techstars OS from data ingestion and APIs through React interfaces and production delivery. Build AI-native search, retrieval, and assistive workflows using founder and portfolio data. Lead migration and retirement of legacy tools, develop data pipelines, improve testing and CI/CD, and provide architectural guidance. The role requires strong autonomy, written communication, and end-to-end ownership across cloud infrastructure and product development.

Lead a four-week project to launch a production inventory table and artifact-detail experience for an AI security platform. Build frontend-heavy, data-dense workflows with large tables, filtering, paging, and resilient state management. Contribute across TypeScript, React, Next.js, Node.js, Postgres, REST APIs, and background jobs. Partner with technical and design leadership, review code, and potentially develop deduplication, reporting, and knowledge-graph features.

Build and ship end-to-end product features across an author analytics dashboard, marketing site, free tools, billing, email, and AI-assisted functionality. Design data models and APIs, integrate third-party services, develop production LLM features, and maintain testing, monitoring, performance, and observability. The role includes code review, technical documentation, independent product decisions, and close collaboration with the founder in a remote-first environment.