Senior Full Stack Software Engineer Jobs in Crete, IL

Required Skills:
Core Technical Competencies:
Backend Development (Java/Spring Boot)
The ideal candidate must possess expert-level proficiency in Java (version 11+) with deep hands-on experience building production-grade applications using Spring Boot. This includes designing and implementing microservice architectures with proper service decomposition, inter-service communication patterns, and distributed system principles. The developer should demonstrate strong command of Spring ecosystem components including Spring batch, Spring data, Spring Security, Spring Cloud etc.
Frontend Development (React)
Strong proficiency in ReactJS is essential, including modern React patterns such as hooks, context API, and functional components. The candidate should have experience with state management solutions (Redux, Zustand, or React Query), component library development, and building responsive, accessible user interfaces. Familiarity with TypeScript in React applications, modern CSS approaches (CSS-in-JS, Tailwind, or SCSS modules), and frontend build tooling (Webpack, Vite) is expected.
Architecture & System Design
The candidate must demonstrate the ability to design scalable, resilient, and maintainable system architectures. This includes experience with microservice design patterns (API Gateway, Circuit Breaker, Service Discovery, Event Sourcing, CQRS), domain-driven design principles, and the ability to make pragmatic trade-off decisions. They should be comfortable creating architecture diagrams, technical specifications, and leading design discussions with cross-functional teams.
Test Automation (Playwright)
Hands-on experience with Playwright for end-to-end test automation is mandatory. The candidate must demonstrate proficiency in writing robust, maintainable automated tests for web applications, including cross-browser testing, API testing, and visual regression testing.
Cloud & Infrastructure (AWS)
Hands-on experience working with Amazon Web Services is mandatory, specifically with the following technologies:
Compute & Orchestration:
Amazon EKS (Elastic Kubernetes Service) for container orchestration, including deployment strategies, pod management, and cluster configuration.
PostgreSQL Amazon S3 for object storage, and Amazon ElastiCache (Redis) for caching layers and session management.
Supporting Services: Experience with additional AWS services such as IAM, CloudWatch, Secrets Manager, SQS/SNS, and API Gateway is highly valued.
Development Velocity & Modern Practices
AI-Assisted Development: The candidate must be proficient in leveraging AI code assistant tools (such as GitHub Copilot, Amazon CodeWhisperer, or similar) to accelerate development velocity while maintaining code quality and security standards. They should understand how to effectively prompt, review, and refine AI-generated code.
Rapid Contribution:
Demonstrated ability to onboard quickly, understand existing codebases, and deliver meaningful contributions within short timeframes. The developer should be comfortable working in fast-paced environments with evolving requirements.
Engineering Excellence:
Strong foundation in software engineering best practices including test-driven development, CI/CD pipelines, code review processes, and documentation standards.
Communication & Collaboration
Excellent verbal and written communication skills are essential. The candidate must be able to articulate complex technical concepts to both technical and non-technical stakeholders, participate actively in agile ceremonies, mentor junior developers, and collaborate effectively with product managers, designers, and business partners. Experience working in distributed or cross-functional teams is preferred.
Nice to Have
Financial Industry Experience: Prior experience working in banking, capital markets, asset management, or fintech environments is a significant advantage. Familiarity with financial regulations, trading systems, payment processing, or risk management platforms would be particularly valuable.
Job Description:
Concourse is seeking a talented and driven Senior Full Stack Developer to join our dynamic engineering team. This is an exciting opportunity to work on cutting-edge technology solutions, contribute to meaningful projects, and play a pivotal role in shaping the technical direction of our platform.
As a Senior Full Stack Developer, candidate will be responsible for designing, developing, and delivering high-quality software solutions across the entire technology stack. You will work closely with product managers, architects, and fellow engineers to build scalable microservices and intuitive user interfaces that drive business value. This role requires a hands-on technologist who thrives in a collaborative environment and can translate complex requirements into elegant, maintainable solutions.
We are seeking a candidate who combines deep technical expertise with strong interpersonal skills. The ideal person is a self-starter who takes ownership of their work, proactively identifies problems and solutions, and delivers results with minimal supervision. You should be passionate about building quality software, eager to learn and grow, and committed to fostering a positive, inclusive team culture.
Job Requirements
JOB UPDATE 06/05/2026
Role Overview
* Join the Concourse application team supporting a large-scale payment platform at J.P. Morgan.
* Contribute across the full software development lifecycle including design, development, testing, deployment, troubleshooting, and production support.
* Expected to work independently with minimal handholding.
Technical Requirements Backend (Primary Focus - 60-70%)
* Java development
* Spring Boot
* REST APIs and Microservices
* Application design and architecture
* Database design and integration
* Performance tuning and troubleshooting
Frontend (30-40%)
* Node.js
* UI development experience
* Ability to independently implement frontend changes
Cloud & DevOps
* AWS Cloud Services
* Amazon EKS (Elastic Kubernetes Service)
* Cloud deployment and support
* CI/CD pipelines
* Jenkins
* Spinnaker (future-state deployment platform)
Database
* Oracle experience
* PostgreSQL experience preferred
* Database design and data modeling knowledge Quality Engineering (Mandatory)
* Unit Testing
* Integration Testing
* API Testing
* Test Automation Frameworks
* Test Case Development
Developers are expected to write and maintain their own automated tests.
Production Support (Important)
Candidates should have experience with:
* Production issue investigation
* Root cause analysis
* Log analysis
* Performance troubleshooting
* Cloud deployment troubleshooting
* Resolving production defects independently
* Recommending improvements and preventative measures
The team is looking for engineers who can diagnose and solve issues rather than simply escalate them.
Preferred Skills
* Adobe Experience Manager (AEM)
* AWS Public Cloud migration experience
* Financial Services / Payments domain experience
AI & Modern Development Practices
* Comfortable working with Large Language Models (LLMs), AI tools, and AI-assisted development workflows
* Exposure to GitHub Copilot, Claude, ChatGPT, or similar tools is a plus
* Open to leveraging AI tools for productivity, code quality, and modernization initiatives
What the Hiring Manager is Looking For
* Strong Full Stack Java Engineer
* Independent problem solver
* Hands-on contributor across development, testing, deployment, and support
* Able to participate in architecture and design discussions
* Comfortable owning work from development through production support
* Capable of contributing immediately with minimal ramp-up