Xlysi LLC

Sr. Java Full Stack Developer | W2 Contract | USC Only | Remote.

Xlysi LLC  •  Chicago, IL (Remote)  •  5 hours ago
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Job Description

About the Role

We are looking for a highly experienced Java Full Stack Developer to design, build, and support enterprise-grade applications spanning backend microservices, event-driven pipelines, and modern frontend interfaces. The ideal candidate is a seasoned engineer comfortable owning features end-to-end — from API design through UI delivery — with strong production support experience. Experience in healthcare provider onboarding or payment/claims processing systems is a strong plus.

Key Responsibilities

·                  Design, develop, and maintain scalable backend services using Java, Spring Boot, and Spring Security

Build and consume RESTful APIs; implement authentication/authorization (OAuth2, JWT) using Spring Security

Develop event-driven and streaming solutions using Apache Kafka (producers, consumers, topic design, error handling)

Build responsive, component-based UIs using ReactJS and/or Angular

Design and manage data models across MongoDB (NoSQL) and Oracle / PostgreSQL (relational)

Deploy, monitor, and manage applications on AWS (EC2, S3, Lambda, RDS, CloudWatch, or similar services)

Provide production support — triage incidents, perform root cause analysis, and implement fixes under SLA-driven timelines

Write unit, integration, and end-to-end tests; participate in code reviews

Collaborate with cross-functional teams (QA, DevOps, Product) in an Agile/Scrum environment

Contribute to CI/CD pipeline development and deployment automation

Mentor junior/mid-level developers and contribute to technical design decisions

Document technical designs, runbooks, and support procedures

Required Skills & Qualifications

·                  Bachelor's degree in Computer Science, Engineering, or related field (or equivalent experience)

·                  10+ years of professional experience in full stack Java development, with strong, hands-on software development experience across the full lifecycle (design, coding, testing, deployment)

Strong hands-on experience with Java, Spring Boot, Spring MVC, Spring Security

Practical experience with Apache Kafka in production environments

Proficiency in at least one modern frontend framework: ReactJS and/or Angular

Experience working with both NoSQL (MongoDB) and relational databases (Oracle, PostgreSQL)

Working knowledge of AWS cloud services and cloud-native deployment practices

Demonstrated experience in production support — incident management, debugging live systems, performance tuning

Familiarity with microservices architecture and containerization (Docker/Kubernetes a plus)

Experience with Git, CI/CD tools (Jenkins, GitLab CI, or similar)

Strong understanding of REST API design, security best practices, and application performance optimization

Proven track record of delivering production-quality code in a professional team setting

Nice to Have

·                  Healthcare industry experience, particularly in provider onboarding and payment/claims systems — candidates with this background are strongly preferred

Experience with monitoring/observability tools (Splunk, Grafana, ELK stack, CloudWatch)

Exposure to regulated industries (healthcare, payments, financial services)

Experience with Airflow, Snowflake, or other data engineering tools

Agile/Scrum certification

Soft Skills

·                  Strong problem-solving skills, especially under production incident pressure

Ability to communicate clearly with both technical and non-technical stakeholders

Ownership mindset — comfortable being on-call/rotational support

Leadership presence — able to guide technical direction and mentor team members
Xlysi LLC

About Xlysi LLC

Xlysi LLC provides expert consulting services, world-class enterprise implementation and integration consulting and staffing services. Our value proposition is simple: Combine highly experienced consultants with a team-based approach and industry-leading tools to help you maximize your technology investments. The company provides a full range of staffing solutions ranging from individual placement of expert consultants for contingent to direct-hire positions, to on-demand implementation and management consulting services.

Specialties

Enterprise Portals (LifeRay/IBM WebSphere/MS SharePoint), Web Content Management Consulting ( Adobe CQ/LifeRay), Analytics, Custom Software Solutions, Data WareHousing & Cloud Computing

Industry
IT & Software
Company Size
11-50 employees
Headquarters
Vernon Hills, Illinois
Year Founded
2006
Website
xlysi.com
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