Senior Full-Stack Software Developer (Java+React)

ELEKS Software Engineering & Development Office is looking for a Senior Full-Stack Software Developer (Java+React) based in Buenos Aires for a hybrid position: 2–3 days per week onsite at our local office, with the remaining days remote.

Working hours 10:00 AM – 6:00/7:00 PM ART

ABOUT PROJECT

The client is among the top-5 health insurance companies in the US. They are dedicated to expanding access to high-quality, cost-effective health care and equipping their members with information and tools so they can make the best health care decisions for themselves and their families.

REQUIREMENTS

• 5+ years of professional experience in Java backend development
• Strong proficiency in Java with hands-on experience in Spring Boot 3.x
• Solid experience designing and building REST APIs consumed by multiple downstream systems
• Solid understanding of REST API design, authentication, authorization, and web security principles
• Hands-on experience with Databricks for data processing and data engineering workflows
• Working frontend development skills — React, TypeScript, CSS; ability to contribute to UI features alongside backend work
• Experience with ARO (Azure Red Hat OpenShift) or equivalent container orchestration platforms
• Proficiency in CI/CD tooling — Jenkins
• Proficiency in Git including branching workflows, code reviews, and pull requests
• Hands-on experience with GitHub Copilot or other AI-based coding assistants
• Hands-on experience with developer tooling: IntelliJ IDEA, VS Code, Git, Chrome Developer Tools
• Solid communication and collaboration skills with ability to engage both technical and non-technical stakeholders

NICE TO HAVE

• Experience in the healthcare domain or regulated industry environments
• Deeper frontend experience with Redux, Webpack, and Microfrontend (MFE) architecture
• Familiarity with MuleSoft or API integration platforms
• Experience with containerization (Docker, Kubernetes) and cloud platforms (AWS, Azure, GCP)
• Understanding of DevSecOps practices and GitOps workflows
• Knowledge of code quality scanning tools such as SonarQube
• Working knowledge of Dynatrace for monitoring and observability
• Basic experience with NGINX and PCF/OpenShift
• UCD (UrbanCode Deploy), Insomnia
• Experience working in agile delivery teams — comfortable with estimation, sprint planning, and Jira

RESPONSIBILITIES

• Develop backend functionality for the enterprise time‑tracking platform
• Implement new features, enhancements, and integrations
• Optimize data processing, API performance, and backend logic
• Participate in refinement, planning, and technical discussions
• Collaborate with PM, Designers, QAs, and senior developers
• Investigate and troubleshoot production issues when needed
• Ensure code quality following engineering best practices
• Contribute to architectural decisions and propose improvements

WHAT YOU WILL GET WITH ELEKS

• Close cooperation with a customer
• Challenging tasks
• Competence development
• Ability to influence project technologies
• Team of professionals
• Dynamic environment with low level of bureaucracy

ABOUT ELEKS

ELEKS is a custom software development company. We deliver value to our clients, thanks to our expertise and experience gained from working as a software innovation partner since 1991.

Our 2000+ professionals located in the Delivery Centers across Eastern Europe and sales offices in Europe and North America, provide our clients with a full range of software engineering services. These include product development, QA, R&D, design, technology consulting and dedicated teams.