Full-Stack Java Developer

McKesson is an impact-driven, Fortune 10 company that touches virtually every aspect of healthcare. We are known for delivering insights, products, and services that make quality care more accessible and affordable. Here, we focus on the health, happiness, and well-being of you and those we serve – we care. What you do at McKesson matters. We foster a culture where you can grow, make an impact, and are empowered to bring new ideas. Together, we thrive as we shape the future of health for patients, our communities, and our people. If you want to be part of tomorrow’s health today, we want to hear from you. McKesson complies with all applicable U.S. immigration laws and regulations. The Company does not provide employer support or sponsorship for any immigration related employment benefit for this role. Applicants must be currently authorized to work in the United States on a fulltime basis without the need for employer support or sponsorship now or in the future. This includes having the legal right to work in the United States without the need for McKesson support or sponsorship for any immigration related employment authorization (e.g., H1B, O1, E3, H1B1, TN, F1 OPT, F1 STEM OPT, F1 CPT, etc.) now or in the future. If you will require McKesson to provide immigration support or sponsorship now or in the future, you should not apply for this position About Ontada Ontada is an oncology technology and insights business dedicated to transforming the fight against cancer. Part of McKesson Corporation, a Fortune 7 company, Ontada was founded on the core belief that precise insights — delivered exactly at the point of need — can improve patient outcomes. Ontada connects the full patient journey by unifying technology, real-world data, and analytics to accelerate innovation in cancer care. Position Summary We are looking for a driven, hands-on Full-Stack Java Developer to help design, build, and evolve enterprise-grade platforms at Ontada. This role spans both backend services and modern web user interfaces, contributing across the full stack to deliver secure, scalable, high-performing solutions in a regulated PHI/HIPAA environment. You will work closely with product, architecture, and engineering partners — including onshore and offshore teams — to translate requirements into well-engineered, production-ready software. Key Responsibilities Design, develop, and maintain full-stack applications spanning Java backend microservices and React-based front ends. Build and consume RESTful APIs; design JSON contracts and negotiate endpoints with consuming services. Develop responsive, accessible web UIs using React, TypeScript, and modern JavaScript. Implement and maintain Spring Boot microservices and Spring Batch jobs for ingestion and transformation workloads. Model and evolve relational data structures in PostgreSQL; write performant SQL and database migrations. Contribute to event-driven architectures using Kafka for asynchronous, decoupled communication between services. Containerize and deploy services to Kubernetes on Azure, leveraging Azure Blob Storage, Azure Key Vault, and related Azure services. Apply CI/CD best practices using GitHub Actions, ArgoCD, Helm, and JFrog/Artifactory. Participate in architecture, design, and planning sessions; produce clean, reusable, testable, and well-documented code. Perform code reviews, root-cause analysis, and resolution of complex defects across the stack. Implement security, data protection, and audit controls appropriate to a PHI/HIPAA environment. Write unit, integration, and end-to-end tests; contribute to meeting platform test-coverage standards. Collaborate with engineers (onshore and offshore) and share best practices across the team. This description is general and not intended to be an exhaustive list of all responsibilities. Other duties may be assigned as needed to meet company goals. Current Technology Stack Backend: Java, Spring Boot, Spring Batch, RESTful microservices Frontend: React 18+, TypeScript, JavaScript (ES6+), HTML5, CSS3, micro-frontends Data: PostgreSQL 16+ Messaging / Streaming: Apache Kafka (Confluent) Cloud & Infrastructure: Microsoft Azure, Kubernetes, Docker, Azure Blob Storage, Azure Key Vault Identity: Okta, OAuth 2.0, OIDC CI/CD & Tooling: GitHub, GitHub Actions, ArgoCD, Helm, JFrog/Artifactory, Maven/Gradle Minimum Requirement Degree or equivalent and typically requires 4+ years of relevant experience. Education Bachelor's degree in Computer Science, Engineering, Mathematics, or a related field, or equivalent combination of education and experience. Critical Skills 4+ years of professional software engineering experience building enterprise-scale applications. 2+ years of hands-on experience with Java, Spring, and Spring Boot in a microservices architecture. 2+ years of hands-on experience building modern web front ends with React, TypeScript, and JavaScript. Working knowledge of relational databases and SQL (PostgreSQL preferred). Experience designing and consuming RESTful APIs (JSON contracts, endpoint negotiation). Hands-on experience with containerization (Docker) and orchestration (Kubernetes). Experience with at least one major cloud platform (Azure preferred). Proficiency with Git/GitHub and collaborative branching workflows. Working knowledge of CI/CD pipelines, automated testing, and Agile/SDLC delivery practices. Strong written and verbal communication. Continuous-improvement mindset; thrives in a fail-fast, iterative environment. User- and client-first focus with a commitment to application quality and performance. Effective collaborator across distributed onshore and offshore teams. Nice-to-Have Qualifications Experience with Apache Camel for declarative enterprise integration and routing. Experience with Debezium and Change Data Capture (CDC) patterns. Experience with event-driven architectures on Kafka