Software Engineer III — Full Stack (Backend-Focused, Core Platform Services)

McKesson•Irving, TX

1d•Hybrid

About The Position

McKesson is an impact-driven, Fortune 10 company that touches virtually every aspect of healthcare, known for delivering insights, products, and services that make quality care more accessible and affordable. McKesson fosters a culture where employees can grow, make an impact, and are empowered to bring new ideas. Ontada's Engineering team builds iKnowMed (iKM), the leading Oncology EMR platform used by thousands of clinicians across the US to manage cancer treatment, from regimen ordering and chemotherapy scheduling to genomic result interpretation and clinical trial matching. This role is for a Software Engineer III (P3) to design and build well-scoped core services, shared frameworks, and platform components that domain teams depend on to deliver clinical applications. It is a backend-first full-stack role, with the majority of time spent in Java and Spring Boot building services, APIs, and event-driven integrations. Frontend work will focus on building integration layers, enablement UIs, and end-to-end validation using React and TypeScript. The engineer will work within established architectural standards, collaborate closely with senior engineers and architects, and focus on making services reusable, well-documented, and easy for other teams to adopt. Success is measured by both what is built and how effectively other teams can build on top of it. This role is ideal for an engineer who enjoys building foundations for other teams, cares deeply about API design, modularity, and developer experience, wants to work in a high-impact healthcare domain, and is ready to own well-scoped services end-to-end without owning the overall architecture.

Requirements

Degree or equivalent and typically requires 4+ years of relevant experience
Bachelor's degree in Computer Science, Software Engineering, or equivalent practical experience
5 to 7 years of professional software development experience, with the majority in backend/server-side development
Strong proficiency in Core Java and Spring Boot (dependency injection, REST controllers, data access, testing)
Experience designing and implementing RESTful APIs consumed by multiple client applications
Practical experience with event-driven architectures — producing and consuming messages via Kafka or equivalent
Solid understanding of relational databases — SQL, ORM (JPA/Hibernate), indexing, query optimization, transaction management
Experience working with or integrating into data platforms (Databricks, Spark, or equivalent) for analytics or pipeline support
Ability to investigate production issues using Dynatrace — navigating logs, analyzing response time metrics, and following distributed traces
Working experience with React.js and TypeScript
Understanding of how frontend applications consume backend APIs, handle state, and render data
Ability to build or modify frontend components to support end-to-end feature delivery
Solid understanding of Linux/Unix environments, shell scripting, and basic networking
Experience with Git, CI/CD pipelines, and automated testing practices
Clear written and verbal communication — ability to document services and explain technical decisions

Nice To Haves

Experience in healthcare IT or familiarity with clinical data standards (HL7, FHIR, C-CDA, SNOMED, LOINC, RxNorm)
Experience building shared libraries, SDKs, or platform services consumed by other engineering teams
Exposure to containerization (Docker) and orchestration
Experience with Elasticsearch for search or indexing use cases
Familiarity with Agile/Scrum methodologies in enterprise environments

Responsibilities

Design and implement well-scoped backend services and shared components using Java and Spring Boot, following established architectural patterns
Build and maintain RESTful APIs with clear contracts, consistent error handling, and comprehensive documentation that domain teams can adopt with minimal friction
Implement event-driven integrations using Kafka — produce and consume events that connect clinical workflows across services (e.g., order state changes, lab result notifications, patient data sync)
Build data integrations and pipeline components that connect to Databricks for analytics, reporting, and clinical data processing
Write production-quality code against Oracle databases using JPA/Hibernate, with attention to query performance, transaction management, and data integrity
Contribute to common core services, shared libraries, and frameworks that are consumed by multiple clinical domain teams (ordering, scheduling, clinical documents, genomics)
Build services with reusability as a first-class requirement — consistent API patterns, well-defined event schemas, clear extension points
Collaborate with domain teams to understand their integration needs and usage patterns, and adapt platform services to enable rapid application development
Follow platform conventions for API versioning, event contracts, data handling, error taxonomy, and security standards
Build frontend integration layers, admin UIs, and enablement interfaces using React and TypeScript to expose platform capabilities to end users and domain teams
Implement frontend changes required to validate end-to-end clinical workflows — ensuring backend services work correctly through the full stack
Work within the existing frontend architecture (Webpack Module Federation, legacy-to-modern migration patterns) without owning frontend architecture decisions
Develop unit, integration, and API-level tests to ensure correctness and prevent regressions
Participate in peer code reviews, applying established coding, security, and quality standards
Create and maintain clear technical documentation (Markdown, Mermaid diagrams, API specs) that enables domain teams to self-serve
Use Dynatrace for log analysis, metrics review, and distributed trace investigation to diagnose and resolve production issues with guidance from senior engineers
Implement structured logging, telemetry, and error-handling patterns defined by the platform team
Identify and implement incremental improvements to service reliability, performance, and operational visibility within your owned components
Participate actively in sprint planning, backlog refinement, sprint reviews, and retrospectives
Deliver committed work predictably, surface risks early, and communicate blockers clearly
Adopt approved tools, frameworks, and CI/CD patterns defined by platform and architecture teams