Daniel Nicolas Graham

Senior Python Developer at HCA Healthcare

Designed, developed, and maintained secure, high-performance healthcare applications using Python and FastAPI, managing over 1 million patient records. Created modular microservices for patient data ingestion, transformation, and distribution, enabling seamless platform integration. Migrated legacy monoliths to cloud-native architectures on AWS (EC2, S3, RDS, Lambda), achieving scalability and fault tolerance. Implemented OAuth2/JWT authentication and RBAC to support HIPAA and SOC 2 compliance. Built and maintained CI/CD pipelines with GitHub Actions and Jenkins for automated testing and zero-downtime deployments. Containerized services with Docker and deployed via Kubernetes. Monitored health with Prometheus, Grafana, and AWS CloudWatch, reducing incident response time. Optimized PostgreSQL and MongoDB performance through indexing and schema design. Wrote unit, integration, and end-to-end tests with pytest and Selenium. Collaborated with data scientists, security analysts, and DevOps

Senior Python Developer at Optum

Led backend development using Django and Django REST Framework for clinical and insurance analytics tools. Designed scalable, versioned REST APIs serving real-time and batch requests. Migrated monoliths to modular Django apps for parallel development and easier deployments. Integrated with Cerner and EPIC EHR systems via HL7/FHIR interfaces for patient data synchronization. Architected Celery with Redis for asynchronous tasks. Used Azure Blob Storage and Azure Functions for event-driven data processing. Tuned PostgreSQL databases with optimized indexes, stored procedures, and partitioning. Managed environments with Terraform and AKS. Enforced code quality with pre-commit hooks, mypy, and flake8; automated pipelines with GitHub Actions. Built system health dashboards with Azure Monitor, Grafana, and Prometheus. Mentored developers and led knowledge-sharing on performance and cloud architecture.

Python Developer at Improving

Built internal tools and customer-facing portals using Django, Vue.js, and Django REST Framework. Created REST APIs for financial data analysis, order tracking, and user management. Implemented authentication, RBAC, and audit logging. Designed and scheduled Celery tasks with Redis for asynchronous reporting and batch operations. Created Docker-based dev/test environments and Docker Compose. Wrote Terraform modules for provisioning Azure resources. Optimized PostgreSQL queries, improving dashboard load times. Introduced frontend test coverage with Jest and backend tests with pytest. Wrote SOPs for CI/CD using Azure DevOps Pipelines. Participated in Agile ceremonies and mentored teammates.

Senior Full-Stack Developer at Headspring

Supported full-stack development using Flask, React, and Bootstrap for HR, payroll, and internal reporting tools. Built and consumed REST APIs for CRUD operations and dashboards. Integrated legacy XML and SOAP services into modern REST pipelines. Improved cross-browser compatibility and accessibility. Wrote testable SQL queries and migrations for MySQL and PostgreSQL. Set up CircleCI and Git hooks to automate testing and deployment. Created automated ETL pipelines for CSV/Excel ingestion. Deployed on Linux, wrote Bash scripts, and managed logs. Participated in design meetings and client calls, contributing to product planning.