David Turner

Senior Software Engineer with 10+ years of experience building scalable cloud-native applications and distributed systems across healthcare and retail. Expertise in Node.js, Java, AWS, event-driven architecture, and AI-powered backend solutions. Proven track record of designing high-performance platforms, leading technical initiatives, and delivering secure, scalable systems.

Senior Software Engineer, Tech Lead at Dexcom (2020-06 – Present)

• Architected a cloud-native AI-powered CGM platform using Nest.js, React, AWS, and Kafka, supporting 2M+ patients and 100M+ daily glucose readings with 99.99% uptime.
• Modernized monoliths into event-driven Node.js microservices with Kafka, GraphQL, Redis, and PostgreSQL, reducing API latency 57% and increasing throughput 60%.
• Built an enterprise AI platform with LLMs, RAG, vector databases, and MCP, enabling secure, context-aware clinical decision support.
• Deployed DeepSeek R1 and MedGemma on AWS with SageMaker, EC2, and Terraform, reducing ML data preparation 40%.
• Reduced infrastructure costs 30% using Docker, Kubernetes, Amazon ECS, Terraform, and automated GitHub Actions CI/CD.
• Led 8 engineers, driving architecture, observability, and engineering standards, reducing incident resolution time 50%.

Software Engineer at Walmart (2016-02 – 2020-05)

• Built cloud-native microservices with Nest.js, Spring Boot, Angular, and SQL Server, supporting 15M+ daily transactions with 99.99% uptime.
• Designed REST APIs, GraphQL, and Kafka event pipelines, reducing inventory discrepancies 35% across fulfillment centers.
• Optimized PostgreSQL, Redis, and async processing, reducing API latency 40% and improving checkout performance.
• Modernized retail platforms on AWS, reducing deployment time 70%.

Software Engineer at CVS Health (2013-06 – 2016-01)

• Built healthcare APIs with Java(Spring Boot), Django, and SQL Server, reducing prescription processing 40%.
• Delivered AWS CI/CD pipelines, reducing deployment time 70%.

B.S. in Computer Science – University of Texas at Austin (2013)