Dylan Messer

Senior engineer delivering cross-platform mobile and web experiences with React Native, React, and TypeScript, building secure, high-availability products in AWS. Experienced leading end-to-end delivery for telehealth workflows including appointment scheduling, secure messaging, provider dashboards, and patient engagement, with production ownership across CI/CD, observability, and performance. Strong background in application security, privacy-by-design, and regulated-data controls, partnering with product, design, and clinical stakeholders to ship accessible, reliable user experiences.

Senior Technical Lead at Teladoc Health (2023-05 – 2026-06)

• Led delivery of a telemedicine mobile experience using React Native, React, and TypeScript for appointment booking, secure messaging, and provider queue workflows, improving task completion by 28%.
• Built reusable UI components and navigation patterns with React Native and Redux Toolkit, reducing new feature build time by 35% across 6 product squads.
• Implemented offline-first patient intake and document upload flows using React Native, AsyncStorage, and S3, cutting failed submissions by 22% on low-connectivity networks.
• Integrated secure authentication and session management using OAuth 2.0, OpenID Connect, and JWT, decreasing account takeover incidents by 40% through tighter token lifetimes and device binding.
• Instrumented mobile and web telemetry with CloudWatch, OpenTelemetry, and Sentry, improving crash-free sessions to 99.6% and reducing MTTR by 31%.
• Automated releases with GitHub Actions and Fastlane, enabling weekly mobile deployments and cutting release cycle time from 10 days to 3 days.
• Hardened data handling for regulated patient information using KMS encryption, S3 bucket policies, and secure storage patterns in React Native, supporting privacy and audit requirements.
• Mentored 7 engineers on TypeScript patterns, performance profiling, and secure coding, raising PR throughput by 18% while improving code review quality.

Senior Software | Security Engineer at Booz Allen (2018-06 – 2023-04)

• Delivered cross-platform internal investigation tooling using React, TypeScript, and Redux Toolkit to triage alerts and manage cases, reducing analyst handling time by 25%.
• Implemented secure API access patterns with OAuth 2.0, JWT, and AWS API Gateway, improving authorization consistency across 12 services.
• Built event-driven alert pipelines using AWS Lambda and SQS, processing 2M+ daily events with automated deduplication and retry controls.
• Automated security checks in GitHub Actions with dependency scanning and secret detection, cutting high-severity findings by 45% over 2 quarters.
• Instrumented service health and audit trails using CloudWatch logs/metrics and structured JSON logging, improving incident detection time by 30%.
• Strengthened data protection controls using KMS and least-privilege IAM policies, supporting compliance-driven access reviews and audit readiness.

Software Engineer at Comcast (2013-05 – 2018-05)

• Built customer-facing web features using React and JavaScript, improving self-service completion rates by 17% through streamlined account workflows.
• Developed backend-for-frontend services with Node.js and Express to aggregate account and device data, reducing page load time by 24%.
• Implemented caching and rate-limiting with Redis to stabilize peak traffic, lowering p95 latency by 35% during high-volume events.
• Automated deployments using Jenkins and Docker, reducing rollback time from hours to under 15 minutes.

Bachelor's degree in Information Sciences and Technology – Penn State University (2016 – 2019)

Associate's degree in Concentration in Computer Studies – University of Maryland (2012 – 2013)