Senior .NET Developer with Angular Expertise

DYLAN MESSER

SENIOR TECHNICAL LEAD

Orlando, FL 321-***-**** *****@*******.*** LinkedIn

PROFESSIONAL EXPERIENCE

Senior Technical Lead, Teladoc Health May 2023 — Oct 2025

• Led design and delivery of Virtual Care and B2B apps using C#, .NET Core, React, and TypeScript, shipping 22 production features across 3 quarterly roadmaps for member support and provider tooling, ensuring compliance with HIPAA and HITECH regulations.

• Architected a unified OneApp integrating 3 product lines (Telemed, Chronic Care, MyStrength) using React, TypeScript, Redux, and ASP.NET Web API, consolidating 12 member and provider workflows into a single application.

• Built backend services with .NET Core, Entity Framework, and Microsoft SQL Server, decomposing monolith endpoints into microservices using Clean Architecture and CQRS and implementing data encryption and access controls to safeguard PHI (Protected Health Information).

• Conducted performance tuning and optimization of complex SQL queries and stored procedures in Microsoft SQL Server, optimized ETL processes using Azure Data Factory and SSIS to streamline data ingestion from multiple sources, processing over 1 million records daily.

• Designed and published 48 reusable WCAG -compliant components with React, HTML5, CSS3 / SASS, and ESLint, cutting duplicate UI implementations and standardizing accessibility to meet ADA (Americans with Disabilities Act) requirements.

• Optimized front-end performance via code splitting, lazy loading, and caching, reducing initial JavaScript bundle size by 1.8 MB and trimming median load time by 1.2 seconds across Chrome, Safari, and Firefox.

• Engineered auth with OAuth 2.0, OpenID Connect, JWT, and Azure AD, integrating 4 identity providers and enforcing 2- factor requirements across 3 critical user roles.

• Containerized services with Docker and deployed to AKS via Terraform, standing up 5 clusters and enabling blue-green deployment across dev, test, stage, and prod.

• Migrated 7 front-end apps from AWS S3 / CloudFront to Azure Storage / Front Door, cutting 4 legacy buckets and 3 distributions after parity validation.

• Orchestrated 7 data movement pipelines with Azure Data Factory, including 3 scheduled copy jobs to Snowflake and Databricks Notebooks for 4 daily transformations.

• Built a multi-layer test strategy with Jest (unit), Cypress (e2e), and xUnit (API), adding 480 unit tests, 96 e2e tests, and 38 API tests to stabilize refactors.

• Implemented Redis and Elasticsearch layers for 5 high-traffic features, reducing backend read calls by 12,600 per weekday and cutting search latency by 190 milliseconds per query.

• Used GitHub Copilot to generate 19 secure code templates (JWT validation, OAuth flows, input sanitization) adopted across

.NET and Node.js services.

• Mentored 6 junior developers, ran 36 code review clinics, and hosted 14 show-and-tell demos that accelerated adoption of team-wide patterns.

• Facilitated Agile practices across 10 sprints, completing 212 story points with 0 carryover across the last 3 sprints through tighter backlog refinement and risk tracking.

Senior Software Security Engineer, Booz Allen Jun 2018 — Apr 2023

• Built new .NET 8 microservice APIs with Entity Framework Core and Microsoft SQL Server; reduced average API response time from 420 ms to 140 ms across 18 high-traffic endpoints.

• Developed an Azure-hosted ASP.NET Core MVC app with Entity Framework Core (Repository + Unit of Work), LINQ, Razor, and Bootstrap; implemented 210 unit tests (xUnit) covering the data layer and core services.

• Migrated Angular + Express and .NET services from Azure VMs / GitLab to Azure App Services / Azure Repos; upgraded 120 dependencies and closed 64 security advisories during the transition.

• Stabilized legacy AngularJS + .NET Framework 4.7.2 while shipping a new Angular 12 + .NET 6 view; closed 73 defects and delivered 19 features in 4 sprints.

• Built Angular components for meeting prep with A11y checks (axe core) and Lighthouse audits; achieved Lighthouse accessibility scores of 100 across 6 key views.

• Set up Nx Monorepo for Angular libraries and shared UI kits; cut CI build stages from 5 to 2 and reduced average build time from 18 minutes to 7 minutes.

• Implemented OAuth 2.0, JWT rotation, and short lived tokens with refresh flows; reduced average token lifetime to 900 seconds and invalidated 100 compromised tokens within 60 seconds of detection.

• Added server side validation, parameterized queries, and ORM safe defaults; remediated 58 findings from SAST / DAST scans

(SonarQube, OWASP ZAP) and 12 from pen tests.

• Instrumented audit logging and anomaly detection (Datadog, Azure Monitor) with KQL / Log Analytics; detected 27 privilege escalation attempts and auto revoked access within 2 minutes via runbooks.

• Configured secrets management with Azure Key Vault and rotation runbooks; rotated 42 application secrets and 18 certificates without service interruptions.

Software Engineer, Comcast May 2013 — May 2018

• Designed application UI pages utilizing HTML5, CSS3, Bootstrap, and JavaScript in an ASP.NET Web API environment, enhancing user experience across 10+ application modules.

• Recreated application pages by replicating WinForms functionality, ensuring a seamless transition for over 500 users and improving overall user interface consistency.

• Migrated source data into Microsoft SQL Server 2012 tables and validated output data pre-production, improving data integrity for 1 million+ records.

• Developed a greenfield project using Next.js, React, TailwindCSS, and TypeScript, transforming an off-hours initiative into a strategic company roadmap project with 3,000+ users.

• Worked with a team in the development of a new API application with Node.js and Express, enhancing application structure and testing methodologies through knowledge-sharing sessions for 5 team members.

• Coordinated with QA Testing teams for defect tracking and resolution, facilitating effective communication with clients and stakeholders to gather requirements for 20+ projects.

• Converted a .NET application to Microsoft Azure Cloud Services, playing a key role in cloud deployment that supported 2,000+ concurrent users.

• Developed a high-traffic RESTful WCF service that integrated with a legacy billing system, designed for extensibility and achieving 100% test coverage with 50+ unit tests.

• Designed, developed, and deployed SSIS / SSRS packages while optimizing Microsoft SQL Server databases, significantly improving reporting efficiency for 200+ reports.

• Collaborated on data modeling for a new application, leveraging PostgreSQL and MongoDB to meet evolving business needs for 1 million+ records.

EDUCATION

Penn State University 2016 — 2019

Bachelor’s degree of Information Sciences and Technology University of Maryland 2012 — 2013

Associate’s degree of Concentration in Computer Studies SKILLS

C# .NET Core ASP.NET Core Blazor

React Angular TypeScript HTML

CSS JavaScript Node.js Entity Framework

LINQ T-SQL MS SQL Server PostgreSQL

MySQL MongoDB DynamoDB Redis

Elasticsearch Unit Testing Datadog Azure

AWS Terraform Git Azure DevOps

GitHub Copilot RabbitMQ Agile Scrum

ADDITIONAL INFORMATION

• Links: GitHub, Personal Website

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