Software Engineer Senior

Derek Dyer

Senior Software Engineer, Tech Lead C#, ASP.NET, React, Angular Azure, AWS

Holiday, Florida, United States 469-***-**** ************@*****.*** LinkedIn Profile TECHNICAL SKILLS

● Languages: C#, Typescript, Javascript, Python, HTML, CSS, Powershell, Bash

● Frameworks: ASP.NET, .NET Core, MVC, Web API, EF Core, T-SQL, WCF/SOAP, REST

● Frontend: Angular, React, Kendo UI, WCAG 2.1, Material UI, Bootstrap

● Cloud - Azure: AKS, App Service, Front Door/CDN, API Management, Key Vault, WAF, Monitor, App Insights, Log Analytics, Managed Prometheus/Grafana

● Cloud - AWS: EKS/ECS Fargate, API Gateway, Lambda, CloudFront, RDS SQL Server, DynamoDB, SQS/SNS, CloudWatch, X-Ray

● Data/Storage: SQL Server, PostgreSQL, Dynamo DB, Cosmos DB, Redis, S3/Blob

● DevOps/IaC: Terraform, CloudFormation, Bitbucket, Jenkins, Azure DevOps, Docker, Kubernetes

● Unit Testing: xUnit, NUnit, Jasmine, Karma, Cypress, WebDriver, Selenium, Postman, Moq, SonarQube

● Practices: DDD, CQRS, TDD, SLI/SLO, MTTR, code review SLAs, Agile/Scrum EXPERIENCE

Walmart, Bentonville, AR October 2022 - June 2025

Senior Software Engineer, Tech Lead

● Led rollout of a cloud-native commerce platform (ASP.NET Core 7 on Azure App Service and AKS/Kubernetes), supporting 120k+ DAUs and driving $7.2M annual revenue.

● Delivered WCAG 2.1–compliant, responsive checkout flows (Angular, Kendo UI, Azure Front Door/CDN), lifting conversion 6.4% and adding $3.4M GMV in 12 months.

● Engineered REST APIs fronted by Azure API Management (policies, throttling, auth offload) to broker secure traffic between Angular front ends and Azure microservices; reduced partner onboarding from 10 days to <48 hours.

● Refactored data access with EF Core on Azure Database for PostgreSQL – Flexible Server; improved P95 latency 38% and eliminated nightly maintenance windows.

● Implemented defense-in-depth: Azure WAF (Front Door/Application Gateway), Microsoft Entra ID / Azure AD B2C (OAuth2/OIDC), Managed Identities + RBAC, Azure Key Vault, end-to-end TLS/AEAD; passed third-party pen tests with zero critical findings.

● Built a Terraform-codified observability stack for 200+ AKS microservices using Azure Monitor, Application Insights, Log Analytics, Managed Prometheus, Grafana (with OpenTelemetry tracing); unified logs/metrics/traces, cut alert noise 40% and MTTR 65%.

● Automated CI/CD with Bitbucket Pipelines (+ Azure DevOps integrations), Terraform/IaC, and gated blue-green/canary strategies to AKS, Azure Functions, Azure Blob Storage, Azure DB for PostgreSQL; increased deploy frequency from weekly to 20/day with <1% rollback.

● Productionized a real-time recommendation engine (Azure Machine Learning training + .NET 7 inference on AKS) that increased AOV 11%.

● Mentored a 9-engineer team; introduced DDD, CQRS, GitFlow, quality gates, code review SLAs; PR cycle time 18h 4h, unit-test coverage to 83%.

MUFG, New York, NY May 2018 - September 2022

Senior Software Engineer

● Led modernization of legacy .NET systems into ASP.NET Core–based microservices deployed on AWS

(EKS/ECS Fargate, API Gateway, ALB/NLB), improving release velocity and service resiliency for core banking, compliance, and transaction systems.

● Designed 90+ RESTful APIs (C# / ASP.NET Core) on Microsoft SQL Server (RDS) using EF Core, stored procedures, and T-SQL query optimization for secure high-throughput access.

● Architected event-driven services (Lambda .NET + SQS/SNS) for KYC/AML verification, document processing, and regulatory reporting, cutting manual review time by 40%.

● Built responsive, accessible front-end applications using React and TypeScript, delivering high- performance WCAG 2.1–compliant user interfaces for internal and client-facing banking dashboards.

● Strengthened application and data security with AWS IAM least-privilege, KMS encryption, Secrets Manager, WAF/Shield, TLS/mTLS, and OAuth2/OIDC (via Amazon Cognito and enterprise SSO); ensured compliance with SOX, PCI-DSS, and internal audit policies.

● Enhanced system monitoring and observability with AWS CloudWatch, X-Ray, and Grafana dashboards, cutting MTTR by 55% and reducing alert noise by 35%.

● Implemented CI/CD pipelines using Bitbucket Pipelines, Jenkins, and Terraform, automating build, test, and deployment workflows with SonarQube, xUnit/NUnit, and security scanning, improving deployment reliability and audit traceability.

Commonwealth of Kentucky, Frankfort, KY July 2014 - May 2018 Software Engineer

● Built WCF (SOAP) and ASP.NET Web API (REST) services for secure file transfer and data exchange within the Enterprise Registration System (ERS); implemented AOP (PostSharp) for unified exception handling and logging to improve maintainability.

● Implemented data access layers using Dapper and Entity Framework 6 against Microsoft SQL Server and Oracle; delivered T-SQL/PL-SQL tuning (indexes, sargable queries, execution plan review) to reduce heavy queries’ runtime.

● Delivered claims-based authentication with ADFS (SAML 2.0) for external apps and Windows Integrated Auth for internal apps; enforced TLS, least-privilege roles, and IIS hardening for compliance.

● Developed ASP.NET MVC 4 UIs with Kendo UI, jQuery, AJAX, HTML5/CSS3; added client-side validation and reusable Kendo components to streamline forms and improve completion rates on registration and licensing flows.

● Adopted Redis for distributed caching to improve scalability; created Windows Services and scheduled console jobs for background processing (document ingestion, notifications, report generation).

● Owned SIT/UAT environment readiness: provisioned IIS websites/app pools, connection strings/secrets, and dependencies; authored deployment runbooks and configuration checklists to reduce release issues. NYC Department of Health and Mental Hygiene, New York, NY July 2010 - July 2014 Software Engineer

● Developed the POD Responder System using ASP.NET MVC 4.0, C#, and Web Services to register non-DOHMH personnel for emergency volunteering.

● Designed and exposed SOAP/REST web services for secure data exchange with the Identity Management Database (IDM), centralizing personnel records across multiple health programs.

● Automated data ingestion from Excel sources using LINQ to Excel and validation logic prior to import, reducing onboarding data errors by ~25%.

● Parsed and transformed XML payloads using LINQ to XML, integrating external service data into enrollment workflows with improved reliability and reduced manual reconciliation.

● Collaborated on database design and optimization in Microsoft SQL Server, writing stored procedures, T-SQL queries, and enforcing referential integrity for secure, auditable data management.

● Deployed and configured applications on IIS servers, adhering to .NET coding standards, security policies, and release procedures to ensure production stability and compliance. EDUCATION

University of South Florida 2009 - 2011

BSc, Computer Science

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