resume
Keanna Sion
Senior Application Developer | .NET & Cloud Solutions
📧 sion.keanna@gmail.com | 📞 678.462.2106 | 📍 Smyrna, GA
Profile
Senior Application Developer with 10+ years of experience building enterprise .NET applications, APIs, and cloud-based solutions. Skilled in C#, SQL, React, Azure, and Oracle C2M integrations. Adept at modernizing legacy systems, designing microservices, writing technical documentation, and providing production support. Recognized for cross-team collaboration, mentoring, and delivering reliable, scalable applications in utility and enterprise environments.
Education
Bachelor of Science in Computer Science, Co-operative Education Designation
Georgia Institute of Technology, Atlanta, GA
Work Experience
June 2024 – March 2025
- Modernized customer-facing systems by decomposing a legacy monolith into domain-aligned .NET Core services, implementing CQRS patterns and supporting asynchronous, event-driven workflows.
- Designed and deployed a secure PIN verification service integrated with Oracle C2M, utilizing a server-side cache of verification attempts to enforce rate limiting and account lockout policies.
- Managed large-scale messaging platforms (SMS/email) reaching millions of utility customers; wrote Oracle SQL scripts to query, transform, and ensure data reliability. Ensured deliverability, compliance with regulations, and system reliability.
- Maintained and updated high-volume SMS and email templates via large-scale SQL scripts, ensuring accuracy across customer communications while adhering to strict versioning protocols for rollback and auditability.
- Used Azure DevOps for pull request workflows, build and release management, and coordinating CI/CD across multiple environments.
- Authored technical documentation (API specs, sequence diagrams) to support maintainability and cross-team understanding.
- Provided on-call production support, troubleshooting critical incidents and implementing root cause fixes to improve system reliability.
- Collaborated with business analysts, QA, and non-technical stakeholders to ensure system compliance and business alignment.
May 2015 – April 2024
April 2021 – April 2024
- Led a team of five engineers building distributed systems and APIs to transform raw dealership inventory and sales data into dynamic automotive ad creative across search, display, social, video, and connected TV channels for Tier II OEM advertising programs.
- Designed and implemented scalable microservices in .NET Core on Azure Kubernetes Service, integrating with Cosmos DB, Service Bus, and Event Hub to support high-throughput, event-driven workflows.
- Engineered automated reporting pipelines using in-memory DataFrame processing to reconcile warehouse data through complex joins and aggregations, producing OEM compliance reports delivered via scheduled FTP.
- Delivered resilient third-party API integrations, ensuring compliance with evolving data and creative delivery requirements.
- Served as Scrum Master, facilitating agile ceremonies, mentoring junior developers, and producing actionable engineering documentation.
- Owned production stability, triaging and resolving bugs across high-visibility, revenue-impacting systems.
May 2015 – April 2021
- Built distributed worker processes and APIs supporting lead generation, validation, and submission flows across customer-facing applications including Trade Report, Performance Reports, and Facebook Ads.
- Engineered a data-driven forms engine enabling dynamic front-end rendering via backend configuration, reducing new partner onboarding from a full sprint of frontend and backend effort to a half-day, backend-only implementation.
- Built and maintained automated ad-generation infrastructure that transformed dealership inventory and sales data into creative assets trafficked directly to Google Ads, Bing Ads, and Facebook.
- Engineered budgeting and pacing logic across multiple ad platforms, leveraging hierarchical data structures to optimize spend allocation and campaign performance.
- Collaborated with external partner teams at Google, Bing, and Facebook to ensure API compliance, resolve integration issues, and maintain platform stability.
January 2013 – May 2015
- Contributed as a full-stack engineer on a high-traffic job seeker platform supporting desktop and mobile experiences using ASP.NET (.NET Framework), C#, and vanilla JavaScript.
- Supported a modernization initiative transitioning legacy VB.NET Web Forms components to C#-based ASP.NET services.
- Implemented responsive UI components using the Foundation grid system to ensure consistent usability across screen sizes and devices.
- Developed the initial iteration of a swipe-based mobile job browsing feature to streamline job discovery.
- Built and enhanced backend services and APIs supporting the company-wide Mobile-Off Platform initiative, improving mobile search and application workflows.
- Awarded the Q4 2013 Poppendieck Award for high-impact delivery aligned with Lean/Agile engineering principles.
Personal Projects
Craft Desk
- Architecting and developing a full-stack inventory and tagging system (React + .NET Core API) to manage and search craft supplies by theme, color palette, and category.
- Designing a relational schema in SQLite to support many-to-many relationships (e.g., supplies ↔ tags) and flexible filtering scenarios.
- Implementing dynamic, multi-criteria search endpoints to enable theme- and color-based discovery across supply types.
- Applying RESTful API design principles and structured DTO patterns to separate domain models from transport contracts.
- Containerizing frontend, API, and database services with Docker to ensure environment consistency and reproducible local development.
GitHub Resume
- Implemented a multi-environment CI/CD pipeline using GitHub Actions and Jekyll, enabling isolated staging deployments via branch-based workflows without affecting production.
- Authored and hosted this resume in Markdown via GitHub Pages at ksion.github.io/resume
Core Skills
Languages & Backend: C#, .NET (Framework 4.8; .NET 6-8), ASP.NET Core, RESTful APIs, Entity Framework (EF Core), LINQ
Frontend: React, HTML, CSS, Javascript, jQuery
Databases & Stores: SQL Server, Oracle, Cosmos DB, Azure Blob/Table Storage, SQLite, Snowflake (Data Warehouse), Infor Birst
Security & Auth: OAuth 2.0, API authentication, token expiration, rate limiting, secure API design
Testing: TDD, xUnit, NUnit, Moq, FakeItEasy, unit/integration testing, desk-checking
API Tooling: Postman, Swagger / OpenAPI
Cloud & DevOps: Azure (App Service, Worker Services / VM-hosted background workers, AKS, Service Bus, Event Hubs), AWS (basic), Docker, Kubernetes, Azure DevOps, GitHub Actions, CI/CD
Architecture & Integration: Microservices, CQRS, event-driven architecture, DDD, vertical slice, layered (n-tier), clean code, functional programming
Observability: Application Insights, Prometheus, Grafana, Loggly, Lens (OpenLens), Windows Event Log & flat-file log analysis (legacy COM/enterprise environments)
Delivery & Leadership: Agile/Scrum, Scrum Master (Certified 2022), team lead, mentorship, technical documentation, roadmapping, incident response
Hobbies
Card Making, Travel, ATL UTD (Footie Mob Member, 2019)