Preston Percival

• Architected SaaS-ready multi-tenant authorization system, migrating from Active Directory to Keycloak with unlimited organizational hierarchy support and modernizing authentication from WCF to .NET 9 gRPC, enabling market expansion and new revenue streams.
• Developed high-frequency trading system utilizing sub-millisecond precision optimization, advanced statistical analysis, and low-level TCP optimizations to secure transmission rights worth tens of millions annually with 100% auction win rate.
• Led Kubernetes migration of 100+ services from legacy Windows Server to cloud-native infrastructure, delivering millions in annual cost savings and 99.9% uptime SLA.
• Orchestrated company-wide AI hackathon engaging 100+ developers resulting in multiple greenlit AI projects advancing to implementation.
• Created AI-powered migration tools and infrastructure automating 80% of schema transitions, saving hundreds of user hours, and architected Model Context Protocol (MCP) servers enabling AI integration across the platform.
• Led Redis clustering migration and performance engineering, achieving 3x cache performance improvement with 60% latency reduction.
• Established structured hiring framework with objective criteria and technical assessment matrices, reducing time-to-hire across the organization.

• Optimized SharePoint site permission management, reducing runtime from 13 seconds to 8 milliseconds for sites with 100K users (99.9% improvement).
• Enhanced SharePoint group retrieval performance achieving 84% reduction in SQL reads, 92% CPU improvement, and 98% runtime decrease.
• Created integration test framework widely used with 100+ individual test cases, preventing production regressions in legacy codebase.
• Improved ad hoc query performance reducing SQL reads by 91%, CPU by 95%, and runtime by 98%.
• Led development of an internal Teams chatbot powered by LLMs, fine-tuning Vicuna-13B with LangChain for document embedding. Delivered production chatbot that improved team troubleshooting and onboarding.
• Mentored and onboarded multiple new employees, resulting in high performance ratings on subsequent reviews.

• Architected scalable multiplayer trivia application with live streaming capabilities using AWS serverless stack. Successfully supported 100K+ concurrent users in real-time gaming sessions.
• Led legacy application modernization for the Department of Veterans Affairs, migrating Java monolith to cloud-native Node.js architecture, achieving 50% cloud cost reduction and 50% code size reduction.

• Developed universal data integration processor supporting 200+ file formats, saving 400+ hours annually while increasing performance by 500%.
• Architected cloud and container deployment environments in AWS and Azure, making services Highly Available and saving hundreds of hours annually.
• Initiated CI/CD conversion using Azure DevOps, architecting solution and creating 50+ pipelines eliminating hundreds of developer hours annually.
• Created reliable, redundant, and distributed services with 99.9%+ uptime enabling users to meet market deadlines.
• Developed frontends and backends for custom web applications in Vue.js, TypeScript, and C#.

Backend & Platform

Cloud-Native & DevOps

Frontend

AI