Diego Leon

Online applicant tracking, job posting, resume management, AI scoring, candidate matching and hiring workflows.

• Lead migration from legacy MVC to Blazor Server, evolving a monolithic ATS into a modern service-oriented architecture with .NET 10 / ASP.NET Core APIs.
• Design, develop, and operate multi-tier web applications across Azure and AWS for job posting, applicant tracking, HR document automation, and secure business modules.
• Build and extend NinjaGig AI Suite using Gemini/Vertex AI, multi-model LLM evaluation, prompt design, structured extraction, skills/experience parsing, and recruiter-facing ranking workflows.
• Apply AI-native engineering workflows with Cursor, OpenAI Codex, Claude Code, and GitHub Copilot to accelerate refactoring, test generation, code review, documentation, and ATS/AI delivery.

Healthcare/pharmacy application development, integration support, and production troubleshooting.

• Deliver contract development and application support using .NET 10/C#, SQL, Blazor/Razor, APIs, cloud-connected architecture, and AI-assisted development workflows.
• Design, test, document, and enhance internal frontend/backend applications while supporting API integrations, complex SQL queries/stored procedures, and Tier 2/3 production troubleshooting.
• Collaborate with QA, Infrastructure, CIO/Business Operations, and agile stakeholders on cloud/microservices improvements, support procedures, code reviews, sprint planning, and secure/performance-minded fixes.

Healthcare education, certification, and revenue cycle technology.

• Built scalable web, mobile, and cloud-connected applications using .NET 8/.NET 6, Blazor, Razor, .NET MAUI, Azure B2C, and Azure DevOps pipelines.
• Led Xamarin-to-.NET MAUI migration and coordinated a small engineering team, improving mobile architecture and cross-platform maintainability.

Real-time, event-driven ride operations platform.

• Designed real-time, event-driven ride operations using .NET, EF Core, RabbitMQ, SignalR/WebSockets, Blazor, and .NET MAUI.
• Built cross-platform driver/operator experiences, reusable Blazor components, queue-based communication patterns, and live location workflows.

GenAI product portfolio spanning legal operating systems, agent-native API gateways, and Super RAG architectures on Vertex AI / Google Cloud.

• Architected Lex OS, an AI-powered legal operating system using Gemini/Vertex AI for case analysis, jurisprudence exploration, OCR document intake, evidence panels, per-case workspaces, and administrative controls.
• Built TechForAGI Gateway, an agent-native API gateway for autonomous AI systems to discover services, request quotes, process tasks, and receive structured machine-readable responses.
• Designed a Super RAG architecture combining semantic retrieval, legal-atom/verified-holding concepts, vector indexes, SQL/graph sources, retrieval audits, prompt orchestration, evidence grounding, and Vertex AI RAG patterns.
• Directed AI product decisions around Gemini, Vertex AI / GCP, OpenAI, Claude, tool/function calling, OCR workflows, source attribution, usage metering, latency/cost tracking, and API monetization patterns.

Cloud-hosted HOA and community management SaaS.

• Supported cloud-hosted web and desktop applications with .NET 6/.NET Framework 4.8, Azure infrastructure, agile delivery, and production troubleshooting.

Enterprise contact center and cloud communications applications.

• Delivered enterprise web and desktop applications using C#, ASP.NET, MVC, .NET Core, Entity Framework, SQL Server, RESTful APIs, and Scrum practices.

COVID-19 symptom reporting, WhatsApp teleconsultation, and telehealth platform.

• Led a 125-person technology, health, and marketing team to deliver COVID-19 symptom reporting, WhatsApp teleconsultation, web workflows, Twilio WebRTC video consultations, microservices, and event-driven .NET solutions.

Nationwide banking application infrastructure, DevOps, and backend APIs.

• Managed nationwide application infrastructure, production environments, DevOps culture, Azure Boards/Pipelines/Repos/Tests, Git, Terraform, VMware, SQL Server, IIS, Windows Server, Azure Cloud, and backend banking APIs.

Microfinance banking applications and customer support platforms.

• Built and integrated banking applications, APIs, SQL Server workflows, customer support platforms, SignalR, sockets, WebSockets, REST/SOAP services, and .NET web/desktop solutions.

AI-powered resume processing, scoring, and candidate-job matching using Gemini/Vertex AI, multi-model LLM evaluation, prompt design, structured extraction, and recruiter-facing ranking workflows.

Lex OS uses Gemini/Vertex AI and multi-model LLM workflows for case analysis, jurisprudence exploration, OCR-enabled document intake, evidence panels, per-case workspaces, and administrative controls.

Agent-native API gateway enabling autonomous AI systems to discover services, request quotes, process tasks, and receive structured machine-readable responses.

Founder-led AI/product portfolio and developer mentorship initiatives at techforpeople.org, spanning GenAI applications and community engagement.