Mexican Mom
A cross-platform Agent Skills plugin that gives coding agents a rigorously tested engineering-discipline layer with a distinct Mexican-mom voice.
Loading…
Software Engineer II · Microsoft
Miguel Casillas
I build AI-powered, distributed systems — services that stay fast, scalable, and observable as they grow.
Builder by day, open-mic by night.
Open to conversations about senior backend, platform, and AI-infrastructure opportunities.
Career
Experience
Software Engineer II · MicrosoftAI Messaging & Campaign Insights
2024 – Present · Redmond, WA- Built an MCP server that gives agentic solutions access to content suggestions and campaign insights across multiple data sources and APIs.
- Delivered explainability pipelines for model-driven content insights and campaign diagnostics, with end-to-end telemetry, dashboards, and partner-facing documentation.
- Modernized CI/CD to YAML pipelines with artifact signing, secret scanning, production-branch triggers, gated approvals, and compliance checks.
C# · TypeScript · MCP · Azure DevOps
Software Engineer · MicrosoftCampaign Platform
2022 – 2024 · Redmond, WA- Completed a migration for a campaign-metadata portal that supports campaign-ID creation across Microsoft products.
- Integrated Exchange email delivery for commercial campaigns with Microsoft and external partners.
- Automated creation and updates of data consumed by the campaign-metadata portal.
C# · Azure · Exchange
Software Engineer · MicrosoftOutlook Scheduling
2019 – 2022 · Redmond, WA- Contributed to the general-availability release of a scheduling service for enterprise customers.
- Decoupled scheduling services to expose reusable APIs for other Outlook products.
- Improved algorithms in a time-suggestions API used by Outlook Mobile on iOS and web, and added flexible working-hours support to the Find Meeting Times API.
C# · REST APIs
Software Engineer · MicrosoftTelemetry SDKs
2018 – 2019 · Redmond, WA- Migrated SDK build systems for new platforms and processors, enabling partners such as Defender to adopt a new SDK version.
- Built an Objective-C wrapper around a C++ SDK for partner teams on Mac.
- Implemented diagnostic-level filtering and improved the C# wrapper used to send telemetry through the C++ layer.
C++ · Objective-C · C#
Download résumé (PDF)
Resume updated August 2026
Work
Selected Projects
Thwiply
An Android v1 scaffold for downloading a device-held model and trying streamed, on-device LLM inference from a debug screen.
TuringAgent
A local-first AI orchestration platform — a Flutter client and Go gRPC backend that run a private assistant stack with model routing, streaming, MCP tools, and approval-gated actions.
Engineering approach
How I work
A few evidence-backed habits behind the systems and project work above.
Make the seams explicit
I make responsibility and interfaces clear. TuringAgent separates its orchestrator, agent runtime, MCP services, and client.
Evidence
- TuringAgent architecture opens in a new tab
TuringAgent splits ownership across the orchestrator, agent runtime, MCP services, and client.
Keep a human gate on state changes
I keep automated writes reviewable: TuringAgent's sandboxed file mutations wait for a user approval bound to the requested tool and arguments.
Evidence
- Approval-gated file tools opens in a new tab
Sandboxed file changes require approval bound to the requested tool and arguments.
Treat operational clarity as a feature
I give runtime state a place to be inspected. TuringAgent records events and audit state; my telemetry note starts with the error and dependency questions an engineer needs answered.
Evidence
- TuringAgent runtime opens in a new tab
The orchestrator owns events and audit records for each run.
- Telemetry note
It starts from error rate by route and slow dependencies.
Write things down for the handoff
In cross-team platform work, I’ve contributed reusable APIs, migrations, and partner-facing documentation. Separately, TuringAgent publishes its architecture, security model, and verification steps.
Evidence
- Microsoft résumé
Reusable APIs, large migrations, and partner-facing documentation from Microsoft platform work.
- TuringAgent docs and checks opens in a new tab
Architecture, security, and a test/build/smoke verification matrix live with the project.
Toolkit
Skills
Languages
C#TypeScriptGoC++JavaScriptSQL
Backend & APIs
.NETNode.jsgRPCREST APIsDistributed systemsMicroservices
AI & agents
LLM & agent toolingMCPOllamaModel routing
Cloud & infra
AzureDockerCI/CDFly.io
Data & observability
PostgreSQLDrizzle ORMTelemetryObservability
Frontend
ReactNext.jsTailwind CSSFlutter
Writing
Latest posts
May 20, 2026 · 1 min read
Grounding agents in real data
Why retrieval beats prompt-stuffing, and a pattern for wiring tools to an agent without losing the plot.
April 2, 2026 · 1 min read
Telemetry that engineers actually read
Dashboards age fast. A few habits that keep observability useful past week one.
About
Builder, lifter, occasional comedian
I'm a Software Engineer II at Microsoft in Redmond. I'm passionate about AI-powered systems, distributed systems, data-grounded analytics, and observability — building services that stay fast, scalable, and understandable as they grow. Since joining Microsoft in 2018, I've shipped across telemetry SDKs, calendar & scheduling, and large-scale messaging and campaign platforms. Computer Engineering, ITAM.
Off the clock I'm at the gym, deep in a movie or TV rabbit hole, or out at an open mic.
🏋️ Lifting🎬 Movies & TV🕷️ Spider-Man (huge)
Turing photo 1 of 3
