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Open to lead roles & AI consulting
Ruben
Martinez Tanahara
Senior .NET / Azure Engineer & Applied AI Architect
I design cloud-native systems on .NET and Azure, and build LLM products that stay secure, observable and bounded by permissions, from the tool layer to the billing meter.
01Approach
Engineering that survives contact with production.
“Models are a dependency like any other: behind clear boundaries, observable, and bounded by permissions.”
- 01
Boundaries first
Clean Architecture with dependency rules enforced by tests that fail the build, so the design survives the next ten engineers.
- 02
Observable by default
Dashboards, alerts and structured logging are part of the feature: New Relic, KQL/NRQL, Serilog.
- 03
AI with guardrails
Every LLM tool is permissioned per user and per company, and every token is metered.
- years shipping production systems on .NET, Azure and GCP
- 5+
- engineers led as Technical Lead at Apex Systems
- 10
- users on the Gemini-powered ERP assistant I built
- 100+
- certifications across Azure, AWS, GitHub and SAFe
- 8
02Experience
8 roles, one through-line.
- Jun 2026 - Jan 202701
Freelance AI Engineer Solutions
Freelance
AI Engineer
Freelance AI Engineer for a conversational AI assistant embedded in an ERP, serving 100+ users, within a 15-person engineering team.
- Developed the backend of a conversational AI assistant using Google Vertex AI (Gemini) with function calling to query inventory, sales, and collections data in MySQL, returning streamed responses and charts.
- Designed the LLM tool layer and AI orchestration: client-configurable prompts, per-user and per-company access control for every tool, and token-based usage metering for billing.
- .NET 10
- C#
- ASP.NET Core Minimal APIs (Carter)
- Clean Architecture
- NetArchTest
- Google Vertex AI (Gemini)
- +17
- May 2026 - PresentNow
Apex Systems
Remote, Mexico
Technical Lead, .NET / Azure
Technical Lead for a 10-engineer team building cloud-native microservices for an enterprise healthcare logistics platform, using C#, .NET 8/.NET 10, Azure Functions, Durable Functions, SQL Server, and Azure DevOps.
- Lead a 10-engineer team as Technical Lead (promoted May 2026): own architecture decisions, delivery planning, and weekly leadership meetings in a SAFe Agile environment.
- Architected a claims processing platform with Azure AI Document Intelligence (OCR), Durable Functions SLA timers, and a Strategy-pattern reconciliation engine for invoices and receipts; produced six sets of system design diagrams.
- C#
- .NET 8/10
- Azure Functions
- Durable Functions
- Azure AI Document Intelligence
- Azure DevOps
- +8
- September 202503
Gleam.mx
Freelance
Flutter Developer (Mobile Frontend)
Developed the mobile e-commerce frontend in Flutter and Dart, with state management in Riverpod.
- Implemented responsive UI layouts from design specifications and integrated REST APIs with Dio.
- Added Stripe payments (Flutter Stripe), secure token storage (Flutter Secure Storage), and cached image loading.
- Flutter
- Dart
- Riverpod
- Dio
- Flutter Secure Storage
- Cached Network Image
- +4
- Oct 2024 - May 202604
Apex Systems
Remote, Mexico
Senior Software Engineer
Developed cloud-native microservices for an enterprise healthcare logistics platform using C#, .NET 8, Azure Functions, Redis, and SQL Server.
- Built distributed services on Azure and delivered them through Azure DevOps CI/CD pipelines in an Agile/SAFe team.
- Performed code reviews as a senior engineer on the team.
- C#
- .NET 8
- Azure Functions
- Azure DevOps
- Redis
- SQL Server
- +3
- May 2024 - Oct 202405
Mozart Net
Full-time
Lead Software Engineer (.NET)
Lead Software Engineer for a two-engineer team building an offline-first Android warehouse management application and its .NET backend.
- Led development of a high-performance Android warehouse management application (Kotlin, Jetpack Compose) supporting thousands of concurrent operations, covering inventory management, barcode scanning, and label printing.
- Implemented offline-first operation with data synchronization so warehouse staff could keep working without connectivity and sync changes to the backend once reconnected.
- C#
- .NET 8
- Kotlin
- Android Development
- Jetpack Compose
- Entity Framework
- +9
- May 202406
Trippii
Freelance
React Native Frontend Developer
Developed a cross-platform travel application frontend with React Native and TypeScript.
- Integrated Supabase for real-time backend operations and REST APIs.
- Implemented interactive maps with Mapbox and dynamic image content from the Pexels API.
- React Native
- TypeScript
- JavaScript
- Supabase
- Mapbox
- Pexels API
- +3
- Jul 2023 - May 202407
GDL Connect
Full-time
Software Engineer (Full Stack/Nearshore)
Full-stack engineer in a two-person team building a mortgage CRM platform for U.S.-based clients on the MERN stack.
- Designed and developed a mortgage CRM system for U.S.-based clients on the MERN stack (MongoDB, Express.js, React, Node.js) using TypeScript, covering lead management, document management, loan pipeline tracking, and reporting.
- Built microservices with Node.js and Express.js, including user authentication and real-time features over WebSockets.
- JavaScript
- TypeScript
- MongoDB
- Express.js
- React
- Node.js
- +8
- Jun 2021 - Jul 202308
Infotek
Full-time
.NET Developer (Full Stack)
Developed multiple modules of an ERP system for a client's proprietary SaaS platform using C# and the .NET Framework 4.8 stack.
- Built Windows Forms user interfaces and implemented data access with Entity Framework against SQL Server.
- Contributed to Agile ceremonies and delivered enterprise software.
- C#
- .NET Framework 4.8
- Windows Forms
- Entity Framework
- SQL Server
- Agile Development
Responsibilities, stacks and dates for every role, in one page.
Full history (PDF)
03Capabilities
From the database to the model, one architecture.
Programming Languages
- C#
- JavaScript/TypeScript
- Python
- Rust
- Dart
Frontend
- React
- Next.js
- React Native
- Flutter
- Jetpack Compose
Backend
- ASP.NET Core
- Minimal APIs (Carter)
- Node.js
- Express.js
- NestJS
- FastAPI
AI Engineering
- Microsoft Foundry
- Google Vertex AI (Gemini)
- Function Calling / Tools
- Model Context Protocol
Databases
- SQL Server
- MySQL
- Dapper
- MongoDB
- Redis
- Azure Cosmos DB
Cloud & DevOps
- Microsoft Azure
- Google Cloud Platform
- Amazon Web Services
- Fly.io
- Docker
- GitHub Actions
- Sentry
How I lead
Agile Methodologies
Scrum Framework, SAFe Principles
Team Collaboration
Code Reviews, Mentoring, Pair Programming
Communication
Technical Documentation, Stakeholder Alignment, Client Presentations
Leadership
Team Leadership, Project Management, Problem Solving, Continuous Learning
04Selected work
Designed, built and shipped end to end.
in beta · waitlist open
Mapplo
Learn every country, capital & flag the fun way.
Five minutes a day turns world geography into a daily habit. Bite-size quizzes, an offline atlas, and streaks that keep curious minds, students, and trivia buffs coming back.
- React Native
- Expo
- TypeScript
- Vercel
05Credentials
Verified, not just claimed.
Microsoft Certified: Azure FundamentalsMicrosoft · AZ-900- Microsoft Certified: Azure AI FundamentalsMicrosoft · AI-901
- MTA: Software Development FundamentalsMicrosoft · MTA
AWS Certified Cloud PractitionerAmazon Web Services · CLF-C02- Azure AI: Machine Learning FundamentalsSkillsoft · Skillsoft
CiberseguridadCoderhouse · Coderhouse
GitHub CopilotMicrosoft · GH-300
SAFe 6.0 AgilistScaled Agile, Inc. · SAFe 6.0
06Contact
A system that has to scale, or an AI product that has to behave? Let's talk.
Hiring for a senior or lead role, or scoping AI consulting work? Tell me about the problem and the constraints around it.
ruben.mtz.tanahara@outlook.com