Geilton Xavier

Solutions Architect · Staff Engineer · Technical Lead · .NET · Azure · Distributed Systems

[email protected] | +351 910 702 889 | linkedin.com/in/geiltonxavier

Summary

Software engineer with 10+ years building high-scale distributed systems on .NET and Azure. Currently at Siemens as a hands-on Solutions Architect and Technical Lead, designing enterprise platforms that integrate Dynamics CRM, SAP, Salesforce, and ServiceNow — with a projected $1M+ in annual operational savings.

I operate as a force multiplier: led technical standardization across 300+ engineers, designed Internal Developer Platforms adopted by 70+ projects, and built cross-cutting influence in architecture decisions beyond my immediate team.

Experience

Solutions Architect & Technical Lead · Siemens Smart Infrastructure

Dec 2024 – Present · Lisbon, Portugal

  • Architected a centralized User Management platform integrating Dynamics CRM, SAP, Salesforce, and ServiceNow — from zero to global production — with a projected $1M+ in annual operational cost savings.
  • Designed an employee lifecycle system with automated global onboarding/offboarding across multiple regions.
  • Established an AI-assisted development workflow using Specification-Driven Development (SDD) and GitHub Copilot Agents.
  • Led architecture decisions, technical reviews, and engineer mentorship.

Stack: .NET, Azure, Microservices, DDD, TDD, Bicep/ARM, GitHub Copilot Agents, Azure Monitor.

Senior Staff Software Engineer · Novabase (embedded at Fidelidade Seguros)

Apr 2021 – Nov 2024 · Lisbon, Portugal

  • Led technical standardization across 17+ delivery teams and 300+ engineers.
  • Designed and delivered an Internal Developer Platform adopted by 70+ projects, reducing new project setup time by ~60%.
  • Built an AI-powered issue analysis system (Jira + Azure OpenAI) that reduced manual analysis by 70% for 300+ developers.
  • Developed a security analysis system covering 5,000+ projects.

Stack: .NET, Azure, Kubernetes, Docker, Azure OpenAI, Prompt Engineering, Kibana.

Senior Software Engineer · agap2-IT (embedded at SoftFinança)

Jan 2020 – Mar 2021 · Lisbon, Portugal

  • Designed the initial architecture of a pharmacy marketplace platform using Clean Architecture.
  • Reduced API latency by 40% and peak database CPU usage by refactoring LINQ compositions.

Stack: .NET Core, C#, Clean Architecture, LINQ, Web API, WCF, SQL Server.

Senior Software Engineer · Mttechne (embedded at Ticket/Edenred)

Jul 2019 – Dec 2019 · São Paulo, Brazil

  • Contributed to an event-driven Transaction HUB processing 900K transactions/day at 99.9% availability.

Stack: .NET Core, Microservices, Event-Driven Architecture, DDD, TDD, RabbitMQ.

Senior Software Engineer · Vizir Software Studio

Sep 2017 – Jul 2019 · São Paulo, Brazil

  • Built a global onboarding platform for Natura with payment gateway integrations.
  • Designed a cloud-native multi-tenant B2B loyalty platform for enterprise clients including Nestlé and Vivo.

Stack: .NET Core, Node.js, AWS Lambda, API Gateway, SQS, Docker, Kubernetes, RabbitMQ, Oracle.

Early Career (2012–2017) · Eris, FCamara, Confitec, Prodesp, Vizir, Deal

Brazil

Enterprise-scale systems (ERP, financial, energy) for public and private sectors. Strong foundations in distributed services, async messaging, and cloud-native migrations.

Skills

  • Architecture: .NET, Microservices, DDD, CQRS, Clean Architecture, TDD, Event-Driven.
  • Cloud & Platform: Azure (Functions, SQL, Monitor, OpenAI), AWS, Kubernetes, Docker.
  • DevOps & Data: CI/CD, Observability, RabbitMQ, Kafka, SQL Server, Oracle.
  • AI & Tooling: Azure OpenAI, Prompt Engineering, GitHub Copilot Agents, SDD.

Education & Certifications

  • M.Sc. Computer Engineering · University of Évora, Portugal · 2025 – In progress
  • B.Tech. Systems Analysis & Development · Universidade Cruzeiro do Sul · 2013–2015
  • Microsoft Certified: Azure Developer Associate (AZ-204)
  • IEEE Senior Member