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Guilherme Vieira

@guilhermevieira

Senior Software Engineer at Taller on Microsoft CELA AI workflows, contributing to RAG pipelines for legal and operational processes.

Brazil

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At Taller, I work on an international engagement with Microsoft CELA, contributing to AI-enabled internal solutions for legal workflows, operational efficiency, and enterprise productivity. I build and evolve .NET and Azure solutions and contribute to Retrieval-Augmented Generation pipelines.

At Xp Inc., I evolved the custody transfer ecosystem through operational transformation initiatives, delivering more than 10 modernization initiatives. I also led engineering teams and supported critical, regulated systems, including work with audits involving ANBIMA and CVM.

At Flash, I developed and evolved corporate expense management solutions across requirements, architecture, implementation, and production monitoring. I also helped reduce SLA and average incident resolution time and supported workflows connecting expenses, travel, and benefits.

Earlier, at ExpenseOn, I worked on corporate expense management services and microservices, first as a Senior Software Engineer and then as a Senior Tech Lead. At Systh Sistemas e Tecnologia, I worked on ERP software covering tax modules, inventory, finance, billing, and third-party integrations.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer | .NET, Azure & AI Workflows | Microsoft CELA Engagemen

Current

Taller

Mar 2026 - Present (7 months)

Working through Taller in an international engagement with Microsoft CELA, contributing to AI-enabled internal solutions focused on operational efficiency, enterprise productivity, and legal workflows.

Key contributions:

• Build and evolve backend and full-stack solutions using .NET and Azure for enterprise AI initiatives
• Contribute to the design and evolution of Retrieval-Augmented Generation

Engineering Manager

Xp Inc.

Sep 2024 - Mar 2026 (1 year 6 months)

Responsible for evolving the custody transfer ecosystem, leading operational digital transformation initiatives focused on reducing manual processes, strengthening governance, and improving process reliability.

Worked in critical and regulated environments, actively participating in architectural decisions, supporting high-performance systems, and managing audits with regulatory entities such as

Senior Tech Lead

Flash

Aug 2022 - Aug 2024 (2 years)

Responsible for developing and evolving corporate expense management solutions, working across the full lifecycle from requirements definition and architecture design to implementation, monitoring, and continuous improvement.

Actively participated in product decisions and business rules, supporting integration between operational and customer support areas and improving incident management proces

Senior Tech Lead

ExpenseOn

May 2020 - Aug 2022 (2 years 3 months)

Responsible for maintaining the essential services of the corporate expense management application, leading the technical team, maintaining OKRs, providing technical feedback, reviewing new features, 1:1 meetings, and supporting the management of other ecosystem microservices. Monitoring and managing the backlog, preparing new features, creating UML diagrams for new epics, and participating in str

Senior Software Engineer

ExpenseOn

Dec 2018 - May 2020 (1 year 5 months)

Responsible for maintaining the project and web solutions for corporate expense management. Involvement in problem-solving, technical discussions, and new features; unit testing and monitoring. Support in spreading culture and implementing microservices.

System Analyst | Project Manager

Systh Sistemas e Tecnologia

Jul 2014 - Dec 2018 (4 years 5 months)

Responsible from gathering inputs to final delivery, maintenance, training, and occasionally, on-site consulting and implementation.
Development of ERP software, with emphasis on national and international tax modules, inventory, finance, billing, and integrations with third parties.
Support in strategic decision-making with decisions also at the product level, contributing to usability and delive