Leandro Nunes Mazer

Current title: Solution Architect - AI Tech Lead

Current concurrent client assignments: Proximus Belgium (50%) | Vodafone Italy (50%)

Claro Puerto Rico engagement | Brazil

• Led end-to-end solution design and delivery for a US$10M digital transformation program, covering Ordering Capture, Ordering Handling and One Catalog through production deployment.
• Managed and mentored four Business Analysts and Product Owners; partnered with the Program Manager on release planning, prioritization and go-live strategy.
• Led client discussions on solution scope, cost estimates and capacity; governed implementation risks, timelines and delivery commitments.

Brazil

• Managed eight analysts and engineers delivering cloud-based services under strict SLA agreements; improved CSAT from 77% to 98% within two months.
• Managed applications on Google Cloud Platform and implemented Power BI dashboards for service performance and operational decision-making.

Vivo Brazil engagement | Brazil

• Owned incident and problem management for digital platforms serving 80M+ subscribers; led P1/P2 incident coordination, war rooms and executive escalations.
• Drove root cause analysis, preventive action and problem governance; oversaw release control and production change validation across BSS, CRM and ordering systems.

Brazil

• Designed end-to-end enterprise solutions across CRM, ordering and digital platforms with a combined project value of US$4M, contributing to the successful delivery of all initiatives.
• Designed and delivered API security solutions for Vivo Brazil, covering SOAP and REST APIs and translating security requirements into implementation-ready technical designs.
• Led client scoping workshops, produced high-level and detailed designs, and aligned business and delivery teams on integration architecture, performance and operational readiness.

Brazil, Peru, Chile & Colombia

• Led production support for telecom platforms serving 22M+ subscribers, coordinating offshore development teams across Brazil, India, Mexico and Israel.
• Owned defect lifecycle and release coordination; translated on-site business requirements into technical solutions and developed Power BI dashboards for SLA governance.

São Paulo, Brazil

• Supported TMD, a digital-image banking document processing system used by major Brazilian banks, with an average daily financial volume of BRL 1B.
• Developed and maintained PostgreSQL scripts; provided production support, performed QA testing and coordinated release deployments within a Scrum development process.

https://mycommunity.living

• Founded and built a community platform connecting expatriates through local services, events, marketplace and social networking; own product definition, architecture and implementation.
• Built the web platform with Next.js, React and Supabase, cross-platform iOS/Android applications with Capacitor, and subscription and payment workflows with Stripe.

https://mytournup.com

• Built a tennis tournament monitoring and alert platform, integrating Italian federation (FITP) tournament data and asynchronous processing to identify new tournaments.
• Implemented backend services and workers using Python, FastAPI, Celery, Redis and PostgreSQL, with containerized development and deployment using Docker and Render.