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YAGO FELLIPE

@yagofellipe

Message

Java backend engineer at Linx / TOTVS who cut authentication latency 50% across 10,000+ POS terminals.

Brazil

Message

What I'm looking for

I'm open to remote roles in e-invoicing, ELR, or compliance platforms.

At Linx / TOTVS, I work on production e-invoicing at the point of sale. I shipped an 8-schema XSD migration for a government-mandated tax ID with zero production regressions, and stopped SEFAZ XML rejections by isolating sanitization to the transmission layer.

I also cut authentication latency 50% across 10,000+ live POS terminals with a concurrency-safe cache, including contingency-mode issuance. On my Till project, I built a POS double-entry ledger with fiscal contingency and idempotent transfers.

Experience

Work history, roles, and key accomplishments

Current

Java Backend Engineer

Current

Linx / TOTVS

Nov 2025 - Present (11 months)

Stopped tax-authority XML rejections by isolating sanitization to the transmission layer and shipped an 8-schema XSD migration with zero production regressions. Cut authentication latency 50% on 10,000+ POS terminals with a concurrency-safe cache and extracted online/offline authorization into a dedicated service.

Java SEFAZ XML XSD Notas Técnicas POS Concurrency Caching Azure DevOps Junit CI CD

Java Developer Intern

RioCardTI

Jul 2024 - Nov 2025 (1 year 4 months)

Wrote Spring MVC/Security/JPA APIs with JWT for high-volume transit traffic and migrated Spring Batch jobs from DB2 to Oracle without breaking critical processing. Automated build/test/deploy with GitLab CI, AWS Pipeline, and ArgoCD.