Daniel – Java, React, AWS

Global crowdfunding platform powering millions of fundraising campaigns. Handles donation collection, payment processing, campaign reporting, and financial reconciliation at large scale across multiple countries and currencies.

• Developed and maintained backend services supporting donation and payment processing using Kotlin and Java.
• Refactored legacy components on the critical payment path, reducing technical debt while preserving reliability of live financial flows.
• Resolved cross-service data consistency issues in platform integrations to ensure accurate donation tracking and financial reporting.
• Implemented backend changes as part of platform modernization initiatives, ensuring zero downtime on active payment flows.
• Contributed to React-based frontend features supporting campaign management and reporting interfaces.

Internal migration toolset and engine for moving large enterprise customers from on-premises project management systems to cloud infrastructure. Covered data transfer, filter subscription mapping, permission reconstruction, and post-migration validation for high-complexity, large-scale migrations.

• Built internal migration tools for filter subscriptions, dashboards, and RapidViews — directly unblocking multiple large enterprise customers from completing on-premises-to-cloud migrations.
• Implemented fixes for location mapping failures, broken links, and large-scale permission reconstruction affecting tens of thousands of migrated entities.
• Optimized concurrency and batch processing throughput for migration pipelines handling high data volumes.
• Introduced feature flag–controlled rollout to validate migration increments in production with minimal risk.
• Diagnosed and resolved complex production incidents — 0-byte file transfers, cross-space migration failures, filter subscription mapping errors — in collaboration with global engineering and support teams.

B2B logistics platform for freight contracting and shipping label generation, integrated with multiple carriers. Supported high-volume e-commerce shipment operations including carrier selection, label issuance, and delivery tracking.

• Designed and developed scalable microservices for freight contracting and carrier routing logic.
• Built and maintained integrations with major logistics providers for shipping label issuance and shipment status tracking.
• Redesigned a file upload flow using presigned S3 URLs to route large files directly to AWS, eliminating app-server timeout failures and unblocking a critical production pipeline.
• Improved freight contracting workflow reliability, reducing operational failures and integration errors across carrier APIs.

Shipment management platform for a national postal carrier supporting pre-posting for domestic parcels, messaging services, and billing (prepaid and invoiced). Integrated with internal corporate postal systems to enable high-volume, secure shipment workflows.

• Developed and maintained APIs for shipping label issuance, tag generation, and domestic parcel pre-posting.
• Gathered requirements from business stakeholders and translated them into technical specifications for new features.
• Built integrations with internal corporate postal services and third-party carrier systems.
• Maintained existing systems and resolved integration failures to ensure service reliability and uptime.

ERP system for public sector financial management used by Brazilian government institutions. Covered budget planning, revenue and expense control, accounting records, financial reporting, and regulatory compliance.

• Developed and maintained web applications for public accounting workflows including budget planning, revenue tracking, and financial reporting modules.
• Built features in Java and JSF applying OOP principles throughout the development lifecycle.
• Automated administrative processes to reduce manual effort in financial data entry and reporting.
• Integrated with corporate government systems to ensure data accuracy and compliance with public administration regulations.