Edgardo Nuevo

Designed and implemented a Java/Spring Boot middleware orchestrating Zoho APIs and OSE EFACT to automate electronic invoices, credit notes, and shipping guides under UBL 2.1. Achieved 100% SUNAT compliance with preventive master-data validation and retries, reducing rejection rates by ~40%.

Built a Java 21/Spring Boot batch engine to ingest, validate (UBL 2.1), and route invoices via email, achieving 95% straight-through processing. Developed REST microservices to integrate bidirectionally with SAP ECC via synchronous/asynchronous RFC calls and synchronized payment status.

Led migration of legacy ASP.NET Web Forms logic to a service-oriented architecture in C#.NET 4.8 using Repository/Service Layer patterns. Optimized 15+ Oracle 11g SQL queries, reducing latency from 4.2s to 1.3s (-70%).

Designed a Java 21/Spring Boot REST service for real-time CAVALI invoice queries integrated with SAP ECC via RFC, reaching 99.8% production availability. Implemented financial validation across CAVALI, SAP purchase orders, and payment deadlines with resilience patterns and traceable audit logging.

Architected backend for electoral process management across 300+ organizations on .NET Framework 4.8 and Oracle 11g, using temporal domain modeling to preserve historical integrity. Secured the module by mitigating OWASP Top 10 issues and aligning with ISO 27001 without breaking existing compatibility.

Refactored an occupational safety search engine in Spring Boot 1.5.8 with JPA/Hibernate, implementing dynamic criteria to reduce response times from 3.5s to under 800ms. Built multi-level RBAC using SQL Server stored procedures and optimized audit/month-end reports to cut CPU consumption by 35%.

Built a Java EE 1.7 batch application using JavaMail to poll a corporate mailbox and process 500+ documents/month with a 90% automation rate. Implemented a rule-based validation engine (amounts, RUC, UBL) with SAP RFC/JCo 3.0 integration and automatic rollback for transactional errors, deploying on RHEL 7 with systemd/cron and Log4j2 auditing.

Contributed to refactoring a monolith into Spring Boot microservices using Java 8, decoupling business logic and improving scalability. Collaborated on REST contract definitions and persistence layer implementation to enable future external integrations.

Developed backend functionality for procedural status management, parameterized searches, and change auditing using Java 8, Spring Framework 4.0, and MyBatis. Optimized Sybase SQL queries and applied best practices to improve maintainability and performance.

Implemented C#.NET backend logic for service scheduling queries, status registration, and pre-liquidation of payments to tourism suppliers. Built SOAP/REST web services and optimized PL/SQL data persistence in Oracle 11g.

Developed C# web services for sending and querying electronic withholdings to SUNAT/TCI, leading certification testing and successful production deployment. Implemented SOAP/XML integration supporting fiscal homologation requirements.