William Macero

Led ABAP development for SAP implementations and continuity projects across various modules (FI, MM, SD, PP, HR). Created custom programs, reports (ALV), forms (SmartForms, Sapscrips), and utilized enhancement techniques (Badi’s, Enhancement Point, Field Exits) to meet client requirements. Integrated SAP with external systems using IDOCs, Proxy Services, and Web Services, including Fiori and OData

Worked as a freelance ABAP developer on S/4 Hana migration projects, focusing on transitioning processes from Web Dynpro to Fiori. Developed OData services, RFCs, and custom reports and tables (Z) for clients in the automotive and construction industries. Implemented solutions for invoice workflow monitoring, digital signature integration, and user self-management within the SAP environment.

Contributed as an ABAP developer to an S/4 Hana migration project for a retail client. Developed OData services to support the functionality of a new Supplier Portal. Applied technical expertise to ensure seamless data flow and integration within the updated SAP landscape.

Served as an ABAP developer, primarily focusing on adapting SAP systems for CFDI 4.0 electronic invoicing requirements. Integrated SAP with external PACs using REST services and TXT file formats. Participated in an S/4 Hana implementation, applying SAP notes, adjusting Z programs, and utilizing User Exits, Enhancement Points, and BADI's to customize business processes.

Worked as a freelance ABAP developer on an S/4 Hana migration project. Applied ATC notes, adjusted migrated programs, and created new Z programs based on business requirements. Implemented BTE's for process modeling and performed adjustments related to LTMOM for data migration activities.

Provided freelance ABAP development services for multiple manufacturing clients, specializing in electronic invoicing projects (Facturación Electrónica). Generated SPROXY classes based on SOAMANAGER services to consume Web Services for data collection and invoice generation. Developed monitor programs and implemented logic for updating electronic invoice statuses.

Developed ABAP solutions for SAP implementations and rollouts across various modules (HCM, BW, MM, SD, PM, FI). Created custom reports (ALV), forms (Smartforms), and utilized enhancement techniques (Enhancement Point, Badi’s, User Exits). Implemented Fiori applications using OData services and integrated processes via BAPIS and function modules.

Developed custom ABAP solutions for clients in construction and pharmaceuticals, focusing on HCM, AA, and CO modules. Created Dynpros, ALV reports, and payroll functions, including validations and print programs. Implemented interfaces for master data and cost extraction, and provided continuity support using Enhancement Point, Badi’s, Field Exits, and Z developments.

Developed ABAP interfaces between SAP ECC and external systems (XIUS) using PI Web Services and flat files for a telecommunications client. Created Dynpros and ALV reports for logistics management, including handling deliveries, notices, transfers, and serials via BAPI's and custom function modules. Consolidated data and generated reports for interface monitoring.

Provided ABAP development and continuity support for a pharmaceutical client in SAP ECC across multiple modules (FI, MM, SD, PM, HCM). Created ALV reports, SmartForms, Sapscrips, and Dynpros, utilizing enhancement techniques (Enhancement Point, Field Exits, User Exit) and Z objects. Developed a Modulepool application for Goods Receipt management, including Z tables and ALV Tree View.

Developed ABAP solutions for a pharmaceutical client in SAP ECC, focusing on continuity operations and specific projects. Created ALV reports, mass data update programs (BAPIS, Bach Input), and utilized standard functions for file handling and email integration. Implemented enhancements using Enhancement Point, Field Exits, and BADIS, and developed custom Z objects and solutions.

Served as a Database Administrator, responsible for the maintenance and performance of Oracle and MS SQL Server databases. Managed database replication, backups, and optimized performance through index review and tuning. Developed database objects including views, tables, triggers, stored procedures, and functions using Transac SQL.

Worked as a freelance ABAP developer providing continuity support for an electrical client in SAP ECC. Adapted existing transactions and utilized BAPIS to facilitate the loading of projects based on customer orders within the CJ20N transaction. Ensured system functionality and data integrity for project management processes.

Performed Database Administration duties, focusing on Oracle and MS SQL Server environments. Key responsibilities included reviewing indexes, managing database replication and backups, and creating views and tables. Optimized database performance and developed database logic using triggers, stored procedures, functions, and Transac SQL.

Worked as a Systems Consultant and Database Administrator, involved in implementing administrative systems. Managed database operations for Oracle and MS SQL Server, including index review, backups, and creating views and tables. Developed database programs using triggers, stored procedures, functions, and Transac SQL to support system functionality.