Leandro Jackson

Developing enterprise HR software focused on people management, workforce planning, time tracking, vacation management, people analytics, overtime, exit interviews, dashboards, and HR operational workflows.

• Developed enterprise HR modules for employee management, vacation, time tracking, workforce planning, people analytics, overtime, and exit interviews.
• Built backend services using C#, .NET, ASP.NET Core, Entity Framework, DDD, CQRS, and REST APIs.
• Created complex Angular interfaces for dashboards, workflows, approvals, filters, calendars, and business process management.
• Implemented approval flows based on hierarchy levels, access profiles, company scope, cost center scope, and approval steps.
• Developed action-required mechanisms to centralize pending user actions across business domains.
• Worked with PostgreSQL, SQL Server, Oracle, SAP HANA, and external ERP integrations.
• Created and optimized SQL queries, procedures, views, and reporting structures for business analytics.

• C#
• .NET
• ASP.NET Core
• Angular
• TypeScript
• PostgreSQL
• SQL Server
• Oracle
• SAP HANA
• DDD
• CQRS
• REST APIs
• ApexCharts

Short-term part-time contract focused on SAP Business One integrations, third-party systems, Microsoft Teams integrations, Crystal Reports, SAP HANA procedures, and business reporting.

• Developed and maintained backend integration routines using C#, REST APIs, SAP Service Layer, and database scripts.
• Supported integrations between SAP Business One, third-party systems, Microsoft Teams, and operational tools.
• Built and maintained reports, procedures, and data flows to support business operations.
• Worked with Crystal Reports and SAP HANA procedures for enterprise reporting.
• Improved integration reliability through better request flows, data transformation, and error-handling logic.

• C#
• .NET
• SAP Business One
• SAP Service Layer
• SAP HANA
• Crystal Reports
• REST APIs
• Microsoft Teams

Remote work on web and mobile software projects using C#, JavaScript, React, React Native, Android, and iOS technologies.

• Developed and maintained web and mobile applications using C#, JavaScript, React, and React Native.
• Worked with native Android and iOS integrations.
• Participated in mobile app publishing processes.
• Integrated mobile applications with smartwatch SDK features.
• Collaborated with distributed teams in a remote development environment.

• C#
• JavaScript
• React
• React Native
• Android
• iOS
• REST APIs
• Git

Industrial applications, system integrations, legacy system maintenance, and modernization initiatives for enterprise clients.

• Developed industrial applications and enterprise software solutions.
• Maintained and modernized legacy systems.
• Built a React Native application for employee time registration during the COVID-19 pandemic.
• Worked closely with client teams to understand business needs and deliver technical solutions.

• C#
• JavaScript
• React Native
• SQL
• REST APIs

Internal applications for the telecommunications sector — new features, legacy systems, and API development.

• Developed and maintained internal business applications.
• Worked on new features, legacy systems, and API development.
• Supported systems related to administrative and operational processes.
• Performed analysis, troubleshooting, maintenance, and software improvements.

• C#
• .NET
• APIs
• SQL
• Legacy Systems

Support tickets, maintenance, and development for internal enterprise systems related to employee administration, payroll, time tracking, and vacation.

• Supported internal enterprise systems through ticket analysis and issue resolution.
• Developed improvements and new features for employee administration systems.
• Worked with business users to understand issues and implement technical solutions.

• C#
• .NET
• SQL
• Internal Enterprise Systems

Software solutions for people management and corporate processes, with a strong focus on SAP Business One environments, SQL queries, reports, and business applications.

• Developed software solutions for people management and corporate workflows.
• Created reports and customizations for SAP Business One environments.
• Worked with SQL queries and Crystal Reports to support business operations.
• Participated in the development and maintenance of add-ons and enterprise applications.

• SAP Business One
• SQL
• Crystal Reports
• C#
• Enterprise Systems

SQL queries, Crystal Reports development, and maintenance of corporate add-ons for SAP Business One.

• Created SQL queries for business reports.
• Applied SQL queries to Crystal Reports.
• Supported the development of SAP Business One add-ons.
• Assisted in maintaining corporate systems and reporting tools.

• SQL
• Crystal Reports
• SAP Business One
• C#