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Top-Rated Plus Freelancer | Senior .NET Engineer | API Integrations | Legacy Modernization | AI-Assisted Automation I am a Senior Software Engineer with over 20 years of professional experience helping companies modernize legacy systems, build reliable APIs, and integrate complex business platforms. I started my career working with Visual FoxPro and desktop-based enterprise applications, and later transitioned to the .NET ecosystem, where I have spent many years building scalable backend systems using C#, ASP.NET, and SQL Server. This background allows me to work comfortably with both legacy and modern technologies, acting as a bridge between old systems and new architectures. In recent years, I have also incorporated AI-assisted tools and platforms into my workflow to improve automation, data analysis, and development efficiency, including experience with Abacus.AI for AI-driven insights and process optimization. What I specialize in Legacy system modernization (Visual FoxPro, Delphi → .NET / ASP.NET Core) API development and system integrations (REST & SOAP) ERP and HR system integrations (Epicor, ADP, Workday, SAP) Database-driven applications (SQL Server, Oracle, MySQL) Automation and productivity solutions (AutoIT) AI-assisted automation and data analysis How AI adds value to my work AI-assisted development for faster debugging, refactoring, and optimization Using AI tools to improve reporting, data interpretation, and business insights Supporting automation workflows with AI-driven analysis Enhancing legacy systems with modern, intelligent components Recent work highlights Migrated legacy Visual FoxPro applications to C# and ASP.NET with SQL Server backends Integrated payroll and HR platforms (ADP, Workday) with custom ERP systems Designed and implemented RESTful APIs for multi-system environments Applied automation and AI-assisted tools to reduce manual processes Led small development teams on long-term enterprise projects Technical Skills Languages & Frameworks: C# (.NET, ASP.NET, ASP.NET Core, WinForms, WPF), Visual FoxPro, Delphi, Angular, AutoIT, Java Databases: SQL Server (T-SQL), Oracle (PL/SQL), MySQL APIs & Integrations: REST, SOAP, third-party and internal systems Reporting: SSRS, Crystal Reports ERP & Business Systems: Epicor, SAP, ADP, Workday AI & Automation: Abacus.AI, AI-assisted development, automation workflows Tools: SSIS, Inno Setup, InstallShield I am a reliable, detail-oriented professional who values clean code, clear communication, and long-term collaboration. If you need help modernizing a legacy system, integrating APIs, or enhancing your applications with automation and AI-assisted solutions, I’d be glad to work with you.

Systems engineer with a focus on Datacenter, Networking, and Linux, with experience in Infrastructure management and deployment. NVIDIA AI infrastructure certified. Deployed Private Cloud infrastructure, Datacenter Network Design for Multi-tenancy, fault-tolerant design, NIC Bonding, low latency networks, Infiniband and 100+ Gbps networking management, benchmark and architecture. Stack: *Full virtual networking with vSwitches and vRouters *Infiniband management: Subnet Manager, HCA, LID/GID, IPoIB *VLAN, VxLAN, GRE and Overlay tunnels *IPv6 *MP-BGP, EVPN *Firewalling *VPN/OpenVPN/IPSec/WireGuard/Site to Site and Client-Server * VPP/DPDK for 100G VPN and routing *Advanced Linux management: IPTables, Kernel modules, Virtualization, Networking. *Traffic engineering *Advanced StrongSwan IPSec tunnels, XFRM *Cloudstack with Open vSwitch *OpenNebula with Open vSwitch *OpenDaylight SDN controller with OpenvSwitch *Advanced Proxy setup with Squid/Nginx *Virtuozzo and OpenVZ *KVM and Libvirtd / Proxmox *MicroVM Managment / Firecracker *RADIUS and FreeRADIUS *Pacemaker/Corosync/Keepalived HA cluster *MTLS design and implementation with NGINX *IoT gateway implementation with Raspberry Pi and 4G modems *DevOps experience with Chef and Ansible *Bash and Python scripting

For more than 20 years, I have been working Microsoft technologies specifically Windows Server 2000/2003/2008/2012, Microsoft Exchange Server, IIS. My major competency is server configuration, maintenance and troubleshooting: Active directory, GPO, DHCP, DNS, Hyper-v, I have worked as a System Administrator both for Windows & Linux. I am VCP5, MCP, MCSA, Network+ Installed & Configured Microsoft Exchange 2010 Migrated 800 Mailboxes from M. Exchange 2003 to Microsoft Exchange 2010 Migrateed Sysaid (SysAid: ITSM, Help Desk Software, Ticketing System) from Windows to Linux Centos Migrated Platform from Windows 2003 to Windows 2008 r2 sp1 Installed & Configure & Manage Vcenter/Vmware Esxi 5.5 Migrated from physical to Virtual of the Services. Implemented AD+DNS+DHCP+ on Windows 2008 r2 sp1 Install & Configure Centos/Apache & LAMP (Linux-Apache-Mysql-Php) stack (vhost) for the Gov. Installed & Configured Fortigate 600D UTM Install & Configure Storage Area Network (SAN) for the Virtual Environment (HP MSA, DELL SC4020, NetApp) Implement Esxi Best Practice Data Recovery of Critical Data Installed & Configured Microsoft Sql Server 2014 for Project Managed DNS Server/Cloudflare House Monitored and Improved Security Installed & Configured & Manage Nagios On Ubuntu Installed & Configured & Manage FileServer Installed & Configured Load balancers for Web Server Installed & Configured & Manage VPN Services

I am a native Italian speaker and have been living in the Dominican Republic since 2009. I have an excellent command of the Italian language and sometimes I teach it. I have excellent computer skills thanks to the fact that I have worked as an IT professional for more than 20 years. I currently work as a freelancer on translations, transcriptions, revisions, voice services and subtitles from/to English, Spanish and Italian. I am a meticulous person, and I will not disappoint your expectations!

I can install and configure your Dedicated Server or VPS, Virtualize or perform any other service on Linux or Windows that you request. I make initial configurations from scratch of any kind on physical, dedicated and Virtual Servers such as; Installations, Updates, Optimizations, Migrations, Backups, Monitoring, Load balancing, DNS, VestaCP, ISPConfig, Plesk, WHM / cPanel, DirectAdmin, Security, Wordpress, Anti-Dos Protection, Anti-DDoS, Anti-Slowloris, Anti-Flooding among others such as Virtualizations of any kind and more. Linux A to Z Configuration, Management & Troubleshooting. More of 10 years in production. Specialization: OS Platform: Centos, Ubuntu, Debian, Redhat and more. Virtualization: OpenVZ, KVM, XEN and related. Control Panel: cPanel, DirectAdmin, VestaCP, ISPConfig, Plesk, Kloxo and more. Firewall: Linux iptables, CSF, UFW and related. Network Protocols: TCP/IP, IPv6 Network Services & Servers: Apache, nginx, php-fpm, proftpd/vsftpd, MySQL/MariaDB, postfix and others System and software Configuration, Installation, Optimization, Server Hardening I am open and honest, if I feel I am unqualified, I will not go any further without discussion, and I work well coordinating with others. I am hard-working and have a high sense of responsibility.

Hi, I’m Rafael 👋 I’ve been working in IT and support for 8+ years, with a strong focus on Linux system administration and help desk support. I’ve worked with small businesses as well as production servers, making sure systems stay online, secure, and efficient. Most of my day-to-day experience has been with CentOS, cPanel, Interworx, Apache, MySQL/MariaDB, PHP, DNS, Exim, Dovecot, FTP, SSH, CSF, and WordPress. I also have hands-on experience with Plesk servers, LiteSpeed, Joomla, Drupal, and Magento. On the database side, I’m comfortable with Oracle SQL: writing queries, creating indexes, and handling database management tasks. Beyond that, I know my way around GNU/Linux Red Hat systems: service administration, task scheduling, backups, disk management, and permissions. I’m bilingual (English and Spanish), used to working directly with clients over tickets, live chat, and calls. My goal is always the same: solve problems quickly, keep things running smoothly, and make life easier for the client. If you’re looking for someone reliable, technical, and easy to work with, I’d be glad to help.