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I help businesses secure and optimize Linux infrastructure, firewalls, VPNs and virtualization environments. Specialized in: Network & Security: OPNsense | pfSense | Wazuh SIEM Wireless & Infrastructure: Ubiquiti UniFi Ecosystem Virtualization & Backup: Proxmox VE | Proxmox Backup Server VPN & Connectivity: WireGuard | OpenVPN | Cloudflare Tunnel SysAdmin & DevOps: Linux Servers | Docker | Reverse Proxy Core Services: Network Troubleshooting | Infrastructure Hardening I work mainly with: VPN issues Firewall configuration Secure remote access Reverse proxy problems Linux server deployments Monitoring and log analysis High availability environments I focus on fast troubleshooting, security best practices and stable infrastructure delivery. If you need someone to solve infrastructure and security problems quickly and professionally, let’s talk.

Over 7 years of dedicated experience as a Linux administrator. Proficient in working on projects and expertly troubleshooting/managing various aspects, including: Linux distributions: Debian, Ubuntu, CentOS, AlmaLinux. Virtualization technologies: VMware, Proxmox, Xenserver, KVM/Libvirt. Hosting environments: WHM/cPanel. Cloud services: AWS EC2, RDS, S3, and Route 53. Network services expertise includes: DNS management: Record configuration, zone transfers, security enhancements (SPF, DKIM, DMARK) to ensure mail servers send/receive mail without triggering spam filters. VPN setup: Efficiently establish, manage, and troubleshoot OpenVPN and IPsec configurations. Mail server setup: Proficient in configuring Exim or Postfix, Dovecot, and MX records. Linux services mastery: Skilled in managing BIND9, Exim4, Postfix, Dovecot, OpenVPN, Squid, Apache2, Nginx, and Samba4. Proficient in deploying iptables and various packages for effective firewalling. Scripting capabilities: Adept with both Bash and Python scripting languages. Network troubleshooting: Skilled in using tools like Wireshark, TCPdump, and others for accurate diagnosis. Firewalls proficiency: Expertise with SonicWall, Sophos, FortiGate, NethServer, PfSense, and MikroTik. SSL certificates management: Able to generate certificates using Let's Encrypt and effectively manage them with Certbot. SSH hardening: Proficient in generating public/private keys for SSH and fine-tuning configurations. Users/groups management: Skilled in efficiently managing user accounts, groups, and permissions. Linux clusters: Competent in setting up and managing Linux clusters. Storage management: Experienced in managing storage with LVM technology.

I am an experienced System Administrator, DevOps Engineer, and Blockchain Engineer with a strong background in server setup, maintenance, networking, security, backup & recovery, monitoring, performance optimization, troubleshooting, and automation. I work daily with the latest open-source technologies across various Linux distributions and cloud environments, ensuring high availability, scalability, and security for mission-critical systems. Core Expertise: • Blockchain Engineering: Design, deployment, and maintenance of blockchain nodes, validators, and supporting infrastructure. Optimization, monitoring, and security hardening of blockchain-related services. • DevOps: Automation with Ansible, CI/CD pipelines, infrastructure as code, and container orchestration. • Cloud: Google Cloud Platform (GCP) infrastructure design, deployment, and optimization. • Version Control: Git workflows and repository management (GitHub). • Linux Distributions: Debian, Ubuntu, Red Hat, Clear Linux. • Network Services: DNS, HTTP, VPN (OpenVPN), Nginx, DHCP, Samba. • Networking: IP tools, routing, firewalls. • Scripting & Automation: Bash, Zsh, Python. • Virtualization & Clustering: Kubernetes, LXD/LXC, Docker. Certifications: • LPIC-2 Certified Linux Engineer I specialize in delivering secure, high-performance, and reliable infrastructure solutions for businesses, with a proven track record in blockchain infrastructure management and open-source systems administration.

My job is to technically help startups with promising business models to overgrow and to support startups that have problems with their systems to stabilize and be able to overgrow. Some examples: Rock Real Estate Investments Joyz Donations. ABS Telemetry Bora Transport Iplenix Internet Services - Founder Terra Networks Brasil SA Director of Engineer My work covers a wide range of technical management activities within the company, ranging from the selection of the technological development and DevOps team to the management of the teams, including the definition of the systems architecture and software development, operationalization, and support of the systems. The most successful startup I've been participating in was Terra Networks. I participated in the creation while it was still called NutecNet. We started from scratch and reached millions of users. I set up the entire development and operation team for the services as Director and Principal Architect. When Terra Networks bought the company, I started a new role as a manager of a multinational technical team with people in several countries like the United States, Spain, Mexico, and Brazil. Specialties: * build and management of systems development and DevOps teams * systems architecture * software development * DevOps. There are some ways to hire my services: * For short projects, hiring is done with value and results defined before the start. - longer tasks are contracted by: - hours of monthly dedication - profit-sharing, or by royalties - Participation in the company

With over 25 years of hands-on experience in system administration and a profound understanding of GNU/Linux environments, I offer expertise in open source technologies that drive reliable and efficient systems. My proficiency extends to development on various programming languages, enabling me to craft robust solutions tailored to client requirements. Core Competencies: Systems Administration: Proficient in managing all aspects of the Linux operating system, including CentOS, Debian, Ubuntu, and Slackware distributions. Skilled in system optimization, security, and performance tuning. Software Development: Proficient developer with a focus on Perl, Python, PHP, C, C++, SQL, and JavaScript. Well-versed in Object-Oriented Programming (OOP) principles and application development for diverse platforms. Script Development: Adept at developing scripts in Perl, Python, Bash, and Lua for automation, integration, and system enhancement. Strong advocate for leveraging scripting languages for efficient operations. Database Administration: Extensive experience in administering MySQL/MariaDB, PostgreSQL, Oracle, SQLite, and Redis databases. Proficient in database optimization, replication, and backup strategies. Networking Specialist: Deep understanding of TCP/IP and OSI stack layers, with expertise in proxies, HTTP protocol, RADIUS, VPNs, VLAN, SNMP, netflow/ipfix, and BGP. Experienced in designing, implementing, and troubleshooting complex network infrastructures. Monitoring Architecture: Skilled in designing and implementing infrastructure monitoring solutions, including data gathering, processing, and analysis dashboards. Proficient in monitoring various network devices and systems across diverse environments. Web Hosting and Development: Proficient in web server hosting using Apache, Plack, Starman, and Flask, with expertise in HTML5, JavaScript, and REST APIs. Capable of developing dynamic web solutions in Perl, Python, Bash, or C. Professional Approach: I am committed to delivering tailored solutions that align with my clients' needs and exceed their expectations. My creative thinking and positive attitude ensure that challenges are met with innovative solutions, fostering long-term partnerships built on trust and reliability. Conclusion: With a comprehensive skill set and a proven track record of success, I am dedicated to providing exceptional service and driving continuous improvement in every project I undertake. Let's collaborate to transform your vision into reality and achieve unparalleled success.

Support expert in infrastructure with focus in production environment, knowledge in all the projects phases. Used to being exposed to complex scenarios, analyzing performance, architecture and implementation to operational support. Strong technical profile, fast learner. Knowledge disseminator, focused on the solution of issues and proper documentation. Excellent interpersonal skills and full commitment to critical systems 24/7. Certifications: LPIC-1, LPIC-2 and Novell Certified Linux Administrator Administration and Tuning of UNIX/Linux Systems and applications in general. Administration of Services: Puppet/Foreman, Git, Apache, Nginx, Passenger, Unicorn, WSGI, Free Radius, Iplanet, JBoss, Tomcat, WebLogic, JBoss, Postfix, Sendmail, Solr, ElasticSearch, Redis, Memcached, ActiveMQ, RabbitMQ, Logstash, MySQL, MongoDB, Oracle and etc. Expertise in Shell Scripting and Regular Expressions. I provide remote, Linux systems administration support.