# Marcio Merlone Software Engineer — Platform Architect & Full-Stack Reliability Engineer Araucária, PR, Brazil — Curitiba Area, Brazil ## Summary Bridging the gap between ambitious technical vision and reliable production systems through collaborative engineering and operational empathy. Specialist in building resilient, accessible platforms that scale from foundational infrastructure to pixel-perfect UIs for global brands. With 20+ years of experience, I excel at 'living with decisions,' evolving legacy ERPs into scalable cloud-ready environments while maintaining a relentless focus on reliability, performance, and user experience. ## Core Expertise ### High-Performance UI Architecture Scaling global frontend systems for Fortune 500 brands with a focus on 'Accessibility as Architecture'. **Keywords:** React, TypeScript, Node.js, Docker, Tailwind, Agile, Scrum, jest, Cypress, Shopify theme, Discourse theme, WordPress theme, Accessibility, WCAG, Responsive Design, Scalable Applications, Inclusivity ### Resilient Platform Architecture Architecting resilient internal applications to ensuring reliability and performance with a 99.9% uptime. **Keywords:** Microsoft, Samba4, Postfix, Dovecot, OpenLDAP, DNS, DHCP, LDAP, AD, GIT, VMware ESXi, vCenter, Proxmox, Zabbix, Graylog, IPAM, Backup ### Operational Stewardship A 20+ year track record of 'living with decisions,' evolving mission-critical legacy ERPs into scalable cloud-ready environments. **Keywords:** Hardware, Networking, Monitoring, Backups, Process, Planning, Self Hosted Email, DNS, MX, etc., Virtualization, Networking, Security, Infrastructure, Project Management, Team Leadership, Cost Reduction, Reliability, Performance, Growth, Uptime ## Professional Experience ### ArcTouch — Senior Software Engineer 2022-03 – Present · Remote Front-end development using React and TypeScript for clients such as HP, Cirrus Aircraft, AKQA, Quizlet, and others. Implementing efficient, responsive UIs following best practices, collaborating with cross-functional teams, and participating in agile rituals. Writing and maintaining unit and integration tests, contributing to accessibility efforts (WCAG), and developing custom themes and integrations for Shopify and Discourse. - Front-end development using React and TypeScript for clients such as HP, Cirrus Aircraft, AKQA, and Quizlet - Implemented efficient, responsive UIs following best practices - Collaborated with cross-functional teams and participated in agile rituals - Wrote and maintained unit and integration tests - Contributed to accessibility efforts (WCAG) - Developed custom themes and integrations for Shopify and Discourse - Contributed to internal design system and component library development - Mentored junior developers and conducted code reviews to maintain code quality - Optimized application performance and implemented best practices for front-end architecture - Participated in client meetings to gather requirements and provide technical insights - Stayed up-to-date with industry trends and emerging technologies to continuously improve skills and contribute innovative solutions - Leveraged a plethora of AI tools to enhance development efficiency and code quality, while maintaining a strong focus on human-centered design and user experience **Technologies:** React, TypeScript, Node.js, Docker, Tailwind, Agile, Scrum, jest, Cypress, Shopify theme, Discourse theme, WordPress theme, Accessibility, WCAG, Responsive Design, Scalable Applications, Inclusivity ### A1 Tecnologia Industrial — IT Staff / Network & Systems Manager 2007-03 – 2022-03 · Curitiba Area, Brazil Successfully sustained a continuous network growth and infrastructure modernization for 15 years, ensuring performance, security, compliance, and reliability. - Owned systems, servers, network SLA, intranet development (PHP), provisioning, IT security, mail flow and storage, backups, and IT roadmap - In-house, on-premise, full internet presence and hosting, including DNS, email services and web hosting for 15+ years with 99.9% uptime, security and performance - Coordinated IT architecture, network, server, and database access - Consolidated physical servers into virtual environments (VMware ESXi → vCenter) - Full migration of all email users to Microsoft Exchange Cloud - Upgraded firewalls and orchestrated site migrations - Integrated remote offices via secure VPN and implemented VLAN strategies - Implemented an in-house GitLab server, migrating a legacy CVS server - Deployed monitoring and logging (Zabbix, Graylog) - Pro-active, providing focused applications for identified needs, including email solutions and tools, communication, secure data sharing, monitoring, storage and everything else related to the business and its growth **Technologies:** PHP, MySQL, Linux, Windows Server, Self Hosted Email, DNS, MX, etc., Virtualization, Networking, Security, Infrastructure, Project Management, Team Leadership, Cost Reduction, Reliability, Performance, Growth, Uptime, VPN, Firewall, VLAN, Routing, Archiving, Backup, Open-Source, ISO 9001, Auditing ### Áton Tecnologia — PHP Developer 2006-04 – 2007-08 · Curitiba, Paraná, Brazil - Full-stack PHP development using Smarty templates, JavaScript, and Ajax - Contributed to an in-house PHP framework using OO and MVC patterns **Technologies:** PHP, MySQL, Linux ### AmbienteBrasil — IT 2005-09 – 2006-03 · Curitiba, Paraná, Brazil Environment and ecological portal. - Deployed and managed web, DNS, email (IMAP), proxy, and firewall servers - Acted as full-stack PHP developer and product owner; managed long-distance wireless network **Technologies:** PHP, MySQL, Linux, Proxy, Firewall, Wireless Networking ### Locaweb Ltda — Senior Systems Analyst 2004-04 – 2005-04 · São Paulo, Brazil A leading Brazilian web hosting and cloud services company. - Developed and maintained user modules for customer admin portal and webmail - Worked with Perl and PHP using MySQL and Smarty templates **Technologies:** Perl, PHP, MySQL, Smarty ### Dialdata Ltda — Full Systems Analyst 2001-01 – 2004-03 · São Paulo, Brazil One of the first Brazilian internet service providers during the dial-up era. - Installed, administered, and maintained servers and applications on Solaris, FreeBSD, Linux, and Windows 2000 - Provided Level 3 support and designed resilient mail server clusters (Postfix + OpenLDAP) with load balancing **Technologies:** Solaris, FreeBSD, Linux, Windows 2000, Postfix, OpenLDAP, sendmail, qmail ### Breuling & Hoffelder Ltda. — IT Guy 2000-04 – 2000-12 · São José Dos Pinhais, PR Company providing labor for industrial quality control services. - Oversaw structured network cabling and deployed internal Linux servers for sharing, email, intranet, and DNS - Implemented dial-up/ISDN connectivity and Squid proxy - Defined systems/processes for ISO compliance and conducted training and audits **Technologies:** Linux, Structured Cabling, ISDN, Squid, Samba ### Visywork e-Business System — Technical and Commercial Consultant 1999-11 – 2000-04 · Curitiba, PR - Technical sales, support, and after-sales for IBM/Lotus SmartSuite; delivered user training ### Furukawa Industrial S.A. — Mechanical Design Drafter 1995-04 – 1999-03 · Curitiba, PR Global communications infrastructure manufacturer providing high-performance optical connectivity and data center solutions. - Managed supplier negotiations, coordinated production line installation - Performed 2D/3D design of mechanical tools and equipment using AutoCAD and Solid Edge **Technologies:** AutoCAD, Solid Edge ### PBN Indústria e Comércio. — Mechanical Design Drafter 1992-01 – 1995-04 · Curitiba, PR Small supplier of custom mechanical devices and tools for industries on the Curitiba area. - First job, responsible for technical drawings and project documentation for industrial machinery - Learned and implemented industrial processes and standards, which gave me the opportunity to visit and work inside industries such as Bosch, Volvo, Furukawa, and many other manufacturing industries, learning about their production processes and methods. - Managed supplier negotiations, coordinated production line installation - Performed 2D/3D hand design of mechanical tools and equipment using AutoCAD and Solid Edge **Technologies:** Physical clipboard and paper, Ink pen, technographer ## Selected Challenges ### Developing High-Impact and User-Centric Solutions for Global Brands **Company:** ArcTouch Brasil Contribute to innovative and user-centric web applications and features for globally recognized brands, ensuring high levels of usability and accessibility in line with WCAG guidelines to reach a wider audience and meet inclusivity standards. **Actions:** - Developed and implemented robust front-end components using React, TypeScript, JavaScript, HTML, and CSS, prioritizing semantic structure and keyboard navigation. - Conducted testing to verify functionality across different user interaction methods and assistive technologies. - Ensured appropriate color contrast ratios and provided meaningful alternative text for images and other non-text content. - Participated in code reviews, providing feedback on usability and inclusive design principles. **Results:** - Delivered high-quality user interfaces that met the rigorous standards of globally recognized brands while being more usable for diverse users. - Contributed to the development of applications that are more inclusive and accessible to a broader audience, including users with disabilities. - Increased the potential reach and positive impact of the applications by prioritizing accessibility considerations. **Technologies:** React, TypeScript, JavaScript, HTML, CSS ### Extending and Customizing Leading SaaS Platforms **Company:** ArcTouch Brasil Tailor popular SaaS platforms like Shopify and Discourse to meet specific and unique client requirements. **Actions:** - Developed custom themes using Shopify Liquid to create branded and engaging storefronts. - Built plugins with Ruby on Rails for Discourse to extend its core functionality and community features. **Results:** - Enabled clients to have customized platform experiences aligned with their brand and business needs. - Enhanced platform functionality and user engagement through custom extensions. **Technologies:** Shopify Liquid, Ember, Handlebars, JavaScript, CSS ### Orchestrating Seamless and Complex Content Migrations **Company:** ArcTouch Brasil Migrate a significant amount of content from a WordPress platform to Contentstack with minimal data loss and disruption. **Actions:** - Developed and executed a comprehensive content migration strategy. - Utilized scripting (likely JavaScript or PHP) to automate the transfer and transformation of data. - Ensured data integrity and performed thorough post-migration testing. **Results:** - Successfully migrated content to Contentstack, providing a more modern and scalable content management solution. - Documented the process and outcomes, which will be featured in an upcoming ArcTouch blog article. **Technologies:** WordPress, Contentstack, Data Migration, JavaScript, PHP ### Architecting and Implementing Seamless Authentication Upgrades **Company:** A1 Engenharia Upgrade the network authentication system from an LDAP database to Active Directory without causing any disruption to end-users. **Actions:** - Designed and planned the Active Directory implementation and migration strategy. - Configured Active Directory services and integrated existing systems. - Performed rigorous testing and implemented a phased rollout to minimize potential issues. **Results:** - Successfully migrated the authentication system to Active Directory with no noticeable impact on end-users. - Enhanced security and provided centralized user management for the entire network. **Technologies:** LDAP, Active Directory, System Migration, Authentication Protocols ### Modernizing Communication and Collaboration Infrastructure **Company:** A1 Engenharia Replace a legacy Postfix email server with a more modern solution that reduces cloud hosting costs and improves user experience with integrated calendaring and contacts. **Actions:** - Evaluated various self-hosted solutions and selected SOGo. - Deployed and configured the SOGo server and migrated existing email data. - Provided user guidance on the new features, including calendaring and contacts. **Results:** - Significantly reduced cloud-based email hosting costs by implementing a self-hosted solution. - Improved user experience by offering built-in calendaring and contacts functionalities. **Technologies:** Postfix, SOGo, Linux Server Administration, Email Protocols (IMAP, SMTP, EAS) ### Facilitating Transition to Cloud Services **Company:** A1 Engenharia Migrate the company's email infrastructure to the Microsoft Cloud to leverage its scalability and features. **Actions:** - Planned and executed the migration of email mailboxes to Microsoft Cloud (likely Exchange Online). - Configured and integrated the cloud email services with the existing network infrastructure. **Results:** - Enabled the company to benefit from the scalability and features of Microsoft Cloud for email. - Streamlined email management and potentially improved collaboration capabilities. **Technologies:** Microsoft Cloud (Exchange Online), Cloud Migration Strategies ### Driving Scalability and Reliability Through Strategic Virtualization **Company:** A1 Engenharia Improve the reliability and scalability of the server infrastructure to support company growth. **Actions:** - Designed and implemented a virtualization strategy, consolidating 15 physical servers onto a new redundant SAS storage infrastructure. - Deployed and managed over 60 virtual machines to host various applications and services. **Results:** - Significantly improved system reliability and performance. - Provided the scalable infrastructure necessary to support over 400% company growth. **Technologies:** VMware ESXi, vCenter, Shared SAS Storage, Windows Server, Linux ### Ensuring Business Continuity Through Robust Network Management and Security **Company:** A1 Engenharia Maintain high availability of critical systems and protect the network from security threats. **Actions:** - Implemented proactive network monitoring using Zabbix. - Upgraded the firewall to a virtualized pfSense instance and configured comprehensive security rules. - Implemented VLAN segmentation and secure VPN access. - Established user lifecycle management and auditing processes. **Results:** - Maintained uptime exceeding 99% for critical systems. - Achieved zero security incidents during my tenure. **Technologies:** pfSense, VLAN, IPsec VPN, OpenVPN, Network Monitoring (Zabbix) ### Developing User Interface Functionality for a SaaS Platform **Company:** Locaweb Ltda. Enhance the functionality and user experience of the user options module within a widely used web hosting and corporate email platform. **Actions:** - Developed and implemented new features and improvements to the user options module using PERL, PHP, MySQL, CSS, and Smarty templates. - Collaborated with other developers to integrate the module seamlessly into the existing platform. **Results:** - Improved the functionality and user experience for a large user base of the Locaweb platform. **Technologies:** PERL, PHP, MySQL, CSS, Smarty ### Establishing and Managing Core Internet Services **Company:** AmbienteBrasil Ltda. Provide reliable and accessible internet services for the company's environmental portal with limited resources. **Actions:** - Deployed and configured Apache, bind, postfix, and squid on the company's servers. - Managed the ongoing operation and maintenance of these critical services. **Results:** - Ensured the continuous availability of the company's environmental portal and related internet services for its users. **Technologies:** Apache, bind, postfix, squid ### Implementing and Maintaining Internal IT Infrastructure **Company:** Breuling & Hoffelder Ltda. Establish a functional and organized internal IT infrastructure for a small team. **Actions:** - Installed structured network cabling. - Deployed and configured internal Linux servers for file sharing and other services. - Contributed to the definition of processes for ISO certification. **Results:** - Provided a foundational IT infrastructure to support the company's operations and facilitate future growth. - Contributed to efforts aimed at achieving ISO quality standards. **Technologies:** Linux ## Open Source Projects ### YwyBase A Solid Ground to Scale. A comprehensive Next.js application with authentication, Material UI, and modern best practices. - [Demo](https://ywybase.vercel.app/) - [Source](https://github.com/mmerlone/ywybase) **Technologies:** Next.js 15+, React 19+, Supabase, TailwindCSS, TypeScript, Material UI, Sentry, Pino Logger ### mui7-phone-number A phone number input component for MUI v7+ with auto-formatting, country selection, and full TypeScript support. - [Demo](https://ywybase.vercel.app/demos/mui7-phone-number/) - [Source](https://github.com/mmerlone/mui7-phone-number) **Technologies:** React 19+, TypeScript, Material UI v7+ ### react-tz-globepicker Interactive globe picker for React applications that need timezone selection, timezone visualization, or a compact world-time UI. - [Demo](https://ywybase.vercel.app/demos/react-tz-globepicker/) - [Source](https://github.com/mmerlone/react-tz-globepicker) **Technologies:** React 19+, TypeScript ## Technical Skills ### Programming Languages - React - TypeScript - JavaScript - PHP - Perl - HTML - CSS - SQL - Bash ### Operating Systems - Linux - Unix - Solaris - FreeBSD - Windows ### Hardware - IBM - Dell - iDrac - tape libraries - UniFi - Ubiquiti - RAID - DAS - SAS ### Servers & Services - DNS - FTP - DHCP - LDAP - NFS - SNMP - GIT - SMTP - IMAP - POP3 - Apache - nginx - IIS - Tomcat - sendmail - Postfix - Dovecot - OpenLDAP - Samba - AD - IAM - DRP - Squid - Zabbix - Netdisco - Graylog - Openfire RTC Server - IPAM - GitLab - Docker ### Databases - MySQL - MariaDB - PostgreSQL - MS-SQL - MongoDB ### Platforms & Tools - Shopify - Discourse - Contentstack - WordPress - SOGo ### Virtualization - VMware ESXi - vCenter - VirtualBox ### Networking & Security - pfSense/OPNSense - ACL - VLAN - IPsec VPN - OpenVPN - RLS - SSL - TLS - firewalls - IDS - network monitoring - routing - switching - wireless - network design - network security ### Backup & Recovery - Bacula - rsync - contingency & disaster recovery - storage ### Cloud - Azure - Microsoft Cloud migrations ### Automation - bash - node - husky ### Other - design systems - MVC - WCAG accessibility ## Credentials & Certifications - ISO 9001:2008 Internal Auditor - Microsoft Certified Professional (ID #2432097, 2003) - Various Microsoft courses (Windows 2000 support, networking, SQL Server 2000) - SQL database introduction - Introduction to Project Management (PMBOK) - React, ES6+, Agile, Scrum ## Education ### Universidade Federal do Paraná Bachelor's program in Informatics · 1994-1995 Completed two years. ### Pontifícia Universidade Católica do Paraná Bachelor's program in Computer Science · 1991-1992 Completed two years. ### Centro Federal de Educação Tecnológica do Paraná Industrial Mechanic Technician · 1986-1989 ## Resume - [Download résumé (PDF)](https://mmerlone.dev.br/documents/MarcioMerlone.pdf) ## Source Code - [View source on GitHub](https://github.com/mmerlone/portfolio) ## Contact - **Email:** [mmerlone@gmail.com](mailto:mmerlone@gmail.com) - **Location:** Araucária, PR, Brazil — Curitiba Area, Brazil - **LinkedIn:** [https://www.linkedin.com/in/mmerlone](https://www.linkedin.com/in/mmerlone) - **GitHub:** [https://github.com/mmerlone](https://github.com/mmerlone) - **Personal Website:** [https://mmerlone.dev.br/](https://mmerlone.dev.br/) - **Instagram:** [https://www.instagram.com/mmerlone/](https://www.instagram.com/mmerlone/) - **Facebook:** [https://www.facebook.com/mmerlone](https://www.facebook.com/mmerlone)