diff --git a/js/script.js b/js/script.js
new file mode 100644
index 0000000..30ef000
--- /dev/null
+++ b/js/script.js
@@ -0,0 +1,153 @@
+document.addEventListener("DOMContentLoaded", () => {
+
+    /* =========================
+       MENU MOBILE
+    ========================= */
+
+    const menuButton = document.querySelector(".menu-toggle");
+    const themeToggle = document.getElementById("theme-toggle");
+    const navMenu = document.querySelector(".nav-links");
+
+    if (menuButton) {
+        menuButton.addEventListener("click", () => {
+            navMenu.classList.toggle("open");
+        });
+    }
+
+    /* =========================
+        THEME
+    ========================= */
+
+    const savedTheme =
+        localStorage.getItem(
+            "portfolio-theme"
+        ) || "dark";
+
+    document.documentElement.setAttribute(
+        "data-theme",
+        savedTheme
+    );
+
+    themeToggle.textContent =
+        savedTheme === "light"
+            ? "☀️"
+            : "🌙";
+
+    themeToggle.addEventListener(
+        "click",
+        () => {
+
+            const currentTheme =
+                document.documentElement.getAttribute(
+                    "data-theme"
+                );
+
+            const nextTheme =
+                currentTheme === "dark"
+                    ? "light"
+                    : "dark";
+
+            document.documentElement.setAttribute(
+                "data-theme",
+                nextTheme
+            );
+
+            localStorage.setItem(
+                "portfolio-theme",
+                nextTheme
+            );
+
+            themeToggle.textContent =
+                nextTheme === "light"
+                    ? "☀️"
+                    : "🌙";
+
+        }
+    );
+
+    /* =========================
+       BOTÃO TOPO
+    ========================= */
+
+    const backToTop = document.getElementById("backToTop");
+
+    window.addEventListener("scroll", () => {
+
+        if (window.scrollY > 500) {
+            backToTop.classList.add("show");
+        } else {
+            backToTop.classList.remove("show");
+        }
+
+    });
+
+    backToTop.addEventListener("click", () => {
+
+        window.scrollTo({
+            top: 0,
+            behavior: "smooth"
+        });
+
+    });
+
+    /* =========================
+       ANIMAÇÃO DAS SEÇÕES
+    ========================= */
+
+    const observer = new IntersectionObserver(
+        entries => {
+
+            entries.forEach(entry => {
+
+                if (entry.isIntersecting) {
+                    entry.target.classList.add("show-element");
+                }
+
+            });
+
+        },
+        {
+            threshold: 0.15
+        }
+    );
+
+    document
+        .querySelectorAll(
+            ".section, .metric-card, .card, .project-card"
+        )
+        .forEach(element => observer.observe(element));
+
+    /* =========================
+       NAVBAR ATIVA
+    ========================= */
+
+    const sections = document.querySelectorAll("section");
+    const navLinks = document.querySelectorAll(".nav-links a");
+
+    window.addEventListener("scroll", () => {
+
+        let current = "";
+
+        sections.forEach(section => {
+
+            const sectionTop = section.offsetTop - 140;
+
+            if (window.scrollY >= sectionTop) {
+                current = section.getAttribute("id");
+            }
+
+        });
+
+        navLinks.forEach(link => {
+
+            link.classList.remove("active");
+
+            if (link.getAttribute("href") === `#${current}`) {
+                link.classList.add("active");
+            }
+
+        });
+
+    });
+
+});
\ No newline at end of file
diff --git a/js/translations.js b/js/translations.js
new file mode 100644
index 0000000..f2b4801
--- /dev/null
+++ b/js/translations.js
@@ -0,0 +1,533 @@
+const translations = {
+
+    pt: {
+
+        "nav.home": "Início",
+        "nav.about": "Sobre",
+        "nav.specialties": "Especialidades",
+        "nav.experience": "Experiência",
+        "nav.projects": "Projetos",
+        "nav.contact": "Contato",
+
+        "hero.badge":
+            "Programador Sênior • Backend Engineer • Tech Lead",
+
+        "hero.title":
+            "Transformando desafios de negócio em soluções robustas, escaláveis e seguras.",
+
+        "hero.description":
+            "Programador Sênior com mais de 15 anos de experiência em desenvolvimento backend, arquitetura de software, cloud computing e liderança técnica.",
+
+        "hero.projects":
+            "Ver Projetos",
+
+        "hero.contact":
+            "Entrar em Contato",
+
+        "about.title":
+            "Sobre Mim",
+
+        "about.description":
+            "Ao longo da minha carreira participei da construção e evolução de sistemas corporativos, integrações críticas, automações de processos e plataformas backend voltadas para desempenho, escalabilidade e confiabilidade.",
+
+        "work.title":
+            "Como Eu Trabalho",
+
+        "work.architecture.title":
+            "Arquitetura",
+
+        "work.architecture.description":
+            "Planejamento técnico antes da implementação.",
+
+        "work.scalability.title":
+            "Escalabilidade",
+
+        "work.scalability.description":
+            "Sistemas preparados para crescimento contínuo.",
+
+        "work.performance.title":
+            "Performance",
+
+        "work.performance.description":
+            "Eficiência operacional e otimização de recursos.",
+
+        "work.security.title":
+            "Segurança",
+
+        "work.security.description":
+            "Boas práticas desde a concepção.",
+
+        "work.quality.title":
+            "Qualidade",
+
+        "work.quality.description":
+            "Código limpo e manutenção simplificada.",
+
+        "metrics.experience":
+            "Anos de Experiência",
+
+        "metrics.leadership":
+            "Liderança Técnica",
+
+        "metrics.cloud":
+            "Oracle Cloud & Azure",
+
+        "metrics.backend":
+            "APIs e Sistemas Corporativos",
+
+        "specialties.title":
+            "Especialidades",
+
+        "experience.title":
+            "Experiência Profissional",
+
+        "specialties.api":
+            "APIs REST",
+
+        "specialties.architecture":
+            "Arquitetura de Software",
+
+        "specialties.cloud":
+            "Cloud Computing",
+
+        "specialties.devops":
+            "DevOps",
+
+        "specialties.database":
+            "Bancos de Dados",
+
+        "specialties.microservices":
+            "Microsserviços",
+
+        "projects.title":
+            "Projetos em Destaque",
+
+        "contact.title":
+            "Vamos Conversar",
+
+        "contact.description":
+            "Disponível para oportunidades profissionais e novos desafios.",
+
+        "stack.title":
+            "Stack Tecnológica",
+
+        "timeline.senior.title":
+            "Programador Sênior",
+
+        "timeline.senior.description":
+            "Desenvolvimento de sistemas corporativos e soluções backend.",
+
+        "timeline.techlead.title":
+            "Tech Lead",
+
+        "timeline.techlead.description":
+            "Liderança técnica e apoio arquitetural.",
+
+        "timeline.cloud.title":
+            "Cloud & DevOps",
+
+        "timeline.cloud.description":
+            "Modernização de infraestrutura e automação.",
+
+        "project.sped.title":
+            "Sistema de Processamento SPED",
+
+        "project.sped.description":
+            "Plataforma responsável pela geração e processamento automatizado de arquivos fiscais SPED.",
+
+        "project.oracle.title":
+            "Infraestrutura Oracle Cloud",
+
+        "project.oracle.description":
+            "Implementação e gerenciamento de infraestrutura cloud.",
+
+        "project.gitea.title":
+            "Servidor Git Privado com Gitea",
+
+        "project.gitea.description":
+            "Ambiente Git privado para versionamento e colaboração.",
+
+        "project.api.title":
+            "APIs Corporativas",
+
+        "project.api.description":
+            "Desenvolvimento de APIs REST utilizando Spring Boot.",
+
+        "footer.role":
+            "Senior Software Engineer • Backend Engineer"
+    },
+
+    en: {
+
+        "nav.home": "Home",
+        "nav.about": "About",
+        "nav.specialties": "Specialties",
+        "nav.experience": "Experience",
+        "nav.projects": "Projects",
+        "nav.contact": "Contact",
+
+        "hero.badge":
+            "Senior Software Engineer • Backend Engineer • Tech Lead",
+
+        "hero.title":
+            "Transforming business challenges into robust, scalable and secure solutions.",
+
+        "hero.description":
+            "Senior Software Engineer with over 15 years of experience in backend development, software architecture, cloud computing and technical leadership.",
+
+        "hero.projects":
+            "View Projects",
+
+        "hero.contact":
+            "Get In Touch",
+
+        "about.title":
+            "About Me",
+
+        "about.description":
+            "Throughout my career I have contributed to corporate systems, critical integrations, process automation and backend platforms focused on performance, scalability and reliability.",
+
+        "work.title":
+            "How I Work",
+
+        "work.architecture.title":
+            "Architecture",
+
+        "work.architecture.description":
+            "Technical planning before implementation.",
+
+        "work.scalability.title":
+            "Scalability",
+
+        "work.scalability.description":
+            "Systems designed for continuous growth.",
+
+        "work.performance.title":
+            "Performance",
+
+        "work.performance.description":
+            "Operational efficiency and resource optimization.",
+
+        "work.security.title":
+            "Security",
+
+        "work.security.description":
+            "Best practices applied from the very beginning.",
+
+        "work.quality.title":
+            "Quality",
+
+        "work.quality.description":
+            "Clean code and simplified maintenance.",
+
+        "metrics.experience":
+            "Years of Experience",
+
+        "metrics.leadership":
+            "Technical Leadership",
+
+        "metrics.cloud":
+            "Oracle Cloud & Azure",
+
+        "metrics.backend":
+            "APIs and Enterprise Systems",
+
+        "specialties.title":
+            "Specialties",
+
+        "experience.title":
+            "Professional Experience",
+
+        "specialties.api":
+            "REST APIs",
+
+        "specialties.architecture":
+            "Software Architecture",
+
+        "specialties.cloud":
+            "Cloud Computing",
+
+        "specialties.devops":
+            "DevOps",
+
+        "specialties.database":
+            "Databases",
+
+        "specialties.microservices":
+            "Microservices",
+
+        "projects.title":
+            "Featured Projects",
+
+        "contact.title":
+            "Let's Talk",
+
+        "contact.description":
+            "Available for professional opportunities and new challenges.",
+
+        "stack.title":
+            "Technology Stack",
+
+        "timeline.senior.title":
+            "Senior Software Engineer",
+
+        "timeline.senior.description":
+            "Development of enterprise systems and backend solutions.",
+
+        "timeline.techlead.title":
+            "Tech Lead",
+
+        "timeline.techlead.description":
+            "Technical leadership and architectural guidance.",
+
+        "timeline.cloud.title":
+            "Cloud & DevOps",
+
+        "timeline.cloud.description":
+            "Infrastructure modernization and automation.",
+
+        "project.sped.title":
+            "SPED Processing Platform",
+
+        "project.sped.description":
+            "Platform responsible for the automated generation and processing of SPED tax files.",
+
+        "project.oracle.title":
+            "Oracle Cloud Infrastructure",
+
+        "project.oracle.description":
+            "Implementation and management of cloud infrastructure.",
+
+        "project.gitea.title":
+            "Private Git Server with Gitea",
+
+        "project.gitea.description":
+            "Private Git environment for version control and team collaboration.",
+
+        "project.api.title":
+            "Enterprise APIs",
+
+        "project.api.description":
+            "Development of REST APIs using Spring Boot.",
+
+        "footer.role":
+            "Senior Software Engineer • Backend Engineer"
+    },
+
+    es: {
+
+        "nav.home": "Inicio",
+        "nav.about": "Acerca de",
+        "nav.specialties": "Especialidades",
+        "nav.experience": "Experiencia",
+        "nav.projects": "Proyectos",
+        "nav.contact": "Contacto",
+
+        "hero.badge":
+            "Programador Senior • Backend Engineer • Tech Lead",
+
+        "hero.title":
+            "Transformando desafíos empresariales en soluciones robustas, escalables y seguras.",
+
+        "hero.description":
+            "Programador Senior con más de 15 años de experiencia en desarrollo backend, arquitectura de software, cloud computing y liderazgo técnico.",
+
+        "hero.projects":
+            "Ver Proyectos",
+
+        "hero.contact":
+            "Contactar",
+
+        "about.title":
+            "Sobre Mí",
+
+        "about.description":
+            "A lo largo de mi carrera participé en sistemas corporativos, integraciones críticas, automatización de procesos y plataformas backend enfocadas en rendimiento, escalabilidad y confiabilidad.",
+
+        "work.title":
+            "Cómo Trabajo",
+
+        "work.architecture.title":
+            "Arquitectura",
+
+        "work.architecture.description":
+            "Planificación técnica antes de la implementación.",
+
+        "work.scalability.title":
+            "Escalabilidad",
+
+        "work.scalability.description":
+            "Sistemas preparados para un crecimiento continuo.",
+
+        "work.performance.title":
+            "Rendimiento",
+
+        "work.performance.description":
+            "Eficiencia operativa y optimización de recursos.",
+
+        "work.security.title":
+            "Seguridad",
+
+        "work.security.description":
+            "Buenas prácticas aplicadas desde la concepción.",
+
+        "work.quality.title":
+            "Calidad",
+
+        "work.quality.description":
+            "Código limpio y mantenimiento simplificado.",
+
+        "metrics.experience":
+            "Años de Experiencia",
+
+        "metrics.leadership":
+            "Liderazgo Técnico",
+
+        "metrics.cloud":
+            "Oracle Cloud y Azure",
+
+        "metrics.backend":
+            "APIs y Sistemas Corporativos",
+
+        "specialties.title":
+            "Especialidades",
+
+        "experience.title":
+            "Experiencia Profesional",
+
+        "specialties.api":
+            "APIs REST",
+
+        "specialties.architecture":
+            "Arquitectura de Software",
+
+        "specialties.cloud":
+            "Computación en la Nube",
+
+        "specialties.devops":
+            "DevOps",
+
+        "specialties.database":
+            "Bases de Datos",
+
+        "specialties.microservices":
+            "Microservicios",
+
+        "projects.title":
+            "Proyectos Destacados",
+
+        "contact.title":
+            "Hablemos",
+
+        "contact.description":
+            "Disponible para oportunidades profesionales y nuevos desafíos.",
+
+        "stack.title":
+            "Stack Tecnológico",
+
+        "timeline.senior.title":
+            "Programador Senior",
+
+        "timeline.senior.description":
+            "Desarrollo de sistemas empresariales y soluciones backend.",
+
+        "timeline.techlead.title":
+            "Tech Lead",
+
+        "timeline.techlead.description":
+            "Liderazgo técnico y apoyo arquitectónico.",
+
+        "timeline.cloud.title":
+            "Cloud & DevOps",
+
+        "timeline.cloud.description":
+            "Modernización de infraestructura y automatización.",
+
+        "project.sped.title":
+            "Plataforma de Procesamiento SPED",
+
+        "project.sped.description":
+            "Plataforma responsable de la generación y procesamiento automatizado de archivos fiscales SPED.",
+
+        "project.oracle.title":
+            "Infraestructura Oracle Cloud",
+
+        "project.oracle.description":
+            "Implementación y gestión de infraestructura en la nube.",
+
+        "project.gitea.title":
+            "Servidor Git Privado con Gitea",
+
+        "project.gitea.description":
+            "Entorno Git privado para control de versiones y colaboración.",
+
+        "project.api.title":
+            "APIs Empresariales",
+
+        "project.api.description":
+            "Desarrollo de APIs REST utilizando Spring Boot.",
+
+        "footer.role":
+            "Senior Software Engineer • Backend Engineer"
+    }
+};
+
+function applyLanguage(lang) {
+
+    const dictionary =
+        translations[lang] || translations.pt;
+
+    document
+        .querySelectorAll("[data-i18n]")
+        .forEach(element => {
+
+            const key = element.dataset.i18n;
+
+            if (dictionary[key]) {
+                element.textContent = dictionary[key];
+            }
+
+        });
+
+    document.documentElement.lang = lang;
+
+    localStorage.setItem(
+        "portfolio-language",
+        lang
+    );
+
+    document
+        .querySelectorAll("[data-lang]")
+        .forEach(button => {
+
+            button.classList.remove("active");
+
+            if (button.dataset.lang === lang) {
+                button.classList.add("active");
+            }
+
+        });
+}
+
+document
+    .querySelectorAll("[data-lang]")
+    .forEach(button => {
+
+        button.addEventListener("click", () => {
+            applyLanguage(button.dataset.lang);
+        });
+
+    });
+
+document.addEventListener("DOMContentLoaded", () => {
+
+    const savedLanguage =
+        localStorage.getItem(
+            "portfolio-language"
+        );
+
+    applyLanguage(
+        savedLanguage || "pt"
+    );
+
+});
\ No newline at end of file