Notable Highlight
Built backend systems handling 2M+ requests per day and optimized infrastructure costs by up to 40%. Developed a cross-platform Flutter application used by 100K+ users.
Experience Summary
Marcus is a Senior Full-Stack Software Engineer with 5+ years of experience building scalable web applications, e-commerce platforms, cloud-native systems, and AI-integrated products. His background spans frontend-heavy product development, backend engineering, DevOps, and cloud infrastructure across startups and SaaS businesses. He worked extensively with React, Next.js, TypeScript, Node.js, AWS, and GCP. He built and optimized customer-facing commerce applications, including responsive e-commerce platforms, mobile apps, SEO-optimized storefronts, and high-performance frontend systems. Marcus contributed to both greenfield builds and legacy modernization projects, consistently improving application performance, frontend responsiveness, deployment workflows, and engineering scalability. He leveraged AI-assisted engineering workflows using Claude, ChatGPT, GitHub Copilot, and automation tooling to accelerate development velocity and improve engineering efficiency. Alongside his frontend engineering capabilities, he brought strong production engineering discipline through CI/CD implementation, observability tooling, automated testing, and cloud infrastructure optimization.
Key Achievements
* Built scalable e-commerce applications and storefront systems using React, Vue, Nuxt, and TypeScript. * Improved frontend performance and application responsiveness by up to 35% through optimization and caching strategies. * Reduced infrastructure costs by 40% through AWS optimization and cloud architecture improvements. * Developed scalable backend systems processing millions of requests daily with low-latency APIs. * Delivered mobile applications supporting 100K+ users across iOS and Android. * Improved SEO performance and first-page rankings across multiple e-commerce projects. * Integrated automated testing pipelines with Jest, Mocha, Cypress, and CI/CD workflows. * Built AI-assisted engineering workflows using Claude Code, ChatGPT, and GitHub Copilot.
Skills
Work Experience
Senior Software Engineer
CT · Montreal, QC · Jun 2024 – Present
- Enhance 2 cloud APIs (Node.js and Python) on AWS and Azure, increasing observability, adding secure endpoints, load balancing, async processing, and boosting performance and reliability while reducing costs.
- Build high-performance, secure backend systems using MySQL, and Redis, reducing API response times by up to 50% through query optimization, best code practices, and caching.
- Lead frontend development of a multilingual web platform for international clients using Angular, NgRx, ReactJS, Redux, TypeScript, jQuery, JavaScript, SCSS, and Bootstrap, improving load times by 30%.
- Apply DevOps practices by containerizing applications with Docker, Shell Script, and Node.js, streamlining team setups and reducing environment-related bugs by 40% and simplifying deployment at scale.
- Develop Jest (TypeScript) unit tests (60%+ coverage) and integrate into GitLab CI/CD, collaborating with QA to detect defects early and prevent regressions in production.
- Collaborate in Agile ceremonies, code reviews, and mentoring to drive knowledge sharing, improve sprint outcomes, and ensure code quality across an international team.
Software Engineer
Tar. · Campinas, SP · Dec 2023 – Jun 2024
- Develop 9 user-friendly front-end web interfaces using AngularJS, TypeScript, JavaScript, Bootstrap, and Tailwind, ensuring consistent design and enhanced user experience across devices.
- Reduce Google Cloud Platform (GCP) costs by 35% for an Artificial Intelligence (AI) product by analyzing usage, optimizing resources, and clearly communicating solutions to stakeholders through BigQuery insights.
- Build scalable back-end microservices architecture with Node.js, Python, ExpressJS, and GraphQL, leveraging Firebase to boost reliability 40%, optimize performance, and enable real-time data handling.
- Integrate unit, integration, and E2E (end-to-end) tests using Mocha, TypeScript, Cypress, and Firebase with 60%+ coverage into GitLab CI/CD pipelines, enabling automated quality checks.
- Leverage Python with TensorFlow to develop and optimize AI models, enhancing predictive accuracy.
Full Stack Software Engineer
LM · São José dos Campos, SP · Jan 2023 – Dec 2023
- Design 5+ responsive e-commerce web apps using HTML, CSS, Bootstrap, Vue, Nuxt, and jQuery, cutting client costs by 15% and boosting SEO rankings by 10% while ensuring scalability and accessibility.
- Engineer a Flutter cross-platform mobile application for iOS and Android integrated with RESTful APIs, used by 100K+ active users, improving UX and accelerating feature delivery.
- Practice Test-Driven Development (TDD) to write 50+ unit and integration tests with Jest and Mockito.
- Streamline software development workflows and strengthen web architecture by configuring 3 Docker containers and managing code with GitHub and Bitbucket.
Full Stack Software Engineer
MW · São José dos Campos, SP · Dec 2020 – Dec 2022
- Architect and maintain 7+ full-stack website applications using PHP and JavaScript programming languages, React.js, Next, MongoDB, and PostgreSQL, ensuring scalable and maintainable codebases.