CHRISTIAN DE ORNELLAS POSSIDONIO
Tech Lead & Senior Software Developer – React | React Native | Node.js

Email: possidonio.ch@gmail.com
LinkedIn: linkedin.com/in/christian-possidonio
GitHub: github.com/christian-de-ornellas

------------------------------------------------------------

PROFESSIONAL SUMMARY
============================================================
I started my career building public and corporate systems, which gave me a strong foundation in logic, processes, and real software delivery. Over more than 10 years, I evolved from backend development with PHP to specializing in React, React Native, and Node.js, building products used by millions of people. Today I work as a Tech Lead, guiding teams and defining the technical architecture of large-scale digital products. My approach combines product vision, code governance, and hands-on team leadership — always focused on quality, scalability, and consistent delivery. I have deep experience building Design Systems, structuring monorepos, architecting event-driven systems, and integrating complex APIs. I advocate for Clean Code, SOLID, and Clean Architecture as the foundation for teams that need to grow without losing speed.

TECHNICAL SKILLS
============================================================
Frontend: React, Next.js, React Native, TypeScript, JavaScript, HTML5, CSS3, SASS, Tailwind, Emotion, Styled Components, Bootstrap, Chakra UI, Material UI, Shadcn UI
Backend: Node.js, Express.js, Nest.js, TypeScript, JavaScript
Databases: MySQL, PostgreSQL, MongoDB, SQLite, DynamoDB
DevOps & Cloud: AWS (S3, Lambda, EC2, RDS, Amplify), Azure, Firebase, Docker, CI/CD, Git
Testing & Quality: Jest, Testing Library, Cypress, Supertest, Storybook
State Management: Redux, Context API, Zustand, React Query
Methodologies & Best Practices: Clean Code, SOLID, Clean Architecture, Atomic Design, Scrum, Kanban
Versioning & Workflow: Git, GitHub, GitLab, Bitbucket, Lerna (Monorepo)

PROFESSIONAL EXPERIENCE
============================================================
Tech Lead | Rethink
May 2025 – present | Belo Horizonte, MG
- Took on technical leadership of the Swift e-commerce platform (JBS Group), one of the largest retail digital products in Brazil, coordinating the development team and ensuring delivery quality.
- Established architecture standards and code governance practices that reduced inconsistency across squads and accelerated onboarding of new developers.
- Structured and deployed a Design System with Storybook, creating a reusable component library that unified the product visual identity.
- Technologies: TypeScript, React.js, Remix.js.

Senior Software Developer | Plannera
March 2023 – March 2025 | Centro, Rio de Janeiro
- Acted as technical reference in the development of critical inventory and demand management platforms used by companies for operational decision-making.
- Architected and implemented a monorepo with Lerna, unifying multiple packages and reducing code duplication across projects in the ecosystem.
- Led the creation of a Design System with Storybook, standardizing components and accelerating the development of new features.
- Technologies: TypeScript, React.js, Next.js, Node.js.

Senior Software Developer | FDTE
July 2022 – February 2023 | São Paulo, SP
- Worked on a white-label e-commerce platform used by major brands such as FastShop and Lupo, requiring a high level of abstraction and configurability.
- Designed a scalable Design System that allowed each brand to apply its visual identity without compromising the shared component base.
- Contributed to the platform event architecture, decoupling services and improving resilience and operation traceability.
- Technologies: TypeScript, React.js, Next.js, Node.js.

Senior Software Developer | ITSector
April 2021 – June 2022 | Porto, Portugal
- Joined a team developing banking applications for Millennium BCP and Activobank, two of Portugal's largest banks, in a context of high regulatory and UX demands.
- Built financial solutions for loan and financing workflows, translating complex business rules into accessible and secure interfaces.
- Worked with React.js on web and React Native on mobile, ensuring a consistent experience across platforms.
- Technologies: React.js, React Native, Next.js, Node.js.

Founder & Senior Software Developer | Orient Me
September 2020 – April 2021 | São João de Meriti, RJ
- Founded Orient Me with the goal of democratizing digital transformation for small and medium businesses, delivering e-commerce solutions, institutional websites, and mobile applications.
- Managed a multidisciplinary team and introduced Scrum as a working methodology, structuring ceremonies that improved predictability and delivery cadence.
- Acted simultaneously as leader and developer, deepening my understanding of the connection between technical decisions and business impact.
- Technologies: React.js, React Native, Next.js, Node.js, Firebase, AWS.

Mid-level Software Developer | Calindra
September 2019 – August 2020 | Botafogo, Rio de Janeiro
- Developed new features for the Ame Digital app, a fintech with millions of users, working with React Native in a high-quality, high-performance environment.
- Built a new interface for the Eu Entrego platform, rewriting UX flows to improve the delivery person experience and reduce operational friction.
- Technologies: React Native, React.js, Node.js, Serverless.

Mid-level Software Developer | Redes de Clínicas Médicas
March 2019 – August 2019 | Nova Iguaçu, RJ
- Developed an online subscription system and an ERP for internal clinic management, automating administrative processes that were previously handled manually.
- Technologies: React.js, Node.js, MongoDB, Laravel.

Mid-level Software Developer | Master GSG
October 2017 – October 2018 | Penha Circular, Rio de Janeiro
- Developed internal logistics and sales systems, contributing to the digitalization of the company's operational processes.
- Technologies: PHP, MySQL, SQL Server, jQuery.

Junior Software Developer | Electronic
April 2016 – January 2017 | Pilares, Rio de Janeiro
- Developed systems for electronic security and call centers, learning to work with complex operational requirements and real-time integrations.
- Technologies: PHP (Laravel), Node.js, Python (Flask), MongoDB, MySQL.

Junior Software Developer | CUFA
November 2014 – August 2015 | Madureira, Rio de Janeiro
- Developed dynamic websites and internal systems for CUFA social projects, contributing technology to community impact initiatives.
- Technologies: PHP, WordPress, MySQL, JavaScript, Bootstrap.

Junior Software Developer | Prefeitura de São João de Meriti
October 2013 – November 2014 | São João de Meriti, RJ
- Started my career developing ERP and operational systems for government departments, learning to turn bureaucratic processes into functional digital solutions.
- Participated in requirements gathering with non-technical stakeholders, building communication and business understanding skills from the very beginning.
- Technologies: PHP, SQL Server, HTML, CSS, Bootstrap.

LANGUAGES
============================================================
- Portuguese: Native
- English: A2 (Basic)
- Spanish: A1 (Beginner)

EDUCATION
============================================================
Associate Degree in Systems Analysis and Development
Estácio de Sá | Completed in 2026