Cesar M.

At Altruist, a leading U.S.-based fintech company, I was responsible for implementing and maintaining new features in our web platform using React.js, Node JS, Apollo, and GraphQL.

My key responsibilities included

• Implemented new product features based on business and product requirements, following Test-Driven Development (TDD) practices and ensuring high-quality delivery through end-to-end testing with Cypress and unit/integration tests using Jest and React Testing Library.
• Contributed to the frontend platform and company-wide design system, collaborating with cross-functional teams to build reusable, accessible UI components using React, Storybook, and styled-components, improving consistency and development velocity across multiple products.
• Developed and maintained a Backend-for-Frontend (BFF) layer using Apollo and GraphQL, enabling efficient data aggregation, response caching, and optimized data access patterns between frontend applications and distributed backend services.
• Implemented and evolved backend services using Node.js and Express as part of a microservices-based architecture, collaborating with multiple service owners.

PedidosYa is a leading multi-platform on-demand delivery company in Latin America, serving millions of users across multiple countries. I worked as a Full stack engineer contributing to the development and evolution of customer-facing web platforms.

• Led the transition to a micro-frontend architecture, significantly improving scalability, modularity, and development velocity, while enabling independent deployments across teams.
• Actively worked within monorepo architectures using Nx, managing multiple applications and shared libraries, and building production-ready applications with Next.js to support scalable, frontend-oriented platforms.
• Drove the company-wide adoption of Test-Driven Development (TDD), improving overall code quality and achieving 75% test coverage across core frontend and backend applications.
• Acted as a technical leader and mentor, defining engineering best practices, conducting architectural reviews, and supporting engineers across different seniority levels.
• Led performance optimization initiatives that resulted in a 40% improvement in application load times, enhancing user experience and platform reliability.
• Implemented monitoring and observability solutions using Datadog and Sentry, improving system visibility, error tracking, and operational stability in production environments.
• Contributed to building a high-performance engineering culture, balancing innovation, delivery speed, system stability, and long-term maintainability at scale.