Fullstack Frontend Engineer

Resilientco

Brazil Remote contract

Posted: February 23, 2026

Job Description

Our client, a leading payments and digital wallet company, is seeking a highly skilled and experienced Senior Fullstack Frontend Engineer to join their dynamic engineering team. This role is critical to the company’s mission of delivering seamless, secure, and innovative monetary transaction solutions worldwide. The ideal candidate will independently develop and maintain sophisticated web applications, leveraging React and Redux on the front end, with a solid understanding of JavaScript. This position offers the opportunity to tackle complex front-end challenges, build new features that impact millions of users globally, and ensure the highest quality through rigorous testing and debugging. The Senior Fullstack Frontend Engineer will collaborate closely with cross-functional teams to support smooth releases and continuous improvement of the product.

Must Have skills:
• JavaScript: Expert-level proficiency in JavaScript, including ES6 features, asynchronous programming, and modern development patterns.

• Ability to write clean, maintainable, and efficient code is essential for both front-end and back-end development.

• React: Strong experience with React, including component-based architecture, state management, and lifecycle methods. Proficiency in Redux for state management is critical. The ability to solve complex UI challenges and optimize rendering performance is essential.

• Node.js: Proficient in Node.js for server-side development, with a deep understanding of event-driven architecture, asynchronous I/O, and RESTful API design.

• Express: Experience building scalable and secure APIs using Express.js, including middleware integration, routing, and error handling.

• Jest: Skilled in writing unit and integration tests using Jest to ensure code reliability and maintainability. Familiarity with mocking, snapshot testing, and test coverage analysis.

• React Testing Library: Proficient in using React Testing Library to write tests that simulate user interactions and verify component behavior, ensuring a robust front-end codebase.

• Debugging: Strong debugging skills across both client-side and server-side environments. Ability to diagnose and fix complex issues using browser developer tools, Node.js debuggers, and logging frameworks.

Nice to have skills:
• CSS: Solid understanding of CSS, including Flexbox, Grid, and responsive design principles, to create visually appealing and accessible user interfaces.

• GraphQL: Experience with GraphQL APIs, including schema design, queries, mutations, and integration with React using Apollo Client.

• Cypress: Familiarity with Cypress for end-to-end testing to automate user flows and ensure application stability across releases.

• Jenkins: Knowledge of Jenkins for continuous integration and continuous deployment (CI/CD) pipelines, enabling automated build, test, and deployment processes.

• Jira: Experience using Jira for agile project management, including sprint planning, issue tracking, and collaboration with cross-functional teams.

• React Hooks: Deep understanding of React Hooks for managing state and side effects in functional components, improving code readability and reusability.

• Apollo GraphQL: Experience with Apollo GraphQL client for managing data fetching and caching in React applications, enhancing performance and developer experience.

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