Senior React Engineer

Lisbon, Portugal
Senior (4-6 Years)
Hybrid
English Required

What is this challenge about

  • Develop modern, production-ready React and TypeScript applications following existing frontend architecture and architectural guidelines.
  • Transform complex architectural concepts into reusable React components, maintainable interaction patterns, and data-driven interfaces.
  • Build complex workflows for fleet management, deployment, operational monitoring, and intralogistics.
  • Integrate frontend applications with backend REST APIs, handling asynchronous data, loading states, error states, data synchronization, and user permissions.
  • Transform complex, large datasets into intuitive, data-dense interfaces, operational monitoring interfaces, dashboards, KPI visualizations, and analytics views with filtering, aggregation, and drill-down capabilities.
  • Write high-quality, secure code daily as a hands-on developer, developing complete features independently and debugging browser, frontend, and API integration issues.
  • Maintain and improve software quality through unit testing, integration testing, end-to-end testing, static analysis, dependency management, code reviews, and refactoring.
  • Optimize browser rendering, frontend performance, and usability while balancing information density and avoiding technical debt.
  • Contribute to component-driven development and the team's design system.
  • Collaborate closely with Product, Backend, DevOps, QA, and Robotics teams within an Agile development environment.

What we are looking for

  • 5+ years of advanced expertise in React, TypeScript, and modern JavaScript.
  • Proficiency in Tailwind CSS, HTML5, CSS3, responsive design, adaptive UI development, and component-driven development.
  • Deep experience handling real-time, high-frequency WebSockets, as well as REST and GraphQL APIs, asynchronous data handling, frontend state management, and data synchronization.
  • Proven ability to optimize browser rendering and UI performance, processing fast-streaming data without blocking the UI thread.
  • Experience building operational monitoring interfaces, analytics views, KPI visualizations, and data-dense dashboards.
  • Demonstrated knowledge of core software engineering practices, including clean code, maintainability, refactoring, secure coding, performance optimization, error handling, and observability.
  • Hands-on experience with automated testing practices, including unit testing, integration testing, and end-to-end testing (e.g. Jest/Vitest, Cypress or Playwright).
  • Proficiency with modern development tools, including Git, pull requests, CI/CD pipelines, modern build tools, package managers, and dependency management.
  • Experience working with Docker and containerized development environments within Agile product teams.

We connect IT professionals with projects that match their skills, professional experience, and goals, then we offer a career progression program, delivered by in-house specialists - our People Experience Partners - to guide them through our journey with us.

What we offer:

  • A project that matches your skills and ambitions, as well as your preferences for working policies and culture.
  • A competitive salary with awesome benefits and opportunities to leverage your knowledge and network to earn additional income.
  • An empowering and respectful work culture enriched with social and learning events.
  • A People Experience Partner specially assigned to you - your go-to career guide, responsible for supporting your growth, facilitating training, and ensuring your work-life balance at KWAN.
At KWAN, they make sure that I feel comfortable with the client I’m working for and that what I’m doing aligns with my career aspirations.
Luis Caldeira, DevOps @ KWAN
At KWAN, I’m given the space to be myself and do what I love. I have control over the projects I work on, as well as the direction of my career.
Pedro Fonseca, Front End Developer @ KWAN
I see my People Experience Partner as someone who is always available to provide me with motivation and constant feedback, which helps me be sure that I am in the right place.
Josimar dos Reis, Software Developer @ KWAN
I know that I’ve contributed to the growth of a company that truly values a “people first culture”, because my ideas, experiences, and individuality were always appreciated.
João Nascimento, Software Developer (KWAN Alumni)
My two years at KWAN were an incredible experience! From the start, I was welcomed into a warm and collaborative environment where I felt truly supported.
Laís Ortiz, Software Developer @ (KWAN Alumni)
Grab this opportunity, apply now!

What You Can Expect as a KWANer

Respect isn’t optional here

You’re trusted to deliver and supported to speak up.

Dedicated People Experience Partner

Someone accountable for your growth, not your allocation.

Continuous learning, built in

Learning that keeps pace with the systems you build.

Recognition that’s visible

Your impact doesn’t go unnoticed. Through our Rocket Points System, we constantly recognize your contributions.

A culture you can feel

From movie and quiz nights to dinners and our annual summer gathering, we don’t just work together - we build real connections.

Flexible spaces to work your way

Remote-first, with physical hubs when you want connection.

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We review every application. If there’s alignment, we won’t let it get lost in a database.