Senior UI / Frontend Engineer (React)

Lisbon, Portugal

Senior (4-6 Years)

Hybrid

English Required Not Accepting Candidates Living Abroad

About the role

Robotics software company developing platforms for autonomous mobile robots. The team builds modern, production-grade frontend applications for a robotics software platform that supports fleet management, deployment and monitoring in complex real-world operations such as airports and warehouses. You will work closely with a Frontend Architect and cross-functional teams to turn architectural concepts into high-quality React applications.

What you will do

Develop modern React applications following established architectural guidelines.
Build complex workflows for fleet management, deployment, monitoring and intralogistics use cases.
Develop reusable UI components and contribute to a shared design system.
Improve software quality through automated testing, code reviews and refactoring.
Integrate frontend applications with backend APIs, including real-time data sources.
Optimise frontend performance and usability for data-dense, operational interfaces.
Mentor junior developers and deliver product improvements quickly and reliably.

Location and work model

Hybrid (3 days/week in the office, Lisboa)

What are we looking for?

React — 5+ years
TypeScript
Advanced React patterns
Modern JavaScript, HTML5, CSS3
REST APIs and asynchronous data handling
Frontend state management
Real-time data handling (WebSockets, REST/GraphQL)
UI performance optimisation with high-frequency data
Automated testing: Jest/Vitest and Cypress/Playwright
Git, CI/CD, Docker
English B2

Nice to have

Tailwind CSS and advanced raw CSS
Three.js (React Three Fiber) or Babylon.js
3D math, shaders, gLTF asset optimisation
Design systems, component libraries, Storybook
Accessibility (WCAG)
Figma collaboration

About KWAN

At KWAN, your career is bigger than one project. You join a real team, on a long-term project, at a company where technology is the business. And when you are ready for something new — a new stack, a new industry, a bigger role — we find that next step with you, without you having to start over somewhere else.

From day one you have a dedicated People Experience Partner: one person accountable for your growth, not your allocation. They know where you want to go, and they help you get there.

You keep learning as technology moves (AI included). Your impact is seen and recognised. Pay and expectations are talked about openly. And you work remote-first, with hubs in Lisbon and Porto for when you want people around.

Grow with clarity. Be treated with respect. Build things that matter.

Apply — if your profile is a match for this role, you will hear from our Talent team within 48 hours. If it is not the right match this time, we will reach out as soon as we find a role that fits you better.

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.