Senior Frontend Engineer (Fixed Term Contract)

Location: UK or Portugal

Department: Engineering

Employment: 3 Month Fixed Term Contract

Start date: Beginning of January 2026

About YLD: Everything we do is to empower our clients to move forward. Our purpose is to help our clients develop the capabilities they need to outperform their competitors. Our success is a consequence of ensuring our clients are successful. Our company is built on extraordinary people; we aim to attract, inspire, develop and retain them. YLD is a software engineering and design consultancy; we create digital capabilities for our clients that last beyond our engagement. We have offices in London, Lisbon, Porto.

About the role: As a Frontend Engineer, you’ll have the opportunity to build and deliver software within interesting projects in terms of the product and methodology. We work in an Agile environment (Scrum) with a test-first mindset (actually, writing code without tests should be unthinkable). We are also big advocates of pair programming and nothing is released until we have a code review. If you are a proactive, adaptable, and enthusiastic engineer with experience in JavaScript, the web and a passion for leveraging multiple technologies to build exceptional solutions, we encourage you to apply. Join our team and contribute to developing innovative products that make a difference in the industry.

Technical competencies:

• Commercial experience of working with React and Node;
• In-depth knowledge of CSS in its multiple applications (Tailwind, CSS in JavaScript, CSS Modules, etc);
• Thoughtful about Component composition and state management, with experience in multiple patterns (e.g. MobX, Redux, Context, etc);
• Knowledge and experience with the up-to-date transpiling, bundling, and packaging ecosystem (e.g. esbuild, vite, yarn, turborepo, etc);
• Experience with documentation generation tools, both for libraries and for components;
• Opinionated and experienced with linting and formatting tools;
• Strong and vast experience with Continuous Integration and Delivery, as well as Infrastructure as Code tools and techniques;
• Experience in testing your products with Unit, Integration, End to End, and Visual Regression tests;
• Used to design tools (e.g. Figma) and its API and integration tools;
• Extensive experience working with Design Systems;
• Knowledge of Typescript.

Non-Technical competencies:

• Self-motivated, proactive and continually looking for ways to improve and develop yourself;
• A good communicator, both in writing and verbally. You’ll be able to explain technical ideas and concepts in business-friendly language;
• Detail oriented;
• Used to working in a team-oriented, collaborative environment;
• Analytical and problem-solving oriented;
• A genuine believer in diversity and fairness.

What you’ll get in return: The chance to work with a forward-thinking, ethical, and fun group of people and to develop and grow your skills in a fast-moving business

Our typical Recruitment Process looks like this:

• 1st Interview with someone from the Talent team (30/45 mins)
• Technical Interview with our Senior Developers (1h30)
• Meet and discuss with a Client Partner (15/30mins)

We live and breathe our values, and know you will too:

• Growing every day
• Including everyone
• Relationships built on honesty and ethics
• Inspiring solutions
• Winning together

We’re an equal-opportunity employer and value diversity of all kinds. We don’t discriminate based on race, religion, colour, national origin, gender, sexual orientation, pregnancy or maternity, age, marital status, or disability status. We also believe in work-life balance and offer flexible working around our core hours.