Senior Frontend Engineer

Job Description:Company DescriptionWe Dream. We Do. We Deliver.At Merkle, a dentsu company, we power the experience economy. Whether we're building the next great app, running CRM at scale for global brands, delivering technology architectures that support millions of users, or providing world-class data, identity, and insights solutions, it's all in the name of crafting experiences that set brands apart from the competition. Backed by dentsu's legacy of innovation and creativity originating in Japan, we've spent over 35 years helping brands build loyalty, drive growth, and connect meaningfully with their audiences. We've been named a global "Leader" by top industry analyst firms in categories as wide-ranging as digital transformation and commerce, experience design, engineering and technology integration, digital marketing, data science, CRM and loyalty, and customer data management. Why choose Merkle?Innovation at Our Core:As part of dentsu's global network, Merkle pushes the boundaries of customer experience, integrating creativity, technology, and data to drive real-world impact. For over 35 years, we've been innovating to meet the changing needs of our clients. Global Reach with Local Expertise:With over 16,000 employees across 30+ countries, and part of a 70,000 employees' network at dentsu, Merkle blends global insights with a deep understanding of local markets to deliver personalized, effective solutions. Collaborative Culture:At Merkle, your ideas and contributions truly matter. You'll join a team that fosters innovation, collaboration, and creative problem-solving. Together, we work on impactful international projects, making meaningful connections every step of the way. Job Description Developing new user-facing features using React / Angular / or Vanilla JS Building reusable components and front-end libraries Translating designs and wireframes into high-quality code Optimization of components for maximum performance across a vast array of web-capable devices and browsers Design front-end architectures for component library integration with multiple platforms QualificationsRequired Qualifications At least 4 years of Information Technology experience Experience with HTML5 and CSS3 / SCSS Experience with one of the major JS libraries or frameworks (React/Nextjs, Vue/Nuxt) Knowledge and experience with full software development lifecycle Experience with Lean / Agile development methodologies Experience with Optimisations on an existing component library (APIs, component Library, …) Hands-on mentality when needed on bug fixes, backlog, support tickets A good sense for User Experience and Design as a whole Ability to establish good communication flows between stakeholders, designers and developers in the team. Knowledge about Overall Frontend Architecture Evaluation and Scalability Ability to understand business requirements and translate them into technical requirements Ability to work in diverse teams German and English professional proficiency Preferred Qualifications Strong proficiency in JavaScript and TypeScript, including DOM manipulation and the JavaScript object model Thorough understanding of React / Angular / and its core principles Experience with popular React / Angular / workflows (such as Redux / NgRx / Vuex) Familiarity with newer specifications of ECMAScript Familiarity with RESTful APIs Familiarity with modern frontend build pipelines and tools Experience with common frontend development tools such as Babel, Webpack, NPM, etc. Experience with Implementation and development around motion, a11y, design tokens, theming and more A Mindset for benchmarking and optimisation Familiarity with code versioning tools (GIT based) Experience with Design Systems implementation most valued Work visa sponsorship is not available. For local documentation (NIF, NISS), please consult Portuguese authorities. Additional InformationBenefits and perks:25 vacation days Enjoy 2 additional volunteering days to support your passion project Mental Health: Benefit from 3 extra wellness days on top of your vacation days and a Mental Health First Aider and Employee Assisstance program to support your well-being Health insurance (also possible for family members) Cutting Edge Technology & Latest IT tools Software-house environment Agile and Flexible working hours Hybrid work system (remote friendly) Digital nomad policy Focus on career development Full access to Dentsu Academy, our global online learning platform Beers, foosball, and ping-pong #workhardplayhard Free breakfast every second Tuesday of the month Employee discounts Team & Company events Referral bonus program At dentsu, Diversity, Equity, and Inclusion (DEI) is central to our vision: "To be at the forefront of people-centered transformations that shape society." We cherish the unique talents and perspectives of all individuals, welcoming applicants regardless of gender, gender identity, nationality, religion, ethnicity, cultural background, sexual orientation, age, physical or mental ability. By embracing diverse perspectives, we create meaningful change and sustainable growth for our people, clients, and society. Our hiring decisions are guided by qualifications and role-specific requirements, ensuring a workplace free from discrimination and harassment. Location:Lisbon Brand:Merkle Time Type:Full time Contract Type:Permanent