Senior Frontend Engineer

Job Description: About the Role We are seeking a Senior Frontend Engineer with deep expertise in JavaScript/TypeScript, Next.js, and React.js to join our growing engineering team. Reporting to the CMS Technical Director, you will have a strong track record in building scalable, performant, and maintainable web applications while delivering pixel-perfect, accessible, and high-quality UI components. Key Responsibilities Develop & maintain high-performance web applications using Next.js, React, and TypeScript. Implement responsive, pixel-perfect UI components based on design system guidelines. Integrate APIs (REST, GraphQL) and optimize CRUD operations for performance and scalability. Work with headless CMS platforms (e.g., Contentful) for content management and personalization. Ensure cross-browser compatibility, web accessibility (WCAG standards), and SEO best practices. Collaborate with UI/UX designers, backend engineers, and product teams to build intuitive, frictionless experiences. Optimize performance through Lighthouse audits, caching strategies, and Core Web Vitals improvements. Write clean, well-documented, and testable code, following modern best practices. Conduct code reviews, contribute to technical discussions, and mentor junior developers. Work in an Agile/Scrum environment, contributing to sprint planning, retrospectives, and stand-ups. Required Skills & Experience 5+ years of front-end development experience focusing on JavaScript/TypeScript. 3+ years of hands-on experience with Next.js and React.js in production. Advanced CSS skills, including CSS Modules, SCSS, PostCSS, and responsive design principles. API Integration & CRUD Operations: Expertise in RESTful APIs and GraphQL. Headless CMS Experience: Strong background in Sitecore, Contentful, Optimizely, Sanity, or similar CMS platforms. Web Performance & Optimization: Experience with Lighthouse, Core Web Vitals, caching strategies, and performance monitoring. Testing & QA: Proficiency in Jest, Cypress, Playwright, and UI testing strategies. Version Control & CI/CD: Experience with Git (GitHub/GitLab/Bitbucket), automated testing, and cloud deployments (Vercel, AWS, Netlify, or Cloudflare Pages). Design Systems: Experience with Storybook, Material UI, TailwindCSS, or Radix UI. The annual salary range for this position is $68,000 - $110,000. Placement within the salary range is based on a variety of factors, including relevant experience, knowledge, skills, and other factors permitted by law. Benefits available with this position include: • Medical, vision, and dental insurance, • Life insurance, • Short-term and long-term disability insurance, • 401k, • Flexible paid time off, • At least 15 paid holidays per year, • Paid sick and safe leave, and • Paid parental leave. Dentsu also complies with applicable state and local laws regarding employee leave benefits, including, but not limited to providing time off pursuant to the Colorado Healthy Families and Workplaces Act, in accordance with its plans and policies. For further details regarding Dentsu benefits, please visit To begin the application process, please click on the “Apply” button at the top of this job posting. Applications will be reviewed on an ongoing basis, and qualified candidates will be contacted for next steps. At dentsu, we believe great work happens when we’re connected. Our way of working combines flexibility with in-person collaboration to spark ideas and strengthen our teams. Employees who live within a commutable distance of one of our hub offices, currently located in Chicago, metro Detroit, Los Angeles, and New York City, are required and expected to work from the office three days per week (two days per week for employees based in Los Angeles). Dentsu may designate other Hub offices at any time. Those who live outside a commutable range may be designated as remote, depending on the role and business needs. Regardless of your work location, we expect our employees to be flexible to meet the needs of our Company and clients, which may include attendance in an office. Location: USA - Remote - Illinois Brand: Merkle Time Type: Full time Contract Type: Permanent Dentsu is committed to providing equal employment opportunities to all applicants and employees. We do this without regard to race, color, national origin, sex , sexual orientation, gender identity, age, pregnancy, childbirth or related medical conditions, ancestry, physical or mental disability, marital status, political affiliation, religious practices and observances, citizenship status, genetic information, veteran status, or any other basis protected under applicable federal, state, or local law. Dentsu is committed to providing reasonable accommodation to, among others, individuals with disabilities and disabled veterans. If you need an accommodation because of a disability to search and apply for a career opportunity with us, please send an e-mail to View email address on click.appcast.io by clicking on the link to let us know the nature of your accommodation request and your contact information. We are here to support you. Can’t find a suitable job? Sign up for job alerts tailored to your interests and be first in line for new opportunities. About dentsu For over 120 years, innovation has been a core tenet of our offering – exploring new ways to reach, engage and nurture relationships with audiences. Together we drive a multiplier effect for clients at a global scale, through the development of Integrated Growth Solutions that are underpinned by our promise to clients: innovating to impact. Be a force for good. Sustainability is a vital part of our business and an important area of focus for our clients. We’re leading the way – helping to build a more sustainable planet. Dream loud. In this moment of transformation, we need our people to be fearless, embracing change and ambiguity, driven by the love for their work and excitement for the future. Team without limits. We create opportunities for connection and collaboration between our colleagues and clients, building a sense of belonging and having some fun along the way. Find out more about us Who we are Our Social Impact Our work