Senior Web Developer

We’re looking for a Senior Web Developer to join our Retail Media team at dunnhumby. You’ll play a key role in integrating innovative, scalable, and high-performance web applications that power retail media solutions for some of the world’s biggest brands and retailers. As part of a cross-functional team, you’ll collaborate with product managers, designers, data scientists, and engineers to deliver seamless digital experiences that help retailers monetize their media assets and drive measurable outcomes for advertisers.

What You’ll Do

As a Senior Web Developer in our Retail Media team, you will:

• Support the technology and integration of our adtech functions, ensuring seamless connectivity with key platforms like Google Ad Manager.
• Regularly test, maintain, and enhance our web frameworks to ensure performance, reliability, and scalability.
• Troubleshoot and resolve technical issues across the stack, from frontend bugs to backend integration challenges.
• Collaborate closely with internal product teams and stakeholders to align technical solutions with business goals.
• Lead the integration of our systems with third-party ad servers and platforms, particularly Google’s adtech ecosystem.
• Contribute to the continuous improvement of our development practices, including code reviews, testing, and deployment automation.
• Mentor junior developers and share knowledge across the team.

• Strong experience with core web technologies: HTML, CSS, and JavaScript.
• Background in the advertising or adtech space, with a solid understanding of digital media workflows.
• Exposure to Google ad platforms, ideally including Google Ad Manager.
• Proven ability to engage and collaborate with stakeholders across product, tech, and commercial teams.
• Familiarity with modern frontend frameworks (e.g., React) and backend technologies (e.g., Node.js) is a plus.
• A proactive mindset with strong problem-solving and communication skills.