ZEAL Network SE is a leading international provider of online lottery products, operating for over 20 years with brands like LOTTO24 and Tipp24. As Germany’s largest digital lottery operator and a trusted partner of Spain’s ONCE, we are passionate about shaping the future of lottery experiences. Traumhausverlosung is one of ZEAL’s newest and most exciting brands. It gives players the chance to win stunning, fully furnished dream homes through an accessible, thrilling lottery format, while supporting a good cause. Every ticket sold not only offers participants the opportunity to transform their lives, but also contributes to charitable projects, making a real difference in communities across Germany. By combining the excitement of winning with a meaningful social impact, Traumhausverlosung reflects ZEAL’s commitment to innovation, social responsibility, and offering customers more than just a game, but a chance to do good while dreaming big. We are looking for a Senior Full Stack Next.js Developer to join our small development team, contributing to customer-facing features and helping to optimize our conversion funnels. Your tasks: Develop and maintain our webshop using Next.js Work closely with product, design, marketing and tech teams in a very lean and agile environment (startup mentality) Integrate RESTful APIs in coordination with Backend Developers Ensure technical implementation of UI/UX designs meets quality standards Write and maintain tests for functionality, security and performance Support deployment automation alongside our DevOps team Contribute to performance optimization and conversion rate improvements Participate in measuring and iterating on product features What you offer us: A passion for web development with an up-to-date tech stack using React Strong JavaScript fundamentals and React expertise Experience working with Next.js (App Router, Server Functions, Server Components), TypeScript, and HTML5/CSS3 Hands-on experience with modern frontend tools around React, such as Tailwind CSS, React Hook Form, TanStack Query, Zod, shadcn and Lucide Experience implementing responsive, mobile-first designs “You build it, you run it” mindset and experience in deploying, monitoring, and maintaining a web application Strong in writing performant code and clean architectures Experience integrating and working with REST APIs Understanding of web performance optimization techniques Ability to translate business requirements into technical solutions Strong communication skills for effective team collaboration Proactive approach to knowledge sharing and peer support What we offer: State-of-the-art technologies and an agile environment (Check our Tech Radar: https://lotto24.github.io/tech-radar/ ) A modern, dynamic culture grounded in the success of a leading-edge e-commerce company. A talented team of ambitious, like-minded colleagues where your knowledge and ideas truly make an impact. Ongoing personal growth, supported by an annual development budget of €1,500 to invest in your professional development. Trust and autonomy, no micromanagement, just confidence in your ability to deliver and excel. Flexible work options with a hybrid setup focused on results. Unlimited vacation days in addition to your yearly 30-day vacation allowance. Opportunity for workations abroad using our WorkFlex tool. Monthly mobility allowance of €30 to use on the mobility option of your choice (e.g., the Deutschlandticket), plus access to a company bike leasing program. Company pension scheme, provided in partnership with Degura, to support your future financial security. Subsidized EGYM WELLPASS membership, with a contribution of only €25 per month, giving you access to a wide range of gyms and sports options across Germany. Quarterly company events, along with regular team activities and informal gatherings, a favorite being our Healthy Tuesday lunches or Treat Thursdays in the office!