(Senior) Backend Software Engineer (f/m/d)

ZEAL Network SE is a dynamic, international group of companies that has been creating exciting and innovative lottery experiences for over 20 years. As Germany’s largest provider of online lotteries through our brands LOTTO24 and Tipp24, and a trusted partner of Spain’s ONCE, the second-largest national lottery, we’re shaping the future of the lottery industry. We are passionate about driving innovation, as demonstrated by our newest brands, Freiheit+ and Traumhausverlosung, which bring fresh and exciting dreams to life. Additionally, through ZEAL Ventures, we invest in inspiring e-commerce start-ups like Omaze and DAYMADE, fueling fresh ideas and opportunities.

Our team of 350+ professionals from diverse backgrounds is united by a visionary mindset, a passion for collaboration, and a commitment to inspire dreams. At ZEAL, we empower our people to think ambitiously and work together toward a shared purpose: helping people imagine and achieve their aspirations.

As a (Senior) Backend Software Engineer (f/m/d) in our Games Team, you’ll help build and evolve the technical foundation that powers our slot games, scratchcards, and instant-win experiences. This team is responsible for the services that orchestrate gameplay, game state, results, and player interactions across our portfolio. We are looking for an experienced engineer with a passion for high-quality backend systems, written primarily in Go (Golang), and a keen eye for scalability, reliability, and product value.

Your tasks:

• Design and develop scalable, robust backend services and APIs in Go, supporting gameplay logic, session handling, result generation, and state management.

• Work in a cross-functional product team alongside game developers, frontend engineers, QA specialists, and product managers to deliver features end-to-end.

• Ensure services are secure, performant, and maintainable, with appropriate test coverage and observability.

• Collaborate on system design and architectural decisions, helping evolve our platform to meet future game and business needs.

• Integrate third-party systems and tools where necessary, ensuring seamless connectivity and data flow.

• Monitor, troubleshoot, and continuously improve the performance and reliability of our services in production.

• Embrace a mindset of continuous improvement, sharing knowledge and contributing to a strong engineering culture.

What you offer us:

• Proven experience in backend software development, with strong proficiency in Go (Golang).

• Solid understanding of microservices architecture, API design, and backend system interactions.

• Experience working with containerized services (Docker, Kubernetes) and modern deployment workflows.

• Hands-on experience with observability, infrastructure as code, and event-driven systems (e.g., working with tools like Kafka, Prometheus, Grafana, Helm, Argo CD, or similar).

• Ability to write clean, testable, and well-documented code, and a track record of owning services in production.

• A collaborative, product-oriented mindset—you enjoy working in a team and contributing to the broader business goals.

• Strong communication skills in English and a proactive attitude.

• Experience in e-commerce environments, especially systems with transactional integrity, pricing, or inventory mechanics are a plus.

• Familiarity with game platforms, real-time systems, or regulated digital products would be a nice-to-have.

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.

• Monthly company events, team activities, and informal gatherings, including our popular company-wide lunches provided four days a week.

Not ticking every box or think you’ve got that unique set of skills we haven’t realized we need? Get in touch anyway, we’re always looking to add great people!