At Campeón Gaming, we build the technology behind online casino and sports betting brands. We provide an all-in-one platform that allows our partners to launch, run, and grow their own brand with our engine. From the technology to the day-to-day operations, we support everything needed to make a brand successful. Our platform is fast, flexible, and designed to scale across regulated markets worldwide. Also, we offer managed services such as Payments, CRM, Customer Support, KYC & Fraud, Affiliates, and Casino & Sportsbook Management. This allows our partners to focus on growing their brand, while we support the technology and core operational functions of the platform. But what truly sets us apart is our people. We are a team of 190+ Campeones from 17+ nationalities, bringing together diverse perspectives, ideas, and expertise. Our culture is rooted in being people-first, building trust, embracing meraki, fostering team spirit, and adopting a growth mindset, both as individuals and as a company. We’ve been recognized among the Best Workplaces in Europe 2024, consistently ranked as a Best Workplace in Greece (2021–2025), certified as a Great Place to Work for 6 consecutive years, and awarded as Best Workplace for Women Hellas 2026 and Best Workplace in Tech Hellas 2025. Ready to build this journey together? Your story starts here! About the Role We are currently looking for a motivated Senior Backend Developer to join our team. Responsibilities: * Analyze and implement back-end solutions according to business requirements. * Follow and promote software development design patterns and best practices. * Integrate new gaming and payment providers. Requirements: * BSc in computer science or relevant field. * Fluency in written and verbal English. * Minimum 5 years of experience in backend development. * Minimum 5 years of experience developing in JAVA. * Confidence in RESTful services. * Experience with GraphQL, Redis, Postgres. * Basic Git knowledge. * Ability to work both as an individual and as part of a team. * Experience in the iGaming industry will be considered a plus. * Show initiative to expand knowledge. We got you covered here: * Competitive Salary  * Access to LinkedIn Learning programs as well as funding to educational programs of your choice * Monthly allowance for orders via the Wolt App & free drinks and snacks at the office * Paid educational leave * Hybrid working model * Modern offices in the center of Thessaloniki * 360 feedback for Constant personal and professional development * 6 Company Extra Days off! Diversity, Equity & Inclusion At Campeón Gaming, we believe every story deserves to be heard and valued. We are proud signatories of the Diversity Charter Greece, reinforcing our commitment to a culture of equality, respect, and inclusion. We welcome and celebrate people of all backgrounds, experiences, and perspectives. For us, diversity is not just a principle. It’s a strength that drives innovation, connection, and collective success. Every story deserves a shared journey. Ready to be a Campeόn?