We are seeking an experienced .NET Developer to design and develop robust game engines and testing frameworks. You will work closely with product managers and mathematicians to translate complex requirements into scalable, efficient solutions. This role involves both building core systems and ensuring their quality through rigorous testing, with a strong focus on performance, maintainability, and innovation.This is a hybrid position based in Krakow with on-site work required three times a week.What You'll Do Design, build, and maintain high-quality .NET code to power game engines and related systems. Collaborate with product managers to define feature requirements, technical specifications, and implementation plans. Work with mathematicians to translate mathematical models into efficient, production-ready code. Develop and automate tests to ensure the reliability and accuracy of game logic and engine behavior. Participate actively in problem analysis, solution design, and feature planning. Contribute to architectural decisions to ensure scalability, performance, and long-term maintainability. Work within a sprint planning, code reviews, and continuous improvement. Troubleshoot, debug, and optimize systems for maximum efficiency. What We're Looking For Proven experience as a .NET Developer (C#, .NET 6 or later preferred). Strong background in software engineering principles and design patterns. Experience developing high-performance systems such as game engines, simulations, or complex logic-based platforms. Solid understanding of automated testing frameworks and methodologies. Ability to collaborate effectively with non-technical stakeholders, including product managers and mathematicians. Strong problem-solving skills and ability to translate abstract ideas into concrete implementations. Familiarity with Scrum/Agile development practices. Excellent communication and teamwork skills. Nice to Have Background in gaming, simulations, or similar interactive systems. Knowledge of cloud-based deployment and Microservices knowledge. What We offer: High-level compensation on an employment contract, regular performance based salary and career development reviews; Medical insurance (health), employee assistance program; Multisport Card; English classes with native speakers, trainings, conferences participation; Referral program; Team buildings, corporate events. Why Aristocrat?Aristocrat is a world leader in gaming content and technology, and a top-tier publisher of free-to-play mobile games. Aristocrat has three operating business units, spanning regulated land-based gaming (Aristocrat Gaming), social casino (Product Madness), and regulated online real-money gaming (Aristocrat Interactive). Our team of over 7,300 employees worldwide is united by our company’s mission to bring joy to life through the power of play.We deliver great performance for our B2B customers and bring joy to the lives of the millions of people who love to play our casino and mobile games. And while we focus on fun, we never forget our responsibilities. We strive to lead the way in responsible gameplay, and to lift the bar in company governance, employee wellbeing and sustainability. We’re a diverse business united by shared values and an inspiring mission to bring joy to life through the power of play.Aristocrat is proud to be an equal opportunity employer.We celebrate diversity and do not discriminate based on gender, race, religion, color, national origin, sex, sexual orientation, age, veteran status, disability status, or any other applicable characteristics protected by law. Diversity and Inclusion are integral to our values of Talent Unleashed, Collective Brilliance, Good Business, Good Citizen, and It’s All About the Player.