Backend Developer - Design & Math

Yggdrasil Gaming Ltd; Kraków; On-site; PLN 120,000 - 180,000; Full time

Job summary

Yggdrasil Gaming Ltd. is seeking a backend developer to design and implement game logic and mathematical models for Game in the Box solutions in Kraków, Poland. You will work on backend systems, ensure proper integration with other components, and contribute to project teams with robust test coverage.

The role requires 2–3 years of backend experience, strong mathematics, and a passion for games. You will operate in an agile, cross-functional environment and communicate effectively in English.

Qualifications

• 2–3 years commercial backend development experience (Java/Kotlin/TypeScript/Node.js or C#).
• Strong mathematical skills including probability, statistics, and algorithms.
• Ability to build, run, and interpret simulations.
• Hands-on experience with unit and integration testing.
• Good collaboration in agile, cross-functional teams.
• Good command of English (written and spoken).
• Genuine passion for games and delivering high-quality software.

Responsibilities

• Develop the backend and mathematical models for Game in the Box solutions, including game logic and integration with other components.
• Maintain and develop game designs used in projects.
• Implement new game-related functionalities and test coverage.
• Prepare and execute unit and integration tests.
• Collaborate with project teams and developers on integration and implementation.

Skills

Backend development

Mathematics

Testing

Agile collaboration

English proficiency

Job description

• Developing the backend and mathematical models for Game in the Box solutions, including implementation of game logic, computational systems, and integration with other system components;
• Maintaining and developing game designs used in projects;
• Implementing new game-related functionalities;
• Preparing and executing unit and integration tests;
• Designing game functionalities in accordance with licensing regulations;
• Designing and developing game mechanics and game projects supporting ongoing initiatives;
• Creating project and technical documentation;
• Collaborating with project teams and developers on the integration and implementation of game projects;
• Conceptualising and implementing new game projects within defined requirements and constraints;
• Verifying the correctness of game designs, ensuring their alignment and optimisation;
• Analysing game-related data to identify new mechanics and industry trends;
• Evaluating game performance after deployment and providing insights into player behaviour;
• Conducting analyses to detect irregularities and proposing corrective solutions.

Qualifications:

• 2-3 years of commercial backend development experience (e.g. Java/Kotlin/TypeScript/Node.js or C#)
• Strong mathematical skills, including a solid understanding of probability, statistics, and algorithms
• Mathematical intuition and the ability to build, run, and interpret simulation results
• Hands-on experience with unit and integration testing
• Strong collaboration skills and experience working in agile, cross-functional teams
• Good command of English (written and spoken)
• Genuine passion for games and commitment to delivering high-quality software

Nice to have:

• Experience with backend development for online casino / iGaming products
• Familiarity with video slot mechanics and slot math models (RTP, volatility, hit frequency, pay tables)
• Experience designing game mechanics or mathematical models for games
• Ability to test and validate mathematical outcomes using MS Excel, programming, and proprietary tools to guarantee accuracy and quality
• Understanding of Docker and containerization
• Understanding of licensing and regulatory requirements in regulated gaming markets
• Ability to test and validate mathematical outcomes using MS Excel, programming, and proprietary tools to guarantee accuracy and quality