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November 3, 2026
Senior Full-Stack Engineer (JavaScript/PHP)
Senior • On-site
149,977 - 278,530 PLN/yr
Krakow, Poland
Quick Facts
Role: Senior Full-Stack Engineer (JavaScript/PHP)
Description
You will work in an agile environment to develop and expand social systems and gameplay mechanics for social casino experiences. The role includes implementing JavaScript frontend functionality for iOS, Android, and Web, building PHP backend services and REST APIs, and owning features from concept to release and monitoring.
Responsibilities
Develop and expand social systems and gameplay mechanics end-to-end (from concept to implementation and monitoring).
Implement frontend functionality in JavaScript for iOS, Android, and Web.
Build and evolve backend services and APIs in PHP to support gameplay, social, and LiveOps features.
Design scalable REST API interfaces used by client applications.
Co-create data models and mechanisms for player progress, rewards, and events.
Optimize backend performance for high concurrency and large user volumes.
Ensure high quality, reliability, and testability of delivered features.
Analyze and optimize frontend and backend performance for smooth player experiences.
Collaborate with Product Management to define technical solutions and make pragmatic design decisions.
Monitor outcomes after release and iterate based on user behavior and analytics.
Turn creative ideas into engaging, scalable systems.
Identify opportunities to improve architecture, tooling, and software delivery processes.
Requirements
Degree in Computer Science or equivalent professional experience.
At least 4 years of professional software development.
Practical production experience with JavaScript.
Production experience building backend services.
Experience designing and integrating REST APIs.
Knowledge of client-server architecture.
Experience delivering features across the full software development lifecycle.
Analytical thinking and problem-solving with an emphasis on end-user needs.
Benefits
Competitive compensation package tied to results and individual impact.
Potential eligibility for annual bonuses, health and well-being benefits, paid time off, retirement programs, insurance coverage, and other local/statutory benefits depending on role and location.
Compensation and benefits details will be discussed during the recruitment process.
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