Middle Software Engineer (PHP)

Xsolla; Cis; On-site; PLN 120,000 - 140,000; Full time

Job summary

Xsolla in Poland is seeking a Backend Developer to design, build, and maintain backend services and APIs using PHP and Go. The successful candidate will ensure scalability, reliability, and high performance while contributing to system monitoring and documentation.

Qualified applicants should have proven experience in backend development, a solid understanding of OOP, and familiarity with microservices architecture. Excellent communication and collaboration skills are essential. Join us at Xsolla to work with cutting-edge technologies and dynamic teams.

Qualifications

• Proven experience in backend development with strong proficiency in PHP and GoLang.
• Solid understanding of object-oriented programming (OOP).
• Experience with microservices architecture and scalable systems.

Responsibilities

• Design, build, and maintain backend services and APIs using PHP and Go.
• Develop new microservices to support large-scale integrations.
• Document technical specifications and system architecture.

Skills

PHP

GoLang

Object-oriented programming (OOP)

Microservices architecture

SQL

GitLab

Grafana

Kibana

Tools

Postman

DataDog

Job description

About Us

Xsolla is a global commerce company with robust tools and services to help developers solve the inherent challenges of the video game industry. From indie to AAA, companies partner with Xsolla to help them fund, distribute, market, and monetize their games. Grounded in the belief in the future of video games, Xsolla is resolute in the mission to bring opportunities together, and continually make new resources available to creators. Headquartered and incorporated in Los Angeles, California, Xsolla operates as the merchant of record and has helped over 1,500 game developers to reach more players and grow their businesses around the world. With more paths to profits and ways to win, developers have everything needed to enjoy the game.

Responsibilities

• Design, build, and maintain backend services and APIs using PHP and Go, ensuring scalability, reliability, and high performance.
• Develop new microservices and enhance existing systems to support large‑scale integrations and high‑load payment flows.
• Participate in code reviews and maintain high development standards through collaborative feedback and best practices.
• Work closely with engineering, product, and partner teams to deliver high‑quality solutions on schedule.
• Contribute to system monitoring using tools such as Grafana, Kibana, and ELK to ensure stability and optimal performance.
• Document technical specifications, system architecture, and new functionalities for transparency and maintainability.
• Participate in Kanban ceremonies and maintain efficient communication with cross‑functional teams.

Qualifications & Skills

• Proven experience in backend development with strong proficiency in PHP and GoLang.
• Solid understanding of object‑oriented programming (OOP), software design patterns, and decomposition principles.
• Experience with microservices architecture and scalable backend systems.
• Strong knowledge of SQL and database design, including optimization for large datasets.
• Familiarity with Postman, GitLab, console and other development tools.
• Experience using monitoring and testing tools such as Grafana, Kibana, DataDog and ELK.
• Ability to work independently on complex technical tasks and deliver high‑quality results within deadlines.
• Strong communication skills and ability to collaborate effectively with cross‑functional teams.

Nice to Have

• Experience with high‑load systems and event‑driven architectures.
• Familiarity with CI/CD tools (GitLab CI).
• Background in frontend development or working with single‑page applications (SPAs).
• Hands‑on experience using AI‑powered development tools to enhance productivity.

The duties and responsibilities of this position may evolve over time to support the organization’s goals and individual growth. This job description is intended to outline the general nature and level of work being performed and is not intended to be an exhaustive list of all duties, responsibilities, and qualifications required.