Senior Frontend Software Engineer

Xsolla

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Location: Serbia
Job Type: full-time
Work Format: 🌍 Remote
Salary: Unknown
Posted: July 14, 2026

Job Description

We are looking for a Senior Frontend Software Engineer who is innovative, detail-oriented, and highly collaborative to join our Engineering team. The ideal candidate is someone who thrives in a fast-paced, exceptionally dynamic setting and is passionate about building high-performance, scalable user interfaces that power the global video game commerce ecosystem.

Strong proficiency in React and the modern TypeScript ecosystem is essential. You should have a deep understanding of state management (Redux, Zustand), modern build tools, and the ability to architect clean, maintainable frontend systems. Since we operate at a global scale, experience with performance optimization, responsive design, and cross-browser compatibility is key. We value engineers who don't just write code but own the entire lifecycle—from designing intuitive UIs to maintaining robust CI/CD pipelines and ensuring seamless cloud deployments.

If you are a problem-solver who loves troubleshooting complex system behaviors and is excited to mentor fellow engineers while driving technical strategy, we want to hear from you! If you're ready to build the seamless digital experiences that help indie and AAA developers fund, market, and monetize their games worldwide, join us at Xsolla.

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 all the things needed to enjoy the game.

RESPONSIBILITIES

Design and implement new features and user interfaces
Write clean, maintainable, and well-tested code
Optimize applications for maximum speed and scalability
Participate in code reviews and maintain code quality standards
Troubleshoot and debug issues across browsers and devices
Build/maintain CI/CD pipelines for frontend applications
Work closely with global cross-functional teams, including developers, QA engineers, and project managers.
Partner with stakeholders to align technical strategies with business objectives.
Facilitate effective communication across globally distributed teams.
Oversee the entire development lifecycle, ensuring on-time delivery of high-quality applications.

QUALIFICATIONS & SKILLS

5+ years of experience in frontend development with a strong focus on React
Deep proficiency in JavaScript/TypeScript, HTML, and CSS
Strong experience with state management solutions (Redux, Zustand, or Context API)
Solid understanding of RESTful APIs and GraphQL
Experience with modern build tools (Webpack, Vite) and monorepo setups
Excelent understanding of responsive design, cross-browser compatibility, and performance optimization
Experience with testing frameworks (Jest, React Testing Library, Cypress)
Hands-on experience with CI/CD tools (GitHub Actions, GitLab CI, Jenkins, or CircleCI)
Familiarity with containerization (Docker) and cloud deployment (GCP, AWS, Firebase)
Proven ability to mentor and lead other engineers as a senior on the team
Excellent communication and collaboration skills
Strong problem-solving skills and attention to detail

Benefits:

We are passionate about fostering a supportive environment for our team, so we prioritize the physical, mental, and emotional well-being of our employees through a comprehensive Benefits Program. This includes unlimited Flexible Time Off and a personalized career roadmap for each employee. By investing in professional development through training and educational opportunities, we ensure that our team thrives both personally and professionally. Together, we’re not just building a business; we’re cultivating a community that values creativity, collaboration, and the transformative power of play.

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.

By submitting your application, you consent to Xsolla conducting background checks, where permitted by law, after the final interview stage. All checks will comply with local regulations, and your information will be handled confidentially.

Xsolla takes your privacy seriously and will not sell or externally distribute any personal data received during the hiring process. In accordance with applicable data protection laws, Xsolla is committed to protecting your personal information and respecting your privacy.

🎯 Who is this job for?

This role is best suited for a Senior Frontend Software Engineer with 5+ years of experience building scalable, high-performance React applications and leading frontend development. The candidate should be proficient in React, TypeScript, JavaScript, HTML, CSS, Redux/Zustand, REST APIs, GraphQL, Webpack, Vite, Jest, Cypress, CI/CD, Docker, AWS/GCP/Firebase, and performance optimization. They should be familiar with architecting frontend systems, developing responsive and cross-browser user interfaces, maintaining deployment pipelines, mentoring engineers, collaborating with cross-functional teams, and driving technical decisions from design to production.

💬 Potential Interview Questions

How would you architect a large-scale React application to ensure scalability, maintainability, and developer productivity?
Answer: I would organize the codebase by feature modules, separate UI, business logic, and data access, use reusable components and custom hooks, enforce strict TypeScript typing, and establish consistent architectural patterns and coding standards.
When would you choose Redux, Zustand, or Context API for state management?
Answer: Context API is suitable for simple shared state, Zustand is ideal for lightweight global state with minimal boilerplate, and Redux Toolkit is the best choice for complex applications requiring predictable state updates, middleware, and advanced debugging.
How do you identify and optimize performance bottlenecks in a React application?
Answer: I use React DevTools Profiler to detect unnecessary re-renders, apply code splitting and lazy loading, optimize bundle size, virtualize large lists, and memoize components only where profiling shows a measurable benefit.
What are the advantages and trade-offs of GraphQL compared to REST?
Answer: GraphQL allows clients to fetch exactly the data they need through a single endpoint, reducing over-fetching, while REST is simpler to implement, easier to cache, and often better suited for resource-oriented APIs.
How would you organize a monorepo for multiple frontend applications and shared libraries?
Answer: I would use tools like Turborepo or Nx, separate applications and shared packages clearly, centralize TypeScript, ESLint, and testing configurations, and optimize builds with caching and incremental execution.
What testing strategy would you implement using Jest, React Testing Library, and Cypress?
Answer: I would write unit tests for utilities and hooks, component tests with React Testing Library to validate user behavior, and Cypress end-to-end tests for critical user journeys integrated into the CI pipeline.
How would you build a robust CI/CD pipeline for a React application?
Answer: The pipeline should run linting, formatting, type checking, unit and integration tests, build verification, security scans, and automated deployments with rollback capabilities and production monitoring.
How do you ensure cross-browser compatibility and responsive design?
Answer: I follow web standards, use semantic HTML, responsive layouts with Flexbox and Grid, test across supported browsers and devices, and leverage automated visual regression and accessibility testing.
How would you deploy a React application using Docker and a cloud platform such as AWS or GCP?
Answer: I would containerize the application with Docker, automate builds through CI/CD, deploy behind a CDN or load balancer, configure environment variables securely, and monitor application health after deployment.
As a senior engineer, how do you mentor other developers while maintaining high engineering standards?
Answer: I lead by example through code reviews, architecture discussions, and pair programming, encourage knowledge sharing, provide actionable feedback, and help the team understand the reasoning behind technical decisions rather than just enforcing standards.

📋 Job Summary

Xsolla is a global gaming commerce platform that empowers over 1,500 game developers to fund, distribute, market, and monetize their games worldwide. As a Senior Frontend Software Engineer, you'll design and build scalable user interfaces using React, TypeScript, Redux/Zustand, GraphQL, Webpack/Vite, Jest, Cypress, Docker, and AWS/GCP, while driving frontend architecture, mentoring engineers, and improving performance across global products. This is a full-time remote role based in Serbia, offering flexible time off, personalized career development, and a collaborative engineering culture focused on innovation and technical excellence. If you're passionate about building high-impact products for the gaming industry and leading modern frontend development at scale, Xsolla is an exciting place to grow your career.