Senior Client Engineer - Stumble Guys!

Scopely; Barcelona; On-site; EUR 70,000 - 100,000; Full time

Job summary

Scopely is seeking a Senior Client Engineer to join the Stumble Guys team in Barcelona. You will help design and ship production-grade mobile experiences that reach millions of players worldwide and keep Scopely at the forefront of mobile games.

You will drive game mechanics and system features using Unity and C#, ensure technical performance (crashes, FPS, startup times), and collaborate with design, product, marketing, and backend teams to deliver engaging experiences at scale.

Qualifications

• Must have strong knowledge of C# and/or C++ and game programming languages.
• Extensive experience with game engines, especially Unity or Unreal.
• Familiarity with Photon Quantum is a plus.
• Strong fundamentals in software engineering: design patterns, architecture, robust APIs.
• Solid understanding of mobile networking practices and performance.
• Experience with asynchronous, multi-threaded programming for UI responsiveness.
• Experience in client-side testing (unit/integration).
• Knowledge of game programming patterns and scalable architectures.
• Strong mobile debugging skills (iOS/Android).
• Experience with build tooling (Git, Jenkins).

Responsibilities

• Ship production-grade mobile games used by millions.
• Drive implementation of game mechanics and systems using Unity and C#.
• Develop large, complex new features and improvements.
• Ensure performance metrics (crash rates, FPS, startup times, CPU usage) stay healthy.
• Collaborate with game design, product, marketing and other teams.
• Propose solutions to challenging game development problems.
• Ensure code quality and maintainability across systems.
• Support testing and debugging across mobile platforms.

Skills

C# / C++

Unity

Photon Quantum

Mobile development

Asynchronous programming

Testing (unit/integration)

Game architecture

Performance optimization

Debugging mobile devices

UI responsiveness

Tools

Git

Jenkins

CI/CD tooling

Job description

Scopely is looking for a Senior Client Engineer to join our Stumble Guys Team. At Scopely, we care deeply about what we do and want to inspire play, every day — both through our work environment and through the strong connections we build with our player communities. We are a global team of game lovers developing, publishing, and innovating in the mobile games industry, connecting millions of players worldwide daily.

Stumble Guys is one of our most recent hits, with millions of fans joining the party every day and keeping the game at the top of the charts in more than 50 countries. Our ambition is to build a beloved franchise that players enjoy for many years to come.

What You Will Do

• Ship production-grade mobile games used by millions of gamers
• Drive the implementation of game mechanics and system processes using Unity and C#
• Drive the development of big and complex new features or improvements to existing ones
• Ensure technical performance (crash rates, FPS, startup times, CPU usage, etc) is healthy throughout the development
• Collaborate and communicate with cross-functional departments including game design, product management, marketing, etc.
• Think about and propose solutions to the challenging problems of game development

What We're Looking For

• Strong knowledge of C# and/or C++, or other relevant game-programming language
• Extensive experience and knowledge of game engines, in particular Unity or a similar technology (like Unreal Engine)
• Knowledge of Photon Quantum is a plus
• Strong understanding of the basics of software engineering fundamentals: design patterns, game framework architecture at scale, maintainability over time, robust API design, etc.
• Solid understanding of mobile networking best practices: request limiting, request caching, batching, content aggregation, minification, integrating with rest and TCP/UDP services, etc.
• Experience with asynchronous, multi-threaded, parallel programming paradigms and other techniques to maximize UI responsiveness and do operations in background
• Experience and understanding around client-side testing, like unit, functional or integration testing
• Strong knowledge of game programming fundamentals, common patterns, how systems work together and various common architectural approaches
• Strong mobile experience (iOS and Android): ability to debug native device issues, strong understanding of hardware and platform limitations, performance metrics, etc.
• Good understanding of tooling around game development, like Git, Jenkins for build automation, etc.
• Enjoy solving complex technical problems, especially in large systems

Please ensure that the résumé/CV you attach is written in English.

At Scopely, we create games for everyone - and want to ensure that the people behind our games reflect that! We are committed to creating a diverse, supportive work environment where everyone is treated with respect. We are committed to providing equal employment opportunities and welcome individuals from all backgrounds to join us & embrace the adventure!

About Scopely

Scopely is a leading video game and global interactive entertainment company, home to many of the world’s most beloved and enduring experiences, including two of the most successful mobile games of all-time “MONOPOLY GO!” and “Pokémon GO,” along with “Stumble Guys,” “Star TrekTM Fleet Command,” “MARVEL Strike Force,” “WWE Champions,” the Scrabble franchise, “Yahtzee With Buddies,” and many others. Across mobile, web, PC, and console, Scopely creates, develops, publishes, and live-operates one of the most diversified and award-winning portfolios in the games industry — bringing hundreds of millions of players together through a shared love of play.

Founded in 2011, Scopely is powered by its exceptional team — including thousands of world-class gamemakers around the globe, a distinctive tenet-driven culture, and its proprietary technology platform, Playgami. Together, these strengths have fueled Scopely’s position as the #1 mobile games company in the U.S. and #2 globally, generating more than $10 billion in lifetime revenue. Whether building global sensations like “MONOPOLY GO!” from the ground up, or expanding through strategic acquisitions, including the FoxNext, GSN, and Scopely Explore games businesses — Scopely consistently delivers experiences players love today and return to for years to come.

Recognized multiple times as one of the "100 Most Influential Companies in the World" by TIME magazine and one of Fast Company's "World's Most Innovative Companies" and “Best Workplaces for Innovators,” Scopely believes that video games can be a force for good — creating meaningful connections, vibrant communities, and making life better through play.

Scopely has global operations and partners across four continents in more than a dozen countries worldwide.

For more information, visit: https://www.scopely.com/.

Notice to Candidates: Scopely will never request payment or financial information during the application or hiring process. Please apply only through our official website and verify that all Talent Partner communications come from an email address ending in @scopely.com.

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Employment at Scopely is based solely on a person's merit and qualifications. Scopely does not discriminate against any employee or applicant because of race, creed, color, religion, gender, sexual orientation, gender identity/expression, national origin, disability, age, genetic information, veteran status, marital status, pregnancy or related condition (including breastfeeding), or any other basis protected by law. We also consider qualified applicants with arrest or conviction records, consistent with applicable federal, state and local law.