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Principal Software Engineer - League of Legends , UI Tooling

Riot Games

Los Angeles, CA · Posted September 22, 2026

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  • Python
  • C#

About the job

Riot engineers bring deep knowledge of specific technical areas but also value the opportunity to work in many broader domains. As a Software Engineer, you'll work with both new and current technology, creating creative solutions to overcome high-volume obstacles and to bring player value.

As a Principal Software Engineer on the UI Tooling team , you will develop against the foundations of the UI frameworks and authoring tools used to build experiences for League of Legends. The scope of this position requires collaboration with technology owners and content teams across the organization to ensure we provide thoughtful tools and workflows that help engineers, designers, and artists create and iterate effectively. For this role, you’ll report to the organization’s Engineering Manager. You will also partner with other teams and disciplines to ensure that your work improves the quality of life and effectiveness of those partners. Our platform is written in C++ and makes heavy use of the Qt ecosystem for UI/UX, with Python supporting several utility and workflow needs. This role will be based out of our Los Angeles Headquarters.

Responsibilities :

Work and align with different partners that span across multiple teams to ensure we're delivering awesome features to excite them

Contributing to technical discussions/designs that your team oversees

Own the software lifecycle for your code that includes develop/test/deploy/maintaining frameworks, platforms, and tools

Mentorship. You help junior Rioters develop the tools and creative atmosphere to shine

Participate in the team's support rotation

Required Qualifications:

8+ years of deep hands-on experience with C/C++ that spans several use-cases and platforms.

At least 5 years of experience in the video game industry that includes working within multiple game development UI and an example of a shipped game.

Have been responsible for driving the development of several organizational sized development efforts (1-year+ scope), including requirements gathering, planning, and testing.

Maintained software development best practices within your organization that includes design/code reviews, coding standards, source control management, testing, delivery performance, scalability, and maintainability

Experience working on a custom, internally developed game engine and tooling.

Expertise with UX artist workflows

For this role, you'll find success through craft expertise, a collaborative spirit, and decision-making that prioritizes the delight of players. We will be looking at your past studies, experience, and your personal relationship with games. If you embody player empathy and care about the experiences of players, this could be the role for you!

Our Perks:

Riot focuses on work/life balance, shown by our open paid time off policy and other perks such as flexible work schedules. We offer medical, dental, and life insurance, parental leave for you, your spouse/domestic partner, and children, and a 401k with company match. Check out our benefits pages for more information.

At Riot Games, we put players first . That mission drives every decision in our quest to create games and experiences that make it better to be a player. Whether you’re working directly on a new player-facing experience or you’re supporting the company as a whole, everyone at Riot is part of our mission. And just like in our games, we’re better when we work together. Our goal is to create collaborative teams where you are empowered to bring your unique perspective everyday. If that sounds like the kind of place you want to work, we’re looking forward to your application.

It’s our policy to provide equal employment opportunity for all applicants and members of Riot Games, Inc. Riot Games makes reasonable accommodations for handicapped and disabled Rioters and does not unlawfully discriminate on the basis of race, color, religion, sex, sexual orientation, gender identity or expression, national origin, age, handicap, veteran status, marital status, criminal history, or any other category protected by applicable federal and state law. We consider for employment all qualified applicants, including those with criminal histories, in a manner consistent with applicable federal, state and local law, including the California Fair Chance Act, the City of Los Angeles Fair Chance Initiative for Hiring Ordinance, the Los Angeles County Fair Chance Ordinance for Employers, the San Francisco Fair Chance Ordinance, and the Washington Fair Chance Act.

Per the Los Angeles County Fair Chance Ordinance, the following core duties may create a basis for disqualifying candidates with relevant criminal histories:

Safeguarding confidential and sensitive Company data

Communication with others, including Rioters and third parties such as vendors, and/or players, including minors

Accessing Company assets, secure digital systems, and networks

Ensuring a safe interactive environment for players and other Rioters

These duties are directly related to essential operations, safety, trust, and compliance obligations within our organization. Please note that job duties may evolve based on business needs and additional responsibilities may be assigned as necessary to maintain operational efficiency and security.