Senior UI Engineer

📍 Job Overview

Job Title: Senior UI Engineer

Company: Companion Group Ltd

Location: London, United Kingdom

Job Type: FULL_TIME

Category: Game Development / Engineering

Date Posted: 2026-04-29

Experience Level: 5-10 Years

Remote Status: Fully Remote

🚀 Role Summary

• Architect, implement, and refine cutting-edge multiplayer-ready gameplay systems, with a strong emphasis on Unreal Engine and C++ development.

• Produce elegant, efficient, and maintainable C++ code, leveraging modern C++ standards (C++17, C++20) for diverse applications including systems and network programming.

• Utilize expert-level understanding of data structures and algorithms (DSA) to solve complex technical challenges inherent in multiplayer game development.

• Collaborate closely with cross-functional teams (developers, designers, artists) to deliver innovative and scalable networked gameplay experiences.

• Contribute to the development and optimization of robust networking solutions, ensuring seamless player experiences.

📝 Enhancement Note: The provided description focuses heavily on "Game Developer" and "multiplayer game development" with specific Unreal Engine and C++ requirements. While the title is "Senior UI Engineer," the core responsibilities and requirements listed are indicative of a Senior Game Engineer specializing in networking and gameplay systems, not traditional UI/frontend engineering. This enhancement assumes the role is a Senior Game Engineer with a focus on multiplayer systems, aligning with the detailed responsibilities and technical skills provided.

📈 Primary Responsibilities

• Design, develop, and maintain robust multiplayer gameplay systems, both within and outside the Unreal Engine framework.

• Write clean, efficient, and well-documented C++ code, adhering to modern C++ best practices and standards.

• Apply advanced knowledge of data structures and algorithms to optimize game performance and solve complex engineering problems.

• Partner with artists, designers, and other engineers to translate gameplay concepts into functional and engaging features.

• Develop and enhance scalable networking solutions, ensuring stable and responsive multiplayer interactions.

• Proactively identify, diagnose, and resolve intricate technical issues in complex multiplayer game environments.

• Contribute to the continuous improvement of the development pipeline and engineering best practices.

• Mentor junior engineers, providing technical guidance and fostering a collaborative team environment.

📝 Enhancement Note: The original description lists responsibilities that are more aligned with a Senior Game Engineer role focused on core gameplay and networking rather than a typical UI Engineer. This section has been expanded to reflect the depth of responsibilities implied by "architect, implement, and refine cutting-edge multiplayer-ready gameplay systems" and "tackle and resolve intricate technical hurdles."

🎓 Skills & Qualifications

Education: While no specific degree is listed, a Bachelor's degree in Computer Science, Game Development, or a related field is typically expected for senior engineering roles. Equivalent practical experience will also be considered.

Experience: Minimum of 6 years of professional experience in game development, with a significant focus on multiplayer systems and Unreal Engine.

Required Skills:

• Minimum 6 years of hands-on experience with the Unreal Engine.

• Proven experience with C++ programming, including proficiency in modern C++ standards (C++17 and C++20).

• Deep understanding of Client-Server Game Architecture principles (e.g., Client-side prediction, Server reconciliation, Lag compensation, Entity Interpolation).

• Expertise in common data structures and algorithms (DSA) and their practical application in game development.

• Experience with online services and Game Backend as a Service (GBaaS) solutions (e.g., Azure Playfab, AccelByte AGS), or custom game backend integration/development.

• Familiarity with UE’s Gameplay Abilities System (GAS).

• Excellent communication and collaboration skills, crucial for a fully remote, co-development environment.

• Strong problem-solving abilities and meticulous attention to detail.

Preferred Skills:

• Experience with Entity Component Systems (ECS) (e.g., flecs.dev).

• Experience with AI systems, such as Behaviour Trees, State Trees, or Utility AI.

• Familiarity with one or more major Cloud Providers (AWS, Azure, GCP).

• Experience with scripting languages and tools development (e.g., Lua, Python, Javascript).

• Proficiency in another programming language (e.g., Rust, Golang).

• Experience with Host-Migration and Seamless-Server Transitions.

📝 Enhancement Note: The "Requirements Summary" and "What makes you stand out" sections from the original description have been structured into Required and Preferred Skills. The requirement for "6+ years of experience in the Unreal Engine" and "Experience with at least one proprietary game engine (C/C++ OOP/ECS)" has been interpreted as a minimum of 6 years in game development with a strong Unreal Engine focus, as per industry standards for senior roles. The distinction between C++ within Unreal and C++ for broader systems/network programming has been clarified.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• Showcase of complex multiplayer gameplay systems you have architected and implemented, clearly detailing your role and contributions.

• Examples of C++ code demonstrating elegant, efficient, and maintainable solutions, highlighting modern C++ practices.

• Case studies detailing how you applied data structures and algorithms to solve performance bottlenecks or complex engineering challenges in previous projects.

• Demonstrations or detailed explanations of networking solutions you've developed or significantly improved, including concepts like client-side prediction or lag compensation.

Process Documentation:

• Documentation of a complex multiplayer feature you designed and implemented, including design choices, technical challenges, and solutions.

• Examples of code reviews or technical design documents you've authored, demonstrating clear communication of technical concepts and adherence to best practices.

• Process for debugging and resolving intricate networking or gameplay-related issues in a multiplayer context.

• Workflow for collaborating with cross-functional teams to iterate on gameplay features and ensure technical feasibility.

📝 Enhancement Note: Given the senior level and the focus on complex multiplayer systems, a portfolio showcasing practical application of skills is essential. This section infers typical expectations for a Senior Game Engineer, focusing on demonstrable contributions to multiplayer architecture, networking, C++ code quality, and problem-solving through data structures and algorithms.

💵 Compensation & Benefits

Salary Range: Based on industry benchmarks for Senior Game Engineers in London, UK, with 6+ years of experience and expertise in Unreal Engine and multiplayer networking, the estimated annual salary range is £80,000 - £120,000. This range can vary based on the candidate's specific experience, the complexity of projects, and the exact scope of responsibilities.

Benefits:

• Fully remote work environment with flexibility.

• Opportunity to work on AAA co-development projects with major studios worldwide.

• Collaborative and globally distributed team culture emphasizing clear communication.

• Professional development opportunities, including potential for learning new technologies and languages.

• Contribution to groundbreaking multiplayer game titles.

• Competitive salary and potential for performance-based bonuses (details to be confirmed with employer).

Working Hours: Standard full-time hours are expected, likely around 40 hours per week. Given the fully remote nature and global distribution of the team, some flexibility in working hours may be available, but consistent availability for team collaboration and meetings will be required.

📝 Enhancement Note: Salary range is estimated for a Senior Engineer role in London, UK, given the absence of specific salary data. The estimate is based on average salaries for similar roles in the UK tech/gaming sector, adjusting for experience level and specialization. Benefits are inferred from the company description and typical offerings for remote senior engineering positions.

🎯 Team & Company Context

🏢 Company Culture

Industry: Gaming (AAA Co-Development)

Company Size: While specific numbers aren't provided, the description mentions a "globally distributed and fully remote setup" and collaboration with "major studios worldwide," suggesting a medium-sized, agile studio focused on specialized co-development rather than a large internal development house.

Founded: The founding date is not specified, but the company's expertise in "overcoming the most intricate challenges in multiplayer game development" and its established reputation imply a history of successful projects.

Team Structure:

• The team operates as a fully remote, globally distributed entity, emphasizing seamless integration with client in-house teams.

• Collaboration is central, with engineers working closely with designers, artists, and project managers.

• The engineering team likely comprises specialists in various areas like gameplay, networking, engine, and tools.

Methodology:

• Emphasis on clear, continuous, and transparent communication as a core value, vital for remote collaboration.

• Focus on tackling complex technical challenges in multiplayer game development, aiming for scalability, player density, and immersive experiences.

• Agile development methodologies are likely employed, given the co-development model and fast-paced gaming industry.

• Data-driven decision-making for performance optimization and system design.

Company Website: [Companion Group Ltd Careers - Link to be provided, assumed to be companiongroupltd.recruitee.com based on URL structure]

📝 Enhancement Note: Company culture and structure details are inferred from the provided company description, focusing on aspects relevant to a remote, collaborative, and technically challenging environment like AAA game co-development.

📈 Career & Growth Analysis

Operations Career Level: This role is positioned as a Senior Engineer, indicating a mid-to-late career stage. It requires significant technical expertise, problem-solving capabilities, and the ability to operate with a high degree of autonomy. Senior engineers are expected to influence technical direction and mentor others.

Reporting Structure: Senior Engineers typically report to an Engineering Lead or Technical Director. They will work closely with Project Managers and potentially client-side technical leads.

Operations Impact: The impact of this role is directly tied to the success of the multiplayer games developed. By architecting and implementing robust, scalable, and performant multiplayer systems, the Senior UI Engineer (interpreted as Senior Game Engineer) directly influences player experience, game stability, and the overall quality and marketability of the titles.

Growth Opportunities:

• Technical Specialization: Deepen expertise in specific areas like advanced networking, AI, engine architecture, or specific game systems (e.g., GAS).

• Leadership Development: Transition into roles such as Lead Engineer, Technical Director, or Architecture roles, guiding technical strategy and leading teams.

• Cross-Disciplinary Learning: Gain exposure to other areas of game development (e.g., engine programming, tools development, backend services) through collaboration and project scope.

• Industry Exposure: Work on diverse AAA titles and collaborate with various major game studios, expanding professional network and portfolio.

📝 Enhancement Note: The growth analysis is tailored to a senior-level engineering role within the gaming industry, focusing on technical advancement, leadership potential, and the unique opportunities presented by a co-development and remote work model.

🌐 Work Environment

Office Type: This is a fully remote position. There are no physical office locations mentioned for this role, and the company operates as a globally distributed studio.

Office Location(s): The company is globally distributed. While the role is based in London for administrative or payroll purposes, the work is performed remotely from the employee's location within the United Kingdom.

Workspace Context:

• The primary workspace is a remote setting, requiring self-discipline and effective time management.

• Collaboration tools (e.g., Slack, Discord, Jira, Confluence) are essential for communication and project management.

• Access to necessary development hardware and a stable internet connection is required.

• Opportunities for virtual team-building activities and social interaction may be provided to foster a sense of community within the remote team.

Work Schedule: Standard full-time hours (approx. 40 per week) are expected. While the remote setup offers flexibility, candidates must be available for core working hours that align with team collaboration and client needs, especially considering the global distribution. This might involve some overlap with different time zones.

📝 Enhancement Note: The work environment is characterized by its fully remote nature and global distribution. Emphasis is placed on the tools and self-management required for such an environment, as well as the potential for flexibility within defined working hours.

📄 Application & Portfolio Review Process

Interview Process:

• Initial Screening: A brief call with a recruiter or hiring manager to assess basic qualifications, experience, and cultural fit.

• Technical Interview(s): In-depth interviews focusing on C++, Unreal Engine, multiplayer networking concepts, data structures, and algorithms. Expect whiteboard coding challenges or live coding exercises.

• Portfolio Review: A dedicated session where candidates present their work, discussing their contributions to specific projects, technical challenges faced, and solutions implemented.

• System Design / Architectural Discussion: A discussion focused on designing or improving complex systems relevant to multiplayer games, assessing architectural thinking and problem-solving skills.

• Final Interview: May involve meeting with senior leadership or a broader team to confirm fit and discuss role expectations.

Portfolio Review Tips:

• Focus on Multiplayer: Highlight projects that demonstrate your expertise in multiplayer game development, networking, and client-server architecture.

• Code Quality: Be prepared to showcase well-structured, efficient, and maintainable C++ code. Explain your design decisions and adherence to modern C++ standards.

• Problem-Solving: For each project, clearly articulate the technical challenges you encountered, your approach to solving them (especially using DSA), and the quantifiable impact of your solutions.

• Unreal Engine & GAS: Specifically showcase your experience with Unreal Engine features and, if applicable, the Gameplay Abilities System (GAS).

• Remote Collaboration: Mention how you've successfully collaborated with remote teams, including communication strategies and tool usage.

Challenge Preparation:

• DSA Refresh: Brush up on common data structures (arrays, linked lists, trees, hash maps) and algorithms (sorting, searching, graph traversal), focusing on their application in game development.

• Networking Concepts: Review client-server architecture, lag compensation, prediction, reconciliation, and entity interpolation in detail.

• C++ Modern Standards: Be ready to discuss and implement features from C++17 and C++20.

• Unreal Engine Deep Dive: Prepare to discuss core Unreal Engine systems, gameplay frameworks, and best practices for multiplayer development within the engine.

📝 Enhancement Note: This section provides actionable advice for candidates, anticipating the interview process and portfolio review for a senior game engineering role, emphasizing the specific technical requirements and the remote work context.

🛠 Tools & Technology Stack

Primary Tools:

• Game Engine: Unreal Engine (primary focus, C++17/C++20).

• Programming Languages: C++ (essential), potentially C, Lua, Python, Javascript, Rust, Golang.

• Version Control: Git (standard for collaborative development).

• IDEs: Visual Studio, Rider (common for C++ development).

Analytics & Reporting:

CRM & Automation:

• Project Management: Jira, Confluence (standard for tracking tasks, documentation, and workflows).

• Communication: Slack, Discord (essential for real-time team communication in a remote setting).

• Online Services/GBaaS: Azure Playfab, AccelByte AGS, or custom backend solutions.

• Cloud Platforms (Preferred): AWS, Azure, GCP.

📝 Enhancement Note: The technology stack is inferred from the job description's emphasis on Unreal Engine, C++, multiplayer networking, and preferred skills like cloud platforms and scripting languages. This highlights the key tools and technologies a candidate should be proficient with.

👥 Team Culture & Values

Operations Values:

• Excellence in Multiplayer: A commitment to pushing the boundaries of multiplayer game development, focusing on scalability, player density, and immersive experiences.

• Technical Mastery: Valuing deep expertise in C++, Unreal Engine, networking, and algorithms, with a drive for continuous learning and improvement.

• Collaboration & Communication: Prioritizing clear, continuous, and transparent communication as a cornerstone of remote teamwork and co-development.

• Problem-Solving: Embracing complex technical challenges and finding elegant, efficient solutions.

• Client-Centricity: Seamlessly integrating with client teams to deliver on their vision and elevate their titles.

Collaboration Style:

• Remote-First: Communication relies heavily on digital tools and proactive outreach.

• Cross-Functional Integration: Engineers are expected to work closely with designers and artists, fostering a shared understanding of project goals.

• Transparent Feedback: A culture where constructive feedback is shared openly to improve code, systems, and processes.

• Knowledge Sharing: Encouraging the sharing of technical insights and solutions across the globally distributed team.

📝 Enhancement Note: These values and collaboration styles are derived from the company's description of its operations, emphasizing its remote, co-development, and technically challenging nature.

⚡ Challenges & Growth Opportunities

Challenges:

• Complex Multiplayer Systems: Developing and maintaining robust, low-latency multiplayer systems that scale to large player counts.

• Remote Collaboration: Ensuring effective communication and seamless integration within a globally distributed, fully remote team.

• Technical Debt Management: Balancing the need for rapid development with the maintenance of high-quality, maintainable code in a fast-paced environment.

• Client Integration: Working effectively within client-provided frameworks and workflows, potentially differing from standard practices.

• Cutting-Edge Technology: Staying abreast of and implementing the latest advancements in game development technology and multiplayer networking.

Learning & Development Opportunities:

• Advanced Networking & Systems: Opportunities to delve deeper into advanced networking techniques, server architecture, and distributed systems.

• Emerging Technologies: Exposure to new game engines, programming languages (like Rust, Golang), and cloud services.

• Leadership Track: Potential to move into lead engineering roles, overseeing technical direction and mentoring junior staff.

• Project Diversity: Working on a variety of AAA titles for different clients, offering broad experience across genres and development styles.

📝 Enhancement Note: Challenges are framed around the core technical demands of the role and the specifics of remote co-development. Growth opportunities are aligned with typical career progression for senior engineers in the gaming industry.

💡 Interview Preparation

Strategy Questions:

• "Describe a complex multiplayer system you designed and implemented. What were the key challenges, and how did you address them using C++ and networking principles?" (Focus on demonstrating architecture, problem-solving, and technical depth.)

• "How would you approach optimizing a multiplayer game that is experiencing significant lag or desynchronization issues? Walk us through your diagnostic process and potential solutions." (Assess understanding of networking concepts and debugging methodologies.)

Company & Culture Questions:

• "What attracts you to Companion Group's co-development and fully remote model?" (Showcase understanding of the company's unique operational setup and your suitability for it.)

• "How do you maintain effective communication and collaboration with a globally distributed team?" (Prepare examples of your remote work strategies and communication tools.)

Portfolio Presentation Strategy:

• Quantify Impact: For each project presented, clearly state the problem, your solution, and the measurable impact (e.g., performance improvement percentage, reduction in bugs, successful feature implementation).

• Code Walkthrough: Be prepared to walk through snippets of your C++ code, explaining design choices, architectural patterns, and efficiency considerations.

• Technical Storytelling: Frame your portfolio pieces as narratives – the challenge, your approach, the outcome, and what you learned.

• Focus on Core Requirements: Ensure your presentation prominently features your experience with Unreal Engine, C++, multiplayer networking, and problem-solving through DSA.

📝 Enhancement Note: Interview preparation advice is tailored to the specific technical requirements (Unreal, C++, networking, DSA) and the company's operational model (remote, co-development), providing concrete examples of questions and preparation strategies.

📌 Application Steps

To apply for this Senior UI Engineer (interpreted as Senior Game Engineer) position:

• Submit your application through the provided link on the Companion Group Ltd careers portal.

• Tailor your Resume/CV: Highlight your 6+ years of experience in game development, specifically focusing on Unreal Engine, C++, and multiplayer networking. Quantify achievements and use keywords from the job description.

• Prepare your Portfolio: Curate projects that clearly demonstrate your expertise in architecting and implementing complex multiplayer gameplay systems and networking solutions. Be ready to present and discuss your contributions in detail.

• Practice Technical Questions: Rehearse answers to common C++, Unreal Engine, and multiplayer networking interview questions. Be prepared for live coding or system design challenges.

• Research Companion Group Ltd: Understand their co-development model, their focus on AAA multiplayer games, and their fully remote operational structure. Prepare questions to ask about the team, projects, and company culture.

⚠️ Important Notice: This enhanced job description includes AI-generated insights and operations industry-standard assumptions. All details should be verified directly with the hiring organization before making application decisions.