Staff Game Engineer (Unity Performance) - Twilight Towers

Fortis Games; Manchester; On-site; GBP 60,000 - 80,000; Full time

Job summary

A leading game development studio in Manchester is looking for a Staff Game Engineer to join their team. The role involves optimizing Unity performance on mobile platforms, architecting scalable systems, and mentoring engineers in best practices. The ideal candidate should have significant hands-on experience with Unity game clients and a strong understanding of mobile optimization. This position is pivotal in shaping how the studio builds its games and fosters a thriving community.

Benefits

Diversity and inclusivity initiatives

Opportunities for professional growth

Collaborative team environment

Qualifications

• Experience shipping or maintaining mobile or cross-platform Unity titles.
• Proven ability to debug complex, cross-system issues.
• Track record of mentoring engineers.

Responsibilities

• Optimize Unity runtime performance across mobile platforms.
• Architect scalable, data-oriented systems for gameplay.
• Mentor engineers in Unity performance patterns.

Skills

Deep hands-on experience in building and optimizing Unity (C#) game clients

Expertise in mobile performance optimization

Advanced proficiency in data-oriented design (ECS, DOTS)

Strong understanding of Unity rendering pipelines

Excellent communication skills

Job description

Who We Are

At Fortis Games we aspire to make great games that bring people together while redefining how game companies work. We believe in building a sense of belonging through our games, their communities, and how we operate and treat each other. Through our game communities, we will create powerful connections and lasting memories. We will foster a culture of diversity, equity and belonging where together our diverse skills, experiences and backgrounds impact the games we make.

About The Role

Fortis is building games where players truly belong - and our first title, Twilight Towers, just hit soft launch. We’re looking for a Staff Game Engineer to help take it global. You’ll be the technical heartbeat of the Unity client - dive deep into Unity, architect clean and scalable systems, and obsess over performance. It’s a hands‑on, high‑impact role where you’ll blend craft, architecture, and optimization, to help shape how we build at Fortis.

What You’ll Achieve

• Profile and optimize Unity runtime performance across gameplay, rendering, and asset systems on mobile platforms
• Architect scalable, data‑oriented systems for ECS, animation, physics, and UI frameworks
• Lead investigations into CPU, GPU, and memory bottlenecks, defining baselines and measurable performance targets
• Build and evolve profiling tools, telemetry systems, and diagnostic frameworks for mobile optimization
• Refactor complex gameplay code for clarity, modularity, and performance
• Mentor engineers in Unity performance patterns, Burst / Job System usage, and mobile optimization practices
• Collaborate with design, art, and backend teams to deliver new features that meet both creative and performance goals
• Contribute to the long‑term Unity architecture and client scalability strategy across titles

What You’ll Need

• Deep hands‑on experience building and optimizing Unity (C#) game clients at scale
• Expertise in mobile performance optimization, including CPU / GPU profiling, memory management, and asset streaming
• Advanced proficiency in data‑oriented design (ECS, DOTS) and multithreaded programming
• Strong understanding of Unity rendering pipelines, Burst Compiler, and Job System
• Proven ability to debug complex, cross‑system issues in live mobile environments
• Experience shipping or maintaining mobile or cross‑platform Unity titles
• Track record of mentoring engineers and improving development efficiency
• Excellent communication skills and ability to influence cross‑discipline technical decisions

Learn more about Twilight Towers and our approach to creating connected, player‑driven worlds at Fortis Games.

Why join us

There are many reasons to join us, but here are a few:

• We strongly believe we are changing how games studios operate and at the core of what we do is making great games that create a connected community
• We're not just about making Games Where You Belong. We're also about building communities where our people belong. That's why Fortis is a thriving environment that celebrates diversity, embraces inclusivity, and fosters growth.
• Build and grow with a seasoned team of accomplished talent who have left an impactful mark in their disciplines, both in and out of gaming

Fortis is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, gender expression, national origin, protected veteran status, or any other basis protected by applicable law, and will not be discriminated against on the basis of disability.