Staff Software Engineer (Platform) in London

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.

We are an early but mighty organization with a leadership team of game industry veterans. There are many opportunities for you to have a big impact on the products we’ll be making as well as the overall direction of the company. If you’re passionate about tackling difficult problems with direct and thoughtful communication and a team-first mentality, we may be the right place for you.

As a Staff Unity Client Engineer, you will own platform live ops features and apply your creativity throughout the entire development lifecycle - from initial design to live game support. You will collaborate closely with product, design, and engineering teams to deliver high-quality game client features and reusable components, helping to accelerate development across Fortis Games. In this role, you will also provide technical leadership, architectural guidance, and mentorship to other engineers.

What you’ll achieve:

• Engage in full-lifecycle development: scoping, design, implementation, documentation, and deployment of our game application.
• Lead technical design and design principles for client features and shared components.
• Collaborate with back-end engineers on server-dependent game features.
• Work with product managers to shape product scope, evaluate technical tradeoffs, and define scalable solutions.
• Adhere to and elevate studio development guidelines, code style, testing strategy, and architecture standards.
• Perform in-depth client code analysis to identify and resolve complex bugs and performance issues.
• Create and review technical design documents to guide stakeholders and engineers.
• Mentor and support other engineers, including guidance on TDD practices and effective use of AI coding agents in daily workflows.

What you’ll need to be successful:

• Experience developing mobile games or client applications using Unity3D.
• Familiarity with building SDKs and reusable client frameworks.
• Proven software engineering expertise within the gaming industry.
• Experience leading architecture and technical design decisions.
• Strong knowledge of software design principles and test-driven development (TDD) practices.
• Experience collaborating with product managers on feature scope and technical planning.
• Practical experience using AI coding agents / AI-assisted development tools with appropriate validation and quality control.
• Team player, able to collaborate effectively with engineers, designers, and developers, with strong communication skills.

Why join us:

• 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.