Lead Unity / .NET Developer

About Realityjam

Realityjam (Virtual Reality Jam Ltd) is a UK-based game development studio and multiplayer game development platform. We build ambitious online worlds, power developer education through the Scion Foundation Training Program, and partner with industry leaders, including Unity Software Inc and Edgegap.

Our flagship title, 5th Dimension, is a large-scale MMO currently in active development. The game blends deep progression systems, immersive worldbuilding, and cutting-edge multiplayer infrastructure — and we are now looking for a senior developer to lead its technical delivery.

The Role

As Lead Unity / .NET Developer, you will own the technical direction of 5th Dimension from the inside out. Working closely with the Technical Director, you will architect and implement core game systems, set engineering standards for the team, and drive the project from demo to live service.

This is a hands-on leadership role — you will be writing production code every day while also mentoring junior developers and shaping a codebase that needs to scale to thousands of concurrent players.

Key Responsibilities 

Game Development & Architecture

• Architect and implement core MMO systems: player state, world persistence, inventory, combat, quest logic, and live-service features.
• Design scalable, maintainable Unity code following SOLID principles, with performance and multiplayer concurrency in mind.
• Define and enforce engineering standards, code review practices, and technical documentation across the project.
• Own the game client build pipeline, version control strategy, and CI/CD integration.

Multiplayer & Backend

• Integrate and extend server-side .NET services powering real-time multiplayer gameplay with support from Realityjam’s Senior Full Stack dev.

Leadership & Collaboration

• Lead technical planning sessions; translate game design requirements into engineering tasks.
• Support junior and mid-level developers within the studio and the Scion Foundation Training Program.
• Collaborate with the Technical Director on roadmap, technical risk, and resourcing decisions.
• Communicate clearly with creative and production stakeholders, balancing vision with technical feasibility.

Required Skills & Experience

• Strong, demonstrable experience with Unity (C#) — shipped titles or substantial in-development projects.
• Solid .NET / C# backend experience, ideally with ASP.NET Core, REST APIs, or game service architecture.
• Experience working on multiplayer or online games — networking, state synchronisation, lag compensation.
• Proficiency with version control (Git) and agile/iterative development workflows.
• Ability to lead technical work independently, make architectural decisions, and communicate trade-offs clearly.
• Comfortable in a remote-first, async-friendly environment with a high degree of autonomy.

Desirable Skills & Experience

• Experience with MMO or large-scale persistent online game development.
• Familiarity with game server hosting and orchestration platforms (e.g. Edgegap, Multiplay, Agones).
• Knowledge of Unity DOTS, ECS, or Jobs system for performance-critical gameplay code.
• Experience with cloud platforms (AWS, Azure, GCP) and containerised microservices.
• Exposure to game analytics, telemetry, or live-ops tooling.
• Interest in game development education or mentoring environments.

What We Offer

• Fully remote role with flexible working hours — structure your day around how you work best.
• Start at 4 days per week, transitioning to full-time (5 days) within 3 months as the project and team grow.
• Competitive, negotiable salary — we want to pay fairly for the right person.
• The opportunity to lead development on a genuinely ambitious, original MMO from an early stage.
• A collaborative studio culture that values craft, autonomy, and developer growth.
• Connection to the Realityjam multiplayer development platform and its growing partner ecosystem.

Find out more about the game at

www.5thdimension.gg  and about the studio at www.realityjam.io