Senior Software Engineer (Unity/C#)

TL;DR

Senior Software Engineer (Unity/C#): Lead the technical design and implementation of cross-platform mobile gameplay systems for a large active user base with an accent on performance, reliability, and scalable Unity-based development. Focus on driving reusable, maintainable code across iOS/Android, solving complex mobile issues through profiling and debugging, and providing technical leadership through reviews and mentorship.

Location: JP - Tokyo, Japan

Company

hirify.global is a global interactive entertainment company that develops and live-operates popular mobile and other gaming experiences.

What you will do

• Lead technical design and implementation of engaging, scalable gameplay systems for a large and active user base.
• Own cross-platform development across mobile (iOS/Android), ensuring code is reusable, maintainable, and performant across environments.
• Drive performance optimization and reliability via profiling, debugging, and troubleshooting complex mobile issues.
• Collaborate with engineers, product managers, game designers, and UX designers to deliver high-quality user experiences.
• Provide technical leadership and mentorship through code reviews, design reviews, and knowledge sharing.
• Improve development processes, testing practices, and overall code quality.

Requirements

• 5+ years of professional game development experience with strong expertise in Unity and/or other game engines.
• Proficiency in C# or C++.
• Ability to work in a fast-paced hybrid environment and handle stress while solving practical problems with limited advance notice.
• Experience working on cross-functional teams with effective written and verbal communication, including synchronous interactions.
• Japanese: intermediate–Business level
• In-office requirement: 3 days per week (Tuesday, Wednesday, Thursday)

Nice to have

• Mobile or console game performance optimization experience.
• Shader programming experience (e.g., GLSL, HLSL, Metal).
• Experience building products that connect people through shared real-world or interactive experiences.

Culture & Benefits

• Hybrid work with a defined in-office schedule (Tue/Wed/Thu).
• Cross-functional, multi-disciplinary team environment spanning engineering, product, design, and UX.
• Emphasis on engineering excellence through improved testing practices and code quality.
• Use of generative AI to support tooling, testing, debugging, prototyping, and product quality.

Hiring process

• Interviews focused on technical design, implementation approach, and collaboration experience.
• Evaluation of practical problem-solving and communication through synchronous discussions.
• Technical review/assessment of Unity/C# (or C++) expertise and engineering practices.