Senior Software Engineer – Client
Here’s a refined and polished job description based on the Built In posting:

Senior Software Engineer – Client (Unreal Engine MMO)
Company: Manticore Games Inc. (Core platform)
Location: San Mateo, CA (HQ) • Fully Remote (U.S.)
Experience Level: Senior
Salary Range: $115K – $185K base + equity + benefits (builtin.com)
Industry: Gaming – Combat-focused, action-packed MMO
🛠️ Role Overview
We’re seeking a seasoned Senior Software Engineer to design and build gameplay mechanics, UI, and client systems for our next-gen MMO, powered by Unreal Engine. This is a high-impact position where you’ll own large-scale client-side development and collaborate across art, design, production, server engineering, and QA teams. Success in this role is about delivering polished, performant, and secure gameplay experiences on PC and console platforms.
Key Responsibilities
- Architect, code, and optimize gameplay features, UI, and systems using Unreal Engine & C++
- Implement and maintain networked gameplay on both client and server sides
- Partner with interdisciplinary teams (Design, Art, QA, Production) to iterate on game systems and polish user experience
- Integrate client systems with backend services and pipelines
- Develop internal tools to support user-generated content, asset pipelines, and high-performance client workflows (builtin.com)
Required Qualifications
- 5+ years in game development (PC/console), with substantial published experience
- 3+ years of C++ programming experience
- 2+ years using Unreal Engine
- Proven ability to collaborate across disciplines and navigate complex production environments
- Strong aptitude for problem-solving, system design, and expert software engineering methodologies
- BS in Computer Science (or related) or equivalent industry experience (builtin.com)
Nice-to-Have
- Experience building online/MMO game components
- Familiarity with client-side security, anti-cheat mechanisms, or game auditing
- Skills in graphics debugging, profiling, and optimization (preferably in Unreal)
- Technical knowledge of client/server architectures, network reliability, and security systems
- Background in real-time physics simulation (e.g., Chaos, PhysX) (builtin.com)
Perks & Benefits
- Competitive medical, dental, and vision coverage
- 401(k) plan with employer match
- Paid parental leave
- Flexible PTO & remote work options
- FSAs & commuter benefits
- Daily in-office lunches, snacks, and drinks (for local staff)
- Employee discounts via ADP (builtin.com)
About Manticore Games & Core
Founded in 2016 and headquartered in San Mateo, CA, Manticore Games powers Core—a game creation platform enabling users worldwide to build and share immersive game experiences. Supported by Epic Games, SoftBank, Benchmark Capital, and others, we’re redefining how games are made and played (builtin.com).
How to Apply
Visit Manticore Games Careers and find the “Senior Software Engineer – Client” listing.
Be sure to highlight your Unreal Engine projects, networked gameplay experience, and any MMO or client optimization work.
Let me know if you’d like help tailoring resume bullet points or crafting interview strategies for this role!