> Markdown version of [/jobs/ext/3555296-senior-core-engineer](https://www.wearedevelopers.com/jobs/ext/3555296-senior-core-engineer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# Senior Core Engineer

- **Company:** Unity Technologies
- **Location:** Seattle, WA, United States
- **Experience:** Expert
- **Salary:** $115,400.0 - $173,000.0
- **Contract:** Permanent contract
- **Skills:** Training Data, Computer Animation, Application Programming Interfaces (APIs), Artificial Intelligence, C Sharp (Programming Language), C++ (Programming Language), Encodings, Serialization, Software Debugging, Distributed Systems, Middleware, Game Engine, Machine Learning, Network Protocols, Data Streaming, Delivery Pipeline, Change Tracking
- **Published:** October 2, 2026
- **Apply:** https://www.careerjet.com/job/usd79b7a3769914d6a9414d1b39a8ac064/eaa

## About the Role

* Core Engine Expertise: Experience building or fundamentally extending game engine cores, middleware, or foundational systems (e.g., serialization, build pipelines, memory subsystems).
 * Architectural Vision + Practical Implementation: Design modular, testable systems, then implement and debug them yourself end-to-end
 * High-Performance Coding: Strong C++ and C# skills, with practical understanding of CPU caches, branch behavior, memory layout, and profiling.
 * Engine-Wide Breadth: Hands-on experience across multiple engine domains (e.g., physics, animation, input, assets) and how they interact.

You might also have:

 * Familiarity with compression, streaming, replication, authority models, RPCs, state diffing, delta encoding, or network protocols for real-time interactive systems.
 * Experience with determinism, replay systems and simulation consistency.
 * Deep knowledge of multithreading, job systems, lock-free techniques, and/or Unity DOTS.
 * Experience with MCP-style tool interfaces, training data generation, machine learning, or agentic workflows.

## Description

PolySpatial is the core technology behind Unity's support for visionOS, streaming Unity games into Fortnite, and iteration tools like Play to Device, Scene Recording, and AI data capture and analysis. Underneath all of it is a single model for connecting devices, users, applications, and even different game engines, and we're constantly finding new places to put it to work.
We're looking for engineers eager to help us invent how different real-time 3D runtimes communicate and render under real-world constraints. You'll work at the intersection of core engine tech, high-performance networking, distributed systems, and graphics. This is your opportunity to build the fundamental infrastructure for the next generation of interconnected game and 3D ecosystems.
You'll own critical tech that enables Unity to run as a guest within other processes, engines, and distributed systems. This is deep engine work requiring a holistic understanding of execution models, serialization, asset lifecycles, and runtime performance-all operating reliably in host environments we don't control. You'll design systems that allow Unity to load, run, and synchronize assets when we don't own the main loop, design clean, extensible architecture, then drop into assembly to shave off milliseconds.
What you'll be doing:

 * Own and evolve critical subsystems across the engine stack, from low-level C++ to high-level C# APIs across editor, build, and runtime code.
 * Design and implement high-performance, extensible APIs intended for embedded, cross-process, and networked configurations.
 * Develop schemes to manage execution timing and resource contention within or between processes and over the network with minimal overhead
 * Orchestrate loading, change tracking, serializing, and synchronizing components and assets in bandwidth and latency-constrained environments., This position requires the incumbent to have a sufficient knowledge of English to have professional verbal and written exchanges in this language since the performance of the duties related to this position requires frequent and regular communication with colleagues and partners located worldwide and whose common language is English.
Headhunters and recruitment agencies may not submit resumes/CVs through this Web site or directly to managers. Unity does not accept unsolicited headhunter and agency resumes. Unity will not pay fees to any third-party agency or company that does not have a signed agreement with Unity.
Your privacy is important to us. Please take a moment to review our and Privacy Policies. Should you have any concerns about your privacy, please contact us at DPO@unity.com.


## Related Videos

- [Coding an Immersive Copilot using Unity / .NET and Azure OpenAI!](https://www.wearedevelopers.com/videos/1204-coding-an-immersive-copilot-using-unity-net-and-azure-openai)
- [A Brief History of Data Storage](https://www.wearedevelopers.com/videos/974-a-brief-history-of-data-storage)
- [Building a fully automated escape room](https://www.wearedevelopers.com/videos/735-building-a-fully-automated-escape-room)
- [Developer’s Perspective: Overview of the Tezos Blockchain Ecosystem](https://www.wearedevelopers.com/videos/237-developer-s-perspective-overview-of-the-tezos-blockchain-ecosystem)
- [WeAreDevelopers LIVE - "Fun and games - and all that comes with it", Back to BASIC & more](https://www.wearedevelopers.com/videos/1719-wearedevelopers-live-fun-and-games-and-all-that-comes-with-it-back-to-basic-more)
- [The Impact of AI on Game Development and the Industry](https://www.wearedevelopers.com/videos/100297-the-impact-of-ai-on-game-development-and-the-industry)

## Related Articles

- [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers)
- [9 Claude Code Skills to Speed Up Your Workflow](https://www.wearedevelopers.com/magazine/740-9-claude-code-skills-to-speed-up-your-workflow)
- [Why Upskilling And Reskilling is Important For Developers](https://www.wearedevelopers.com/magazine/428-why-upskilling-and-reskilling-is-important-for-developers)
- [What Jobs Can You Get with a Software Engineering Degree?](https://www.wearedevelopers.com/magazine/398-what-jobs-can-you-get-with-a-software-engineering-degree)
- [Dev Digest 129 - Now that's what I call private data!](https://www.wearedevelopers.com/magazine/468-dev-digest-129-now-that-s-what-i-call-private-data)
- [Navigating the AI Shift](https://www.wearedevelopers.com/magazine/629-navigating-the-ai-shift)