Principal Software Engineer, Native

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* Location:

** Philadelphia, PA - Hybrid (3 days in a week - in office)
No sponsorship is available for this role
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* Position Summary:

** Cesium, as part of Bentley Systems, is setting the standard for 3D geospatial technology across diverse industries, from construction and engineering to defense and aerospace. With a thriving open-source community and millions of downloads, we are at the forefront of innovation.

We are seeking a visionary Principal Engineer to join our Cesium Native squad. This role is pivotal in advancing our core C++ libraries that power 3D geospatial applications and experiences within the world's leading game engines. You will be a leading voice in the technical direction of our open-source, cross-platform technology that enables developers to stream and visualize massive real-world 3D datasets.
** Responsibilities:
*** Architect, develop and shape the future of the core Cesium Native C++ libraries, focusing on performance, modularity, and clean API design to support our integrations with Unreal Engine, Unity, and NVIDIA Omniverse.
* Drive the research and implementation of novel 3D graphics algorithms, tackling the most challenging problems in large-scale geospatial visualization.
* Enhance our runtimes capabilities for high-performance streaming, level-of-detail selection, and efficient decoding of massive geospatial datasets.
* Profile and debug the engine to identify and eliminate performance bottlenecks, ensuring a smooth experience for end-users on a variety of platforms.
* Set the standard for engineering excellence within the team and the open-source community through exemplary code, insightful reviews, and strategic technical guidance.
* Mentor and grow other senior engineers on the team, fostering a culture of technical innovation and continuous improvement.
* Partner with product management and engineering leadership to define and execute the multi-year technical roadmap for the Cesium Native ecosystem.
* Requires sitting or standing at will while performing work on a computer (or any other ).
* No travel is required for this role.
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* Qualifications:

*** Over 12 years of professional experience in 3D runtime or game engine development.
* Expert-level C++ development skills (C++17/20/23), with a strong focus on API design, modular architecture, and high performance.
* Recognized expertise in modern graphics APIs (Vulkan, DirectX 12, Metal) and advanced 3D graphics algorithms.
* Proven experience leading the technical design and implementation of core engine components for platforms like Unreal Engine, Unity, or NVIDIA Omniverse.
* Solid understanding of graphics algorithms, spatial data structures, and 3D mathematics.
* Experience debugging, profiling, and optimizing complex, multi-threaded graphics applications.
* Familiarity with geospatial concepts and data formats such as photogrammetry, point clouds, terrain, and open standards like glTF and 3D Tiles.
* Excellent written and verbal communication skills, with experience collaborating with both internal teams and external communities.
* Demonstrated ability to influence and lead cross-functional teams and effectively mentor other senior engineers.
* BS or MS in Computer Science, Software Engineering, or a related field, or equivalent industry experience.#LI-RB1#LI-HYBRID This is a Hybrid role.
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* What We Offer:

*** Step into a collaborative work environment where ideas flourish, and teamwork propels us forward towards shared success.
* An attractive salary and benefits package.
* Bentley Impact Day: take a day off from work to volunteer with an organization of your choice.
* Celebrate milestone achievements and moments that matter through our colleague recognition award programs and our Bentley Achievers platform.
* A…