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Xanadu

System Software Developer - Performance

Toronto, ON, Canada

Pay: The base salary range is 120,000 - 160,000 CAD.
Job type: Full-time
Apply by: Oct 29, 2026
Posting language: English
Posted: Sep 29, 2026

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Original job description

About Xanadu:

Xanadu’s mission is to build quantum computers that are useful and available to people everywhere.

At Xanadu, we are learners, innovators, researchers, collaborators and problem solvers. We are creating something that has never been built before. Few people in their life will be able to be a part of something like this, where if we are successful, the technologies we develop will solve some of the world’s most challenging problems, and literally change the world. And that is something to be excited about!

Your role and responsibilities:

Building a high-performance software stack that makes optimal use of quantum hardware resources is key to realizing early, game-changing applications of quantum computing. As part of the PennyLane Performance Team, you author high-performance libraries that enable ultra-low latency communication between FPGAs and GPUs, develop other high-performance extensions such as the PennyLane-Lightning simulator suite, and contribute to the performance monitoring and benchmarking tooling for the PennyLane & Catalyst quantum software stack, ensuring PennyLane is the highest-performing framework for quantum computing.

You will:

Develop primitives/libraries that enable ultra-low latency communication between devices in a distributed, heterogeneous system (CPU/GPU/FPGA)
Develop high-performance software components, adapting to new hardware platforms and programming paradigms.
Convert abstract descriptions of algorithms into efficient & understandable software implementations.
Develop the framework for benchmarking the compilation and execution pipeline, tracking quantum resources through the stack, and profiling the quantum software.
Interpret and communicate complex concepts to the wider team.
Participate in software system specification, design, and quality assurance (e.g., requirements gathering, defining software architecture, documentation, verification & validation, etc.)
Provide leadership in software best practices, including continuous-integration pipelines, unit testing, & code review.

Basic Qualifications and Experience:

BSc in Computer Science, Engineering, Physics, Math, or a related field.
Demonstrated experience in low-level networking/systems programming (e.g. networking/low-latency communication (RDMA), concurrency and authoring of high-performance libraries, OS internals)
Proficiency in high-performance Modern C++ (C++17/20 preferred) and Python.
Deep understanding of computer architecture (CPU, GPU, memory hierarchy) coupled with hands-on experience in optimizing code for runtime and memory efficiency using professional profiling tools (e.g. perf, scalene, valgrind).
Proven ability to rapidly diagnose and resolve complex issues across compiled and interpreted environments using industry-standard debuggers.

Preferred Knowledge and Experience:

MSc, PhD in Computer Science, Engineering, Physics, Math, or a related field.
Familiarity with code parallelization and accelerators: multithreading (e.g., OpenMP, C++ threads), multiprocessing (e.g., MPI), GPUs (e.g. CUDA, HIP/ROCm) or compiler offload directives.
Experience in designing and implementing scalable & reproducible scientific workloads on HPC / supercomputer platforms or cloud hardware (e.g., AWS, Azure, GCP).
Expertise in quantum computing, as demonstrated by extensive coursework, thesis, or peer-reviewed publications.
Experience with writing complex quantum workflows and optimizing the use of quantum resources.

Values

Our values are important. They are fundamental and lay the foundation for culture at Xanadu. Learn more about our values here.

This is for a new position. Your base salary will be determined based on your location, experience, and internal benchmarks. The base salary range is 120,000 - 160,000 CAD. You will also be eligible for equity and benefits.

Our values are important. They are fundamental and lay the foundation for culture at Xanadu. Learn more about our values here.

We are an equal opportunity employer and encourage candidates of all backgrounds to apply. We are committed to building an inclusive, safe, and equitable culture and fostering an environment where our employees feel included, valued, and heard. We are committed to meeting the needs of all individuals and support a barrier-free workplace. Should you require accommodations at any point during the recruitment process please contact Recruiting at recruiting@xanadu.ai.

Please be advised that we may use artificial intelligence (AI) tools to assist in the screening and assessment of applicants for this position. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.

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More about this job

Responsibilities

Develop high-performance software libraries and components for low-latency communication across CPUs, GPUs, and FPGAs, and contribute to PennyLane’s simulator suite. Build benchmarking, profiling, and resource-tracking tools, while helping design software systems and uphold quality practices such as testing, code review, and continuous integration.

Requirements

A bachelor’s degree in computer science, engineering, physics, mathematics, or a related field is required, along with demonstrated low-level systems or networking experience and proficiency in modern C++ and Python. Candidates should have strong computer architecture knowledge, experience optimizing and profiling code, and the ability to diagnose complex issues; graduate education and experience with parallel computing, HPC, or quantum computing are preferred.

Skills

Modern C++
Python
Low-Level Systems Programming
Low-Latency Networking
High-Performance Libraries
Concurrency
Computer Architecture
Performance Optimization
Profiling
Debugging
GPU Programming
FPGA Communication
Benchmarking
Parallelization
Quantum Computing
Continuous Integration

Benefits

Equity
Benefits

Visa sponsorship

Not detected in the job text

Keywords

C++17
C++20
Python
PennyLane
PennyLane-Lightning
Catalyst
Quantum Computing
Quantum Software
CPU
GPU
FPGA
RDMA
Low-Latency Communication
Concurrency
Computer Architecture
Memory Hierarchy
Performance Optimization
Perf
Scalene
Valgrind
OpenMP
MPI
CUDA
HIP/ROCm
HPC
Benchmarking
Profiling
Continuous Integration
Unit Testing
Code Review

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