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Added 8 days ago
Senior Construction Inspector - Water
Stantec
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Full-time
Our Burnaby office has an opportunity for a Site Superintendent, Engineer or Engineering Technologist. This position would be for full-time resident field inspections.
Added 8 days ago
Process Performance and Operational Readiness - Senior Eng.
Systemex Industries Conseils
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Full-time
Join Systemex as a Senior Engineer – Process Performance & Operational Readiness, acting as a technical advisor to mining and mineral processing clients. You will support operations from…
Added 8 days ago
Process Performance and Operational Readiness - Intermediate Engineer
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Added 8 days ago
Lead Platform Engineer (DevOps & MLOps)
Shore Consulting
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Reporting to the Director, Platform Services, the Lead DevOps Engineer is a senior, hands-on technical leader responsible for building, operating, and continuously improving Afflo’s…
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Geotechnical Field Technician
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H.H. Angus & Associates Ltd.
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Senior Backend Engineer, Client Portal
EvenUp
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$152,660 to $214,475 USD / year
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Senior Structural Engineer 2 - Nuclear
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This is a senior engineering position that offers a variety of interesting and challenging opportunities in structural engineering and will provide an excellent opportunity to advance your…
Added 8 days ago
Principal Engineer - Water
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Ottawa, ON
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We are seeking a Principal Engineer - Water, to join our Water Sector in Ottawa, ON. In this role, you will be responsible for business development, technical leadership and project…
Added 8 days ago
Senior Naval Architect
allswater
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Support proposal development, project planning and client relationship management.
Added 8 days ago
Senior Data Platform Engineer
Norton Rose Fulbright
Toronto, ON
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The Senior Data Platform Engineer will act as a technical lead for our technologies in any project or initiative, and is responsible for designing, developing, implementing, and supporting…
Added 8 days ago
Senior Data Platform Engineer
Norton Rose Fulbright
Calgary, AB
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The Senior Data Platform Engineer will act as a technical lead for our technologies in any project or initiative, and is responsible for designing, developing, implementing, and supporting…
Added 8 days ago
Senior Project Engineer, Transportation
R.V. Anderson Associates Limited
London, ON · Toronto, ON · Burlington, ON · St. Catharines, ON
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RVA is seeking a Senior Engineer to join their Transportation team.
Added 9 days ago
Sr. Aseptic Filling Project Engineer
Pillar 5 Pharma inc.
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Pillar5 Pharma is seeking an experienced Senior Project Engineer / Senior Aseptic Filling Engineer to lead the implementation of new aseptic manufacturing and packaging capabilities within…
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Project Engineer
The Magnum Ice Cream Company
Minto, ON
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The Project Engineer is responsible for the safe, compliant, and efficient delivery of multiple capital, infrastructure, process, packaging, utilities and safety projects across the Minto…
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Senior Water Scientist / Engineer
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Senior Software Engineer
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Proven experience in backend development, with a track record of delivering high-quality and performant projects
Added 9 days ago
Senior Software Engineer
Great Value Hiring
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Contribute expert-level code samples, debugging strategies, and development insights in Python3, Java, Rust, Go, C++, or TypeScript
Added 9 days ago
Mining Potash Lead
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…facilities and solve complex challenges. Our work spans the full project life cycle, from up-front evaluation and planning studies through design and into construction monitoring and…
Added 9 days ago
Intermediate Municipal Engineer
Stantec
Dartmouth, NS
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You will apply your technical skills, project delivery, and leadership to a complex array of multi-disciplinary planning, design and construction projects for a wide range of infrastructure…
Added 12 days ago
Management Consultant - Mining
Accenture
Calgary, AB · Vancouver, BC · Toronto, ON · Montreal, QC
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…executive-ready communications and engaging confidently with project sponsors and senior corporate…
Added 27 days ago
Mining Engineer
SLR Consulting
Vancouver, BC
Full-time
Ready to influence how underground mines are designed, optimized, and evaluated around the world? As our new Mining Engineer, you will play an important role on a team whose work is…
Added 2 months ago
Senior Project Manager, Environmental Assessments and TRPAPs
HDR
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Full-time
In the role of Senior Project Manager, Environmental Assessments and TRPAPs we'll count on you to:
Added 10 days ago
Senior Performance Testing Engineer
Cognizant
Toronto, ON
$75,000 to $95,000 CAD / year
Full-time
We are seeking a Senior Performance Testing Engineer with hands-on experience in JMeter and Dynatrace to ensure the speed, scalability, and stability of our enterprise applications. In this…
Added 10 days ago
Sr. Site Process Engineer
Syensqo
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Syensqo is seeking a Sr. Site Process Engineer to provide process engineering leadership and technical expertise to the chemical manufacturing operation at the Cytec Canada Inc (a member of…

Closed listing

SuperQubit Inc.

Senior Cryptographic Protocol Engineer

Markham, ON, Canada

Job type: Full-time
Closing date: Sep 26, 2026
Experience: 5+ years of professional software engineering experience, with significant work in systems, networking, cybersecurity, or cryptographic software
Posting language: English
Posted: Aug 27, 2026

This opening has closed.

The original listing is kept below for reference.

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Original job description

Archived listing. The details below describe a past opening.

Job Title: Senior Cryptographic Protocol Engineer

Office Location: 7303 Warden Ave. Markham, ON

Employment Type: Full‑time

Application Email: careers@superqubit.ai

We are building a novel secure data-encryption protocol around key material generated by our Quantum Key Distribution infrastructure - not another AES wrapper, but a new cryptographic construction designed specifically around what QKD-derived keys make possible. We need someone who can take that specification from idea to a production-grade, battle-tested Rust implementation running between geographically distributed nodes.

About The Role

The successful candidate will work closely with our technical team to translate a defined cryptographic protocol into a robust, secure, and production-quality implementation.

Rust will be the primary implementation language, but this is a systems and network-security role rather than a conventional application-development position. The ideal candidate has strong experience across cryptography, secure networking, systems programming, distributed systems, and security-sensitive software development.

You do not need to be a QKD expert. Our team will provide the necessary background on QKD, the existing infrastructure, and how shared key material is made available between nodes. Your job is to understand the protocol specification, design its software architecture, implement it securely, and integrate it with the surrounding communications infrastructure.

Responsibilities

Implement a novel cryptographic protocol based on a defined protocol specification.
Design and develop the core implementation primarily in Rust.
Design secure interfaces between the cryptographic protocol and the underlying QKD key-management infrastructure.
Develop mechanisms for securely consuming, managing, rotating, and tracking shared key material between communicating nodes.
Design and implement protocol state machines, session management, key lifecycle management, and error handling.
Integrate the protocol with existing networking and application infrastructure.
Implement protections against protocol-level attacks - replay, message manipulation, key reuse, state confusion, and related threats.
Develop comprehensive unit, integration, interoperability, performance, and security tests.
Analyze protocol behavior under failure conditions: lost messages, node restarts, key exhaustion, synchronization problems, network interruptions.
Document protocol implementation, interfaces, assumptions, security-sensitive design decisions, and operational procedures.
Participate in security reviews alongside cryptography and QKD specialists.
Profile and optimize for performance, latency, memory usage, concurrency, and efficient key consumption.
Troubleshoot systems and networking issues across geographically distributed nodes.
Travel between project sites and QKD/network infrastructure located in different cities as required.

Programming Languages

Required

Rust - systems, networking, or security-sensitive software
C/C++ - systems programming, integration with existing libraries
Python - automation, testing, tooling, crypto prototyping
Bash / Linux shell scripting

Preferred

Go
Java or C# - for integration with existing infrastructure
Rust FFI and integration between Rust and C/C++ libraries

Cryptography & Security

Required

Strong understanding of applied cryptography and cryptographic protocols, and experience implementing security-sensitive software, with a solid grasp of:

Symmetric cryptography
Key management and key lifecycle
Key derivation and key separation
Authentication and integrity
Randomness and entropy
Nonces, initialization vectors, and counters
Replay protection
Secure session establishment
Protocol state machines

Plus a working understanding of threat modeling, secure software design, and the ability to identify security risks in protocol implementations.

Preferred

Experience with cryptographic protocol design or implementation
Experience reviewing cryptographic implementations
Experience with cryptographic libraries and APIs
Experience with HSMs, secure enclaves, or other key-protection technologies
Familiarity with formal methods, protocol verification, or cryptographic security analysis
Familiarity with post-quantum cryptography
Experience with QKD or quantum communications

Systems & Computer Engineering

Strong understanding of Linux operating systems
Experience with processes, threads, concurrency, synchronization, and memory management
Experience developing multithreaded and asynchronous software
Strong understanding of computer networking and networking stacks
Experience with performance profiling, debugging, and optimization
Understanding of hardware/software interfaces
Experience troubleshooting systems at both software and OS levels

Networking & Distributed Systems

Strong understanding of TCP/IP and UDP networking
Experience with IPv4/IPv6, Ethernet, sockets, routing, and network troubleshooting
Experience designing or implementing network protocols
Experience with distributed systems and inter-node communication
Understanding of network latency, reliability, synchronization, and failure recovery
Experience with secure network communications
Familiarity with TLS, QUIC, IPsec, WireGuard, or the Noise Protocol Framework is an asset
Experience using Wireshark, tcpdump, and standard Linux networking tools

Software Engineering & DevOps

Strong experience with Git and modern software development workflows
Experience with automated unit, integration, and system testing
Experience with CI/CD
Experience with Docker and containerized environments
Familiarity with static analysis, dependency management, and vulnerability scanning
Experience with debugging and profiling tools
Familiarity with observability, logging, monitoring, and system diagnostics
Experience working in Linux-based development and production environments
Strong understanding of software architecture and maintainable code design

Protocol Documentation

Experience documenting protocol specifications, message formats, state machines, key-management procedures, error conditions, and security assumptions.

You should be comfortable converting complex technical and cryptographic concepts into clear engineering documentation that can be implemented, tested, reviewed, and independently understood by other engineers.

QKD Experience

QKD expertise is not a requirement

The QKD infrastructure and its key-management mechanisms are already available. The selected engineer will work with our team to understand how shared key material is generated and made available between nodes, how keys are identified and retrieved, key availability and consumption constraints, key lifecycle and rotation requirements, the interfaces/APIs exposed by the QKD infrastructure, and its operational constraints.

Your responsibility is to build the cryptographic protocol on top of this key-management capability - not to develop the QKD system itself.

On-Site & Travel Requirements

This is an on-site position based in Toronto, Ontario. The project includes geographically distributed QKD and network nodes located in different cities, so the successful candidate must be comfortable traveling between project sites to support development, testing, deployment, integration, and troubleshooting.

Based in Toronto, or willing to relocate
Willing to travel between project sites in Canada
Comfortable in data centers, network facilities, and labs
Able to troubleshoot on-site, across software and networking layers
Valid driver’s licence, if required for site travel
Able to satisfy applicable site-access and security requirements
Canadian citizen or permanent resident - required for project/security clearance

Personal Qualities

Exceptional attention to detail, particularly with security-sensitive code
Strong analytical and problem-solving abilities
Enjoys reasoning about complex protocols and distributed systems
Comfortable challenging assumptions and identifying potential security weaknesses
Works independently and takes ownership of technical problems
Communicates complex technical concepts clearly, in writing and in person
Collaborates well with cryptographers, QKD engineers, network engineers, and software developers
Comfortable working with novel technology where established patterns may not exist
Pragmatic - balances security, performance, reliability, and engineering complexity
Strong sense of responsibility when working with cryptographic keys and security-critical infrastructure

Education & Experience

Bachelor’s or Master’s degree in Computer Science, Computer Engineering, Electrical Engineering, Cybersecurity, Mathematics, or a related field
5+ years of professional software engineering experience, with significant work in systems, networking, cybersecurity, or cryptographic software
Demonstrated professional experience with Rust
Demonstrated experience implementing or working with secure protocols or security-sensitive systems
Equivalent combinations of education, professional experience, and demonstrated technical expertise may be considered

What Success Looks Like

In this role, you will take a novel cryptographic protocol from specification to a secure, tested, interoperable implementation. You’ll be expected to think beyond simply implementing cryptographic operations - the implementation must correctly handle the complete protocol lifecycle: key acquisition, key usage, session state, message processing, failures, concurrency, synchronization, and secure recovery.

The end result should be a robust, well-engineered implementation capable of reliably operating between geographically distributed nodes connected through the QKD infrastructure.

Important Security Expectation

Because this project involves a novel cryptographic protocol, we distinguish between implementing a protocol and establishing that the underlying cryptographic construction is secure. You will be expected to identify implementation- and protocol-level security risks and participate in security reviews. Independent cryptographic review of the underlying construction may also be performed by cryptography specialists.

How to Apply

Send your resume, GitHub or relevant open-source contributions, and a short note on a systems or cryptography project you’re proud of to careers@superqubit.ai.

SuperQubit is committed to building secure, innovative technologies for the quantum era. We welcome applicants who are passionate about shaping the future of cybersecurity.

About employer

More about this job

Responsibilities

Translate a defined cryptographic protocol specification into a production-grade Rust implementation for geographically distributed nodes. Design secure interfaces for QKD key-management and implement protections against protocol-level attacks.

Requirements

Requires a degree in Computer Science or related field and 5+ years of professional software engineering experience with a focus on Rust and secure systems. Candidates must be Canadian citizens or permanent residents and be willing to travel to project sites in Canada.

Skills

Rust
Applied Cryptography
Systems Programming
Network Security
Distributed Systems
C/C++
Python
TCP/IP
Key Management
Protocol Design
Linux
Threat Modeling
Asynchronous Programming
CI/CD
Docker
Git

Visa sponsorship

Not detected in the job text

Keywords

Rust
C++
Python
Bash
Quantum Key Distribution
QKD
Symmetric Cryptography
Key Lifecycle
Authentication
Entropy
Replay Protection
State Machines
Linux
TCP/IP
UDP
IPv4/IPv6
TLS
QUIC
IPsec
WireGuard
Noise Protocol Framework
Wireshark
Tcpdump
Git
Docker
CI/CD
Post-Quantum Cryptography
HSM
Secure Enclaves
Formal Methods

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