Jobs in Canada

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Added 2 months ago
Senior Mechanical Engineer
Mott MacDonald
Toronto, ON
Mott MacDonald is currently seeking a highly motivated Senior Mechanical Engineer to join our dynamic team of professionals in our Toronto location. You will work in a professional…
Added 4 months ago
C
Mechanical Engineer III
CRB
Mississauga, Ontario
- $100,000 to $135,000 CAD / year
- Full-time
Leads systems design programming and master planning on intermediate projects with support from Design Lead or Senior Engineer.
Added 4 months ago
C
Electrical Engineer II
CRB
Mississauga, Ontario
- $80,000 to $105,000 CAD / year
- Full-time
Participates in basic project systems design programming and master planning with support from Design Lead or Senior Engineer.
Added 4 months ago
AG
Senior Radio Frequency System Specialist
ADGA Group Consultants Inc
Ottawa, Ontario
- $107,200 to $130,000 CAD / year
- Full-time
Must have a minimum of 5 years experience performing at least one of the following:
Added 2 months ago
Senior Software Engineer, Durable Objects (DO)
Cloudflare
Toronto, ON
…help evolve the runtime and the low-level routing and storage systems that support real-time chat, multiplayer games, AI agents, and other stateful workloads at…
Added 2 months ago
TH
Fire Protection Manager
The HIDI Group
Toronto, ON
- Full-time
You will play a key role in managing team performance, project execution, client relationships, business development, and the continued growth of the department. This position is ideal for…
Added 4 months ago
VA
Controls & Automation Engineers (Intermediate to Lead Roles)
Volcanix Automation Inc.
Vaughan, Ontario
- Full-time
Develop, configure, commission, and debug control systems and automated equipment
Added 3 months ago
KG
Intermediate Electrical Engineer
KGS Group
Winnipeg, MB
- Full-time
…completion. You will be responsible for establishing and maintaining project budgets and schedules, with guidance and review from senior…
Added 2 months ago
MR
Engineer Computer - Cosmopolitan
MGM Resorts International
NB · Chiasson Office, NB
- Full-time
Document project metrics for presentation to Senior Management, and coordinate tasks for deployments
Added 2 months ago
S
Electrical Engineer, Mission Critical
Stantec
Ottawa, ON
- Full-time
The MCF (Mission Critical Facilities) Engineer performs technical duties under the supervision of a Senior Project Engineer or Project Engineer. Understands and identifies project…
Added 2 months ago
QP
Senior Cloud Systems Engineer
QuadReal Property Group
Toronto, ON
- Full-time
This role can be based in Vancouver, BC, Toronto, ON, or Calgary, AB
Added 2 months ago
QP
Senior Cloud Systems Engineer
QuadReal Property Group
Vancouver, BC
- Full-time
This role can be based in Vancouver, BC, Toronto, ON, or Calgary, AB
Added 2 months ago
Q
Senior Mechanical Engineer
Qnity
Kingston, ON
- Full-time
Qnity is seeking an innovative and hands-on Mechanical Engineer to lead the design, development, and scale-up of advanced technologies from concept through pilot-scale demonstration and…
Added 2 months ago
A
Senior Project Manager – Airport Infrastructure
AtkinsRéalis
Vancouver, BC
- Full-time
…technology to transform the world's'infrastructure and energy systems. Together, with our industry partners and clients, and our global team of consultants, designers, engineers and project…
Added 2 months ago
Senior Automation Engineer
LAPORTE L.E.I.
London, ON · Toronto, ON
Flexible Work Arrangements: Hybrid work mode, with a minimum of 2 days per week in the office;
Added 2 months ago
Senior Automation Engineer
LAPORTE L.E.I.
London, ON
Flexible Work Arrangements: Hybrid work mode, with a minimum of 2 days per week in the office;
Added 2 months ago
Senior Automation Engineer
LAPORTE L.E.I.
Toronto, ON
Flexible Work Arrangements: Hybrid work mode, with a minimum of 2 days per week in the office;
Added 2 months ago
Surveyor (Naval)
Lloyds Register
Halifax, NS
We are looking for an experienced senior surveyor who will assess the design, production, and in-service aspects of engineering assets, using procedures, experience and knowledge…
Added 7 months ago
K
Requirements Manager, Kiewit Infrastructure Engineers
Kiewit
Oakville, Ontario
- Full-time
…Engineering & Technology group is focused on bringing in experienced systems professionals to set standards, lead engineering teams, deliver training, and support districts and projects.…
Added 4 months ago
Project Utility Engineer
Government of Alberta
Edmonton, Alberta
Prepare presentations, briefing materials, and technical recommendations for senior leadership, project teams, industry stakeholders, and external partners.
Added 4 months ago
A
Senior ETCS Signalling Engineer
AECOM
Markham, ON · Mississauga, Ontario
- $150,000 to $200,000 CAD / year
- Full-time
AECOM Markham is currently seeking a highly motivated Senior ETCS Engineer to join our Signals Canada team.
Added 4 months ago
A
Senior ETCS Signalling Engineer
AECOM
Mississauga, Ontario
- $150,000 to $200,000 CAD / year
- Full-time
AECOM Mississauga is currently seeking a highly motivated Senior ETCS Engineer to join our Signals Canada team.
Added 4 months ago
Senior Engineer (Hybrid)
Kerr Wood Leidal Associates
Calgary, Alberta · Burnaby, British Columbia
We’re seeking a Senior Engineer to support and lead mine water management planning and detailed design projects. This role is ideal for a technically strong professional who can…
Added 4 months ago
ED
Ingénieur, Conception d'infrastructures centres de donnée | Data Center Infrastructure Design Engineer
Estruxture Data Centers
Montreal, Quebec
- Full-time
Added 4 months ago
Lead Electrical Engineer - Water & Wastewater
GHD Group Pty Ltd
Waterloo, Ontario
Our Waterloo and/or GTA offices are looking for a Lead Electrical Engineer - Water & Wastewater to join the Engineering Design Organization (EDO) group. As a member of the multidisciplinary…

Cloudflare

Senior Software Engineer, Durable Objects (DO)

Toronto, ON, Canada

Apply on boards.greenhouse.io About employer

Applications open in a new tab.

Job details

Experience: 5+ years of experience writing systems software.
Posting language: English
Posted: Sep 4, 2026

Original job description

About Us

At Cloudflare, we are on a mission to help build a better Internet. Today the company runs one of the world’s largest networks that powers millions of websites and other Internet properties for customers ranging from individual bloggers to SMBs to Fortune 500 companies. Cloudflare protects and accelerates any Internet application online without adding hardware, installing software, or changing a line of code. Internet properties powered by Cloudflare all have web traffic routed through its intelligent global network, which gets smarter with every request. As a result, they see significant improvement in performance and a decrease in spam and other attacks. Cloudflare was named to Entrepreneur Magazine’s Top Company Cultures list and ranked among the World’s Most Innovative Companies by Fast Company.

At Cloudflare, we’re not looking for people who wait for a polished roadmap; we’re looking for the builders who see the cracks in the Internet that everyone else has simply learned to live with. We value candidates who have the instinct to spot a "normalized" problem and the AI-native curiosity to create a solution using the latest tools. Our culture is built on iteration, leveraging AI to ship faster today to make it better tomorrow, while ensuring that every improvement, no matter how small, is shared across the team to lift everyone up. If you’re the type of person who values curiosity over bureaucracy, and that AI is a partner in solving tough problems to keep the Internet moving forward, you’ll fit right in.

Available Locations: Austin, TX

About the Role

Cloudflare’s Emerging Technologies & Incubation team builds and launches bold new products on Cloudflare’s edge network. This role is on the Durable Objects team, which powers stateful serverless applications for Cloudflare customers. You’ll help evolve the runtime and the low-level routing and storage systems that support real-time chat, multiplayer games, AI agents, and other stateful workloads at scale.

Responsibilities

Build and improve the Durable Objects runtime.
Design and develop the low-level routing and storage systems that power customer applications.
Improve reliability, scalability, performance, and feature depth.
Own code end-to-end from design through production.
Solve complex problems in production distributed systems.
Work across JavaScript, TypeScript, Rust, and C++.
Help drive the continued evolution of the system.

Desirable Skills, Knowledge & Experience

5+ years of experience writing systems software.
Operational mindset with experience owning code in production.
Strong foundation in data structures, algorithms, and system design.
Deep expertise in at least one systems programming language such as C/C++ or Rust.
Experience designing and architecting large-scale distributed systems.
Familiarity with cloud platforms, especially serverless architectures.
Experience as a technical leader or team lead, driving engineering decisions.

Bonus Points

Experience working on database internals, especially SQLite.
Deep understanding of web technologies such as browsers, HTTP, JavaScript, and WebAssembly.
Background in low-latency, real-time environments such as game streaming, high-frequency trading, or payment systems.
Experience debugging, optimizing, and identifying failure modes in large-scale Linux-based distributed systems.

What Makes Cloudflare Special?

We’re not just a highly ambitious, large-scale technology company. We’re a highly ambitious, large-scale technology company with a soul. Fundamental to our mission to help build a better Internet is protecting the free and open Internet.

Project Galileo: Since 2014, we've equipped more than 2,400 journalism and civil society organizations in 111 countries with powerful tools to defend themselves against attacks that would otherwise censor their work, technology already used by Cloudflare’s enterprise customers--at no cost.

Athenian Project: In 2017, we created the Athenian Project to ensure that state and local governments have the highest level of protection and reliability for free, so that their constituents have access to election information and voter registration. Since the project, we've provided services to more than 425 local government election websites in 33 states.

1.1.1.1: We released 1.1.1.1 to help fix the foundation of the Internet by building a faster, more secure and privacy-centric public DNS resolver. This is available publicly for everyone to use - it is the first consumer-focused service Cloudflare has ever released. Here’s the deal - we don’t store client IP addresses never, ever. We will continue to abide by our privacy commitment and ensure that no user data is sold to advertisers or used to target consumers.

Sound like something you’d like to be a part of? We’d love to hear from you!

Please note that applicants who progress to the offer stage of the interview process may be asked to attend an in-person interview within one of the Cloudflare Offices or Cloudflare Hubs. More details about this will be available at that stage of the interview process.

This position may require access to information protected under U.S. export control laws, including the U.S. Export Administration Regulations. Please note that any offer of employment may be conditioned on your authorization to receive software or technology controlled under these U.S. export laws without sponsorship for an export license.

Cloudflare is proud to be an equal opportunity employer. We are committed to providing equal employment opportunity for all people and place great value in both diversity and inclusiveness. All qualified applicants will be considered for employment without regard to their, or any other person's, perceived or actual race, color, religion, sex, gender, gender identity, gender expression, sexual orientation, national origin, ancestry, citizenship, age, physical or mental disability, medical condition, family care status, or any other basis protected by law. We are an AA/Veterans/Disabled Employer.

Cloudflare provides reasonable accommodations to qualified individuals with disabilities. Please tell us if you require a reasonable accommodation to apply for a job. Examples of reasonable accommodations include, but are not limited to, changing the application process, providing documents in an alternate format, using a sign language interpreter, or using specialized equipment. If you require a reasonable accommodation to apply for a job, please contact us via e-mail at hr@cloudflare.com or via mail at 101 Townsend St. San Francisco, CA 94107.

Apply on boards.greenhouse.io About employer

More about this job

Responsibilities

Build and improve the Durable Objects runtime and the low-level routing and storage systems. Solve complex production problems to enhance reliability, scalability, and performance for stateful serverless applications.

Requirements

Requires 5+ years of experience in systems software and deep expertise in C/C++ or Rust. Candidates should have a strong background in architecting large-scale distributed systems and an operational mindset for production code.

Skills

Systems Software
Distributed Systems
Rust
C++
JavaScript
TypeScript
System Design
Data Structures
Algorithms
Serverless Architecture
SQLite
WebAssembly
HTTP
Linux
Low-latency Systems
Technical Leadership

Visa sponsorship

Not detected in the job text

Keywords

Durable Objects
Serverless
Edge Network
Rust
C++
JavaScript
TypeScript
Distributed Systems
SQLite
WebAssembly
HTTP
Linux
Low-latency
System Design
Cloudflare
Runtime
Storage Systems
Routing
AI Agents
Multiplayer Games
Real-time Chat

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Work requirements

Jobs in Canada