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Added 1 month ago
Highway Design Engineer - Open Roads
Egis Group
Markham, ON
$90,000 to $125,000 CAD / year
Full-time
The Intermediate Highway Design Engineer – OpenRoads role is based in Markham, Ontario, Canada and supports the delivery of transportation infrastructure projects within a multidisciplinary…
Added 25 days ago
Project Engineering Manager, Bridges
AtkinsRéalis
Toronto, ON
Full-time
…professionals globally, and involvement in some of the most complex structures in the world. The Bridges Department – Central Region (Great Toronto Area), is looking for a Senior Project…
Added 15 days ago
Senior Structural Engineer
Mott MacDonald
Toronto, ON
Mott MacDonald has an immediate need for a Senior Structural Engineer to work on Built Environment related projects in Canada and assist in directing Built Environment staff performing…
Added 2 months ago
HVAC Design Engineer (Entry Level)
CRB
Mississauga, Ontario
$65,000 to $85,000 CAD / year
Full-time
The Entry-Level Mechanical Engineer focuses on the design and engineering of HVAC and mechanical utilities for buildings. Typical tasks and deliverables include load calculations, utility…
Added 2 months ago
Electrical Engineer II
CRB
Mississauga, Ontario
$80,000 to $105,000 CAD / year
Full-time
The Electrical Engineer focuses on the design and engineering of power, lighting, grounding/bonding, special systems (e.g., telephone/ data, security, fire alarm), raceway, cable tray, and…
Added 2 months ago
Senior Pavement / Surfacing Engineer
WSP
Edmonton, Alberta
Full-time
Strong expertise in pavement design principles across flexible, rigid, composite, and gravel pavement structures.
Added 16 days ago
Senior Software Engineer, Durable Objects (DO)
Cloudflare
Toronto, ON
Strong foundation in data structures, algorithms, and system design.
Added 11 days ago
Junior Geotechnical Engineer
Tetra Tech
Vancouver, BC
Full-time
Assisting with the design of civil earthwork structures and the preparation of construction specifications.
Added 11 days ago
Intermediate Geotechnical Engineer
Tetra Tech
Vancouver, BC
Full-time
Participating in the design of civil earthwork structures and assisting with the preparation of construction specifications.
Added 11 days ago
Transmission Engineer – Civil, Electrical, Protection & Control
Outright Consulting
ON · Ontario, Canada
Full-time
Perform transmission line design, including structures, foundations, conductors, insulators, grounding, clearances, and sag/tension calculations.
Added 11 days ago
Intermediate Structural Engineer
Salas O'Brien
Woodbridge, ON
Full-time
We are seeking an Intermediate Structural Engineer to join our growing team in Woodbridge, Ontario. In this role, you will contribute to the design, analysis, and delivery of complex heavy…
Added 11 days ago
Senior Low-Level Control Engineer
Humanoid
Burnaby, BC
Full-time
We are looking for a Senior Control Engineer to join our Controls Team in Vancouver, focusing on SW control development and integration of robotic actuators and sensors.
Added 11 days ago
AI Engineer - Canada
Pulsora, Inc.
Remote, Canada
$60,000 to $70,000 CAD / year
Full-time · Remote
LLM Integration & Development: Design, develop, and deploy production-grade applications leveraging various LLMs, context optimization, etc.
Added 10 days ago
Directeur(trice), solutions clients SAP | SAP Customer Solution Director
Talan
Montreal, QC
Full-time
Added 5 months ago
Requirements Manager, Kiewit Infrastructure Engineers
Kiewit
Toronto, Ontario
Full-time
2025 ENR National Contractor Rankings #1 for Transportation and #3 Top 100 design build firms
Added 5 months ago
Geotechnical Engineer, Construction Engineering Services
Kiewit
Burnaby, British Columbia
Full-time
Kiewit Infrastructure Engineering has an immediate opening for a mid-level Geotechnical Engineer to join our growing Construction Engineering Services group in Burnaby, BC.
Added 5 months ago
Requirements Manager, Kiewit Infrastructure Engineers
Kiewit
Oakville, Ontario
Full-time
2025 ENR National Contractor Rankings #1 for Transportation and #3 Top 100 design build firms
Added 5 months ago
Electrical Designer - Mississauga
Hatch
Mississauga, Ontario
Full-time
…Infrastructure projects from Feasibility studies to Detail design. The Senior Electrical Designer will also assist in the resolution of all technical design issues and direct the activities…
Added 2 months ago
Intermediate Structural Engineer - Bridges
Entuitive
Remote, Canada
Full-time · Remote
Entuitive is looking for an Intermediate Engineer to primarily focus on structural design and evaluation of bridges. This role will include aspects of project delivery, production of…
Added 2 months ago
Intermediate Structural Engineer - Bridges
Entuitive
Remote, Canada
Full-time · Remote
Entuitive is looking for an Intermediate Engineer to primarily focus on structural design and evaluation of bridges. This role will include aspects of project delivery, production of…
Added 2 months ago
Senior Structural Engineer - Bridges
Entuitive
Remote, Canada
Full-time · Remote
Entuitive is looking for an Senior Engineer to primarily focus on structural design and evaluation of bridges. This role will include aspects of project delivery, production of structural…
Added 2 months ago
Senior Structural Engineer - Bridges
Entuitive
Remote, Canada
Full-time · Remote
Entuitive is looking for an Senior Engineer to primarily focus on structural design and evaluation of bridges. This role will include aspects of project delivery, production of structural…
Added 2 months ago
Construction Inspector
ISL Engineering & Landservices
Calgary, Alberta
…Transportation, Municipal and Community, Bridges, Building and Structures and Land and Environment. Learn more about our areas of…
Added 1 month ago
Ingénieur(e) Application / Application Engineer
Veolia Environnement SA
Montreal, QC
Full-time
As an Application Engineer, you will be the primary technical point of contact for our clients. You will collaborate closely with sales and process engineering teams to design innovative…
Added 2 months ago
Senior Technical Manager, Bridges and Civil Structures
WSP
Burlington, Ontario
Design and deliver complex bridge and transportation structures that enhance safety and connectivity across Ontario

Cloudflare

Senior Software Engineer, Durable Objects (DO)

Toronto, ON, Canada

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

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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 [email protected] or via mail at 101 Townsend St. San Francisco, CA 94107.

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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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