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Senior Software Engineer, Workers Runtime

Cloudflare

On-site — Austin, TX | New York, NY | San Francisco, CA | London, UK

4d ago

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Senior Software Engineer, Workers Runtime

Cloudflare

On-site — Austin, TX | New York, NY | San Francisco, CA | London, UKListed 4d agoPosted by the employer Jan 31, 2025Listing ends Dec 28, 2026

Compensation: $185k–$266k
Location: Austin, TXNew York, NYSan Francisco, CA and 1 more
On-siteMore on-site jobs: United States More on-site jobs: United Kingdom
Employment: Full-timeSenior
Category: EngineeringCybersecurity

Role skills

c++rust javascript web design linux serverless cloudflare

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About the job

5 min read11 sections

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 | New York, NY | San Francisco, CA | London, UK

About the Role

Cloudflare’s Emerging Technologies & Incubation team builds new products at the edge by combining Cloudflare’s network scale with rapid product incubation. This role is on the Workers Runtime team, which ships the runtime that executes customer code at the edge. You’ll improve performance, expand JavaScript and WebAssembly support, and help the runtime scale safely and efficiently.

Responsibilities

Build features and improvements for the Workers Runtime.
Improve runtime performance, reliability, and scale.
Expand JavaScript API and WebAssembly support.
Help shape features based on what is technically possible.
Own code in production and debug issues in a large-scale distributed system.
Work in a fast-paced, iterative environment that balances product goals with technical execution.

Desirable Skills, Knowledge & Experience

2+ years of recent professional experience with C++ or Rust.
Strong computer science fundamentals, including data structures, algorithms, and software design.
Operational mindset and experience owning production systems.
Deep understanding of the web, including HTTP, JavaScript, and WebAssembly.
Experience debugging and optimizing large-scale Linux-based distributed systems.

Bonus Points

Experience building high-performance distributed systems in Rust.
Experience with cloud or serverless platforms.
Familiarity with JS engine internals such as V8, SpiderMonkey, or JavaScriptCore.
Experience with standalone WebAssembly runtimes such as Wasmtime, Wasmer, or Lucet.
Deep Linux, UNIX, kernel, or networking knowledge.
Contributions to large open source projects.

Compensation

Compensation may be adjusted depending on work location.

For Bay Area based hires: Estimated annual salary of $194,000 - $266,000
For New York City, New Jersey, Washington, Washington DC, and California (excluding Bay Area) based hires: Estimated annual salary of $185,000 - $254,000

Equity

This role is eligible to participate in Cloudflare’s equity plan.

Benefits

Cloudflare offers a complete package of benefits and programs to support you and your family. Our benefits programs can help you pay health care expenses, support caregiving, build capital for the future and make life a little easier and fun! The below is a description of our benefits for employees in the United States, and benefits may vary for employees based outside the U.S.

Health & Welfare Benefits

Medical/Rx Insurance
Dental Insurance
Vision Insurance
Flexible Spending Accounts
Commuter Spending Accounts
Fertility & Family Forming Benefits
On-demand mental health support and Employee Assistance Program
Global Travel Medical Insurance

Financial Benefits

Short and Long Term Disability Insurance
Life & Accident Insurance
401(k) Retirement Savings Plan
Employee Stock Participation Plan

Time Off

Flexible paid time off covering vacation and sick leave
Leave programs, including parental, pregnancy health, medical, and bereavement leave

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.

Role signals

Equity: This role is eligible to participate in Cloudflare’s equity plan.
Benefits: Retirement plan, Health insurance, Dental insurance, Vision insurance, Life insurance, Short-term disability, Long-term disability, Paid parental leave, Paid medical leave, Flexible PTO, Mental health support, Employee assistance program, Commuter benefits, Fertility benefits

About Cloudflare

Cloudflare, Inc., is an American technology company headquartered in San Francisco, California, that provides a range of internet services, including content de…Based on Wikipedia · CC BY-SA 4.0