Senior Software Engineer, Workers Runtime jobs in United States
cer-icon
Apply on Employer Site
company-logo

Cloudflare · 1 month ago

Senior Software Engineer, Workers Runtime

positionHybrid
timeFull-time
remoteHybrid
seniorityMid, Senior Level
date2+ years exp

Cloudflare is on a mission to help build a better Internet, operating one of the world's largest networks that powers millions of websites. The Senior Software Engineer will be part of the Workers Runtime team, focusing on delivering features and improvements to the Runtime that executes customer code at the edge, ensuring performance and security in a fast-paced environment.

AnalyticsEnterprise SoftwareSecurityWeb Hosting
check
H1B Sponsor Likelynote

Responsibilities

Work with a team of passionate, talented engineers that are building innovative products that bring security and speed to millions of internet users each day
Play an active part in shaping product features based on what’s technically possible
Make sure our company hits our ambitious goals from an engineering standpoint

Qualification

C++RustLinux-based systemsWebAssemblyJavaScriptDistributed systemsCloud platformsData structuresAlgorithmsObject-oriented designFunctional designSoft skills

Required

At least 2 years of recent professional experience with C++ or Rust
Solid understanding of computer science fundamentals including data structures, algorithms, and object-oriented or functional design
An operational mindset - we don't just write code, we also own it in production
Deep understanding of the web and technologies such as web browsers, HTTP, JavaScript and WebAssembly
Experience working in low-latency real time environments such as game streaming, game engine architecture, high frequency trading, payment systems
Experience debugging, optimizing and identifying failure modes in a large-scale Linux-based distributed system

Preferred

Experience building high performance distributed systems in Rust
Experience working with cloud platforms, especially server-less platforms
Experience with the internals of JS engines such as V8, SpiderMonkey, or JavaScriptCore
Experience with standalone WebAssembly runtimes such as Wasmtime, Wasmer, Lucet, etc
Deep Linux/UNIX systems, kernel, or networking knowledge
Contributions to large open source projects

Company

Cloudflare

twittertwittertwitter
Glassdoor3.3
company-logo
Cloudflare is a web performance and security company that provides online services to protect and accelerate websites online.
dateFounded in 2009
location
San Francisco, California, USA
people-size1001-5000 employees
web-link
http://www.cloudflare.com

H1B Sponsorship

Cloudflare has a track record of offering H1B sponsorships. Please note that this does not guarantee sponsorship for this specific role. Below presents additional info for your reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (117)
2024 (115)
2023 (66)
2022 (98)
2021 (83)
2020 (37)

Funding

Current Stage
Public Company
Total Funding
$2.08B
Key Investors
Franklin TempletonFidelityUnion Square Ventures
2025-06-13Post Ipo Debt· $1.75B
2019-09-12IPO
2019-03-12Series E· $150M

Leadership Team

leader-logo
Matthew Prince
CEO & Co-Founder
linkedin
leader-logo
Lee Holloway
Co-Founder & Lead Engineer
linkedin

Recent News

The Register
Cloudflare CEO threatens to make the Winter Olympics a political football after Italy slugs it with a fine
2026-01-12
IndiaTimes
Cloudflare threatens Olympic services over piracy fine
2026-01-11
Tech in Asia
Cloudflare threatens Italy exit after $16m anti-piracy fine
2026-01-11
Company data provided by crunchbase