Senior Software Engineer, Durable Objects (DO) jobs in United States
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Cloudflare · 1 month ago

Senior Software Engineer, Durable Objects (DO)

positionHybrid
timeFull-time
remoteHybrid
senioritySenior Level
date5+ years exp

Cloudflare is on a mission to help build a better Internet, running one of the world’s largest networks that powers millions of websites. The Senior Software Engineer will build Durable Objects for the Cloudflare Developer Platform, focusing on designing and developing low-level routing and storage systems to enhance performance and reliability.

AnalyticsEnterprise SoftwareSecurityWeb Hosting
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H1B Sponsor Likelynote

Responsibilities

Build the Durable Objects runtime which enables Cloudflare customers to build real-time chat applications, multiplayer games, and AI agents
Improve reliability, scalability, and performance by developing new system capabilities
Own your code end-to-end from design to production
Solve complex technical challenges with production distributed systems
Develop software in JavaScript, TypeScript, Rust, and C++

Qualification

Systems programming languagesDistributed systems designData structuresAlgorithmsCloud platformsTechnical leadershipJavaScriptTypeScriptRustC++Problem-solving

Required

5+ years of experience writing systems software
Operational mindset – we don't just write code, we own it in production
Strong foundation in data structures, algorithms, and system design
Deep expertise in at least one systems programming language (e.g., C/C++ or Rust)
Experience designing and architecting large-scale distributed systems
Familiarity with cloud platforms, particularly serverless architectures
Experience as a technical leader or team lead, driving engineering decisions

Preferred

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

Company

Cloudflare

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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

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Matthew Prince
CEO & Co-Founder
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Lee Holloway
Co-Founder & Lead Engineer
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Recent News

Winnipeg Free Press
Spanish soccer league battles Cloudflare over piracy, says U.S. company ignores illegal content
2026-01-09
San Francisco Chronicle
Spanish soccer league battles Cloudflare over piracy, says US company ignores illegal content
2026-01-09
Telecompaper
Cloudflare handed USD 14 mln anti-piracy fine in Italy
2026-01-09
Company data provided by crunchbase