Cloudflare · 1 week ago
Senior Software Engineer, Durable Objects (DO)
Austin, TX
Full-time
Hybrid
Senior Level
5+ years expCloudflare is on a mission to help build a better Internet by running one of the world’s largest networks that powers millions of websites. In this role, you will build Durable Objects for the Cloudflare Developer Platform, focusing on developing the routing and storage systems that enable customers to create stateful serverless applications.
AnalyticsEnterprise SoftwareSecurityWeb Hosting
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
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
Cloudflare is a web performance and security company that provides online services to protect and accelerate websites online.
1001-5000 employees
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 CompanyTotal Funding
$2.08BKey Investors
Franklin TempletonFidelityUnion Square Ventures
2025-06-13Post Ipo Debt· $1.75B
2019-09-12IPO
2019-03-12Series E· $150M
Leadership Team
Matthew Prince
CEO & Co-Founder
Lee Holloway
Co-Founder & Lead Engineer
Recent News
2026-01-24
2026-01-23
2026-01-20
Company data provided by crunchbase