New

Senior Systems Engineer, Durable Objects DevEx

Cloudflare, Inc.
United States, California, San Francisco
101 Townsend Street (Show on map)
Nov 24, 2025
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. We realize people do not fit into neat boxes. We are looking for curious and empathetic individuals who are committed to developing themselves and learning new skills, and we are ready to help you do that. We cannot complete our mission without building a diverse and inclusive team. We hire the best people based on an evaluation of their potential and support them throughout their time at Cloudflare. Come join us! Available Location: Austin, Lisbon, London Role Summary Cloudflare is building the future of the Internet, and the Workers platform is at the forefront of that mission. We're looking for a Senior Software Engineer to join the team behind Durable Object, our globally-distributed, strongly-consistent coordination and state primitive, focusing on the Developer Experience. You will be responsible for the entire developer journey, from their first line of code to their production deployment and debugging. You'll work with the Workers engineering and product teams to build the APIs, Javscript SDKs, and observability features that make building stateful applications on the edge intuitive, reliable, and maybe even a little bit fun. We're looking for a pragmatic, product-minded engineer who is obsessed with developer ergonomics and has felt the pain of deploying complex applications in the cloud. Role Responsibilities Design, build, and maintain the primary developer-facing surfaces for Durable Objects, including our command-line tooling (wrangler), APIs, SDKs, and dashboard. Own the end-to-end developer workflow, from creating intuitive local testing and simulation environments to building powerful debugging and observability tools for a globally distributed system. Act as a technical leader and mentor on the team, driving engineering quality through rigorous code and design reviews. Innovate on solutions to the unique challenges of managing and migrating state at the edge, ensuring developers can deploy with confidence. Collaborate closely with product managers, developer advocates, and support engineers to translate developer feedback into a concrete product roadmap. Author high-quality technical documentation, tutorials, and example applications that inspire developers and accelerate their time-to-production. Triage, investigate, and resolve complex bugs and performance issues reported by the large and growing community of developers building on Durable Objects. Role Requirements Must-Have Skills 5+ years of professional software engineering experience, with a significant portion dedicated to building developer-facing tools, APIs, or cloud infrastructure. Deep, hands-on experience building, deploying, and operating applications on at least one major cloud platform (e.g., AWS, GCP, Azure, or Cloudflare Workers). Strong proficiency in TypeScript/JavaScript and an interest in C++/Rust. A "product-first" mindset and a strong sense of empathy for developers; you get annoyed when tools are hard to use, and you're driven to fix them. Excellent written and verbal communication skills, with the ability to articulate complex distributed systems concepts to a wide range of audiences. A proven track record of taking ownership of complex projects and delivering them from inception to production in a distributed, asynchronous team environment. Nice-to-Have Skills Direct experience building applications with Cloudflare Workers and Durable Objects (we'd love to see what you've built!). Experience with distributed systems concepts, particularly actor-based models (like Erlang/OTP or Akka), consensus algorithms, or distributed databases. Active contributions to open-source developer tools or libraries. 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! 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.