Senior Software Engineer

We are looking for a Senior Software Engineer to serve as an expert and technical leader on our Agentic Commerce team. In this role, you will define the architecture, build core systems, and establish technical standards powering machine-to-machine payments, metering, and monetization across Cloudflare's network. As a Senior Engineer, your impact extends beyond individual features. You will shape product and engineering roadmaps by partnering directly with customers, product managers, and across Cloudflare teams. You will write architectural specs that guide engineers inside and outside the team, build systems that reduce complexity for others, and lead complex incident responses. You will be a prime reviewer for large systems, define core product KPIs, and mentor engineers across the organization to elevate our collective engineering practice.

• Design and build resilient, low-latency systems and core architectures that make web resources Payable for autonomous agents using emerging protocols (x402, WBA, ACP, UCP).
• Write technical specs (RFCs) and architecture designs that encompass deliverables for developers both within the team and across other Cloudflare engineering groups.
• Meet directly with customers and Product Management to clarify requirements, define actionable KPIs, and translate business needs into scalable architectural solutions.
• Architect services to reduce code complexity for the team, ensure seamless recovery from internal and external failures, and improve overall system health observability.
• Lead complex incident responses, retrospectives, and root-cause analyses while driving initiatives that proactively prevent customer escalations and reduce system alerts.
• Debug and resolve high-complexity issues spanning multiple teams, services, and protocols, using these opportunities to teach others how to handle similar challenges.
• Actively mentor engineers, improve engineering and interviewing processes, conduct high-impact spec and code reviews, and share knowledge through technical talks and writings.

• Deep software engineering and distributed systems expertise with a track record of architecting, building, and operating high-throughput, low-latency production services.
• Broad experience with HTTP, API design, payment protocols/rails, web security, and cryptographic authorization mechanisms.
• Demonstrated experience defining product KPIs and translating complex customer and product requirements into clear architectural roadmaps.
• Proven track record of debugging complex distributed system failures that span multiple teams and systems, with a focus on systemic remediation.
• Strong history of technical mentorship, leading incident retrospectives, and driving process improvements inside and outside your immediate team.
• Ability to rapidly prototype, evaluate deep architectural trade-offs, and establish design patterns in an emerging technical domain.
• Excellent technical writing and communication skills, with experience drafting RFCs and specifications consumed by multiple engineering organizations.

• Fluency in Rust (especially async Rust) or TypeScript/JavaScript edge runtimes (e.g., Cloudflare Workers, Durable Objects, KV) at system-architectural scale.
• Deep knowledge of emerging agentic payment protocols (x402, A2P, ACP, UCP, Web Bot Auth) or digital wallet architectures.
• Experience architecting high-precision event metering pipelines, usage-based billing engines, outcome verification systems, or revenue attribution tools.
• Experience with smart contract bridges, cryptography (public-key encryption, signatures, hashes), or hybrid fiat/crypto payment infrastructure.
• Active contributions to open-source payment systems, agent protocols, web standards, or distributed systems projects.
• Experience training interviewers, closing candidates, or guiding company-wide technical standards.

For Portugal based hires: Estimated annual salary is between €66,000 - €91,000. The final offer will be inclusive of time exemption, in alignment with the applicable law and collective bargaining agreements. This role is eligible to participate in Cloudflare’s equity plan.

Cloudflare 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. Cloudflare was named to Entrepreneur Magazine’s Top Company Cultures list and ranked among the World’s Most Innovative Companies by Fast Company.

Apply through the provided link. 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. This position may require access to information protected under U.S. export control laws, including the U.S. Export Administration Regulations. 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.