Senior Software Engineer

Description

At the company, we are on a mission to help build a better Internet. The company protects and accelerates any Internet application online without adding hardware, installing software, or changing a line of code. Internet properties powered by the company 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. The company was named to Entrepreneur Magazine’s Top Company Cultures list and ranked among the World’s Most Innovative Companies by Fast Company.

At the company, we’re not looking for people who wait for a polished roadmap; we’re looking for the builders who see the cracks in the Internet that everyone else has simply learned to live with. We value candidates who have the instinct to spot a "normalized" problem and the AI-native curiosity to create a solution using the latest tools. Our culture is built on iteration, leveraging AI to ship faster today to make it better tomorrow, while ensuring that every improvement, no matter how small, is shared across the team to lift everyone up. If you’re the type of person who values curiosity over bureaucracy, and that AI is a partner in solving tough problems to keep the Internet moving forward, you’ll fit right in.

Available Locations: Lisbon, or London (Hybrid)

About the Department

Emerging Technologies & Incubation (ETI) is where new and bold products are built and released within the company. Rather than being constrained by the structures which make the company a hugely successful business, we are able to leverage them to deliver entirely new tools and products to our customers. The company’s edge and network make it possible to solve problems at massive scale and efficiency which would be impossible for almost any other organization.

We build the products that enable the next era of the Internet: making domains Readable , Discoverable , and Callable for autonomous AI agents.

Here at the company, agentic discovery is a core part of our vision for the Agentic Internet . As AI agents change how humans and machines find, evaluate, and act on information, businesses need tools to control how they are represented and reached. We build capabilities that enable website owners to prepare their sites for agent interaction, test and observe how agents read their content, establish open interaction standards (like WebMCP and MCP), and create entirely new channels to reach agentic audiences.

We are a cross functional group that communicates and collaborates regularly. We celebrate our achievements, support each other when we make mistakes, and hold each other and our work to a high standard.

About the Role

We are looking for a Senior Software Engineer to serve as a technical anchor and become a subject matter expert on our Agentic Discovery team. In this role, you will define the architecture, core protocols, and multi-team standards powering the next generation of agent-web interactions.

As a senior technical leader, you will shape product roadmaps, mentor engineers across the company, and write technical specifications that drive execution across multiple teams. You will drive engineering excellence across edge infrastructure, data pipelines, protocol layers, and developer tooling, ensuring systems are resilient and complexity is reduced for your peers.

Responsibilities

• Architect and ship high-throughput, resilient production services that make web properties Readable (structured content transformation), Discoverable (indexing and AEO), and Callable (WebMCP, tool-calling APIs, Generative UI) for autonomous agents.
• Define emerging agent protocols and integrations (MCP, MCP Apps, UCP, MPP, WebMCP). Author architectural specifications and technical designs that guide engineering work both within and outside the ETI team.
• Partner directly with Product Management, customers and stakeholders to translate customer needs into technical requirements, clarify KPIs, and shape engineering roadmaps.
• Drive improvements in system health and observability. Lead complex incident responses, conduct post-incident retrospectives, and rearchitect systems to eliminate failure modes and minimize customer-escalation issues.
• Elevate the engineering process across the company through code reviews, technical mentorship, architectural governance, and candidate evaluation for engineering hiring.
• Desirable Skills, Knowledge, and Experience
• Experience designing scalable system architecture and setting performance metrics in a distributed environment.
• Experience writing technical specifications and leading cross-functional technical initiatives to completion.
• Deep understanding of HTTP, APIs, proxies, caching, web security, and performance bottlenecks spanning multi-service architectures.
• Hands-on experience and deep conceptual understanding of AI agents, tool calling, Model Context Protocol (MCP), or agent harnesses.
• Ability to partner with product managers and customers to navigate ambiguous problem spaces and iteratively deliver large-scale architecture.
• Experience mentoring junior and mid-level engineers, contributing to hiring, and driving improvements to engineering processes and incident response workflows.
• Bonus Points
• Fluency in async Rust or TypeScript/JavaScript edge runtimes (e.g., the company Workers) at scale.
• Active contributions to or leadership in open-source agent frameworks, protocols (e.g., MCP), web standards bodies, browser engines, or network proxies.
• Track record of resolving complex, multi-team production incidents and driving post-mortem recommendations to completion.
• Background in search engines, Answer Engine Optimization (AEO), web crawling at scale, or RAG platform engineering.
• Expertise in cryptographic protocols (public-key encryption, digital signatures) or privacy-preserving web architectures.

Conditions

● 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.

Equity

This role is eligible to participate in the company’s equity plan.

What Makes the company 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.

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 : 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 the company 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!

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 the company Offices or the company Hubs. More details about this will be available at that stage of the interview process.

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.