Systems Engineer & Traffic Management

Cloudflare; Greater London; On-site; GBP 60,000 - 80,000; Full time

Job summary

A leading internet security company is seeking a Systems Engineer to join their Traffic Management team in London. You will be responsible for building and maintaining systems that optimize traffic routes across their global network. Ideal candidates have at least 2 years of engineering experience, strong skills in networking protocols, and expertise in Go, Python, or Rust. The position includes participation in an on-call rotation and offers a range of health, financial, and time-off benefits.

Benefits

Medical/Rx Insurance

Flexible Spending Accounts

401(k) Retirement Savings Plan

Flexible paid time off

Qualifications

• Minimum of 2 years of engineering experience with networking and/or distributed systems.
• Systems-level programming experience in Go, Python, Rust, C, or C++.
• Knowledge/interest in HTTP, TLS, and CDN networks.
• Strong collaboration and communication skills.

Responsibilities

• Build and extend various traffic management and supporting systems.
• Collaborate on initiatives to use Cloudflare’s global network.
• Participate in all stages of the software development lifecycle.

Skills

Networking protocols

Distributed systems

Collaboration skills

Programming in Go

Programming in Python

Programming in Rust

Tools

Kubernetes

PostgreSQL

ClickHouse

Prometheus

Job description

Position Title: Systems Engineer - Traffic Management

Available Locations: London, UK or Lisbon, Portugal

Role Summary

The Traffic Management team is responsible for the systems that dynamically route traffic flows into, through, and from Cloudflare's global network. We manage traffic for numerous products and millions of customers, from individual websites to major enterprises. This team is at the heart of Cloudflare’s mission to make the internet faster, safer, and more reliable.

Role Responsibilities

As a member of the team you will build and extend various traffic management and supporting systems. You will work closely with Network Engineering, Product Engineering, Network Strategy, and other teams to collaborate on ambitious initiatives to make the best use of Cloudflare’s global network.

You will participate in all stages of the software development lifecycle: from designing and documenting systems, to writing code and automated tests, to planning, managing, and monitoring production software deployments. You will work with a wide range of technologies and programming languages, including Go, Python, Rust, eBPF, ClickHouse, Salt, PostgreSQL, Prometheus, Kubernetes, and more.

Our team at Cloudflare operates under a "Run What You Build" model. This means we are responsible for the health of our systems and actively participate in our team's on-call rotation as part of our operational duties.

Because you’ll be solving problems of massive scale and significance, and shaping the future of reliability and performance on the Internet, you are a growth‑oriented individual who enjoys being outside of your comfort zone. You are comfortable in a fast‑paced but sensible work environment. You value curiosity and empathy and lead with these values.

Role Requirements

Must-Have Skills

• Minimum of 2 years of engineering experience with networking and/or distributed systems.
• Systems‑level programming experience in Go, Python, Rust, C, or C++.
• A solid grasp of networking protocols in Layers 3 and 4 of the OSI Model.
• Knowledge/interest in HTTP, TLS, and CDN networks.
• Experience/interest in network performance monitoring and tuning.
• Strong collaboration and communication skills.

Bonus Points

• Experience building or developing capabilities in the domain of traffic engineering including automated load balancing and traffic prioritization.
• Knowledge of statistical‑analysis techniques and control theory.
• Knowledge of TCP/IP and Internet routing.
• Experience building tools and APIs.
• Experience with monitoring, alerting, and debugging large‑scale distributed systems.
• Experience participating in an on‑call rotation.

Equity

This role is eligible to participate in Cloudflare's equity plan.

Benefits

Cloudflare offers a complete package of benefits and programs to support you and your family. Our benefits programs can help you pay health care expenses, support caregiving, build capital for the future and make life a little easier and fun! The below is a description of our benefits for employees in the United States, and benefits may vary for employees based outside the U.S.

Health & Welfare Benefits

• Medical/Rx Insurance
• Dental Insurance
• Vision Insurance
• Flexible Spending Accounts
• Commuter Spending Accounts
• Fertility & Family Forming Benefits
• On‑demand mental health support and Employee Assistance Program
• Global Travel Medical Insurance

Financial Benefits

• Short and Long Term Disability Insurance
• Life & Accident Insurance
• 401(k) Retirement Savings Plan
• Employee Stock Participation Plan

Time Off

• Flexible paid time off covering vacation and sick leave
• Leave programs, including parental, pregnancy health, medical, and bereavement leave

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—you 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 [e-mail] or via mail at 101 Townsend St. San Francisco, CA 94107.