15h Left: Software Engineer - London

CloudFlare
London
1 day ago
Create job alert

At Cloudflare, we are on a mission to help build abetter Internet. Today the company runs one of the world’s largestnetworks that powers millions of websites and other Internetproperties for customers ranging from individual bloggers to SMBsto Fortune 500 companies. Cloudflare protects and accelerates anyInternet application online without adding hardware, installingsoftware, or changing a line of code. Internet properties poweredby Cloudflare all have web traffic routed through its intelligentglobal network, which gets smarter with every request. As a result,they see significant improvement in performance and a decrease inspam and other attacks. Cloudflare was named to EntrepreneurMagazine’s Top Company Cultures list and ranked among the World’sMost Innovative Companies by Fast Company. We realize people do notfit into neat boxes. We are looking for curious and empatheticindividuals who are committed to developing themselves and learningnew skills, and we are ready to help you do that. We cannotcomplete our mission without building a diverse and inclusive team.We hire the best people based on an evaluation of their potentialand support them throughout their time at Cloudflare. Come join us!Software Engineer, All Levels Hiring Process & Cloudflare'sEngineering Teams If you want to build things at Cloudflare but areunsure about which team to apply for, this role will give you thebest opportunity to match with a team that is most aligned to yourexperience, skill, and ambition. We've created a hiring processdesigned to find great candidates and figure out where they fitbest as we go along. At the end of the hiring process you will havethe opportunity to meet with one or more teams to find out if thereis a fit, but if you discover during the interview process that aparticular team or product area is interesting to you let us know.About Engineering at Cloudflare Cloudflare’s Engineers build andoperate the software that helps power 25+ million Internetproperties and millions of businesses around the world. Across ourengineering organizations, we have opportunities for high caliber,curious and empathetic people to take on big challenges and buildsome of the best skills in the industry. We’re looking for talentedteam members to help build high-growth products, help scale ourexpanding network, build tools to improve availability,performance, uptime, and response times, and make systemsfailure-resistant and ready-to-scale. Cloudflare is a systemspanning the globe, on a mission to make the Internet better,safer, and more powerful every day. As a Software Engineer atCloudflare, you’ll work on the code that runs close to the enduser, runs at a massive scale, and is deployed to 330+ citiesaround the world. Examples of software systems at Cloudflare: Sincewe don't know what team you'll be working on quite yet, here's somethings that we do at Cloudflare. This is not a complete list, butgives a good indication of the wide variety of things you mightwork on. - A TLS/HTTP proxy to make the connection from eyeball toedge as fast and secure as possible - Filtering malicious trafficand handling good traffic according to customer configuration -Content optimization that takes content served from customer sitesand makes it more performant - A platform that runs “serverless”Workers and provides a key value store - A reverse-proxy systemthat caches customer website content according to customerconfiguration - Optimization of connections from Cloudflare to ourcustomers' origin servers to reduce their load and increaseperformance - Our Authoritative DNS server and our public resolver1.1.1.1. - Data Science diving deep into HTTP request data,identifying malicious and fraudulent traffic patterns, and buildingnovel solutions for mitigating such attacks. - Full MachineLearning platform and model development, from feature engineeringto model development to release and monitoring. - One of thebiggest data pipelines in the world, operating at well over 250Mevents per second - We operate some of the fastest, and most widelydistributed services on the Internet. Your work will focus onbuilding robust, secure, and high performance distributed systems.We are a small engineering team operating at a massive scale, sowhat you do will have a huge impact. Requirements for any role Ifyou think some of this list describes you (or what you aspire tobe) we would love to talk to you. While not listed as arequirement, we also want to call out that most roles need theflexibility to be on-call outside of standard working hours toaddress technical issues as needed. - First and foremost curiosityand critical thinking - Experience (and love for) debugging toensure the system works in all cases - Experience with a continuousintegration workflow and using source control (we use git) -Designing and building APIs - Understanding of what it takes tobuild secure systems - Confidence to work in multiple programminglanguages - bonus points for Go and/or Rust Examples of desirableskills, knowledge and experience Some team-specific things we thinkare interesting and want to highlight. - Understanding systems atthe network protocol level, including the differences between whatthe specs say, and what actually happens on the Internet -Optimization of complex solutions - Experience with databases (weuse PostgreSQL and Clickhouse) - Understanding what it takes tobuild and maintain distributed systems - Good Unix knowledge,having submitted patches to Operating Systems a huge plus for someroles - Experience with monitoring, alerting and debugging highvolume production systems - Fluent in analyses of data sets such aslogs - Understanding of security and fraud detection systems WhatMakes 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 ourmission to help build a better Internet is protecting the free andopen Internet. Project Galileo: Since 2014, we've equipped morethan 2,400 journalism and civil society organizations in 111countries with powerful tools to defend themselves against attacksthat would otherwise censor their work, technology already used byCloudflare’s enterprise customers--at no cost. Athenian Project: In2017, we created the Athenian Project to ensure that state andlocal governments have the highest level of protection andreliability for free, so that their constituents have access toelection information and voter registration. Since the project,we've provided services to more than 425 local government electionwebsites in 33 states. 1.1.1.1: We released 1.1.1.1 to help fix thefoundation of the Internet by building a faster, more secure andprivacy-centric public DNS resolver. This is available publicly foreveryone to use - it is the first consumer-focused serviceCloudflare has ever released. Here’s the deal - we don’t storeclient IP addresses never, ever. We will continue to abide by ourprivacy commitment and ensure that no user data is sold toadvertisers or used to target consumers. Sound like something you’dlike to be a part of? We’d love to hear from you! This position mayrequire access to information protected under U.S. export controllaws, including the U.S. Export Administration Regulations. Pleasenote that any offer of employment may be conditioned on yourauthorization to receive software or technology controlled underthese U.S. export laws without sponsorship for an export license.Cloudflare is proud to be an equal opportunity employer. We arecommitted to providing equal employment opportunity for all peopleand place great value in both diversity and inclusiveness. Allqualified applicants will be considered for employment withoutregard 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 carestatus, or any other basis protected by law. We are anAA/Veterans/Disabled Employer. Cloudflare provides reasonableaccommodations to qualified individuals with disabilities. Pleasetell us if you require a reasonable accommodation to apply for ajob. Examples of reasonable accommodations include, but are notlimited to, changing the application process, providing documentsin an alternate format, using a sign language interpreter, or usingspecialized equipment. If you require a reasonable accommodation toapply for a job, please contact us via e-mail at via mail at 101 Townsend St. San Francisco, CA 94107. Apply forthis job * indicates a required field First Name * Last Name *Preferred First Name Email * Phone Resume/CV Enter manuallyAccepted file types: pdf, doc, docx, txt, rtf Enter manuallyAccepted file types: pdf, doc, docx, txt, rtf LinkedIn ProfileWebsite This position follows a hybrid work model, requiring atleast two days per week in our Lisbon or London office. Are youable to commit to this schedule if offered the position? *Select... Are you currently located (or willing to relocate to)within 30miles/50km of Lisbon or London? * Select... This job postis for positions in the EMEA region. Please confirm if you have theright to work in Portugal and/or UK? * Select...#J-18808-Ljbffr

Related Jobs

View all jobs

▷ [15h Left] Manager, Software Development, TransportationFinancial Systems

(15h Left) Gov Bonds Quant Trader

AI Trainer for Norwegian Writers/Speakers (College DegreeRequired) (15h Left)

Get the latest insights and jobs direct. Sign up for our newsletter.

By subscribing you agree to our privacy policy and terms of service.

Industry Insights

Discover insightful articles, industry insights, expert tips, and curated resources.

Machine‑Learning Jobs for Non‑Technical Professionals: Where Do You Fit In?

The Model Needs More Than Math When ChatGPT went viral and London start‑ups raised seed rounds around “foundation models,” many professionals asked, “Do I need to learn PyTorch to work in machine learning?” The answer is no. According to the Turing Institute’s UK ML Industry Survey 2024, 39 % of advertised ML roles focus on strategy, compliance, product or operations rather than writing code. As models move from proof‑of‑concept to production, demand surges for specialists who translate algorithms into business value, manage risk and drive adoption. This guide reveals the fastest‑growing non‑coding ML roles, the transferable skills you may already have, real transition stories and a 90‑day action plan—no gradient descent necessary.

Quantexa Machine‑Learning Jobs in 2025: Your Complete UK Guide to Joining the Decision‑Intelligence Revolution

Money‑laundering rings, sanctioned entities, synthetic identities—complex risks hide in plain sight inside data. Quantexa, a London‑born scale‑up now valued at US $2.2 bn (Series F, August 2024), solves that problem with contextual decision‑intelligence (DI): graph analytics, entity resolution and machine learning stitched into a single platform. Banks, insurers, telecoms and governments from HSBC to HMRC use Quantexa to spot fraud, combat financial crime and optimise customer engagement. With the launch of Quantexa AI Studio in February 2025—bringing generative AI co‑pilots and large‑scale Graph Neural Networks (GNNs) to the platform—the company is hiring at record pace. The Quantexa careers portal lists 450+ open roles worldwide, over 220 in the UK across data science, software engineering, ML Ops and client delivery. Whether you are a graduate data scientist fluent in Python, a Scala veteran who loves Spark or a solutions architect who can turn messy data into knowledge graphs, this guide explains how to land a Quantexa machine‑learning job in 2025.

Machine Learning vs. Deep Learning vs. MLOps Jobs: Which Path Should You Choose?

Machine Learning (ML) continues to transform how businesses operate, from personalised product recommendations to automated fraud detection. As ML adoption accelerates in nearly every industry—finance, healthcare, retail, automotive, and beyond—the demand for professionals with specialised ML skills is surging. Yet as you browse Machine Learning jobs on www.machinelearningjobs.co.uk, you may encounter multiple sub-disciplines, such as Deep Learning and MLOps. Each of these fields offers unique challenges, requires a distinct skill set, and can lead to a rewarding career path. So how do Machine Learning, Deep Learning, and MLOps differ? And which area best aligns with your talents and aspirations? This comprehensive guide will define each field, highlight overlaps and differences, discuss salary ranges and typical responsibilities, and explore real-world examples. By the end, you’ll have a clearer vision of which career track suits you—whether you prefer building foundational ML models, pushing the boundaries of neural network performance, or orchestrating robust ML pipelines at scale.