Senior Software Engineer, Cloudflare
Quicksilver - Distributed Key Value
Web performance and security platform
Job no longer available
Web performance and security platform
1001+ employees
Job no longer available
1001+ employees
Company mission
To help build a better Internet that is bold and ambitious.
Role
Who you are
- If working at this scale excites you and you are intrigued by very tricky bugs, rather than being scared by them, you might be a match for this role
- You have previous experience writing robust systems, code quality, performance and technical debt. You understand the tradeoffs that doing rigorous engineering requires
- You have proven experience with storage systems, peer to peer systems, large scale distributed systems or simply system programming in general
- You have previous experience of chasing problems through multiple layers of our software stack. You can be flexible and you are very curious
- You are flexible and very autonomous. You won’t be micromanaged in this role and will be looked to have experience thinking out of the box and coming up with simple and smart designs for complex issues
- You have a previous track record of being pragmatic and believe in the value of simple solutions
- You equally enjoy low-level and high-level programming. You have a taste for programming languages
- You enjoy being a part of a team that challenges each other's designs -- you are good at taking and giving constructive criticism with a goal of producing the best solution
- You are not afraid of engaging in outages on anti-social hours
What the job involves
- In this role, you can expect to see challenges like unexpected network issues, hardware failures, kernel bugs and still have to deliver the data to the edge in a fast and reliable way
- Along with the rest of the team, you will own and support the whole stack: the code base, the unit and integration test, deployment and rollback plans, operations, monitoring, alerting, debugging and on-call
- Quicksilver is written in Go and C
- Your daily duties will be:
- Working on our distributed large scale key-value store, you will write new features in Go and reviewing pull request
- Improving performance, CPU, memory usage, etc
- Improving our monitoring and our tools, all written in Go
- Help with debugging and investigating hard to reproduce problems
Our take
Cloudflare is a multi-service global network that provides web security and infrastructure, DDoS mitigation services, and a content delivery network. Founded in 2009, Cloudflare has risen to become an industry giant, with over 25 million global internet properties on its network.
Cloudflare has been responsible for a number of admirable initiatives, offering free web protection to human rights groups, journalists, artists, and US election websites. This goes some way to counteracting the flak Cloudflare has received in some circles for the controversial groups and users who use its services. This chequered history, however, has not affected its over 80% market share in the content delivery network field.
This is perhaps in part because it has proven sharp at staying abreast of the rapidly morphing tech and digital space and customer demands. For example, Cloudflare is shifting to 100% renewable energy usage to create a zero-emissions internet, and in 2020 released a feature that would help users navigate data privacy regulations by selecting where their data is stored.
And impressive third-quarter 2025 results show strong momentum, with revenue rising to $562 million from $430 million a year earlier. The company also raised its full-year guidance, underscoring confidence in continued growth. As demand for secure, cloud-based infrastructure keeps growing, Cloudflare's expanding platform and improving efficiency leave it well positioned to capture further gains in a rapidly growing market.
Steph
Company Specialist at Welcome to the Jungle
Insights
16% employee growth in 12 months
Company
Company benefits
- Take-what-you-need vacation: We encourage employees to find a comfortable work-life balance by taking as many days off as they need while still being able to perform their jobs satisfactorily. (We really mean it!)
- Paid maternity & paternity leave: Our global parental leave policy allows up to sixteen paid weeks of bonding leave time for all qualifying new parents.
- Employee benefits: We offer a comprehensive benefits package including healthcare, life insurance, short- and long-term disability, pension plans in accordance with the market practice in our locations.
- Commuter program: We are flexible about where we work and value connecting at the office. Our commuter benefits program is in place to support team members' commute to work via public transportation without the extra cost burden.
- Wellbeing: Global offerings that provide mental health, childcare and family forming support to our employees across our offices.
Company HQ
China Basin, San Francisco, CA
Leadership
Lee Holloway
(Co-Founder & Lead Engineer)Lee began their career as an Engineer at Homewarehouse for a year before working at Unspam Technologies for 4 years. They co-created Project Honey Pot in 2004 and Cloudflare in March 2009, serving as Lead Engineer of both to present.
Michelle Zatlyn
(Co-Founder, President & Co-Chair)Having worked for Investor Economics and I Love Rewards for a combined 4 years, Michelle worked at Toshiba for 3 years as a Product Manager. She then co-founded Cloudflare in 2009 as COO, and has served as President since 2020. She is also a Board Member at Atlassian.
Matthew Prince
(Co-Founder & CEO)Matthew studied for an MBA at Harvard Business School before co-founding Unspam Technologies in December 2001, and Cloudflare in 2009, where he has served as CEO ever since.
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