Senior Software Engineer (Security)

About the Wikimedia Foundation The Wikimedia Foundation is the nonprofit organization that operates Wikipedia and the other Wikimedia free knowledge projects.

Wikimedia Foundation

Employee count: 501-1000

Salary: 113k-176k USD

United States only

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The Wikimedia Foundation is looking for a Senior Software Engineer to join the Product Safety and Integrity team and build new security features to protect Wikipedia and our other projects.

Requirements

5+ years of experience as a software engineer, ideally with focus on security
Ability to work effectively in a modern PHP and JavaScript codebase
Driving technical quality and operational excellence by defining and reinforcing standards in testing, observability, and system reliability
Experience in developing secure software or security-related product features
A strong interest in working with a talented security team and learning more specialist security skills such as exploiting and mitigating application-level vulnerabilities
Ability to explain complex security issues and their implications on privacy and risk to non-technical audiences
Sensitivity to the security challenges faced by participants in a large, international project
Experience working in a remote, distributed team

Benefits

Generous Paid Time Off
401k Matching
Retirement Plan
Relocation Assistance

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About the job

Apply before

Jan 05, 2026

Posted on

Nov 06, 2025

Job type

Full Time

Experience level

Senior

Salary

Salary: 113k-176k USD

Location requirements

United States

Hiring timezones

United States +/- 0 hours

Job categories

Senior Security Engineer Senior Cloud Security Software Engineer Security Software Engineer Senior Cybersecurity Engineer Senior Software Engineer Senior Software Engineer Jobs Sr. Software Engineer Senior Network Security Engineer Senior Security Operations Engineer Security Engineer

Skills

PHP JavaScript & Security Software Security Observability Testing

About Wikimedia Foundation

Learn more about Wikimedia Foundation and their company culture.

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About the Wikimedia Foundation

The Wikimedia Foundation is the nonprofit organization that operates Wikipedia and the other Wikimedia free knowledge projects. Our vision is a world in which every single human can freely share in the sum of all knowledge. We believe that everyone has the potential to contribute something to our shared knowledge, and that everyone should be able to access that knowledge freely. We host Wikipedia and the Wikimedia projects, build software experiences for reading, contributing, and sharing Wikimedia content, support the volunteer communities and partners who make Wikimedia possible, and advocate for policies that enable Wikimedia and free knowledge to thrive.

The Wikimedia Foundation is a charitable, not-for-profit organization that relies on donations. We receive donations from millions of individuals around the world, with an average donation of about $15. We also receive donations through institutional grants and gifts. The Wikimedia Foundation is a United States 501(c)(3) tax-exempt organization with offices in San Francisco, California, USA.

Tech stack

Learn about the tools and technologies that Wikimedia Foundation uses to build, market, and sell its products.

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JavaScript

Python

HTML5

Java

CSS 3

PHP

Swift

Debian

GraphQL

GitHub

30 more

Wikimedia Foundation employees can create an account to update this tech stack.

Employee benefits

Learn about the employee benefits and perks provided at Wikimedia Foundation.

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Life insurance

Life insurance at 2X salary.

Disability insurance

Long and short term disability.

Employee assistance program (EAP)

We offer an employee assistance program focused on mental health.

Retirement benefits

401(k) retirement plan with matched contributions up to 4% of annual salary.

View Wikimedia Foundation's employee benefits

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Please let Wikimedia Foundation know you found this job on Himalayas. This helps us grow!

Apply now