Senior Software Engineer, Core Experiences

Summary

The Wikimedia Foundation is looking for a Senior Software Engineer to join the App Growth team within the Core Experiences engineering group.

The App Growth team has a clear and ambitious goal: make the apps the destination for knowledge lovers and grow our active readership. As a web full stack Senior Software Engineer supporting the Mobile Apps teams you will build features that create natural handoffs from the web to the app and landing users in exactly the right place — for example, prompting a reader to try a personalized reading list in the app, creating a game that is integrated within the apps as a webview; or when someone tries to edit there is a smooth hand off to the web editing experience.

This is not a native iOS or Android role. The role is focused on web-first product experiences, APIs, and platform integrations that can be reused across mobile web and native app surfaces; to help us scale features across platforms and create compelling features that deepen reader engagement and increase user retention.

Important: We are a fully remote team at a global organisation. To ensure there are enough opportunities to communicate, this role needs at least four hours of your work day to occur between 14:00 UTC and 21:00 UTC.

You are responsible for:

Delivery and enablement - Consistently leads the team in the delivery of medium complexity initiatives (with support) from technical discovery through delivery. Breaks down initiatives into features, drive estimation and manage scope. Identifies risks early, and helps the team make pragmatic tradeoffs across quality, velocity, maintainability, and user impact.
Frontend Implementation - Improving the mobile Wikipedia product experiences that serve a global, multilingual audience across web and app surfaces. Leads system design for medium-sized projects and can design and build accessible, adaptable, scalable components.
Backend Implementation - Takes ownership of creating RESTful APIs, from schema and contract design through to monitoring and iteration, to serve simple but scalable data pipelines to mobile and web client experiences at scale. Ensures pipelines and APIs remain simple to consume, reliable to operate, and straightforward to evolve over time.
Quality, testing and observability - Consistently builds and improves systems & software that is easy to test, observe and debug. Instruments features that enable deeper analysis by Product Analysts.
Cross-functional collaboration - Partners with product managers, designers, analysts, and native app engineers to shape pragmatic solutions that balance user needs, technical constraints, platform expectations, and delivery timelines.
Prioritisation - Proactively identifies high-impact technical opportunities and risks across a quarter, partners with the team to shape priorities and sequencing. Actively keeps the team aligned on outcomes, capacity, and shared goals.
Mentorship - Actively supports the growth and success of others. Mentors engineers through thoughtful code review, technical design, pairing, delegation of meaningful ownership, and modeling strong engineering judgment. Encourage team mates to ask questions and raise concerns.
Culture and standards - Raises team standards in code review, technical design, testing, documentation, accessibility, observability, and decision-making - fostering transparency, empathy, and collaboration.
Operational Awareness - Plans work with awareness of downstream or upstream effects. Actively supports hiring and onboarding.

Qualities that are important to us:

Clear communicator - You can explain your ideas simply and adapt your communication to different audiences across engineering, product, and non-technical audiences in both synchronous and asynchronous channels.
Autonomy - Operates with high autonomy in a team setting and builds autonomy in cross-team settings. You own your work end-to-end and help establish a culture of responsibility and follow-through.
Feedback - You create a feedback-friendly environment. Models giving and receiving feedback with curiosity and empathy. Helps others resolve misunderstandings productively.
Builds strong relationships - Proactively brings the right people into discussions, identifies process improvements, and facilitates team ceremonies.
Comfortable with ambiguity - You are comfortable with ambiguity and can collaborate to solve complex problems with pragmatic solutions. Connects ideas and can regularly balance trade-offs across related domains to create well-rounded solutions.
Knowledge sharing - Strengthens team knowledge-sharing practices and consistently helps others understand and apply shared knowledge. You enjoy working with others to solve problems and are open to feedback. You inspire trust and progress through support, example, and thoughtful contributions.
Outcome-oriented - You prioritise work that delivers value to users and aligns with organizational goals.You balance ideal solutions with the constraints of legacy, user expectations and delivery needs.

Requirements:

Bachelor's and 5+ years related professional experience with significant experience building production web applications and services
Strong professional experience with JavaScript/TypeScript, Javascript frameworks such as Vue.js or React, and at least one backend language such as PHP, Python, Java, Go, or similar.
Experience building responsive or mobile-first web experiences, with attention to performance, accessibility, and usability.
Experience in designing and integrating with server-side APIs.
Experience working in a self-driven, lean environment
Commitment to the Foundation's Mission and Values.

Additionally, we would love it if you have:

Experience adding webview-wrapped experiences to existing native mobile apps (iOS or Android).
Experience in launching and maintaining native or cross-platform mobile applications (iOS or Android)
Experience building mobile games or other interactive mobile experiences.
Experience with data science, machine learning, and/or AI (e.g., familiarity with prompt engineering, Jupyter notebooks experience, etc.)
Familiarity with Wikipedia / wikitext / markdown editing or content management systems (e.g., MediaWiki, Drupal, WordPress).
Experience with leveraging agentic coding to scale the work of small engineering teams.
Bachelor's, master's, or doctorate degree in computer science, management information systems, or STEM field (or equivalent certification)
Prior experience with MediaWiki or Wikimedia projects;
A history of open source contributions
Experience working in a fully remote, distributed team.

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.

As an equal opportunity employer, the Wikimedia Foundation values having a diverse workforce and continuously strives to maintain an inclusive and equitable workplace. We encourage people with a diverse range of backgrounds to apply. We do not discriminate against any person based upon their race, traits historically associated with race, religion, color, national origin, sex, pregnancy or related medical conditions, parental status, sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, genetic information, or any other legally protected characteristics.

The Wikimedia Foundation is a remote-first organization with staff members including contractors based 40+ countries*. Salaries at the Wikimedia Foundation are set in a way that is competitive, equitable, and consistent with our values and culture. The anticipated annual pay range of this position for applicants based within the United States is US$113,082 to US$175,725 with multiple individualized factors, including cost of living in the location, being the determinants of the offered pay. For applicants located outside of the US, the pay range will be adjusted to the country of hire. We neither ask for nor take into consideration the salary history of applicants. The compensation for a successful applicant will be based on their skills, experience and location.

*Please note that we are currently able to hire in the following:
US States: Arizona, California, Colorado, Connecticut, District of Columbia*, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Maryland, Massachusetts, Michigan, Minnesota, Missouri, New Jersey, New Mexico, New York, North Carolina, Ohio, Oklahoma, Oregon, Pennsylvania, Puerto Rico*, Rhode Island, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin and Wyoming (*US Territory or Federal District)

Countries: Brazil, Canada, Colombia, France, Germany, Ghana, India, Indonesia, Italy, Kenya*, Mexico, Morocco, Netherlands, Poland, Singapore*, South Africa, Spain, Switzerland and the United Kingdom. Our non-US employees are hired through a local third party Employer of Record (EOR) and must have current work authorization in their location. (*citizens/permanent residents only)

We periodically review this list to streamline to ensure alignment with our hiring requirements.

All applicants can reach out to their recruiter to understand more about the specific pay range for their location during the interview process.

If you are a qualified applicant requiring assistance or an accommodation to complete any step of the application process due to a disability, you may contact us at recruiting@wikimedia.org or +1 (415) 839-6885.

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