Senior Software Engineer

Senior Software Engineer
Braga
Braga, Braga, Portugal

Senior Software Engineer

Join to apply for the Senior Software Engineer role at The Carmelite System, Inc.

Summary

The Wikimedia Foundation is seeking a Senior Software Engineer to join the team supporting the Wikidata Platform—the structured data backbone of Wikimedia projects and a key part of the global open‑knowledge ecosystem. You will help scale and sustain the Wikidata Query Service (WDQS) and related platform services that power tools, features, communities, and research efforts across Wikimedia projects and beyond. This role blends backend engineering with operations ownership, implementing high‑scale, production‑grade services while ensuring performance, reliability, and maintainability. Working closely with technical and product leads, you will shape the future of how the world queries and interacts with structured, linked data.

Important

We are a fully remote team. Your working hours will need to overlap with UTC+1 to UTC-5 time zones to accommodate members of your team around the world. Overlap is from 14:00 UTC to 17:00 UTC.

What You’ll Do

• Design, build, and maintain backend systems and APIs that power Wikidata's query infrastructure
• Improve reliability, observability, and automation of the Wikidata Query Service and data pipelines
• Collaborate with SRE, data engineers, and product teams to ensure stability and scalability under growing usage
• Monitor production systems, respond to operational incidents, and proactively identify and resolve bottlenecks
• Support platform migrations and system upgrades (e. g. , triple stores, streaming ingestion)
• Contribute to deployment automation, CI/CD workflows, and service instrumentation
• Participate in code reviews, design discussions, and technical planning
• Document systems and share knowledge with team members and Wikimedia's broader technical community

Skills and Experience We’re Looking For

• 5+ years of experience as a backend or platform engineer working on distributed systems or data platforms
• Deep understanding of database and knowledge‑graph representation technologies and standards
• Proficiency in Java, C++, or other systems languages (ability to scale and investigate systems is more important than expertise in a particular language)
• Experience building and operating production‑grade services with SLOs
• Familiarity with modern observability tools (metrics, logging, tracing)
• Understanding of graph databases, search indexes, or data processing pipelines
• Ability to work collaboratively across disciplines and communicate clearly across technical and non‑technical audiences
• A commitment to learning, resilience, and contributing to a mission‑driven engineering culture

Nice to Have

• Experience working with knowledge graphs or RDF/SPARQL
• Familiarity with streaming data systems (e. g. , Kafka, Flink)
• Comfort with CI/CD pipelines and containerization tools (e. g. , Docker, Kubernetes)
• Experience in open‑source or open‑knowledge communities
• Familiarity with Wikimedia technologies, Wikidata, or Media
  Wiki

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 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 United States 501(c)(3) tax‑exempt organization with offices in San Francisco, California, USA.

Equal‑Opportunity Statement

As an equal‑opportunity employer, the Wikimedia Foundation values 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 race, religion, color, national origin, sex, pregnancy, LGBTQ+ status, gender identity, age, veteran status, disability, genetic information, or any other legally protected characteristic.

Compensation

Salary ranges for the United States: US$141, 352 to US$175, 725 (adjusted by cost of living).

Locations

Countries we are currently hiring in: Australia, Austria, Bangladesh, Belgium, Brazil, Canada, Colombia, Costa Rica, Croatia, Czech Republic, Denmark, Egypt, Estonia, Finland, France, Germany, Ghana, Greece, India, Indonesia, Ireland, Israel, Italy, Kenya, Mexico, Netherlands, Nigeria, Peru, Poland, Singapore, South Africa, Spain, Sweden, Switzerland, Uganda, United Kingdom, United States of America, Uruguay.

Disability Accommodation

We provide accommodations for qualified applicants with disabilities. Contact ****** or ***************** for assistance.