The Wikimedia Foundation is seeking a Senior DBA. Our objective is to make the sum of all human knowledge available to everyone, and we persist most of this knowledge in MariaDB. Our project sites are some of the most highly visited on the internet, with more page views per engineer than any other site.

As a Senior DBA at the Wikimedia Foundation, you will be part of a small, focused team of skilled and experienced engineers. In this role, you will be responsible for ensuring the health of our database systems - including their availability and performance. 

Your responsibilities will include troubleshooting issues, database maintenance, performance tuning, high availability, replication, backups, and general optimization as well as benchmarking and testing new MariaDB and MySQL builds.

WMF is a proponent of privacy and using free and open-source software. We run a large database cluster with MariaDB on bare metal Linux hosts.

The work we do is crucial and is used by hundreds of millions of people. This is a unique opportunity to make a huge impact for a good cause.

The candidate should be open to travel 1-2 times a year.

Responsibilities

• Implementation, maintenance and troubleshooting of relational database systems in production and staging environments

• Handling database version upgrades, testing and working with upstream on bug identification and resolution

• Configuring replication, designing schema optimizations and running schema changes

• Monitoring, debugging and improving query performance

• Improving observability (alerting, metrics, monitoring) of database infrastructure

• Multi-datacenter replication topology design, capacity and infrastructure planning

• Taking part in incident response, diagnosis and follow-up on system outages or alerts across Wikimedia’s production infrastructure and participating in an on call rotation

• Sharing our values and work in accordance with them

Qualifications

• Advanced level of experience with MariaDB or MySQL database administration as the primary production database as well as replication topologies at scale

• Knowledge of Linux and IO/data storage concepts, internals and troubleshooting (we run Linux in production exclusively)

• Proficiency in SQL

• Experience with debugging query performance and schema design

• Experience with MySQL high availability and replication management tooling

• Experience with remotely managing bare-metal servers

• 5+ years experience in a hands-on DBA role as part of a team

• Experience with high traffic and highly available website architectures and operations

• Strong English language skills

• Ability to work independently in a fast paced environment, as an effective part of a globally distributed team, including ticket tracking systems and asynchronous communication tools

• B.Sc. or M.Sc. in Computer Science or equivalent work experience

Optional qualifications

• Proficient at automation/programming/scripting skills

• Experience with LAMP stack technologies (PHP/HHVM, memcached/Redis) - MediaWiki experience is a definite plus

• Experience with advanced distributed storage and database systems (Swift, Ceph, Cassandra, etc.) is a big plus

• Experience in architecture, design, and implementation of persistent data storage & query infrastructure

• Strong track record of open source contributions is a major plus