Senior Database Administrator

OnBuy Greater London, England, United Kingdom Senior Database Administrator (DBA) OnBuy is an online marketplace on a mission to be the best choice for every customer, everywhere. We were recently named one of the UK's fastest‑growing tech companies in the Sunday Times 100 Tech list. Working at OnBuy We are a team of driven and motivated people who thrive when working at pace. We need people who take charge, own their responsibilities and get things done. You will be surrounded by opportunity and must stay focused, prioritise ruthlessly, and thrive in an ever‑changing environment as we evolve. About the Role Lead the design, optimisation, operation, and cost‑effective scaling of our GCP data platform. The role will focus on Cloud SQL (MySQL) and BigQuery, with responsibility for performance, reliability, security, automation and observability across transactional and analytical workloads. Key Responsibilities Administer high availability setups in CloudSQL. Performance tuning: indexing, partitioning, query tuning, load balancing and resource sizing. Cost optimisation for Cloud SQL and BigQuery and lifecycle policies. Troubleshoot performance and incidents; lead incident response, MTTR ownership, RCA and continuous improvements. Provide 2nd‑line DBA support: own and resolve escalated database incidents and requests. Backup, restore and disaster recovery: author and practice DR plans, run restore drills, validate backups and enforce retention. Security and compliance: manage IAM/ACLs, encryption (at rest/in transit), secrets management, access reviews and audit logging. Execute database upgrades and change management: plan/coordinate upgrades with rollback plans and compatibility testing. Automate as much as possible: IaC (Terraform/Deployment Manager), CI/CD for schema and infra changes, automated remediation and runbooks. Capacity planning - forecasting growth. Maintaining, monitoring and observability of database solutions; own dashboards, SLOs, logging, metrics and actionable alerts. Cost and resource governance: tagging, quota controls, cost monitoring and chargeback recommendations. Mentoring and documentation: maintain runbooks, knowledge base, and coach engineers on DB best practices. Vendor/third‑party management: manage managed‑service support relationships and SLAs. Requirements Essential Databases: Cloud SQL (MySQL) and BigQuery; strong knowledge of indexing, query plans, schema refactoring and OLTP patterns. Cloud: Production experience with GCP. Scripting & IaC: Terraform; Ansible, Git, Bash. Tooling: Query Insights, SQL Diagnostic Manager, MySQL Workbench tooling. Monitoring & logging: Cloud Monitoring, New Relic or equivalent; database alerting strategy. Security & compliance: IAM, VPC, encryption, secrets management and audit logging. Operational practices: HA/replication, backups, DR, change management and on‑call‑ experience. Communication: Strong documentation, runbook writing and stakeholder collaboration. Desirable NoSQL & Caching: Couchbase operations and Memorystore/Redis experience. Tooling: DataStream, Airbyte, ORM, Laravel. Containers & orchestration: Kubernetes basics where DB tooling/operators are used. Agile and Jira: experience in Agile teams (Scrum/Kanban); create/refine user stories, estimate and prioritise work, and use Jira to manage boards and track progress. Certifications: Google Cloud Professional Data Engineer or Cloud Architect. Benefits The salary on offer for this role is £65,000- £75,000 depending on experience. Company Equity – In return for helping us to grow, we’ll offer you company equity, meaning you own a piece of this business we are all working so hard to build. 25 days annual leave + Bank Holidays. 1 extra day off for your Birthday. Employee Assistance Programme. Perks at Work benefit platform. Opportunities for career development and progression. Our Commitment OnBuy is an equal opportunities employer. We are dedicated to creating a fair and transparent workforce, starting with a recruitment process that does not discriminate on the basis of gender, sexual orientation, marital or civil partnership status, pregnancy or maternity, gender reassignment, race, colour, nationality, ethnic or national origin, religion or belief, disability, or age. Seniority level Mid-Senior level Employment type Full-time Job function Information Technology Industries Technology, Information and Internet #J-18808-Ljbffr