Senior Oracle DBA (ExaCC / Exadata) — Freelance — Lisbon, Portugal (Hybrid)
We're looking for a Senior Oracle DBA to join a freelance project via Shakers, a European tech talent marketplace. This is a specialist, optimization-focused role — day-to-day operational coverage is handled in partnership with infrastructure teams, so the focus here is performance tuning, resource efficiency, and cross-team collaboration. What you'll do: Optimize Oracle performance via compression, query tuning, and indexing — with a focus on ExaCC CPU efficiency, storage cost, and I/O Fine-tune Oracle CPU allocation algorithms on ExaCC to maximize used/allocated ratio Optimize backup and recovery on Oracle ZFS and ZDLRA appliances Lead projects including Kerberos authentication migration and Oracle Client upgrades Guide development teams on database design, SQL, and scalability best practices Perform root cause analysis on performance incidents escalated from infrastructure partners Enforce access management, TDE encryption, auditing, and audit-quality documentation Contribute to multi-platform environments (Azure SQL, PostgreSQL, Synapse) where relevant What you'll need: 5-10 years of hands-on production experience with Oracle databases Proven expertise in performance tuning, compression, and resource optimization Solid experience with Oracle RAC, Data Guard, RMAN, and OEM — must SQL and PL/SQL scripting — must Linux/Unix OS knowledge (primary), Windows (secondary) Professional English, C1 spoken and written — mandatory EU/Schengen nationality or valid Portuguese work permit Nice to have: Hands-on ExaCC/ZFS/ZDLRA, Azure SQL/PostgreSQL/Synapse/DB2, OCP certification, French and/or Dutch, regulated-environment experience (financial services), Jenkins/UCD/Qlik Replicate/Git/ServiceNow/Jira/DBeaver. Location: Lisbon, Portugal — hybrid. Engagement: Freelance, through Shakers.
Senior Oracle DBA — Lisbon, Portugal (Hybrid) • Lisbon, Portugal
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