Senior Database Administrator – Oracle (ExaCC / Exadata)

We are searching for candidates for a senior Oracle DBA role focused on performance optimization, resource efficiency and project delivery across Oracle ExaCC (Exadata Cloud@Customer), ZFS and ZDLRA environments. Day-to-day operational coverage is handled in partnership with infrastructure teams; this role focuses on specialist expertise, continuous improvement and cross-team collaboration with development and infrastructure stakeholders. What You'll Do Optimize Oracle database performance through compression techniques, query tuning and indexing strategy — with a focus on ExaCC CPU efficiency, storage cost reduction and I/O efficiency; Fine-tune Oracle CPU allocation algorithms on ExaCC to maximize the used/allocated ratio and minimize waste; Optimize backup and recovery processes for Oracle ZFS and ZDLRA appliances, ensuring reliability and cost-effectiveness; Lead and support key projects, including migration to Kerberos authentication and Oracle Client upgrades; Guide development teams on best practices for database design, SQL coding, performance and scalability; Perform root cause analysis on performance incidents and complex database issues escalated from infrastructure partners; Enforce access management, TDE encryption, auditing controls and audit-quality documentation; Contribute to multi-platform environments (Azure SQL, PostgreSQL, Synapse) where relevant; Collaborate with infrastructure partners, development teams and project stakeholders across initiatives. What You'll Need Qualifications University degree in Computer Science, Engineering or comparable technical field;5-10 years of hands-on experience with Oracle databases in production environments; Proven expertise in performance tuning, compression and resource optimization; Hands-on experience with ExaCC, ZFS and ZDLRA is a strong plus; OS knowledge: Linux and/or Unix (primary), Windows (secondary). Technical Skills Oracle RAC, Data Guard, RMAN, Oracle Enterprise Manager (OEM); SQL and PL/SQL scripting (must);

ExaCC CPU optimization, compression techniques, query tuning, Exadata awareness; Kerberos authentication and Oracle Client upgrades; Transparent Data Encryption (TDE), auditing & compliance controls; Azure SQL or PostgreSQL, Azure Synapse or DB2 — knowledge is a plus; Tools: Oracle SQL Developer, Toad for Oracle, Following Tools are a plus: Jenkins, UrbanCode Deploy, Qlik Replicate, Git/Bitbucket, ServiceNow, Jira, DBeaver; Oracle Certified Professional (OCP) or equivalent certification is a plus. Profile & Other Requirements Professional English C1 (spoken and written) — mandatory; French and/or Dutch is a plus; Strong collaboration skills — comfortable working with infrastructure partners, development teams and non-technical stakeholders; Structured problem-solving mindset; ability to communicate technical findings clearly; Generalizing-specialist profile — open to working across multiple database technologies; Experience in regulated environments (e.g., financial services) is a strong plus; Must own a valid work permit or EU/Schengen Space nationality to legally work in Portugal; Lisbon/Portugal-based — hybrid working model in Parque das Nações.