Senior Oracle Application Database Administrator

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.

About the Role

This senior Oracle DBA role is focused on performance optimization, resource efficiency and project delivery across Oracle ExaCC (Exadata Cloud@Customer), ZFS and ZDLRA environments, with an emphasis on specialist expertise, continuous improvement and cross-team collaboration with development and infrastructure stakeholders.

Responsibilities

• 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.

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).

Required 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;
• Tools: Oracle SQL Developer, Toad for Oracle,
• Professional English C1 (spoken and written) — mandatory;
• 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;
• Must own a valid work permit or EU/Schengen Space nationality to legally work in Portugal;
• Lisbon/Portugal-based — hybrid working model.

Preferred Skills

• Following Tools are a plus: Jenkins, UrbanCode Deploy, Qlik Replicate, Git/Bitbucket, ServiceNow, Jira, DBeaver;
• Azure SQL or PostgreSQL, Azure Synapse or DB2 — knowledge is a plus;
• Oracle Certified Professional (OCP) or equivalent certification is a plus.
• Experience in regulated environments (e.g., financial services) is a strong plus;