Senior Database Solution Architect (Oracle)

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Senior Database Solution Architect (Oracle) | Quality & Reliability (QnR), the parent company of QnR Group

Role overview

We are looking for a Senior Database Solution Architect to join the Back End team of Quality & Reliability (QnR). You will own the Oracle databases of large public-sector information systems, from the data model to the production cutover. The work covers data migration from legacy systems, PL/SQL and Oracle APEX development, and moving databases to Oracle Cloud Infrastructure. Developers, partners and clients will come to you for every database decision.

About QnR Group

QnR Group is a technology group with 35 years of experience, 8 companies, 4 delivery centers and 225 professionals across Greece, Belgium, Cyprus and Poland. Listed on the Athens Stock Exchange since 2000, we deliver mission-critical digital transformation projects for the public and private sector. The Group’s capabilities cover software engineering, enterprise and generative AI, cybersecurity, cloud infrastructure, SAP and ServiceNow solutions, core banking and maritime intelligence.

Requirements

What you'll work on:

• Database design: Design logical and physical data models for new information systems and set the standards for naming, auditing, multi-tenancy and row-level security
• Data migration: Lead migrations from legacy systems (Oracle 11g/12c, SQL Server, older ERPs) to target Oracle or PostgreSQL databases. Own data migration from the mapping study to the production cutover: PL/SQL load packages, stage syncs, reconciliation and character-set conversion
• PL/SQL & Oracle APEX: Build packages, views and reporting procedures, administer APEX instances and workspaces, and integrate them with external systems, identity providers and third-party services through RESTful APIs
• Oracle Cloud: Move schemas to OCI Autonomous Database (ATP/ADW) and other clouds with Data Pump, and set up DB links, wallets and network ACLs together with our System Architect team
• BI & ETL: Design data warehouses and ETL with Oracle Data Integrator, and build reports in BI Publisher and Oracle Analytics Cloud
• Performance: Read execution plans, rewrite queries and design indexes on tables with hundreds of millions of rows
• Technical leadership: Guide developers and external partners, for example on Oracle Forms to APEX modernisation, review database code and estimate the database work of new projects
• Client delivery: Present technical designs to public-sector clients and write the database chapters of project deliverables: system design, data migration plan, technical manuals
• Support: Act as third-level support for database, APEX and ORDS incidents in productions

What you bring:

• Bachelor’s degree in Computer Science, Computer Engineering or a related field, or equivalent professional experience
• 7+ years of hands-on experience with Oracle Database, SQL and PL/SQL on production systems
• Proven experience designing databases for large OLTP systems
• At least two end-to-end data migrations from legacy systems, from analysis to production
• Strong performance tuning skills: execution plans, indexing, AWR / SQL Monitor
• Experience with Oracle APEX and/or ORDS
• Fluent Greek, as deliverables for our Greek public-sector clients are written in Greek, and very good English
• Clear communication with developers and clients, and the habit of documenting your work

Nice to have:

• Oracle Cloud Infrastructure: Autonomous Database, Data Pump, cloud migrations
• Oracle Data Integrator, BI Publisher or Oracle Analytics Cloud
• Oracle Forms/Reports to APEX modernisation
• Oracle ADF / WebLogic
• SQL Server or PostgreSQL (PL/pgSQL)
• Python for data-loading tools
• LDAP, Active Directory or Entra ID integration, REST and OAuth
• Oracle certifications (OCP, APEX Developer Professional, OCI)
• Public-sector projects and tender deliverables