Database Administrator (MariaDB PostgreSQL)

Company Description

Arηs is a fully independent group of companies specialized in managing complex IT projects and systems for large organisations, focusing on state-of-the-art software development, digital trust, cloud, data science, mobile development, machine learning and infrastructure services.

We are composed of 16 entities across 8 countries worldwide that are unified by the Arηs Group, with more than 2500 consultants. This corporate structure enables us to respond quickly to market changes and customer requests, and to communicate and make decisions without layers of bureaucracy.

Established in 2016, the Greek entity Arηs Developments Hellas aims to extend Arηs Group activities dedicated to the European market providing high-quality services in Software Development, covering the entire application development lifecycle.

Job Description

• Database Administration: performing day-to-day Database Administration tasks for Microsoft SQL Server databases as well as for other DBMSs including MariaDB, PostgreSQL, MongoDB and Cassandra Databases. The following tasks are within the context of these DBMSs:
• Database server deployment: installing, configuring, patching, and upgrading Database servers, Database Management systems, and Databases.
• Virtual server configuration: configuring, patching, and upgrading virtual Servers and operating systems underlying the DBMSs, including Microsoft Windows Server.
• Health monitoring: defining, gathering, and managing metrics for monitoring databases, operating systems and servers to ensure systems remain healthy; checking error logs, system events, database events, disk space and storage events use monitoring tools including SCOM to identify, prevent and resolve issues.
• Security management: Enforce data security and data protection policies by managing security and database access, identifying and auditing user access of sensitive databases in compliance with procedures and regulations.
• Database maintenance: installing, configuring, scheduling, monitoring Database Jobs for Backups, Integrity checks, Index maintenance, Update Statistics, etc.
• Backup and recovery: define, create, and schedule database backup plans and strategy, ensure restorability, integrate Database-level backups with Operating System-level backup systems like NetBackup and manage Data Retention.
• Performance monitoring, tuning, and optimization: define and gather critical performance metrics for DBMSs and OSs to ensure fast database performance using tools like SolarWinds DPA; assess data access patterns and query plans for improving performance by tuning and optimizing database queries.
• Business Continuity: ensure meeting SLAs by configuring High Availability & Disaster Recovery, defining, implementing, configuring, and monitoring technologies including AlwaysOn Availability Groups and Windows Server Failover Clusters.
• Automation: define, implement, schedule, and monitor scripts for the automation of repetitive, recurring tasks using Powershell, and Bash.
• DevOps: define, create, and implement DevOps pipelines for deploying database changes into production using AzureDevops, FlyWay, and Puppet.
• Data modelling: define and update standard operating procedures.
• Change management: implement database Changes and Releases into production and other environments, in compliance with standards and procedures.
• Coordination: Coordinate and/or participate with multiple teams to coordinate activities from Development, Architecture, Applications, Security, Networks, and Service Management in case of troubleshooting and problem resolution.
• Communication: communicate opposing views to stakeholders and facilitate compromise solutions, display and enable teamwork.
• Training and Knowledge Transfer: Provide technical training or knowledge transfer to internal teams, ensuring smooth handovers and self-sufficiency in routine tasks.
• Assigned ticket handling: Promptly address incidents and change tickets assigned through the ITSM tool, ensuring they are handled immediately upon assignment. This includes following up, prioritizing tasks, and resolving them within the established timeframes and according to SLAs.

Qualifications

• Bachelor plus 10 years of relevant experience.
• Working knowledge of English B2 or higher Common European Framework of Reference for Languages (self-assessment).
• A minimum of 8 years of experience as an ICT Consultant in large-scale enterprise environments, tasked with systems administration of mission-critical production systems
• A minimum of 6 years of experience in Database Administration with sensitive data in complex high-security environments
• A minimum of 5 years of experience in Database Administration with the following tools and technologies: MariaDB and/or MySQL, MySql Workbench, maria backup, mysqlbinlog
• A minimum of 5 years of experience in Database Administration with the following technologies: PostgreSQL, pgAdmin, pgBackRest, Patroni

Desirable:

• A minimum of 3 years of experience in Database Administration with technologies for: High Availability and Disaster Recovery, Clustering solutions, Data replication, Galera, MaxScale, WSFC
• Experience in Database Administration with the following technologies: MongoDB, Cassandra
• Experience in working with the following technologies: VMWare virtualization, Containerization with Kubernetes
• Experience in Database Administration with the following technologies: Microsoft SQL Server, AlwaysOn Availability Groups
• Experience in working with tools and technologies for the implementation of Business Intelligence solutions including ETL, OLAP, Reporting
• Experience in Database Administration with all mentioned DBMSs and technologies: for on-premise environments
• Experience in the development of scripts and solutions for: DevOps pipelines, Automated Deployment, Database schema versioning and deployment, Puppet, AzureDevOps/TFS, FlyWay, Bash, Powershell, TerraForm