Job
- Level
- Senior
- Job Field
- IT, Database, Security
- Employment Type
- Full Time
- Contract Type
- Permanent employment
- Location
- Frankfurt
- Working Model
- Full Remote, Onsite
Job Summary
In this role, you will operate and scale PostgreSQL, ClickHouse, and Elasticsearch clusters, managing high availability, backup strategies, and performance optimization for complex data analytics and OLTP workloads.
Job Technologies
Your role in the team
- Operate, scale and safeguard our PostgreSQL, ClickHouse and Elasticsearch clusters, which provide data redundancy across multiple datacenters and form the backbone of our DDoS defense and WAAP platform.
- Design and maintain high-availability and replication topologies, plan failover and disaster-recovery strategies, and ensure data integrity and durability even when an entire datacenter goes offline.
- Own the full schema lifecycle - review and ship versioned migrations and their matching reverts, enforce our SQL coding guidelines, and keep changes safe to roll out across clusters under heavy load.
- Tune performance end to end: query optimization, indexing, partitioning and sharding strategies, and capacity planning for ingest-heavy OLAP workloads (ClickHouse) alongside transactional OLTP workloads (PostgreSQL).
- Integrate and improve monitoring, alerting, and backup automation so issues are caught before they reach our customers, and so recovery is fast, tested, and reliable.
- Work closely with our development and operations teams as the go-to expert on data modeling, storage and retrieval, supporting them in complex debugging and troubleshooting tasks.
- Contribute to a performance-critical environment where efficiency, scalability, and reliability matter every day.
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Our expectations of you
Qualifications
- Starke Kenntnisse in SQL und ein tiefgehendes Verständnis von Indexierung, Abfrageausführungsplänen, Partitionierung und Leistungsoptimierung.
- Solid grasp of backup, disaster recovery and monitoring/observability practices for data systems.
- A mindset geared toward sharing knowledge, learning continuously, and contributing to technical discussions.
- Ability to work both independently and collaboratively, while communicating requirements, challenges, and progress clearly to technical and non-technical stakeholders.
- Excellent communication skills in English or German.
Experience
- Solid experience administering relational databases in production, with strong expertise in PostgreSQL (replication, high availability, backup/restore, query tuning).
- Hands-on experience with ClickHouse or comparable column-oriented / OLAP databases, including partitioning, MergeTree engines and large-scale ingest.
- Experience operating Elasticsearch (cluster sizing, sharding, index lifecycle management, query and indexing performance).
- Practical experience running databases in clustered, multi-datacenter setups with replication, failover, and data redundancy.
- Umfassende Erfahrung mit Linux-Betriebssystemen und ein gutes Verständnis von Netzwerken, Speicher und deren Einfluss auf die Datenbankleistung.
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What we offer
- Become part of a highly motivated team in which we treat each other with respect.
- Meet your colleagues at eye level. We are all equal and without barriers.
- Live and develop your strengths in a friendly atmosphere.
- Organize yourself in a flexible working model, because you are more than just your job.
- Lead us to success with your skills.
- Community is the trump card: team events, sundowners, after work parties bring us together (also internationally).
- Taking care of our team doesn't end at the coffee machine or a filled fruit basket!
- Look forward to interesting benefits such as fitness, JobRad, support for daycare fees and much more. We are cooperation partners of national and international associations and authorities.
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Benefits
Health, Fitness & Fun
Topics that you deal with on the job
Job Locations
This is your employer
LINK11 GmbH
Link11 GmbH is a leading provider of IT security solutions specializing in protecting infrastructures and web applications from cyber attacks. The company is headquartered in Germany and offers security services worldwide.
Description
- Company Type
- Established Company
- Working Model
- Full Remote, Onsite
- Industry
- Internet, IT, Telecommunication
Senior Database Administrator
- Location
- Frankfurt
- Working Model
- Full Remote, Onsite
- Diversity
- Open for all genders
