Senior Database Engineer - Real-Time, High-Scale

Dotlinkers IT recruitment; Kraków; Hybrid; PLN 210,000 - 320,000; Full time

Benefits offered by this job

Initially remote work

Hybrid work model (3-4 days/week in Kr

Office in Kraków when ready

Job summary

Our client, an Israeli sports-tech company building real-time analytics, seeks a Senior Database Engineer to design, optimize, and scale high-performance database infrastructure supporting millions of transactions and real-time data flows in Kraków. You will work with transactional and document databases, Kafka-based streaming and data lakes, focusing on performance, reliability and data consistency.

You will ensure data accuracy under high concurrency, automate operations, and collaborate with

Qualifications

• 5+ years of hands-on experience in Database Engineering, Database Administration or a similar role.
• Strong experience with large-scale relational databases, particularly PostgreSQL and/or MySQL, handling high transaction volumes.
• Experience working with high-scale document databases, particularly DocumentDB or similar technologies.
• Strong understanding of indexing strategies, query optimization, execution plans and transaction isolation levels.
• Practical experience with database partitioning and data retention/archival strategies.
• Experience operating cloud databases, particularly AWS RDS/Aurora or GCP Cloud SQL.
• Hands-on experience with real-time data streaming, CDC and Kafka, or high-volume ETL processes.
• Experience building and maintaining CI/CD pipelines for databases and schema migrations.
• Strong scripting/automation skills, preferably with Python.
• Ability to troubleshoot complex performance and scalability issues in high-concurrency environments.
• Strong English communication skills (C1); Polish is not required.
• Experience in fintech, iGaming or another highly regulated, transaction-heavy environment is a nice-to-have.

Responsibilities

• Design efficient database schemas and low-latency data access patterns for a microservices environment.
• Analyze and optimize query performance, including indexing, execution plans and high-concurrency bottlenecks.
• Design and implement table partitioning, data retention and archival strategies for large transactional and time-series datasets.
• Move historical and less frequently accessed data to data lake solutions such as Snowflake and S3.
• Design and operate real-time Change Data Capture (CDC) pipelines using Kafka and Debezium.
• Monitor database health, performance and availability, including alerting and proactive identification of throughput or data consistency issues.
• Design and maintain database backup, recovery, encryption and access-control mechanisms in cloud environments.
• Build and maintain database CI/CD pipelines covering schema migrations, version control and automated deployments.
• Automate database operations, ETL workflows and data-quality/anomaly detection processes using Python or similar scripting languages.
• Work closely with engineering and data teams to improve the scalability and reliability of the overall platform.

Skills

Database design

PostgreSQL

MySQL

Kafka

Python

DB CI/CD

Performance tuning

Cloud databases

Tools

Snowflake

Debezium

AWS RDS/Aurora

Job description

Our client, an Israeli sports-tech company building real-time analytics, seeks a Senior Database Engineer to design, optimize, and scale high-performance database infrastructure supporting millions of transactions and real-time data flows in Kraków. You will work with transactional and document databases, Kafka-based streaming and data lakes, focusing on performance, reliability and data consistency.

You will ensure data accuracy under high concurrency, automate operations, and collaborate with