Senior DB Engineer: Scale, Migrations & Performance

Vacant; Den Haag; On-site; EUR 66,000 - 79,000; Full time

Benefits offered by this job

Fixed salary up to €6,500 gross permo.

Personal development budget

25 vacation days + birthday off

In-house chef lunch daily

Travel allowance

Job summary

Dyflexis seeks an experienced database professional to own the performance, stability, and scalability of our database infrastructure across clusters. You will review queries, oversee migrations with Atlas, and collaborate with the Platform team to embed database considerations from the start.

The role requires deep MySQL expertise, experience with another DBMS (PostgreSQL/Oracle/MSSQL), and strong PHP reading/review skills, paired with excellent English communication.

Qualifications

• 5+ years of experience as a database administrator or database engineer, ideally across large or complex databases.
• Experience in fintech, HR tech, SaaS, or ticketing and ordering platforms is a plus. Certification helps but is not required.
• Deep expertise in MySQL, with solid experience in another DBMS (Postgres, Oracle, MSSQL Server a plus).
• Familiarity with PHP, to read and review how developers write queries and loops.
• Excellent written and spoken English with clear communication.

Responsibilities

• Own production database performance: review, optimise queries, indexing, and execution plans using MySQL.
• Run migrations across database clusters, including Atlas.
• Improve and evolve database infrastructure with scaling strategies like sharding/partitioning.
• Write and maintain standards for database work across teams (data modelling to migrations).
• Handle regular database maintenance (monitoring, mutations, schema changes).
• Review merge requests and PHP code touching the database and shape early DB approach.

Skills

Database administration

Query optimization

English communication

SQL proficiency

Team collaboration

Education

Database certification

Tools

MySQL

PostgreSQL

Atlas

PHP

Job description

Dyflexis seeks an experienced database professional to own the performance, stability, and scalability of our database infrastructure across clusters. You will review queries, oversee migrations with Atlas, and collaborate with the Platform team to embed database considerations from the start.

The role requires deep MySQL expertise, experience with another DBMS (PostgreSQL/Oracle/MSSQL), and strong PHP reading/review skills, paired with excellent English communication.