Data Engineer – Business Intelligence (BI) (f/m/d)

GMX, WEB.DE & mail.com; Karlsruhe; Hybrid; EUR 55.000 - 75.000; Vollzeit

Benefits dieser Stelle

Internal fitness classes

Training opportunities

Flexible working hours

Relocation service

Zusammenfassung

GMX, WEB.DE & mail.com in Karlsruhe seeks a Data Engineer for their Portal BI Team. This role involves building and maintaining data pipelines, ensuring data quality, and collaborating with stakeholders. Ideal candidates will have strong experience in Data Engineering, a degree in Computer Science, and proficiency in English and German.

The position offers a vibrant corporate culture, opportunities for training, and flexible working models, including home office options and 30 days of vacation.

Qualifikationen

• Hands-on experience in Data Engineering or BI with end-to-end pipeline design.
• Strong curiosity and motivation to explore new technologies.
• Structured approach to root-cause analysis.

Aufgaben

• Onboard new data sources and design scalable data models.
• Translate business requirements into reusable data models.
• Operative stabilization of data pipelines and resolving issues.

Kenntnisse

Data Engineering

BI

Python

SQL

English

German

Ausbildung

Degree in Computer Science or equivalent experience

Tools

Dagster

dbt

Trino

Impala

S3

Tableau

Jobbeschreibung

As a Data Engineer in our Portal BI Team in Karlsruhe, you operate at the core of our data warehouse ecosystem. You integrate new data sources, design and build reliable end-to-end data pipelines, and continuously evolve a scalable, future-ready data platform. You take ownership of data quality and reliability across teams and enable stakeholders to generate insights independently through robust, well-designed data foundations. Working alongside an experienced and collaborative group of data professionals, you help shape the backbone of data-driven decision-making across the company.

You will make a tangible impact through hands‑on project work, clear ownership of platform stability and evolution, and by contributing to a strong enablement culture with a focus on self‑service BI.

Responsibilities

• Onboard new data sources, design data models, and build scalable end‑to‑end pipelines for analysts and business teams.
• Translate business requirements into robust, reusable, and well‑documented data models in close collaboration with stakeholders.
• Continuously evolve our data warehouse landscape using Dagster, dbt, Python, Trino, Impala, S3, GitLab, SQL databases, and Tableau.
• Operate and stabilize pipelines by investigating incidents, resolving data quality issues, and executing historical or long‑running computations.
• Maintain and modernize our SQL Server environment, including code refactoring, performance tuning, capacity planning, backup strategies, and data center migrations.

Your Profile

Do you have a degree in Computer Science or a comparable qualification through practical experience?

• Hands‑on experience in Data Engineering or BI, including end‑to‑end pipeline design, implementation, and operations.
• Strong curiosity and motivation to understand business domains and explore new technologies.
• Ownership mindset with a structured approach to root‑cause analysis and sustainable problem‑solving.
• Enjoy working across complex system landscapes and enabling others with reliable, high‑quality data foundations.
• Professional proficiency in English and German.

Lived corporate culture

Flat hierarchies, a culture of respect and appreciation, signatories of the Diversity Charter, open communication, and no dress code.

Wide range of further training

Internal and external training opportunities, LinkedIn Learning, language courses, talent development programs, conferences, and mentoring.

TEC-Campus

Free choice between Linux, Mac, or Windows, slack days, conferences, lecture series, courses, open‑source projects, community meetups, and user groups.

Active health care

Wellpass, free internal sports and fitness classes, health days, family & care support services, discounts at fitness centers, mental health first responder, fresh fruit and drinks for free.

Mobility

Subsidy for job bike leasing, job ticket, and relocation service if you live outside Germany.

Flexible working models

Home office options, flexible working hours, and 30 days of vacation with the option for additional unpaid leave.

Financial benefits

Corporate benefits, company pension scheme, capital‑forming benefits, occupational disability insurance, and various partner discounts.

Events

Summer and winter parties, sports tournaments, and team events.