Junior Data Engineer

reeeliance; Hamburg; On-site; EUR 55,000 - 75,000; Full time

Benefits offered by this job

Mentorship

Onboarding

International projects

Language courses

Learning budget

Team events Berlin/Hamburg

Work‑life balance

Pension scheme

Job bike

Job summary

Die Demo Daten GmbH sucht junior Data Engineer, um skalierbare Data-Pipelines zu entwerfen, zu bauen und in unsere Data-Stack-Architektur zu integrieren. Du unterstützt ETL/ELT-Prozesse und arbeitest eng mit Senior Engineers zusammen.

Du bringst Grundkenntnisse in Python, SQL, Git mit und hast idealerweise Erfahrung in Cloud-Umgebungen (Azure/AWS). Deutsch (C1) und Englisch (B2) runden dein Profil ab.

Qualifications

• Fundierte Kenntnisse in Datenmodellierung und modernen Data-Warehousing-Architekturen.
• Python-Programmierung und SQL-Kompetenz für Abfragen komplexer Datensätze.
• Erfahrung mit Git und kollaborativer Entwicklung.
• Erste praktische Erfahrung in Cloud-Umgebungen (Azure oder AWS).
• Bereitschaft, neue ETL/ELT-Tools und Cloud-Technologien zu lernen.
• Gute Problemlösungsfähigkeiten und proaktives Lernverhalten.
• Selbstständiges Arbeiten sowie Teamarbeit in agilen Projekten.

Responsibilities

• Entwerfen, bauen und betreiben von Data-Pipelines gemäß Kundenbedürfnissen und Einbindung in den bestehenden Data-Stack.
• Wartung und Optimierung der Data-Infrastruktur für ETL/ELT-Prozesse.
• Aufbau, Test und Deployment von Data-Artifacts in Cloud-Umgebungen.
• Zusammenarbeit mit Senior Engineers zur Sicherstellung von Data-Qualität, Datenschutz und Sicherheit.
• Überwachung der Pipeline-Performance und Identifikation von Optimierungspotenzialen.
• Zusammenarbeit mit Reeeliance- und Kundenteams in einem agilen Projektteam.

Skills

Python

SQL

Git

Cloud platforms

Datenmodellierung

DWH/Datavarchitektur

Deutsch (C1)

Englisch (B2)

Education

Universitätsabschluss in Informatik/IT

Tools

Git

Job description

About The Role

Data is undeniably one of the world's most valuable resources. However, it's futile if it's not in the right place or the right setup. We strive to place data where it's needed most and can be used to its fullest potential.

Become a valued member of our data integration team and start your journey building scalable data architectures and fast data pipelines for our multinational clients. Our use cases range from data warehouse and lakehouse architecture implementations over IoT and data streaming setups to sophisticated AI scenarios, in industries ranging from manufacturing, consumer products, and healthcare to banking and insurance, just to name a few.

Your responsibilities

• You will support the team in designing, building, and maintaining data pipelines according to client business needs and embedding them end-to-end into the given data stack
• On this role, you will assist in maintaining and optimizing data infrastructure required for data extraction, transformation, and loading (ETL/ELT) from a wide variety of data sources
• As a junior Data Engineer, you will build, test, and deploy data artifacts on cloud platforms using modern version control best practices
• You will collaborate with senior engineers to ensure data accuracy, integrity, privacy, security, and compliance by applying data quality assurance methods
• Monitoring data pipeline performance and assisting in identifying opportunities for pipeline optimization
• In this role, you will work closely together with both reeeliance and client staff as part of an agile project team

Our requirements

• Solid foundational knowledge of data modeling concepts and modern data warehousing architectures
• Proficiency in Python and strong SQL skills for querying and manipulating complex datasets
• Hands‑on experience with Git for version control and collaborative development
• Practical exposure to or understanding of working within cloud environments (such as Azure or AWS)
• Eagerness to learn new ETL/ELT tools, cloud technologies, and software engineering practices
• Strong problem‑solving attitude and an enthusiastic, proactive approach to learning
• Ability to work both independently on delegated tasks and collaboratively within agile project teams
• A university degree in Computer Science, Information Technology, or a related discipline (or equivalent practical experience)
• Articulate with impeccable verbal and written communication skills in German (C1 level) and English (B2 level). Strong & discerning listener

What we offer

• Space to grow: Taking ownership in international projects while continuously expanding your skills
• Mentorship and Onboarding: Structured introduction supported by dedicated mentor
• Cutting‑edge workspace: Work with the latest technology and modern equipment to drive innovative solutions
• Long‑term stability: A permanent employment in a family-oriented and people‑focused company
• Diverse & inclusive environment: Join a truly international environment and collaborate daily with teammates from over 15 different nationalities
• Balance matters or work‑life harmony: A work schedule designed to promote well‑being and productivity
• Team culture & connection: Social events and structured team‑building days held in Berlin and Hamburg
• Language courses: Learn, improve or practice your conversational skills on language platform Lingoda
• Never stop learning: You’ll receive a dedicated budget to industry‑leading platforms like Udemy and MasterClass to sharpen your technical expertise and leadership skills
• …and many other Job perks (childcare subsidy, company pension scheme, job bike, etc…)

Über uns

Die Demo Daten GmbH ist ein von Personio geschaffenes, fiktives Unternehmen, welches Ihnen dabei helfen soll die Funktionen von Personio kennenzulernen.