Freelance Data Engineer with 4+ years of hands-on experience designing, scaling, and architecting modern, cost-efficient cloud data solutions.
Aktualisiert am 06.08.2026
Profil
Freiberufler / Selbstständiger
Remote-Arbeit
Verfügbar ab: 17.08.2026
Verfügbar zu: 100%
davon vor Ort: 0%
AWS
Python
Data Engineer
SQL
Terraform
Apache Airflow
Amazon Redshift
dbt
Kafka
AWS Glue
Docker
REST
CI/CD
German
Native
English
Fluent (professional context)

Einsatzorte

Einsatzorte

Berlin (+10km)
Deutschland, Schweiz, Österreich
möglich

Projekte

Projekte

10 Monate
2025-10 - heute

Data Platform Architecture

Data Engineer
Data Engineer
  • As the sole Data Engineer, architected and built an end-to-end, multi-source, and cost-optimized ELT business data platform as a data lakehouse in AWS from scratch, extracting from 9+ external APIs (including CRM, billing, and operational systems) and normalizing high-volume data into Redshift.
  • Designed and implemented a domain-oriented transformation layer using dbt (finance, product, RevOps), implementing critical historical data tracking (snapshots) and a semantic layer to serve as the definitive single source of truth for unified business KPIs.
  • Led the data engineering initiatives for the Quote-to-Cash (Q2C) process, enabling highly accurate financial and operational reporting, significantly reducing manual overhead.
  • Orchestrated complex extraction, enrichment, and distribution pipelines using Apache Airflow and Docker, provisioned entirely via Terraform.
  • Developed reverse ETL service, and implemented modern MCP servers (SQL access, external tool integrations) to streamline data availability for downstream teams.
Apaleo GmbH
4 Monate
2025-10 - 2026-01

Data Platform Maintenance & Enhancements

Data Engineer
Data Engineer
  • Sustained critical continuity for the production data platform, ensuring 100% service availability for internal users.
  • Optimized architectural integrity and system performance by executing strategic feature additions and technical debt reduction.
  • Managed onboarding and knowledge transfer for a new data engineer.
Xentral ERP Software GmbH
3 Monate
2025-10 - 2025-12

E-Commerce Automation & Management Platform

Data Engineer
Data Engineer
  • Led the complete re-architecture of the legacy system, effectively building a V2 e-commerce management platform from scratch to modernize all core operations.
  • Spearheaded the end-to-end creation of the platform, encompassing cloud infrastructure (Terraform, AWS), Python automation backend, and a modern Next.js frontend.
  • Engineered a robust Python backend for automating complex e-commerce operations, integrating with marketplace APIs for real-time data synchronization and developing a management dashboard for sales visualization.
LotusiCafe
3 Jahre 5 Monate
2022-05 - 2025-09

Migrating ETL pipelines

Senior Data Engineer
Senior Data Engineer
Promoted from Junior to Medior (Apr 2023) and Senior (Apr 2024) based on performance and scope of responsibilities.
  • Took full ownership of Xentral?s internal BI backend, covering data domains like finance, RevOps, and operations, managing infrastructure and data pipelines supporting 100+ internal users.
  • Cut costs by 25% and boosted performance by migrating ETL pipelines from Glue to Athena and ECS.
  • Co-led the adoption of Apache Airflow, data quality tests, and Iceberg tables, reducing the release of data with data quality issues to 0.
  • Designed and launched Xentral?s first event-driven data pipelines using Webhooks, SQS, and AWS Lambda, enabling near real-time updates for key business metrics, reducing data latency from 24 hours to sub-minute intervals.
  • Developed and maintained services in Go, including a production-grade exchange rate service documented using OpenAPI.
  • Designed the data products powering 20+ internal dashboards, collaborating closely with Looker users to align models with business needs.
  • Set up centralized data cataloging via a custom metadata repository, syncing documentation to Confluence, AWS Glue, and Looker to standardize internal and in-product data visibility.
Xentral ERP Software GmbH
2 Jahre 10 Monate
2019-07 - 2022-04

Designed and built a custom ERP system

Software Developer
Software Developer
  • Promoted from working student to full-time developer in Oct 2021 after demonstrating initiative and delivery ownership.
  • Designed and built a custom ERP system from scratch using Flask, HTML, CSS, and JavaScript.
  • Designed a dynamic pricing engine integrated with multiple marketplace APIs, increasing pricing accuracy and reducing daily manual adjustments by over 95%.
  • Automated stock synchronization and order ingestion from 5+ wholesalers, cutting fulfillment delays and order processing time from several hours to <10 minutes.
  • Modernized internal tooling and workflows, including full automation of marketplace listings enabling direct wholesaler-to-consumer offers and eliminating manual effort.
LotusiCafe

Aus- und Weiterbildung

Aus- und Weiterbildung

2021

Mathematics

B.Sc., Grade: 1.5

TU Berlin


Key Focus:

Statistics, optimization, and data-related topics


5 semesters M.Sc. Mathematics

discontinued to focus on career


Key Focus:

Probability theory and functional analysis


Certification

IBM Data Science Professional Certificate

Kompetenzen

Kompetenzen

Top-Skills

AWS Python Data Engineer SQL Terraform Apache Airflow Amazon Redshift dbt Kafka AWS Glue Docker REST CI/CD

Produkte / Standards / Erfahrungen / Methoden

Profile

Freelance Data Engineer with 4+ years of hands-on experience designing, scaling, and architecting modern, cost-efficient cloud data solutions. Led key initiatives in data pipeline development, cloud optimization (AWS, Athena, Airflow, dbt), and event-driven architectures. Excels at driving projects end-to-end, from concept (0-1) to production, across multiple simultaneous client engagements. Delivered production-ready systems by translating complex business needs into scalable, maintainable data workflows. Strong focus on data automation, transformation, and tooling to support analytics, operations, and product teams. Proven ability to drive data engineering efforts end-to-end, from architecture to deployment, across business critical domains.


TECHNICAL SKILLS

Tools

  • Terraform
  • Flask
  • FastAPI


Data & Workflow Tools

  • Airflow
  • Apache Iceberg
  • Apache Kafka
  • Athena, Glue
  • Pandas, PySpark
  • event-driven pipelines
  • dbt


Cloud & Infrastructure

  • AWS (S3, Lambda, ECS, RDS, SNS, SQS, CloudWatch)
  • Terraform
  • Docker, CI/CD, New Relic


Storage

  • Redshift
  • S3-based data lakes


External APIs & Integrations

  • HubSpot
  • Chargebee
  • Planhat
  • Personio
  • Atlassian (Jira)
  • Adyen
  • Zendesk
  • ECB
  • EFSTA
  • Circle


Other

  • Analytics tooling
  • data quality frameworks
  • REST API design
  • data modeling
  • big data technologies


SOFT SKILLS & RECOGNITION

  • Led complex projects independently and reliably, from concept to production.
  • Effective communicator across technical, product, and business stakeholders.
  • Reliable, proactive, and composed under pressure.
  • Praised in peer reviews for delivering high-quality work with clear communication and execution focus.

Programmiersprachen

Python
SQL
Go

Datenbanken

PostgreSQL
MySQL

Einsatzorte

Einsatzorte

Berlin (+10km)
Deutschland, Schweiz, Österreich
möglich

Projekte

Projekte

10 Monate
2025-10 - heute

Data Platform Architecture

Data Engineer
Data Engineer
  • As the sole Data Engineer, architected and built an end-to-end, multi-source, and cost-optimized ELT business data platform as a data lakehouse in AWS from scratch, extracting from 9+ external APIs (including CRM, billing, and operational systems) and normalizing high-volume data into Redshift.
  • Designed and implemented a domain-oriented transformation layer using dbt (finance, product, RevOps), implementing critical historical data tracking (snapshots) and a semantic layer to serve as the definitive single source of truth for unified business KPIs.
  • Led the data engineering initiatives for the Quote-to-Cash (Q2C) process, enabling highly accurate financial and operational reporting, significantly reducing manual overhead.
  • Orchestrated complex extraction, enrichment, and distribution pipelines using Apache Airflow and Docker, provisioned entirely via Terraform.
  • Developed reverse ETL service, and implemented modern MCP servers (SQL access, external tool integrations) to streamline data availability for downstream teams.
Apaleo GmbH
4 Monate
2025-10 - 2026-01

Data Platform Maintenance & Enhancements

Data Engineer
Data Engineer
  • Sustained critical continuity for the production data platform, ensuring 100% service availability for internal users.
  • Optimized architectural integrity and system performance by executing strategic feature additions and technical debt reduction.
  • Managed onboarding and knowledge transfer for a new data engineer.
Xentral ERP Software GmbH
3 Monate
2025-10 - 2025-12

E-Commerce Automation & Management Platform

Data Engineer
Data Engineer
  • Led the complete re-architecture of the legacy system, effectively building a V2 e-commerce management platform from scratch to modernize all core operations.
  • Spearheaded the end-to-end creation of the platform, encompassing cloud infrastructure (Terraform, AWS), Python automation backend, and a modern Next.js frontend.
  • Engineered a robust Python backend for automating complex e-commerce operations, integrating with marketplace APIs for real-time data synchronization and developing a management dashboard for sales visualization.
LotusiCafe
3 Jahre 5 Monate
2022-05 - 2025-09

Migrating ETL pipelines

Senior Data Engineer
Senior Data Engineer
Promoted from Junior to Medior (Apr 2023) and Senior (Apr 2024) based on performance and scope of responsibilities.
  • Took full ownership of Xentral?s internal BI backend, covering data domains like finance, RevOps, and operations, managing infrastructure and data pipelines supporting 100+ internal users.
  • Cut costs by 25% and boosted performance by migrating ETL pipelines from Glue to Athena and ECS.
  • Co-led the adoption of Apache Airflow, data quality tests, and Iceberg tables, reducing the release of data with data quality issues to 0.
  • Designed and launched Xentral?s first event-driven data pipelines using Webhooks, SQS, and AWS Lambda, enabling near real-time updates for key business metrics, reducing data latency from 24 hours to sub-minute intervals.
  • Developed and maintained services in Go, including a production-grade exchange rate service documented using OpenAPI.
  • Designed the data products powering 20+ internal dashboards, collaborating closely with Looker users to align models with business needs.
  • Set up centralized data cataloging via a custom metadata repository, syncing documentation to Confluence, AWS Glue, and Looker to standardize internal and in-product data visibility.
Xentral ERP Software GmbH
2 Jahre 10 Monate
2019-07 - 2022-04

Designed and built a custom ERP system

Software Developer
Software Developer
  • Promoted from working student to full-time developer in Oct 2021 after demonstrating initiative and delivery ownership.
  • Designed and built a custom ERP system from scratch using Flask, HTML, CSS, and JavaScript.
  • Designed a dynamic pricing engine integrated with multiple marketplace APIs, increasing pricing accuracy and reducing daily manual adjustments by over 95%.
  • Automated stock synchronization and order ingestion from 5+ wholesalers, cutting fulfillment delays and order processing time from several hours to <10 minutes.
  • Modernized internal tooling and workflows, including full automation of marketplace listings enabling direct wholesaler-to-consumer offers and eliminating manual effort.
LotusiCafe

Aus- und Weiterbildung

Aus- und Weiterbildung

2021

Mathematics

B.Sc., Grade: 1.5

TU Berlin


Key Focus:

Statistics, optimization, and data-related topics


5 semesters M.Sc. Mathematics

discontinued to focus on career


Key Focus:

Probability theory and functional analysis


Certification

IBM Data Science Professional Certificate

Kompetenzen

Kompetenzen

Top-Skills

AWS Python Data Engineer SQL Terraform Apache Airflow Amazon Redshift dbt Kafka AWS Glue Docker REST CI/CD

Produkte / Standards / Erfahrungen / Methoden

Profile

Freelance Data Engineer with 4+ years of hands-on experience designing, scaling, and architecting modern, cost-efficient cloud data solutions. Led key initiatives in data pipeline development, cloud optimization (AWS, Athena, Airflow, dbt), and event-driven architectures. Excels at driving projects end-to-end, from concept (0-1) to production, across multiple simultaneous client engagements. Delivered production-ready systems by translating complex business needs into scalable, maintainable data workflows. Strong focus on data automation, transformation, and tooling to support analytics, operations, and product teams. Proven ability to drive data engineering efforts end-to-end, from architecture to deployment, across business critical domains.


TECHNICAL SKILLS

Tools

  • Terraform
  • Flask
  • FastAPI


Data & Workflow Tools

  • Airflow
  • Apache Iceberg
  • Apache Kafka
  • Athena, Glue
  • Pandas, PySpark
  • event-driven pipelines
  • dbt


Cloud & Infrastructure

  • AWS (S3, Lambda, ECS, RDS, SNS, SQS, CloudWatch)
  • Terraform
  • Docker, CI/CD, New Relic


Storage

  • Redshift
  • S3-based data lakes


External APIs & Integrations

  • HubSpot
  • Chargebee
  • Planhat
  • Personio
  • Atlassian (Jira)
  • Adyen
  • Zendesk
  • ECB
  • EFSTA
  • Circle


Other

  • Analytics tooling
  • data quality frameworks
  • REST API design
  • data modeling
  • big data technologies


SOFT SKILLS & RECOGNITION

  • Led complex projects independently and reliably, from concept to production.
  • Effective communicator across technical, product, and business stakeholders.
  • Reliable, proactive, and composed under pressure.
  • Praised in peer reviews for delivering high-quality work with clear communication and execution focus.

Programmiersprachen

Python
SQL
Go

Datenbanken

PostgreSQL
MySQL

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