Senior Data Engineer — (all genders)

Circunomics

Frankfurt

Hybrid

EUR 60,000 - 85,000

Full time

14 days+

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Benefits offered by this job

Flexible Working Hours

€50 Monthly Perks

28 Holiday Days + Public Holidays

Dedicated L&D Budget

Hybrid Work Options

Flat Hierarchies

Career Growth & Mentorship

Job summary

Circunomics is seeking a Senior Data Engineer to join their innovative team focused on battery lifecycle management. The role involves developing scalable applications, managing big data environments, and mentoring junior developers. Ideal candidates will have extensive experience in Python and ETL processes, contributing to a circular battery economy.

Qualifications

5-7 years of experience as a Data Engineer.
Proficient in Python 3, FastAPI or Flask.
Experience with big data environments and ETL processes.

Responsibilities

Design and deploy scalable applications using Python.
Manage big data environments and implement ETL processes.
Mentor junior developers and ensure code quality.

Skills

Python 3

Big Data Management

ETL Processes

Problem-solving

Communication

Adaptability

Education

Bachelor's degree in Computer Science or related field

Tools

Docker

Kubernetes

AWS

Airflow

Terraform

Job description

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At Circunomics, we have made it our mission to provide innovative solutions for complete battery lifecycle management. Through battery analytics and a B2B marketplace, we are bringing industries together to encourage energy efficiency, reduce waste, and create a positive impact on the environment. Join our passionate team as we strive towards creating a true circular battery economy.

End-to-End Development: Design, develop, and deploy scalable, maintainable, efficient, and reliable applications using Python 3, FastAPI or Flask, with optional use of Angular. Ensure seamless integration of back-end components.
Big Data Management: Handle (near) real-time big data environments, managing and processing datasets starting from terabytes with precision and efficiency.
ETL Processes: Design, implement, and manage ETL (Extract, Transform, Load) processes to ensure efficient data handling through its entire lifecycle.
Performance Optimization: Implement caching services like Redis to improve application performance.
Data Pipelines: Develop and manage data pipelines using Airflow.
Mentorship: Provide guidance and mentorship to junior developers, fostering a culture of continuous learning and improvement within the team.
Architecture & Design: Collaborate with architects and other developers to design robust, high-performance, secure application architectures.
Collaboration: Work closely with product managers, designers, and other stakeholders to understand requirements, provide technical insights, and ensure the successful delivery of features.
Code Quality & Best Practices: Write clean, efficient, and well-documented code while setting and maintaining high standards for code quality through code reviews, testing, and automated tooling.
Containerization: Containerize applications using Docker and manage container orchestration with Kubernetes.
Infrastructure Management: Create and manage infrastructure using Helm Charts and Terraform.
Cloud Deployment: Deploy and manage applications on AWS cloud platforms, including S3, ECR, EKS, RDS, and EFS.
Data Visualization: Create data visualizations using Plotly.
CI/CD Implementation: Implement CI/CD pipelines using GitHub.
Troubleshooting & Optimization: Troubleshoot and resolve application issues while optimizing performance.

Your profile

Experience: You have a minimum of 5 to 7 years of professional experience as a Data Engineer, particularly with Python 3, FastAPI, or Flask, and optional familiarity with Angular. You have a strong track record of designing and deploying scalable applications across backend components and, optionally, front-end components.
Big Data Management: You possess deep knowledge in managing (near) real-time big data environments, dealing with datasets starting from terabytes. You have implemented processes to efficiently handle, analyze, and process large volumes of data within strict deadlines.
ETL Processes: You are proficient in implementing ETL (Extract, Transform, Load) processes, ensuring effective and efficient data handling throughout its lifecycle.
Deep Understanding: You have in-depth knowledge of software development methodologies, RESTful APIs, microservices architecture, and CI/CD pipelines.
Problem-solving: You have strong analytical and problem-solving skills and can tackle complex technical challenges.
Communication: You have excellent communication and interpersonal skills and can convey complex technical concepts to non-technical stakeholders.
Adaptability: You thrive in a fast-paced, dynamic environment and can manage multiple priorities and projects simultaneously.
Language Skills: You have a good command of the English language.
Nice to Have:
- Experience with Dash Framework for data visualization.
- Familiarity with other cloud platforms and technologies.

Why us?

Flexible Working Hours: Embrace a healthy work-life balance with our autonomous scheduling that lets you manage your day effectively.
€50 Monthly Perks: Receive a monthly stipend to use on wellness, dining, or other benefits that suit your lifestyle.
28 Holiday Days + Public Holidays: Enjoy generous time off, including the ability to carry over days or earn extra days for milestones.
Dedicated L&D Budget: Invest in your growth with a budget covering professional certifications, conferences, and personal development opportunities.
Hybrid Work Options: Work from home part-time or full-time, with flexibility around core hours to suit your needs.
Flat Hierarchies: Experience open communication and collaborative decision-making in our innovative environment.
Career Growth & Mentorship: Advance your career with creative freedom, mentorship programs, and clear leadership opportunities.

About Us

Circunomics GmbH, based in Mainz, Germany was founded in 2019. Circunomics is leading the industry by offering a comprehensive battery lifecycle management solution. Co-Founders, Felix Wagner and Jan Born, are dedicated to establishing a true circular battery economy, which in turn, maximizes each stage of battery life. Along with their team, they seek to inspire the movement of batteries from the automotive industry, to the energy sector, and finally on to recyclers who close the loop by recovering any remaining raw materials.

Circunomics has developed an AI-powered, B2B marketplace where cells, modules, and packs can be sold and purchased. Through the Circunomics Analytics product, sellers and buyers alike can obtain a detailed view of their assets. From current SoH to 2nd-life simulation, this product allows for a simpler and more profitable lifecycle management. Circunomics knows that lifecycle planning is complex, and the Battery Matchmakers are on a mission to help ease this process for their customers.

The company has been supported thus far by seed investors and business angels. Startup builder Next Mobility Labs, recycler TES, Orlen VC, and Dr. Peter Mertens (former Chief Technology Officer of Audi) are some of the key players. The Series A funding round was completed in December of 2024 with the addition of investors, Schaeffler and GET Fund.

Official expansion into the US Market transpired in January of 2025 with the hiring of Adam Willmouth who will serve as the company's US Managing Director. Circunomics looks forward to further collaboration with current US clients and to further growth within this key global market.

Top Awards Received:

US-based company Frost & Sullivan awarded Circunomics the 2023 Market Leadership Award. This award identified Circunomics as the Best in Class within the European Circular Marketplace for the Battery Trade Industry. 2023 Market Leadership Award Exposé by Frost & Sullivan
Automobilewoche and McKinsey & Co. awarded Circunomics 2nd Best StartUp within the automotive industry for 2023
Motor Presse Stuttgart, with its leading automotive trade magazine, auto motor und sport, and the HUK-Coburg insurance group awarded Circunomics the Safety & Environment Award for 2024. For more info here.

Top Publications and Podcasts: