Application Guide

How to Apply for (Junior) Data Engineer - Data Platform (m/f/d)

at 1KOMMA5°

🏢 About 1KOMMA5°

1KOMMA5° is a fast-growing climate tech company on a mission to make buildings CO2-neutral through decentralized clean energy, mobility, and heat solutions. The company combines software, hardware, and services to create holistic energy systems for residential and commercial buildings, making it a unique player in the green energy transition.

About This Role

As a (Junior) Data Engineer on the Data Platform team, you will architect and manage the data infrastructure that powers data-driven decisions across the organization. Your work will enable efficient ingestion, transformation, and quality assurance of data from diverse sources, directly supporting the company's mission to optimize clean energy systems.

💡 A Day in the Life

Your day might start with a stand-up with the data platform team to discuss progress on pipeline optimizations. You could spend the morning writing Terraform modules to deploy a new data ingestion service on GCP, then pair with a data scientist to troubleshoot a data quality issue in the afternoon. Later, you might review a design doc for a new streaming pipeline for real-time energy monitoring.

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🎯 Who 1KOMMA5° Is Looking For

  • You have 2+ years of hands-on data engineering experience, ideally in a fast-paced tech or climate tech environment, with a proven ability to build scalable data pipelines.
  • You are proficient in Python and SQL for data processing and transformation, and have experience with Terraform (HCL) for infrastructure-as-code.
  • You have strong experience with Google Cloud Platform (GCP), including services like BigQuery, Dataflow, Pub/Sub, and Cloud Storage.
  • You are comfortable working cross-functionally with data scientists, analysts, and product teams to understand data needs and deliver robust solutions.

📝 Tips for Applying to 1KOMMA5°

1

Highlight any experience with IoT or energy-related data (e.g., smart meters, solar inverters) as it directly aligns with 1KOMMA5°'s products.

2

Showcase projects where you built data pipelines from scratch or migrated legacy systems to modern cloud-native architectures, emphasizing scalability and reliability.

3

If you have experience with real-time streaming (e.g., Kafka, Pub/Sub) and batch processing, mention it explicitly, as the role involves both.

4

Tailor your resume to include quantifiable impacts (e.g., 'Reduced data processing time by 40%' or 'Handled 10TB+ daily data ingestion').

5

Include a brief cover letter or note explaining why you are passionate about climate tech and how your skills can drive 1KOMMA5°'s mission.

✉️ What to Emphasize in Your Cover Letter

["Your motivation for working in climate tech and specifically for 1KOMMA5°'s holistic approach to CO2-neutral buildings.", "Your hands-on experience with GCP and Terraform, and how you've used them to build reliable data platforms.", 'Your ability to collaborate with cross-functional teams (data scientists, product managers) to translate business requirements into technical solutions.', 'Any experience with data quality frameworks, monitoring, or ensuring data accessibility for non-technical stakeholders.']

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🔍 Research Before Applying

To stand out, make sure you've researched:

  • → Read about 1KOMMA5°'s product ecosystem: their energy management platform, hardware partners, and the 'Heartbeat' AI system.
  • → Understand the German energy market and regulations (e.g., EEG) that impact decentralized energy solutions.
  • → Look at their engineering blog or tech talks (if available) to understand their current tech stack and data challenges.
  • → Check recent news or press releases about company growth, funding, or new product launches to show awareness.

💬 Prepare for These Interview Topics

Based on this role, you may be asked about:

1 Design a data pipeline to ingest and process real-time energy consumption data from thousands of buildings.
2 How would you ensure data quality and consistency across multiple sources (e.g., solar, heat pump, grid data)?
3 Describe your experience with Terraform: how do you manage state, modules, and secrets in a team environment?
4 Explain how you would optimize a slow BigQuery query processing terabytes of data.
5 Tell us about a time you had to balance technical debt with delivering a feature quickly in a fast-paced startup.
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⚠️ Common Mistakes to Avoid

  • Submitting a generic application without mentioning GCP or Terraform, which are key requirements.
  • Focusing only on theoretical knowledge without concrete examples of building and maintaining data pipelines.
  • Ignoring the company's mission: failing to connect your work to climate impact can be a missed opportunity.

📅 Application Timeline

This position is open until filled. However, we recommend applying as soon as possible as roles at mission-driven organizations tend to fill quickly.

Typical hiring timeline:

1

Application Review

1-2 weeks

2

Initial Screening

Phone call or written assessment

3

Interviews

1-2 rounds, usually virtual

✓

Offer

Congratulations!

Ready to Apply?

Good luck with your application to 1KOMMA5°!

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