Data Engineer

Company: alcemy
Location: Berlin Mitte (Hybrid - 2 days/week remote)
Salary: €60,000–75,000 + VSOP equity

About alcemy:
alcemy is on a mission to decarbonize cement and concrete, aiming to prevent 100 million tons of CO₂ emissions annually by 2030. Our machine-learning software operates 24/7 in cement and concrete plants to reduce emissions without compromising quality or increasing costs. We are already operational in a significant portion of Germany's cement plants and over 30 ready-mix concrete plants.

The Role:
As our Data Engineer, you will own the data infrastructure that powers our machine learning recommendations. This role involves approximately 80% data engineering and 20% backend work, with significant customer interaction. You will analyze real-world data, explain findings to non-technical stakeholders, and streamline data ingestion into alcemy.

What you’ll do:

• Build and own pipelines for ingesting and cleaning raw plant data for ML utilization.
• Contribute to moving from strict data requirements to flexible, AI-powered ingestion for reduced customer onboarding friction.
• Track data anomalies and communicate findings clearly to customers.
• Build and maintain APIs and PostgreSQL databases, ensuring smooth production operations.
• Collaborate closely with customers, sales, and customer success teams, bridging technical and non-technical communication.

You’ll thrive here if:

• You care deeply about climate change and want your work to have a significant impact.

Must-haves:

• Proven production Python experience.
• Ability to quickly grasp unfamiliar codebases and deliver impactful work.
• Comfort working directly with customers, sales, and customer success teams; patient and clear communication with non-technical enterprise teams.
• Openness to using AI tools to augment your work.

Nice-to-haves:

• Experience with Flask or Django.
• Experience with PostgreSQL or similar SQL databases.
• Exposure to machine learning.

How we work:

• Collaborative team environment with end-to-end feature ownership.
• Fast-paced startup environment with async communication, sharp prioritization, transparency, and direct feedback.
• Responsible use of AI tools (e.g., Claude Code) with engineers always in charge.
• Hybrid work model (Berlin Mitte office, up to 2 days remote) with opportunities for growth (technical expert or management tracks).
• 25 days’ vacation + additional days for tenure + days between Christmas and New Year off.
• €1,500/year and 3 days/quarter for personal development.
• Choice of Mac laptop.
• Office located in the heart of Berlin Mitte.

Our Tech Stack:

• Backend & Data: Python (FastAPI, SQLAlchemy, pydantic, pytest, mypy), pandas, polars, numpy, sklearn; uv.
• Infra: PostgreSQL, AWS on Kubernetes (Terraform), ArgoWorkflows, GitLab.
• Frontend: React & Next.js (TypeScript, TailwindCSS), Blueprint.js / Radix UI, TanStack Query or axios; Streamlit.

Hiring Process (Fully Remote):

1. Intro call with Recruiter.
2. Meet Hiring Manager.
3. Take-home task.
4. Technical interview (90 min) with live coding.
5. Team-fit interview (45 min).

alcemy is committed to building a diverse team and welcomes applications from all individuals. We offer adjustments for candidates needing support during the hiring process. Please note, visa sponsorship is not currently offered; a valid EU work visa is required.