Senior Backend Engineer(m/f/d)

Company Overview

This company is an innovative technology business operating at the intersection of advanced battery technology and software development.

It supports customers throughout the battery lifecycle, from research and development to production readiness and data‑driven optimization.

The Germany-based team serves as the company’s software and digital solutions hub, developing platforms that enable customers to analyze, manage, and extract valuable insights from complex battery data.

By combining expertise in battery science with modern software engineering, the company helps customers accelerate innovation, improve product performance, and make informed technical and business decisions.

Job Description

We’re building a high‑impact Saa S platform at the intersection of Battery Design, Development, and Production and software, focused on solving real‑world problems in the battery ecosystem.

We’re looking for a Senior Backend Engineer to take ownership of our backend systems – from architecture to production.

You’ll work on systems that ingest, process, and serve complex data, and help shape a platform customers rely on for critical decision‑making.

This is a high‑ownership, hands‑on role for someone who thrives in ambiguity, makes strong technical decisions, and ships reliable systems quickly without sacrificing quality.

Experience in the battery sector and practical AI integration is a strong plus.

• Job Responsibilities
• Design and build scalable, resilient backend systems using Node. js (Nest JS) and Python (Fast API).
• Own API design and service architecture, balancing performance, maintainability, and developer experience.
• Develop and evolve data models and pipelines for complex, real‑world datasets (including battery‑related data).
• Build and maintain multi‑service, cloud‑native systems on AWS.
• Improve system observability, reliability, and incident response practices.
• Drive CI/CD, infrastructure‑as‑code (Terraform), and secure deployment workflows.
• Collaborate closely with product and frontend teams to deliver end‑to‑end features.
• Make pragmatic decisions – knowing when to move fast and when to invest in long‑term architecture.
• Contribute to a culture of high‑quality engineering through code reviews, testing, and continuous improvement.
• Job Requirements
• Mandatory Qualifications
• 5+ years of experience building and operating production backend systems.
• Strong proficiency in Python and Node. js (experience with Nest JS or Fast API is a big plus).

• Deep understanding of

• API design (REST, service boundaries, versioning)
• Distributed systems and microservices tradeoffs
• Data modeling and database performance
• Proven experience building Saa S platforms or complex backend systems

• Hands‑on experience with

• AWS (or similar cloud platforms)
• Docker and containerized environments
• CI/CD pipelines and infrastructure‑as‑code
• Strong experience with Postgre SQL and/or No SQL databases
• Ability to debug and resolve complex production issues.
• Comfortable working in a fast‑moving, startup environment.
• Applicants must already be legally authorized to work in Germany.
• Strong Plus
• Experience in the battery domain.
• Experience building data‑intensive or real‑time systems.
• Exposure to AI/ML systems, LLM integrations, or AI‑powered features.
• Experience designing event‑driven architectures.
• Proven experience in team management and driving technical best practices across backend teams.
• Tech Stack
• Backend: Node. js (Nest JS), Python (Fast API)
• Frontend: React. js (Hooks, Context, modern state management, component libraries)
• Databases: Postgre SQL, Redis, No SQL
• Infrastructure: AWS, Docker, Terraform, Git Hub Actions
• Attractive Points
• Work on real‑world energy problems with tangible impact.
• Own systems end‑to‑end.
• Influence architecture, product, and technical direction.
• Build from first principles in a fast, execution‑focused team.
• High autonomy, low bureaucracy, and meaningful responsibility.

Benefits

• Salary Range: €60,000–€80,000 gross per annum.
• Work Style: 100% onsite in Stuttgart office.
• Team Environment: Agile, collaborative, and high‑ownership culture.
• Career Growth: Clear path toward leadership or specialist roles.
• Learning & Development: Direct access to founders and product teams.
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