Fullstack Developer - Backend Focus / Remote within Germany

We are looking for a Fullstack Engineer whose primary strength lies in backend engineering, but who is also comfortable implementing production-ready frontend features.

Most of your technical depth will be applied on the backend, but feature ownership does not stop at the API boundary. You join a small cross-functional product team that works with a Product Owner who sets the why, what and when, while the team owns the how. Our technology stack is a containerized PHP/Symfony microservices backend running on AWS infrastructure managed through Terraform, and an Angular frontend. We practise continuous delivery, so your work reaches production quickly and is covered by automated end-to-end tests.

• 5+ years of professional software development experience, with the majority of your experience focused on backend engineering
• Strong professional experience with PHP and Symfony or with another backend ecosystem such as Java, Python or Node.js and the willingness to work in PHP/Symfony from day one
• In-depth understanding of REST APIs, message-based systems, microservice architectures and distributed systems
• Strong experience with relational databases, data modeling and schema design
• Hands-on professional experience implementing frontend features in Angular or a comparable framework such as React or Vue.js; strong in component and state logic and API integration; solid enough in styling to implement a given design.
• Experience with automated testing, Docker and containerized applications, and cloud-native development, ideally hands-on with AWS
• Experience using AI coding assistants or agents such as Claude Code, Cursor, or GitHub Copilot
• Clear communication in English, our working language, and a collaborative engineering mindset; German is a plus
• Experience with NoSQL systems
• CI/CD pipeline design, Infrastructure as Code (Terraform or CloudFormation) and serverless architectures
• Domain-Driven Design
• LLM-based application development, including RAG, tool/function calling, MCP servers, or agent orchestration
• Component libraries, design systems, and frontend performance optimization
• AWS certifications

At Circunomics, we are building the B2B marketplace and data platform for the battery lifecycle: trading first-life, surplus, and second-life batteries, battery analytics, and the digital battery passport. As a green technology and sustainability startup, we use modern software and data-driven insights to keep batteries in use longer, minimize waste, and help accelerate the transition to a sustainable energy future.