Fullstack Developer (all genders) - Backend Focus

Your mission The role 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. Your profile You will Own features end-to-end, from architecture, data model and backend implementation to frontend, deployment and production supportDesign, build and operate container-based backend services, APIs and infrastructure in AWSDesign solutions for distributed, message-driven and service-oriented systemsImplement the frontend part of your features in Angular based on product requirements and designsAnalyse business requirements and translate them into pragmatic technical solutions, and continuously improve the performance, reliability and maintainability of existing applicationsWrite clean, maintainable and understandable code with appropriate automated tests; conduct thorough code reviews and contribute to engineering standardsTroubleshoot and debug issues across backend, frontend and infrastructureCollaborate closely with product, design and other engineers in an agile environmentUse AI coding assistants and agents as a regular part of your engineering workflow: break engineering work down so that it can be delegated effectively to AI agents, and critically review AI-generated code with the same standards as human-written code You have 5+ years of professional software development experience, with the majority of your experience focused on backend engineeringStrong 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 oneIn-depth understanding of REST APIs, message-based systems, microservice architectures and distributed systemsStrong experience with relational databases, data modeling and schema designHands-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 AWSExperience using AI coding assistants or agents such as Claude Code, Cursor, or GitHub CopilotClear communication in English, our working language, and a collaborative engineering mindset; German is a plus Bonus points for Experience with NoSQL systemsCI/CD pipeline design, Infrastructure as Code (Terraform or CloudFormation) and serverless architecturesDomain-Driven DesignLLM-based application development, including RAG, tool/function calling, MCP servers, or agent orchestrationComponent libraries, design systems, and frontend performance optimizationAWS certifications Why us? Inclusive, multinational team with 18+ nationalities. English is our company languageRemote-first within Germany; hybrid-friendly with a modern office in Mainz (open spaces, coffee bar, meeting pods)Flexible working hours. We trust you to deliver results, wherever and whenever you workLow-hierarchy, open-feedback culture where your voice shapes strategyRadical transparency: smart minds collide, great ideas happenReal ownership: you ship features end-to-end and see them in productionAI coding tools as a standard part of the engineering workflowFully paid company workation every yearLearning & development budget: conferences, certifications, and language courses50 € hrmony voucher: sports, takeout, shopping, your callHardware of your choiceCompetitive salary plus performance-based bonusDirect impact on the circular battery ecosystem, helping close the loop on used EV batteries About Us 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.