(Senior) Backend Engineer (m/w/d)

At GALVANY, our goal is to make climate-neutral living a reality for everyone. We focus on execution – developing concrete, smart solutions and making heat pumps, battery storage, and smart metering easy to access, reliable, and affordable. GALVANY-Tech drives the energy transition through software. We're building an AI-based Operating System for sales, planning, installation and operation of heat pumps and integrated energy systems – from single-family homes to multi-unit buildings, and across our Energy Community as a Virtual Power Plant. We are a profitable green-tech startup and believe that sustainable impact and long-term growth are only possible when grounded in a healthy business model. To implement our ambitious tech roadmap, we secured €10 million in seed funding from Set Ventures and AENU in the spring 2026. Driven by customer value, clarity, and responsibility, we stand for high-quality heating solutions and an environment where people take responsibility and drive lasting impact. The Role As a Backend Engineer at GALVANY, you will be a core architect of our AI-based Operating System. You'll design and scale the systems that bridge the gap between complex energy hardware and seamless digital experiences. Whether you are optimizing our Virtual Power Plant, building high-performance APIs for our customer apps, or engineering the core platform that powers our entire business, your work will be the backbone of the energy transition. Responsibilities: - Design and implement robust, event-driven architectures using Go and Kafka to support a diverse range of product domains. - Develop high-quality APIs and data integrations that connect our platform to physical devices, external markets, and user-facing interfaces. - Integrate LLMs and machine learning models into backend services to solve complex problems and enhance our "Gen AI" infrastructure. - Take end-to-end responsibility for services, from initial design and testing to deployment and long-term observability. - Design and implement automation solutions that create real business value – be open to workflow engines (e.g. n8n) and low-code platforms (e.g. Airtable) alongside custom code. Note: DevOps/SRE/Platform engineers are also very welcome to apply to this opening. Tech Stack: Backend with GoLang; ML with Python, PyTorch, and LLMs; Frontend with React, Tailwind, and Shadcn; Mobile with Flutter; General tools including Azure, GitHub, Linear, Notion, Kafka, Benthos (data pipeline), n8n / Kestra (workflow engine), and low-code process automation platforms. Requirements - Experience. 3+ years of experience in high-performance environments (e.g. top-tier consulting, fast-scaling startups, or similar). - Track Record. Proven end-to-end responsibility in software engineering or infrastructure/DevOps. From ideation to release. - Background. Strong background in relevant fields, e.g. Computer Science, Software Engineering, or similar. - Technical Skills. Strong coding skills with proficiency in Go, or similar. Familiarity with event-driven architecture and a "right tool for the job" mindset regarding automation. Fluent in spec-driven, AI-assisted development (e.g. Claude Code). - Mindset. Self-driven problem-solving mindset – no need for micromanagement or specific tickets. - Technical Aptitude. Technical mindset with a passion for understanding systems, data flows, and integrations, coupled with enthusiasm for continuous learning and problem solving. - Language. Fluent in English; German is a plus. Skillls and Qualities That Are Important to Us - Outcome-Led. You focus on value over volume. You embrace iteration, adapt quickly to new information, and prioritize what moves the needle for business and user. - Systems Thinker. You see the bigger picture. You understand how your work connects to the wider ecosystem – ensuring features contribute to a cohesive, scalable whole. - Pragmatic. You choose the simplest effective path to solve problems – especially by leveraging AI tools. - Customer Champion. You keep the end-user central in all decisions. You seek direct exposure to how customers experience the product. - Craft & Reliability. You write testable, observable code. You think about failure modes, error handling, and maintainability from day one. - Integration Architect. You excel at connecting complex systems. Whether it's orchestrating data via Kafka, building clean APIs, or automating workflows, you ensure information flows seamlessly and securely across our infrastructure. Benefits - Strong Growth & High Impact. A unique opportunity to join during a hypergrowth phase and actively contribute to company success. - Compensation. Competitive salary and flexible perks (sports, mobility, learning) tailored to your needs. - Real-World Impact. Your work drives decarbonization – measurable in CO₂ savings, energy efficiency (kWh), and cost reductions (€). - Office. Prime location in Berlin Charlottenburg, regular company events and all-hands. We value in-person collaboration and connection, while partial remote work remains an option. - No Corporate Theater. Skip endless alignment meetings, politics and waiting for permission. You talk to the people who matter and ship.