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

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{
  "id": "2576616",
  "name": "Senior Software Engineer (Backend) (m/w/d)",
  "office": "Berlin",
  "keywords": [],
  "schedule": "full-time",
  "createdAt": "2026-03-25T16:05:08+00:00",
  "seniority": "experienced",
  "department": "Engineering",
  "occupation": "software_and_web_development",
  "subcompany": null,
  "employmentType": "permanent",
  "jobDescriptions": [
    {
      "name": "This is us",
      "value": "<p><span style=\"font-size:15px;\">Lumenaza is a green-tech company building software for the decentralized energy world. Our platform enables energy providers to manage billing, market communication, and energy data — supporting renewable energy business models at scale.</span></p><p><span style=\"font-size:15px;\">We are driven by a clear mission: accelerating the transition to a sustainable energy system. At the same time, we value diversity, collaboration, and continuous learning.</span></p>"
    },
    {
      "name": "Your tasks",
      "value": "<h3><span style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\">Your Role</span></h3><p><span style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\">As a Senior Backend Engineer, you will design and build core systems that power real-world energy processes — from billing to market communication.</span></p><p><span style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\">You take ownership of complex domains, contribute to architectural decisions, and help evolve both our systems and engineering practices.</span></p><h2><span style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\">What You’ll Do</span></h2><ul><li style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\"><p><strong>Build and own core backend systems</strong><br>Design and implement scalable solutions for billing, tariff models, and energy market processes.</p></li><li style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\"><p><strong>Shape system architecture</strong><br>Work across the full lifecycle — from design to deployment — ensuring maintainability, scalability, and correctness.</p></li><li style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\"><p><strong>Solve complex technical challenges</strong><br>Develop robust solutions involving data modeling, asynchronous processing, and distributed systems.</p></li><li style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\"><p><strong>Collaborate across disciplines</strong><br>Work closely with Product, Frontend, and DevOps to deliver cloud-based solutions and improve our platform.</p></li><li style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\"><p><strong>Drive improvement and innovation</strong><br>Bring in new ideas, improve engineering practices, and explore modern development approaches, including AI-assisted workflows.</p></li><li style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\"><p><strong>Modernize existing systems</strong><br>Help evolve and migrate legacy systems toward modern architectures.</p></li></ul>"
    },
    {
      "name": "Your profile",
      "value": "<h3><span style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\">Core Requirements</span></h3><ul><li style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\"><p>5+ years of backend development experience</p></li><li style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\"><p>Strong Python and Django expertise</p></li><li style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\"><p>Experience designing and building REST APIs</p></li><li style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\"><p>Experience with distributed systems / microservices</p></li><li style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\"><p>Solid understanding of databases (PostgreSQL)</p></li><li style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\"><p>Experience with Docker and CI/CD workflows</p></li><li style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\"><p>Strong communication skills in English</p></li></ul><h3><span style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\">Nice to Have</span></h3><ul><li style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\"><p>Experience with FastAPI, Pydantic, or Django Ninja</p></li><li style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\"><p>Knowledge of Celery or similar async tools</p></li><li style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\"><p>Experience integrating external systems (e.g. ERP, APIs)</p></li><li style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\"><p>Familiarity with React / TypeScript</p></li><li style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\"><p>Interest in energy markets or regulated domains</p></li></ul>"
    },
    {
      "name": "Our Tech Stack",
      "value": "<ul><li style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\"><p>Python, Django, Django REST Framework</p></li><li style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\"><p>PostgreSQL, Redis</p></li><li style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\"><p>Celery (async processing)</p></li><li style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\"><p>Docker, Kubernetes</p></li><li style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\"><p>GitLab CI/CD</p></li><li style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\"><p>Robot Framework (testing)</p></li><li style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\"><p>React (frontend)</p></li></ul><p><span style=\"font-family:Arial, Helvetica, sans-serif;font-size:15px;\">We deploy continuously to Kubernetes and work with distributed systems handling complex, business-critical data.</span></p>"
    },
    {
      "name": "We offer you this",
      "value": "<ul><li style=\"font-size:15px;\"><p>Impact: Build software that directly enables renewable energy business models</p></li><li style=\"font-size:15px;\"><p>Ownership: Work on complex, meaningful systems with real-world impact</p></li><li style=\"font-size:15px;\"><p>Growth: Structured onboarding and continuous learning</p></li><li style=\"font-size:15px;\"><p>Flexibility: Flexible hours and hybrid work setup</p></li><li style=\"font-size:15px;\"><p>Benefits: Competitive compensation, Deutschlandticket</p></li><li style=\"font-size:15px;\"><p>Location: Modern office in Berlin Kreuzberg</p></li></ul><p><span style=\"font-size:15px;\">We strongly encourage applications from underrepresented groups in tech and are committed to building an inclusive environment.</span></p>"
    }
  ],
  "occupationCategory": "it_software",
  "recruitingCategory": "Festangestellte (IT)"
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