Our mission is clear: to actively drive the energy transition forward. At the same time, we foster collaboration, diversity, and continuous learning.

We believe software engineering will change more in the coming years than it has in the last twenty. AI-assisted and agentic development will play a central role in this transformation. As an engineering organization, we want to actively shape this future and are looking for people who enjoy working on both stable production systems and the evolution of modern engineering practices.

We are looking for an experienced Senior Platform / DevOps Engineer to take ownership of platform stability, operations, automation, and continuous improvement.

This is a hands-on senior engineering role for someone who thrives in complex environments. You do not need to know every tool in our stack from day one. What matters most are strong fundamentals in Kubernetes and Linux, experience operating production systems, structured troubleshooting skills, and the ability to quickly learn and navigate unfamiliar systems.

You will not only operate the platform—you will help shape it for a future in which developers increasingly collaborate with AI agents.

Your Responsibilities

• Treat the platform as an internal product and continuously improve it, working closely with development teams to enable efficient, standardized, and self-service workflows, as well as systems that are easy to deploy, support, and operate.

• Take ownership of the stability and operation of core platform and infrastructure components.

• Contribute to containerization, infrastructure, automation, and CI/CD processes based on Docker and Docker Compose to ensure stable, standardized, and repeatable operations.

• Critically assess existing systems, processes, and architectures with a focus on risks, weaknesses, and opportunities for improvement.

• Standardize and gradually consolidate evolving platform structures.

• Create and maintain technical documentation, runbooks, operational procedures, and architecture overviews.

• Prepare for and support internal and external audits by establishing transparency, traceability, and compliance-oriented documentation.

• Advance monitoring, alerting, observability, and operational transparency, including establishing and standardizing observability practices based on OpenTelemetry and Prometheus.

• Several years of experience in DevOps, Platform Engineering, Site Reliability Engineering (SRE), or a comparable infrastructure-focused role.

• Strong hands-on experience with Kubernetes, Linux, containers, and production operations.

• Experience with incident response, production debugging, monitoring, logging, and operational decision-making.

• Solid understanding of CI/CD, deployment automation, and infrastructure automation.

• Ability to work within complex system landscapes, identify root causes, and implement sustainable improvements.

• Strong English communication skills and willingness to collaborate regularly with the team in Berlin.

Nice to Have

• Experience with different cloud or IaaS provider environments.

• Experience with Infrastructure as Code and deployment tooling.

• Experience with observability, logging, or metrics platforms.

• Experience with platform networking, service routing, authentication, or access management.

• Experience with backup, recovery, database, or storage-related operational topics.

• German language skills for day-to-day collaboration.

We welcome applications from people with diverse backgrounds, experiences, and perspectives.

Lumenaza stands for clear values: sustainability, diversity, and collaboration. We take pride in our diverse team and are committed to supporting women in tech.

You will receive thorough onboarding into the energy market processes and gain access to an exciting, future-proof industry. We know how complex the energy market can be, which is why we actively share our expertise to ensure you can succeed, regardless of your previous experience in the sector.

We invite you to join our growing development team as a Senior QA Engineer (m/f/d) in Berlin.

• At least 5 years of experience as a QA Engineer or Software Engineer in Test

• Excellent knowledge of functional and non-functional testing methods (e.g., end-to-end, greybox, load, and performance testing)

• Strong Python skills

• Experience with test suites (e.g., Selenium, Pytest, Cypress, Jest, Playwright)

• Experience in automation and integration of tests (e.g., Robot Framework, Behave, Mocha, TestNG)

• Familiarity with infrastructure tools for test environments (e.g., Docker, Docker Compose, Kubernetes)

• Proficient in CI/CD pipelines and test integration (e.g., GitLab CI, CircleCI, Jenkins)

• Knowledge of bug tracking and reporting tools (e.g., Jira)

• Analytical thinking and a structured work approach

• Excellent communication skills in German and English

• Passion for clean code, automation, and modern testing methodologies

• Experience working with Linux systems

• Basic understanding of the German energy market and regulatory requirements

• Knowledge of common frameworks (e.g., Django, FastAPI, Flask, …)

• Experience with reporting tools such as Allure or ReportPortal

• Comprehensive onboarding and training:
  New team members are supported through tailored training programs to expand their skills and expertise.

• Flexibility for a better work-life balance:
  Enjoy flexible working hours and the option to work from home part of the week, helping you balance work and personal life effectively - two days a week in the Berlin office and three days remotely.

• Attractive additional benefits:
  In addition to fair pay, we offer perks such as a discounted electricity tariff and a reduced-price Deutschlandticket.

• Modern work environment:
  Our office in Berlin-Kreuzberg provides an inspiring workspace that fosters creativity and productivity.

• Innovation at the heart of the energy transition:
  Join our team at the forefront of energy innovation and help revolutionize the industry.

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.

As a Senior Backend Engineer, you will design and build core systems that power real-world energy processes — from billing to market communication.

You take ownership of complex domains, contribute to architectural decisions, and help evolve both our systems and engineering practices.

What You’ll Do

• Build and own core backend systems
  Design and implement scalable solutions for billing, tariff models, and energy market processes.

• Shape system architecture
  Work across the full lifecycle — from design to deployment — ensuring maintainability, scalability, and correctness.

• Solve complex technical challenges
  Develop robust solutions involving data modeling, asynchronous processing, and distributed systems.

• Collaborate across disciplines
  Work closely with Product, Frontend, and DevOps to deliver cloud-based solutions and improve our platform.

• Drive improvement and innovation
  Bring in new ideas, improve engineering practices, and explore modern development approaches, including AI-assisted workflows.

• Modernize existing systems
  Help evolve and migrate legacy systems toward modern architectures.

• 5+ years of backend development experience

• Strong Python and Django expertise

• Experience designing and building REST APIs

• Experience with distributed systems / microservices

• Solid understanding of databases (PostgreSQL)

• Experience with Docker and CI/CD workflows

• Strong communication skills in English

Nice to Have

• Experience with FastAPI, Pydantic, or Django Ninja

• Knowledge of Celery or similar async tools

• Experience integrating external systems (e.g. ERP, APIs)

• Familiarity with React / TypeScript

• Interest in energy markets or regulated domains

We deploy continuously to Kubernetes and work with distributed systems handling complex, business-critical data.

We strongly encourage applications from underrepresented groups in tech and are committed to building an inclusive environment.