QA Engineer (m/w/d)

We are on the mission to build Europe’s leading energy management platform to provide fair, clean energy to everyone. ⚡

We’re a diverse team of 47+, with 47% being female and from 16+ nationalities, and steadily growing. Having raised a total of over €23 M, we are looking for passionate people to join us on our mission! 🚀

Your Mission

We are looking for a QA Engineer (Mid-level) to join our team. You’ll be a key member of our cross-functional product squads, ensuring the delivery of high-quality, user-focused software across our mobile and web platforms. As part of a cross-functional team, you will play a crucial role in upholding our commitment to quality by supporting our tech team in identifying and addressing software defects.

Your contributions will help ensure that our product meets the highest standards of performance, reliability, and user satisfaction.

You can view our full tech stack here.

• Be in the know: Open and transparent communication, from our weekly town hall, quarterly company updates, to retrospectives. Share your ideas — feedback goes both ways!
• Collaboration and connection: Success is shared, and collaboration gets us there. Success is also best celebrated together! So join in on our Friday happy hour, team and company events.
• You do you: Flexibility ensures everyone can work where is best for them. Office goer? Awesome. Working from home? Awesome. Working from Sardinia? Jealous.
• Try it: Our mindset is that we are learning together, with personalized development pathways, learning budgets, and company-wide knowledge sharing sessions. Give it a go and learn along the way.

What you will be working on

• Own mid-sized QA initiatives and lead test planning within your squad
• Initiate, Design and maintain automated UI and API test suites
• Write robust test cases covering edge cases, failure paths, and key user flows
• Perform manual and automated testing for new features and releases
• Collaborate with developers and product managers to scope QA efforts and identify risks early
• Suggest process improvements and help resolve recurring quality issues
• Participate in sprint planning and kick-offs, contributing test strategies and timelines
• Support release monitoring using observability tools and metrics
• Mentor other QA team members through pairing, reviews, and documentation
• Share knowledge and help foster a strong, collaborative QA culture

What we're looking for

• 3+ years of experience in software QA, across both manual and automated testing
• Skilled in writing and maintaining test automation for mobile applications
• Solid understanding of SDLC, Agile practices, and the testing pyramid
• Proficient in API testing (e.g., Postman) and testable code practices
• Familiar with SQL and database testing, especially PostgreSQL
• Confident with Git, CI pipelines, and mobile test automation frameworks
• Strong communication and collaboration skills
• Ability to assess QA risk in terms of business impact and communicate clearly
• Eager to mentor, learn, and contribute to customer-focused product development

Nice to have

• Experience using observability tools for post-release validation

Why Us?

• Environmental Impact: Each customer who switches to Ostrom on average helps offset 1.5 tons of CO2 emissions per year compared to the average German energy mix
• Flexibility: We offer a hybrid work model with a dog-friendly office in Berlin, Mitte, in case you prefer working in the office.
• Relocation package: If you want to move to Germany, we offer a visa and relocation support.
• Trust-based Team: A truly flat hierarchy and transparent company culture, where everyone’s voice matters.
• Personal development: You receive an annual growth budget, encompassed with frequent development 1:1’s and development cycles held twice a year.
• Benefits: From monthly team events to discounted gym membership, ticket for public transport, e-Moped or e-Bike via Dance, Futurebens, and monthly vouchers.