Senior Backend Engineer, App (m/f/d)

Job Description

About your tasks:

• Play an active role in developing new features for mobile app users, designed with high performance and scalability in mind.
• Collaborate with app engineers to define API contracts and optimize data flows.
• Drive backend performance through testing, monitoring, and robust CI/CD practices.
• Architect and develop event-driven microservices using RabbitMQ.
• Build and evolve our Backend for Frontend (BFF) layer to meet mobile-specific needs.
• Ensure software quality through automated tests (TDD/BDD preferred).
• Participate in architectural discussions and technical decision-making.
• Engage in a culture of feedback, openness, and team collaboration.

Qualifications

About you:

• You demonstrate seniority through impact, proactivity, and ownership, not just years of experience.
• You have proven expertise in TypeScript, Node.js, and Nest.js, with hands-on experience delivering production systems focused on API-first and scalable architectures.
• You are comfortable with Python, with bonus points for experience in AI/ML-powered personalization or recommendation systems.
• You possess a DevOps mindset, with experience using Docker, Kubernetes, and CI/CD pipelines.
• You are experienced in building robust APIs and event-driven architectures.
• You are familiar with security best practices (OAuth2, JWT, encryption, secrets management) and observability tools.
• You value clean code, strong test coverage, and continuous improvement.
• You thrive as a team player in a feedback-driven, collaborative culture.

Additional Information

About your benefits:

In order to provide our employees with the best possible support for their individual needs, we offer a wide range of benefits:

• Sports: Stay healthy. Profit from a membership (M) package at Urban Sports Club, so that you can take advantage of a huge variety of sport offers.
• Mental Health: Get quick and professional help from psychologists of Likeminded if you feel overwhelmed in private or professional life. Anonymous and free of charge.
• Work from Home: If your job does not require you to be present in the office, we can arrange the place you work from individually - even for up to 20 days a year anywhere in the EU.
• Mobility: We provide our employees with a fully costed Deutschland Ticket which can be used at any time. Click here to learn more.
• Personal development: Grow! We support and encourage your individual development through various in- and external trainings.
• And many more :)

Remote work policy:

Our offices are open, but you are free to work from home, from any location in Germany. It is entirely up to you if you want to pop into the office every now and again, or if you work from home all the time. At the same time, we value relationship between all members of the area and therefore we have regular team and area anchor days on which every team member is asked to come to the office.