Staff Backend Engineer (f/m/d)

About Us:

Customer Alliance is a remote-first SaaS company based in Berlin, focused on hospitality tech. We help businesses build trust and grow by capturing, analyzing, and acting on customer feedback. Our platform provides actionable insights for the hospitality, healthcare, and automotive industries. We are an international team of curious and passionate individuals who value feedback, ownership, and continuous improvement.

You'll thrive here if:

• You value impact.
• You believe great ideas can come from anywhere.
• You take ownership and enjoy solving hard problems.
• You want to grow with a team that's ambitious but humble.

If you are excited to collaborate with a diverse, international team that values feedback, ownership, and improving customer experience, this is the place you will fit right in.

What you will do:

In this role, your primary impact will come from technical leadership and platform evolution, ensuring our long-lived SaaS remains reliable, scalable, and adaptable as the product grows.

• Shape the future of a B2B SaaS platform, balancing long-term vision with incremental improvements.
• Lead large-scale refactorings and modernization efforts.
• Design and evolve backend architectures across different services, with a focus on scalability, reliability, and operability.
• Build and maintain scalable backend services using PHP 8.5 (Symfony 7) and Scala.
• Drive architectural decisions around APIs, data models, and service boundaries, making trade-offs explicit and well-documented.
• Act as a technical reference for complex debugging and system-level issues.
• Mentor and support other engineers through code reviews, technical discussions, and hands-on collaboration.
• Contribute to evolving our engineering culture through knowledge sharing and technical leadership.

What We're Looking For:

• 8 years of professional experience in backend engineering, with experience evolving established systems.
• Strong expertise in PHP (preferably using Symfony framework) and solid experience working with complex, long-lived codebases.
• Proven ability to lead major refactorings or architectural transitions.
• Deep understanding of SQL, data modeling, and performance trade-offs.
• Strong debugging and system-level thinking skills.
• Hands-on DevOps experience, with a strong sense of ownership for production systems: CI/CD, monitoring, alerting, deployments, and production troubleshooting.
• Experience working with distributed systems and service-oriented architectures.
• Ability to mentor engineers with different experience levels through clear technical guidance and constructive feedback.

Nice to have:

• Experience building GenAI systems.

Our stack:

• HTML5, (S)CSS, JS, VueJS, Nuxt
• Symfony 7.4 with Doctrine ORM
• PHP 8.5
• Scala
• Mysql
• Redis
• RabbitMQ
• ElasticSearch
• Nginx, Varnish
• Docker
• Linux

What We Offer:

• Remote within Germany, or hybrid work from our dedicated Mindspace office in central Berlin (Hausvogteiplatz, Mitte).
• Full membership at Mindspace (co-working), allowing you to work from any of their locations.
• Budget to bring remote team members together and work in person.
• Work with highly experienced and capable people motivated to build great products.
• Earn extra vacation days each year (Start 26 days, Max 34 days).
• FitX gym membership, available at all locations.