Senior Backend Engineer (m/f/d)

Your mission

About BuildingMinds: 
 
BuildingMinds is a leading AI data-driven ESG platform designed to empower asset owners and operators in today’s fast-paced, sustainability-focused environment.   
  
A single, centralized, and secure platform, BuildingMinds is transforming the way real estate leaders manage ESG and decarbonization initiatives with data-driven insights and compliance solutions. 
     
We are looking for best in class talent who are driven and natural-born disruptors to join our team.  
   
How we work…   
Being on the forefront of disrupting an entire industry, we offer the freedom to be creative and forward-thinking. As a start-up in Berlin and with the full backing of Schindler, we also have the stability, support and resources of an established world leader in the buildings industry. This enables us to bring together the best of two worlds and to create an utterly unique culture of creativity, accelerated innovation and learning. We value speed, agility and creativity.

Your profile

We are looking for a Senior Backend Developer to join our team in building and maintaining cloud-based B2B SaaS applications. You will work closely with cross-functional teams to design scalable solutions, optimize performance, and deliver high-quality backend services using modern technologies. 

What you will be doing: 

• Design, develop, and maintain cloud-based B2B SaaS applications using NestJS, TypeScript, and microservices architecture.
• Implement RESTful APIs to enable efficient data exchange for the platform and provide integration capabilities for external clients, adhering to OpenAPI standards.
• Design and build distributed systems, utilizing event-driven communication with Apache Kafka.
• Handle large volumes of data and perform complex data transformations to ensure performance and scalability.
• Optimize system performance by identifying and addressing bottlenecks, with a focus on database design and optimization (PostgreSQL, MSSQL).
• Collaborate with front-end developers to integrate backend logic with front-end components, ensuring seamless functionality.
• Write clean, maintainable, and scalable code following SOLID principles and industry best practices.
• Continuously improve system architecture, reduce technical debt, and introduce new features while maintaining code quality.
• Contribute to the adoption of agile methodologies and promote collaboration across the team.

We would like to hear from you if you have: 

• 5+ years of backend development experience, particularly with Node.js frameworks, preferably NestJS.
• Proficiency in building RESTful APIs and cloud-native applications.
• Familiarity with agile development practices in a fast-paced environment.
• Strong expertise in database design, optimization, and working with PostgreSQL and MSSQL.
• Experience with Kafka for building event-driven architectures and managing real-time data streams.
• Experience in handling large datasets and performing complex data transformations for scalable applications.
• Hands-on experience with Docker and containerization.
• Strong understanding of DevOps principles and practices integrated into development workflows, including experience with CI/CD pipelines for automated testing and deployment.
• Passion for writing clean, efficient code and continuously improving existing systems.
• Strong problem-solving skills and a pragmatic approach to technical challenges and decision-making.
• Fluent communication skills in English.
• We are also open to applications outside of Germany, but must be based in the CET time zone

Why us?

We offer you:   

• Opportunity to work with a diverse team with people from all over the world, of all ages with a supportive atmosphere.  
• Annual learning budget focusing on people professional and personal de