Senior Fullstack Engineer (m/f/d)

LOCATION: Stuttgart, Munich, Hamburg (hybrid remote work possible)
START: Immediately

Blockbrain is a secure, AI-powered B2B SaaS platform that extends human knowledge with responsible AI. We help companies develop customized GenAI systems to access and leverage knowledge faster, automate a variety of knowledge-intensive tasks, and protect sensitive data—on our no-code platform or via API. Security is built in from the start: we comply with GDPR, ISO 27001, and EU AI law. Our VC-backed team brings decades of experience in AI, B2B SaaS, big data, automation, and data security.

We are seeking a highly motivated and entrepreneurial Senior Full Stack Engineer to join our dynamic team. This role is pivotal in driving the development, scalability, and reliability of our full stack technology landscape, with a strong emphasis on TypeScript across backend and frontend (using Hono, Node.js, and Nest.js for backend services, and Next.js with React for frontend). You’ll also work with Python (FastAPI) in the backend to support diverse services. As a senior engineer, you’ll apply core software engineering principles (e.g., SOLID, design patterns, clean code) to build robust, maintainable systems. Additionally, you’ll handle DevOps and infrastructure topics, including Kubernetes orchestration, runtimes, and cloud management, to ensure seamless operations. The ideal candidate has broad database expertise—including general SQL databases (e.g., PostgreSQL, SQLite) for versatile data handling—alongside NoSQL/graph databases and knowledge graph approaches to advance our intelligent data integrations and AI features.

• Full Stack Development : Design, develop, and maintain scalable backend services using TypeScript with Hono, Node.js, and Nest.js, as well as Python with FastAPI. Build and enhance frontend applications using Next.js, React, and web components, focusing on performance, security, and user experience.
• Software Design and Principles : Apply advanced software engineering practices, including SOLID principles, design patterns (e.g., MVC, Factory, Observer), refactoring for clean code, and strategies for scalability, modularity, and testability. Mentor junior engineers on best practices and conduct code reviews to maintain high standards.
• DevOps and Infrastructure : Manage and optimize our Kubernetes-based infrastructure, including container runtimes (e.g., Docker), orchestration with ArgoCD (App of Apps), and deployments on AWS. Use Terraform for infrastructure as code, implement CI/CD pipelines, and handle monitoring, scaling, and troubleshooting of production environments.
• Database and Data Management : Work with a range of databases for efficient data modeling, querying, and retrieval, including general-purpose SQL databases (e.g., PostgreSQL, SQLite), NoSQL databases (e.g., MongoDB), and graph databases (e.g., Dgraph). Ensure data integrity, performance, and seamless integration in complex, multi-database systems.
• API Development : Design and maintain REST APIs and GraphQL endpoints, focusing on secure, efficient integrations that support full stack functionalities and leverage knowledge graph approaches for advanced data querying.
• AI and Knowledge Graph Integration : Collaborate on training and deploying fine-tuned AI models, leveraging LLMs for vector search and graph-based retrieval. Contribute to the evolution of our knowledge graph approaches, ensuring robust data integration, semantic querying, and intelligent features across our stack.

• Experience : Minimum 5-8 years in full stack development, with proven seniority in leading complex projects from conception to production.
• Technical Stack : Strong proficiency in TypeScript across the stack; backend experience with Hono, Node.js, Nest.js, and Python (FastAPI); frontend expertise in Next.js, React, and web components.
• Software Engineering Principles : Deep understanding of general software design principles (e.g., SOLID, DRY, KISS), design patterns, clean architecture, unit/integration testing, and building maintainable, scalable systems.
• Databases : Broad expertise in database technologies, including general-purpose SQL databases (e.g., PostgreSQL, SQLite) for relational data handling and querying; NoSQL (e.g., MongoDB); and graph databases (e.g., Dgraph) with knowledge graph approaches for semantic data modeling, indexing, and optimized retrieval.
• API Expertise : Hands-on experience developing and optimizing REST APIs and GraphQL schemas.
• DevOps and Infrastructure : Proficiency in Kubernetes (including runtimes, pods, services, and scaling), ArgoCD, AWS services, Terraform for IaC, and tools for CI/CD, logging, and monitoring (e.g., Prometheus, ELK stack).
• AI/ML Familiarity : Experience with LLMs, vector embeddings, graph-based retrieval, knowledge graph approaches, and integrating AI into production systems.

• Entrepreneurial Mindset : An independent problem-solver who enjoys mentoring others and driving initiatives.
• Resilient and Goal-Oriented : You set ambitious goals and have a track record of achieving them in challenging environments.
• Courageous Innovator : Eager to propose new ideas, experiment with emerging tech, and learn from failures.
• Pragmatic Executor : Bias for action, with excitement about rapid iteration and delivering value quickly.
• Communicative : Confident in speaking up, collaborating cross-functionally, and communicating technical concepts clearly. Fluency in English is required; German is a plus

Join a fast-growing company at the forefront of AI-powered knowledge management.

• Growth opportunities: Significant opportunities for professional growth and development. Work alongside successful serial entrepreneurs and technology experts.
• Hybrid work: Flexible work structure.
• Culture: A flat hierarchy with unfiltered feedback loops.
• International: A global environment with regular team events and offsite meetings.
• Compensation: Competitive compensation package with upward potential.

If you are passionate about contributing to our mission and would like to help shape a

growing deep tech AI startup, we look forward to receiving your application. Please

send your resume and a short cover letter to: dominik@theblockbrain.ai.

Blockbrain is an equal opportunity employer. We celebrate diversity and are committed to an inclusive work environment.