Senior Backend Engineer - AI Systems (m/f/x)

Your tasks

We are seeking a Senior Backend Engineer to design and build the backend layers that power our platforms, with a focus on secure APIs, data processing pipelines, and resilient storage systems. You will play a key role in shaping our backend architecture, ensuring it is robust, scalable, and secure. This role requires both technical leadership and hands‑on implementation, working closely with cross‑functional teams to deliver end‑to‑end solutions.

You’ll collaborate closely with Frontend Developers, Data Scientists, AI Engineers, and Product Managers to deliver seamless end‑to‑end solutions.

In this role, you will have the opportunity to:

• Design, develop, and maintain secure, scalable backend services, APIs, and microservices.
• Architect and implement backend layers including API Gateway & Load Balancer, AI Agent layer, Data Intelligence, Data Extraction, and Data Storage.
• Build resilient Python services with frameworks like LangGraph, Celery, PydanticAI, and enforce typed schemas for data quality.
• Implement event‑driven processing and long‑running job orchestration with retries, backoff, and idempotency.
• Develop integration points with external connectors/SDKs and ensure validation at ingestion.
• Optimize backend components for performance, reliability, and cost efficiency at scale.
• Work with diverse data stores (e.g., Elasticsearch, Neo4j, DynamoDB, MySQL) ensuring fit‑for‑purpose storage, security, and compliance.
• Implement monitoring, observability, and tracing for backend pipelines (Prometheus, Grafana, centralized logging, Langfuse, Arize Phoenix).
• Collaborate with frontend, AI/ML, product, and infra teams to deliver seamless solutions.
• Document backend architecture, APIs, and workflows for internal reference and onboarding.
• Stay current with backend/cloud technologies and recommend improvements.

Your profile

• 5+ years of professional experience in backend software development, with deep expertise in Python.
• Proven experience building scalable backend systems with Python services, Celery workers, event‑driven architectures, and API Gateway/ALB.
• Solid understanding of microservices patterns, event‑driven systems, and schema validation with tools like PydanticAI.
• Hands‑on experience with SQL and NoSQL databases (MySQL, DynamoDB, Neo4j) and search engines (Elasticsearch).
• Familiar with Infrastructure as Code (IaC) and CI/CD pipelines for safe, automated releases.
• Strong grasp of software engineering principles, security best practices, and data lifecycle management.
• Experience with observability and monitoring tools (Prometheus, Grafana, centralized logging, Langfuse, Arize Phoenix).
• Comfortable working with Git‑based workflows in collaborative environments.
• Excellent problem‑solving and debugging skills.
• Strong communication and collaboration abilities.
• Strong communication and collaboration abilities, with effective written and spoken English.

Bonus Qualifications

• Experience with Docker and container orchestration.
• Knowledge of cloud‑based AI services (e.g., Amazon Bedrock, Azure AI Foundry) and RAG quality frameworks (RAGAS).
• Familiarity with graph‑based queries and hybrid search use cases.
• Exposure to DevOps or SRE practices, including blue/green deployments, WAF/caching at the edge, and automated rollbacks.

Why us?

At Beroe X nnamu GmbH , we prioritize a balanced work‑life experience.

Here’s what we offer you:

• 4‑Day Work Week & up to 24 Days Paid Vacation – More time to recharge
• Monthly Benefits Allowance – €40/month in vouchers for fitness and other perks with Probonio
• Competitive Compensation – Fair salary and comprehensive benefits.
• Flexible Work Arrangements – Work the way that suits you.
• Professional Development – Access to training and certifications.
• Team Events – Bi‑annual company events and Quarterly team lunch get‑togethers.
• Work Abroad Flexibility – Remote work from the EU or selected non‑EU countries for up to 8 weeks a year with travel insurance coverage

We operate on a hybrid model with offices in Berlin and Munich, offering a 32‑hour, 4‑day workweek.

This means:

• In‑Office Collaboration : Work from the office two days a week
• Manage Your Own Hours : Flexibility to work around your needs as long as team goals are met.

Our Culture

We are committed to fostering a collaborative, innovative and inclusive work environment where everyone’s ideas matter. We know that diverse teams lead to better outcomes and welcome applicants from all backgrounds.