Senior Backend Software Engineer - (m/f/x)

Beroe x nnamu GmbH; München; Hybrid; EUR 85.000 - 130.000; Vollzeit

Benefits dieser Stelle

4-Day Work Week

Up to 24 days vacation

€40 monthly benefits allowance

Flexible work arrangements

Team events

Travel insurance

Zusammenfassung

Beroe X nnamu GmbH is hiring a Senior Backend Software Engineer to design, build, and scale backend systems for an AI-driven negotiation platform. You will work with product managers, frontend and data teams to deliver robust, secure services and data models.

The role emphasizes serverless AWS workflows, Hexagonal architecture, and high availability. Hybrid work model with offices in Berlin and Munich, plus remote options for flexible scheduling.

Qualifikationen

• 5+ years of professional backend development experience in production
• Expert-level Python proficiency with FastAPI
• Experience with Hexagonal/Clean architecture patterns
• Strong experience with AWS serverless services (Lambda, Step Functions, API Gateway)
• Hands-on with AWS SAM for deployment
• DynamoDB data modeling and access patterns
• Experience with AWS Cognito authentication/authorization
• Experience with SES for transactional messaging
• Familiarity with IoT Core and event-driven architectures
• Version control with Git (GitLab/GitHub)
• Familiarity with Agile, CI/CD, and automated testing
• Strong technical specification writing and clear documentation
• Excellent communication, collaboration and ownership

Aufgaben

• Architect, develop, and maintain scalable backend services using Python and FastAPI
• Design and build serverless applications with AWS Lambda, Step Functions, and API Gateway
• Model and manage data using DynamoDB with efficient access patterns
• Implement secure authentication and authorization via Cognito
• Build event-driven workflows using Step Functions and SES
• Integrate IoT Core for device connectivity and real-time data ingestion
• Ensure code quality through reviews, tests, and best practices
• Collaborate with cross-functional teams to deliver end-to-end solutions
• Write unit, integration, and end-to-end tests to ensure quality and maintainability

Kenntnisse

Python

FastAPI

Hexagonal architecture

AWS Lambda

Step Functions

API Gateway

DynamoDB

AWS Cognito

SES

IoT Core

Git

CI/CD

Automated testing

Technical documentation

Communication

Tools

Docker

Terraform

AWS CDK

AWS SAM

Jobbeschreibung

Your tasks

We are looking for a Senior Backend Software Engineer to join our cross-functional product team. You will play a pivotal role in designing, developing, and scaling the backend systems that power our AI-driven negotiation platform. You'll work closely with product managers, frontend engineers, and data teams to build robust, secure, and highly available services.

Key Responsibility:

• Architect, develop, and maintain scalable backend services using Python and FastAPI, following Hexagonal (Ports & Adapters) architecture principles.
• Design and build serverless applications using AWS Lambda, Step Functions, and API Gateway.
• Model and manage data using DynamoDB, ensuring performant and cost-effective access patterns.
• Implement secure authentication and authorization flows using Cognito.
• Build event-driven and asynchronous workflows using Step Functions and SES for transactional messaging.
• Integrate with IoT Core to support device connectivity and real-time data ingestion.
• Ensure code quality through code reviews, automated testing, and adherence to best practices.
• Collaborate with cross-functional teams to define and deliver complete, end-to-end solutions.
• Write comprehensive unit, integration, and end-to-end tests to ensure code quality and maintainability.

Your profile

• 5+ years of professional experience building and maintaining backend systems in production.
• Expert-level proficiency in Python, with hands-on experience using FastAPI.
• Hands-on experience designing systems using Hexagonal architecture (or similar patterns like Clean Architecture or Ports & Adapters).
• Strong experience with AWS serverless services: Lambda, Step Functions, API Gateway.
• Hands-on experience with AWS SAM (Serverless Application Model) for building and deploying serverless applications.
• Solid experience with DynamoDB or other NoSQL data stores, including data modeling and access pattern design.
• Experience with AWS Cognito for authentication and authorization.
• Experience with SES or similar services for transactional email/messaging.
• Familiarity with IoT Core or event-driven/IoT architectures.
• Proficient with version control systems such as Git (GitLab, GitHub).
• Familiarity with Agile development methodologies, CI/CD pipelines, and automated testing.
• Strong technical spec writing skills, with the ability to translate requirements into clear, actionable documentation.
• Excellent communication skills, a collaborative mindset, and a strong sense of ownership.

Bonus Qualifications

• Experience with Infrastructure as Code tools beyond SAM (e.g., Terraform, AWS CDK).
• Exposure to event-driven architectures and messaging systems (e.g., SQS, SNS, EventBridge).
• Experience with other cloud platforms (e.g., Azure, Google Cloud Platform) in addition to AWS.
• Experience using AI tools for development to boost productivity
• Integrating AI/LLM capabilities into backend systems.
• Understanding of observability practices (logging, tracing, monitoring) in distributed/serverless systems.
• Experience with containerization (Docker) and orchestration.
• Interest or experience in game theory, negotiation systems, or applied AI/ML backends.
• Experience working in regulated or high-security environments (data privacy, compliance).

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.