Senior Backend Engineer / Architect (m/f/d)

Bonrepublic is an HR software platform that combines goals, recognition, development and incentives to motivate and retain employees. We dream of a world in which the development of employees in organizations is systematically promoted and strategically managed. Bonrepublic was founded in 2020 and has already made this dream a reality for employees across Europe. To drive our dream further, we are looking for support for our team of 25 employees in our Vienna office.

As the newest part of the HR WORKS group, we work entrepreneurially in close collaboration with the HR WORKS team. This means for you: you'll be part of a 220-person team, benefit from our interdisciplinary network, and have the opportunity to connect across our four locations in Vienna, Freiburg, Frankfurt, Berlin, and Cologne.

Your Mission

• Build and improve backend services: Develop and maintain our SaaS backend using Python, Django, Django REST Framework, and FastAPI, while exploring and introducing modern, scalable technologies such as Go, Java, or NestJS where they add value
• Apply architectural best practices: Use Domain-Driven Design, modular monolith (Modulith), microservices principles, and hexagonal architecture to keep our codebase scalable and maintainable
• Design event-driven systems: Work with e.g. RabbitMQ or Kafka to create scalable, asynchronous communication between services
• Optimize performance: Refactor existing systems, improve query efficiency in PostgreSQL, and ensure our APIs perform reliably at scale
• Maintain quality standards: Write clean, tested, and well-documented code; perform code reviews; share knowledge with peers
• Leverage modern tools: Use AI coding assistants and automation to speed up development and reduce repetitive work
• Collaborate in agile teams: Work closely with product, frontend, and QA colleagues in a Scrum/Kanban setup, contributing ideas and solutions

Your Profile

• Deep experience: 10+ years in backend software engineering, with strong expertise in Python/Django and familiarity with other backend languages or frameworks (e.g., Java, Go, Node.js/NestJS)
• Architectural mindset: Solid understanding of Domain-Driven Design, modular monoliths, microservices, and hexagonal architecture
• Messaging expertise: Hands-on experience with RabbitMQ or Kafka in production
• API skills: Proven track record in building and integrating RESTful APIs; FastAPI experience is a plus
• Database know-how: Strong PostgreSQL skills, from schema design to performance tuning
• DevOps awareness: Experience with Docker and Kubernetes is an advantage
• Agile mindset: Comfortable working in agile teams with excellent communication skills in English (German is a plus)
• Continuous learning: Open to adopting new tools, patterns, and approaches

Why us?

• Join our journey from startup success to enterprise excellence!
• The company offers the opportunity to develop services using the latest technology
• Shape the future, learn, and lead.
• The opportunity to learn the latest stacks and technologies on the job
• Benefit from the excellent expertise in the company, where top management comes together to share knowledge
• Internationally oriented company