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

Your mission

Who we are: We are simple system – a fast‑growing B2B SaaS company based in Munich and Cologne, developing industry‑leading procurement software incl. a state‑of‑the‑art B2B marketplace for mid‑sized businesses across Germany, Austria, and Switzerland. With 23 ,000+ monthly users , 850+ suppliers and partners , €150M+ in platform transaction volume and a40-person team , we are building the next generation of B2B commerce. And we’re just getting started.

Team & Technology: The engineering team works closely with business and product, has an impact on the product development roadmap and full autonomy of the tools and technologies used. At simple system we build the best product in the market by fighting for the best solution internally – the engineering perspective being on eye level with the business and product perspective . Our B2B solution has been designed and developed according to modern methodologies and principles. You will be joining across‑functional team of very experienced engineers , who believe in making great products and have all the technical skills to make it happen. Occasionally, we meet together to discuss the most important project matters and get to know each other during project workshops (on‑site in Warsaw or Munich). Our technology stack: Spring Boot, PostgreSQL, Elasticsearch, MongoDB, Kafka, ArchUnit, AWS S3, CloudWatch, EKS, Prometheus, Alertmanager, Grafana, Kubernetes, GitHub Actions, Terraform, Ansible, Cypress.

Your part: As a Java Developer, you will be responsible for the design and development of the backend services of the system. You will be joining a cross‑functional team of very experienced engineers, who believe in making great products and have all the technical skills to make it happen. You will leverage AI smartly in your day‑to‑day work and as a powerful building block in customer‑centric feature development.

Your profile

Requirements:

• 5+ years of professional experience building modern web applications
• Good command of recent Java versions (preferably 19+)
• Good knowledge of Spring Boot (preferably 3+)
• Ability to make design decisions that result in correct, reliable, performant & scalable systems
• Experience with Scrum / Agile environment
• Be open and willing to learn from mistakes
• Fluent in English

Nice to have:

• Hands‑on experience with ElasticSearch, MongoDB or Kafka
• Experience with AWS or Kubernetes
• Experience with Kotlin

Why us?

• We’re a no‑nonsense, “roll‑up‑your‑sleeves” team with a deep sense of ownership and customer focus
• We offer real responsibility and entrepreneurial freedom - you’ll shape not just our tech stack, but our company’s future
• We operate with flat hierarchies , fast decisions and high transparency
• We’re backed by a single strategic investor and have an ambition to become the dominant player in procurement software for mid‑sized companies in Europe
• We have an awesome team that loves working together

Location & Benefits

• Location: Munich‑Pasing
• Hybrid setup: In‑office days on Tuesdays & Wednesdays, flexible working hours
• Top‑tier work equipment
• Multisport membership
• Free breakfast & lunch in our in‑house canteen
• Attractive compensation
• Regular company updates and team‑building activities
• Individual career path and regular feedback every 6 months

You’ll be part of an international team where you can use your creativity and enjoy a fun working environment. If communication in English and GIFs, flat organization structure, and permanent challenges make you feel like a kid in a candy store, let’s talk.