Senior Cloud Infrastructure Engineer m/f/d

About ATOSS

ATOSS Software SE is one of Germany’s most successful tech growth stories. As the market leader in Workforce Management Software, we help companies work more intelligently, creatively, and humanely optimizing the balance between profitability and people.

We’re a rare company: according to Handelsblatt (10/24), just 309 public companies worldwide achieved over 20% return on sales for ten consecutive years. Only two are based in Germany and ATOSS is one of them.

With 20 years of record-breaking growth, over €2 billion market cap, and listings in SDAX and TecDAX, we’re scaling globally and we’re growing.

If you’re ready to drive impact in a high-performing B2B SaaS environment, this is your chance to elevate your career.

The Person You are At ATOSS, we hire for both character and skill , seeking individuals who embody resilience, a pioneering spirit, and the passion to grow.

We value those who

Think like entrepreneurs – taking ownership, pushing boundaries, and driving impact.

Challenge the status quo – bringing fresh ideas and bold execution to the table.

Thrive in change – seeing growth as a lifelong journey, both professionally and personally.

The Role

As a (Senior) Cloud Infrastructure Engineer in our Cloud Operations Services (COS) department, you own the core infrastructure and data platform behind the ATOSS Cloud Solution, across Azure and T Cloud Public. You administer and maintain services such as Kubernetes, database systems, storage, and network components, including our self-hosted data and identity services, and make sure everything can be backed up, restored, and secured. You work closely with Cloud Architecture, Security, and the other COS engineers.

Key Responsibilities

Infrastructure & workload operations

Plan, build, and operate the Azure and T Cloud Public infrastructure that the ATOSS Cloud Solution runs on, from compute and networking to storage. Administer Kubernetes clusters and containerized workloads on top of them. Own Day 2 operations: high availability, patching, and version upgrades across both clouds. Apply your knowledge of T Cloud Public and its OpenStack heritage, alongside Azure's native services, to day-to-day operations and troubleshooting.

Data, streaming & identity services

Operate Kafka for our event-driven and streaming use cases, including topics, partitions, and Schema Registry. Operate Redis, PostgreSQL, and SQL Server (Azure SQL): sizing, replication, backup, and performance tuning. Run Keycloak for identity and access.

Backup, recovery & resilience

Own backup and restore across the platform, using Velero for Kubernetes workloads and the native backup services of Azure and T Cloud Public. Investigate performance and stability issues across infrastructure and stateful services, and drive root cause analysis after incidents.

Security & cost management

Apply TLS/mTLS, RBAC , secrets management, and least-privilege access across the infrastructure and services you own. Keep an eye on cost: right-sizing, autoscaling, and storage or retention guardrails in line with FinOps practices.

AI infrastructure

Operate the data and vector stores that sit under our AI workloads, and provide the infrastructure capacity that AI services need. Work with the AI and Ops teams to bring new AI use cases into production without compromising reliability or security.

Key Requirements

Solid hands-on experience operating cloud infrastructure in production, on Azure and/or T Cloud Public. Strong Kubernetes experience, ideally AKS , including stateful workloads. Hands-on experience with several of: Kafka, Keycloak, Redis, PostgreSQL, SQL Server (Azure SQL), Velero. Infrastructure as Code (IaC) and GitOps experience for provisioning and lifecycle management. Solid understanding of networking and security fundamentals (TLS/certificates, RBAC , secrets management). Strong troubleshooting skills in complex, multi-cloud production environments. Experience with or genuine interest in operating infrastructure for AI workloads. Clear communication and a pragmatic, results-focused mindset. Fluent English; German is a plus.

Nice to have / Plus

Experience operating workloads on T Cloud Public (or its predecessor Open Telekom Cloud) and familiarity with its OpenStack heritage. Vector database experience (pgvector or similar) for AI and retrieval use cases. Experience with additional hyperscalers such as AWS. Relevant certifications (Azure, CKA / CKAD ).

Our Benefits

• Onboarding : HR Induction, Newbies-Day, Training for our internal products & Buddy-Program
• Benefits : meal vouchers, performance bonus, recommendation bonus, voluntary company bonus, free parking at our VOX Technology Park location in Timisoara, Bookster for bookworms, gaming rooms & rooftop access in Timisoara
• Company culture : flexibility through HYBRID working style (50% work from home), 23 vacations days from start, Diversity & Inclusion Team – culture talks, company event (Halloween/Christmas/ Summer party, team buildings), Barista corner in Timisoara, fresh fruit & sweets day after every release cycle, relocation package for those who wish to move to Timisoara/Sibiu
• Career and development: career model with Expert- & Leadership Track, LinkedIn Learning, German language course if department requires, Java and Scrum certifications
• Health Initiatives: medical subscription with a national-wide medical provider, 7Card for fitness activities, engagement events for employees
• Stability & Growth: Company listed on SDAX & TecDAX, with 19+ years of record-breaking revenue and a 30%+ EBIT margin. Certified Top Employer© for the 5th year in a row.
• 2 locations in Romania : TIMISOARA – VOX Technology Park | Calea Torontalului nr 69 | building B and SIBIU Str. Nicolaus Olahus | No.5 | Business Center Sibiu | Building B | Ground Floor
• Standard contract: CIM

At ATOSS, great talent knows no limits. We welcome professionals from all backgrounds and empower their growth through an inclusive, skill focused environment.

Join us and be part of a high-growth, future-focused company!