Senior Software Engineer (f/m/d) Managed NFS

Ionos; Berlin; Hybrid; EUR 90,000 - 130,000; Full time

Benefits offered by this job

Hybrid working model

Flexible hours

Canteen subsidy (at some locations)

Modern office with good transport

Employee discounts

Job summary

1&1 IONOS SE is hiring a highly skilled Go/Kubernetes expert to develop and maintain the NFS product within IONOS Cloud. You will build Operators, design high-availability features, and ensure reliability in a distributed storage environment.

Responsibilities include tackling complex issues, migrating legacy components safely, and collaborating across teams. A strong Linux background and experience with GitOps are required, with security clearance possible.

Qualifications

• Expert Go skills with several years of professional development.
• Experience developing Kubernetes Operators.
• Solid knowledge of NFS and SMB/CIFS, plus ZFS/DRBD.
• Experience building highly available, redundant systems with replication.
• Deep Linux knowledge, including kernel, LinuxKit and VM tooling.
• Fluent in Git, Docker, shell and CI/CD; GitOps workflows (ArgoCD).
• Observability experience with Prometheus and Grafana.
• Daily use of AI coding assistants in development work.
• Strong analytical, problem-solving, and independent working style.
• Willingness to undergo security clearance (SÜ-2).

Responsibilities

• Develop and maintain the NFS product for IONOS Cloud.
• Build and extend Kubernetes Operators to manage the product lifecycle.
• Design features to keep service highly available and redundant, including failover.
• Improve product reliability and replication.
• Analyze and resolve complex issues in distributed storage.
• Migrate legacy components step-by-step without breaking customers.

Skills

Go programming

Kubernetes

Kubernetes Operators

NFS/SMB/CIFS

Linux kernel

Git/Docker/CI

GitOps (ArgoCD)

Observability (Prometheus/Grafana)

AI coding assistants

Problem solving

Tools

Git

Docker

CI/CD

ArgoCD

Prometheus

Grafana

libvirt/QEMU

Cloud-init

Job description

Tasks

IONOS Cloud offers NFS as a managed service, and you develop and maintain it. The product is highly available and redundant, so customer data stays accessible even when a component fails. It runs on Kubernetes and is written mostly in Go.

Tasks

• Develop and maintain the NFS product for IONOS Cloud.
• Build and extend Kubernetes Operators that manage the product's lifecycle.
• Design and implement features that keep the service highly available and redundant, including failover.
• Improve the product's reliability and replication.
• Analyze and resolve complex issues in a highly available, distributed storage setup.
• Migrate from legacy components step by step, without breaking existing customers.

Qualifications

• Expert Go skills and several years of professional development experience.
• Experience developing Kubernetes Operators.
• Solid knowledge of NFS and SMB/CIFS, plus experience with ZFS and DRBD.
• Experience building highly available, redundant systems, including replication, failover and distributed-systems fundamentals (idempotency, retries, consistency, failure handling).
• Deep knowledge of Linux, including the kernel, and experience with LinuxKit and VMs (libvirt, QEMU, cloud-init).
• Fluency with Git, Docker, shell and CI/CD, including GitOps workflows (for example ArgoCD).
• Experience with observability tools (Prometheus, Grafana) to monitor availability and troubleshoot issues.
• Daily use of AI coding assistants (for example Claude) in your development work.
• Strong analytical and problem-solving skills and a structured, independent way of working in a team.
• Willingness to undergo a security clearance (SÜ-2).

Benefits

• Hybrid working model.
• Flexible working hours through trust-based working hours.
• At some locations a subsidized canteen and various free drinks.
• Modern office space with very good transport connections.
• Various employee discounts for activities and products.
• Employee events such as summer and winter parties, as well as workshops.
• Numerous training and development opportunities.
• Various health offers, such as sports and health courses.