Senior Site Reliability Engineer / SRE – Kubernetes & Hybrid Cloud (m/f/d)

FACT-Finder; Pforzheim; Hybrid; EUR 90.000 - 125.000; Vollzeit

Benefits dieser Stelle

Hybrid work model

Zusammenfassung

FACT-Finder is seeking an experienced Site Reliability Engineer to build and operate a modern, private cloud platform on Kubernetes and Harvester. You’ll collaborate with Berlin developers while two sysadmins in Pforzheim handle hardware, shaping reliability from the ground up.

You’ll define SLOs and drive automated, data-informed reliability decisions, joining a team that values observability, GitOps, and end-to-end incident response in a fast-paced eCommerce context.

Qualifikationen

• Must have Kubernetes in production and hands-on cluster lifecycle management.
• Strong SRE background with SLOs, error budgets, incident handling, on-call.
• Experience with GitOps and deployment automation; ArgoCD/Flux a plus.
• Solid observability skills: metrics, logs, traces, alerting trusted by teams.
• Strong automation mindset: fix root causes, reduce toil.
• Collaborative mindset: serve developers with transparent trade-offs.

Aufgaben

• Define and own SLOs, SLIs, and error budgets for reliable services.
• Lead end-to-end incident response with blameless postmortems.
• Automate toil away; evolve observability across stacks.
• Contribute to Kubernetes operator/CRD development for search clusters.
• Plan capacity, performance, and cost for on‑prem and cloud architectures.

Kenntnisse

Kubernetes in production

SRE practices

GitOps

Argo CD

Observability

Automation mindset

Collaboration

German language

Tools

Harvester

KubeVirt

vSphere/ESXi

OpenStack

Longhorn

Ceph

Argo CD

Flux

Prometheus

Grafana

KEDA

Jobbeschreibung

Introduction

At a glance

• Location &workmodel:Berlin, hybrid
• Tech stack:Kubernetes on our own servers, Harvester (KubeVirt), Argo CD/Flux, Prometheus/Grafana, Longhorn/Ceph
• Team:A growing SRE team – you report to our CTPO for now and to the Team Lead SRE we're hiring next; two system administrators in Pforzheim run the physical hardware
• Process:Intro call · take-home task (~2h) · 90-min tech interview with our developers · leadership conversation · meet the team
• Languages:Fluent English required; German is a plus, not a must

Why this role is special

Most SRE jobs today mean clicking around a managed cloud console. This one doesn't. We run our own hardware in Frankfurt and are building a modern private cloud platform on Kubernetes and Harvester – on-prem by default, with elastic burst into the public cloud and the option to go cloud-only later. You won't inherit a finished SRE practice: you'll help define it, side by side with our Berlin development teams – and you won't do it alone, a Team Lead SRE hire is coming next.

SRE here is an enabling discipline: you build what our developers need to ship reliably, while two system administrators in Pforzheim run the physical hardware. And the impact is direct – our product discovery technology powers more than 2,000 European online shops (Intersport, SPAR, Douglas and more), handling billions of shopper queries a year. When product discovery is slow or down, our customers lose revenue in real time.

Your first 90 days

You get to know both products, join the on-call rotation with a buddy, and own your first reliability topic – SLOs for one product, alerting that actually helps at 3 a.m., or automating away a piece of toil. By day 90 you've shipped visible improvements and know where you want to take the platform next.

Your mission

• Define and own SLOs, SLIs and error budgets; drive data-informed reliability decisions
• Lead incident response end-to-end: fast detection, clear communication, blameless postmortems – and reduce whole classes of incidents structurally, not case by case
• Eliminate toil through automation and GitOps; evolve our observability (metrics, logs, traces, alerting, runbooks) across two different stacks
• Help build our custom Kubernetes operator (CRDs) that makes stateful search clusters declarative, self-healing and safely upgradable – and roll out the auto-scaling (HPA/VPA, KEDA, cluster auto scaler) today's architecture makes hard
• Plan capacity, performance and cost across on-premises and cloud – including the large-catalogue and peak-season loads our merchants care about – and use AI tools wherever they measurably speed up diagnosis and operations

Your profile

Must-haves:

• Kubernetes in production – built, not just used: you've set up and maintained clusters on your own servers (e.g.kubeadm, RKE2, k3s) and know cluster lifecycle and upgrades – managed-only experienceisn'tenough for this role
• Lived SRE practice: SLOs, error budgets, incident management,on-call
• Hands-on experience withGitOpsor comparable infrastructure/deployment automation– experience with Argo CD or Flux is a strong plus
• Solid observability skills– metrics, logs, traces, alerting that people trust
• A strong automation instinct– you'd rather fix a problem's cause than repeat its workaround
• A collaborative, enabling mindset– you see SRE as a service to our developers: you ask what they need, discuss trade-offs openly, and don't fall in love with your own solution

Nice-to-haves (genuinely optional –we'llteach you the rest):

• Harvester,KubeVirt, vSphere/ESXi, OpenStack or similar virtualization/HCI platforms
• Container storage (Longhorn, Ceph) and datacenter networking (load balancing, ingress, VLAN)
• Auto-scaling (HPA, VPA, KEDA, cluster auto scaler) and capacity/cost planning
• Experience building Kubernetes operators/CRDs
• German language skills

Certifications (CKA, CKS) are welcome but no substitute for hands-on experience – in the tech interview we'll ask about what you've actually built and operated.

You don't tick every box – or your title was never “SRE”?

If you've owned production systems, handled incidents and worked deeply with Kubernetes, we want to hear from you – production experience and engineering mindset matter more to us than titles or buzzwords.

THE JOY OF WORKING WITH US

• Impact from day one: Your work directly influences the revenue of leading eCommerce brands across Europe.
• Modern tech stack: Kubernetes, Harvester, GitOps, auto-scaling, and an exciting path toward the cloud – with room to build things right.
• AI-first mindset: We use AI as a real part of our daily work, not as a buzzword.
• Ownership & growth: Clear responsibility, short decision paths, and the opportunity to actively shape your role.
• Flexible work: Hybrid work model three office days per week with a focus on outcomes.
• Strong team: Experienced engineers, an open feedback culture, and an environment where reliability is treated as a real engineering discipline.

Job Location

Berlin, Munich, Pforzheim or Stockholm (all Hybrid)