Senior Software Engineer - Kubernetes and Infrastructure

Why Cast AI?

Cast AI is the leading Application Performance Automation (APA) platform, enabling customers to cut cloud costs, improve performance, and boost productivity – automatically.

Built originally for Kubernetes, Cast AI goes beyond cost and observability by delivering real-time, autonomous optimization across any cloud environment. The platform continuously analyzes workloads, rightsizes resources, and rebalances clusters without manual intervention, ensuring applications run faster, more reliably, and more efficiently.

Headquartered in Miami, Florida, Cast AI has employees in more than 32 countries worldwide and supports some of the world’s most innovative teams running their applications on all major cloud, hybrid, and on-premises environments. Over 2,100 companies already rely on Cast - from BMW and Akamai to Hugging Face and NielsenIQ.

What’s next? Backed by our $108M Series C, we’re doubling down on making APA the new standard for DevOps and MLOps, and everything in betwe

Core values that hold us all together:

PRACTICE CUSTOMER OBSESSION. Focus on the customer journey and work backwards. Strive to deliver customer value and continuously solve customer problems. Listen to customer feedback, act, and iterate to improve customer experience.

LEAD. Take ownership and lead through action. Think and act on behalf of the entire company to build long-term value across team boundaries.

DEVELOP AND HIRE THE BEST. Strive to raise the performance bar by continuously investing in yourself, the team and by hiring the best possible candidates for every position. Drive towards personal development and professional growth, and mentor others to raise the collective bar.

EXPECT AND ADVOCATE CHANGE. Strive to innovate and accept the inevitable change that comes with innovation. Constantly welcome new ideas and opinions. Share insights responsibly with unwavering openness, honesty, and respect. Once a path is chosen, be ready to disagree and commit to a direction.

The opportunity:

We’re looking for an experienced Senior Software Engineer to help build the foundation services that power our multi‑cloud cost‑optimisation and automation platform. You’ll work on the low‑level guts of Kubernetes - controllers, operators, networking, scheduling, Cloud providers low-level services for infrastructure resources - as well as the APIs and tooling that make those capabilities effortless for thousands of engineers around the world.

Think of it as building the connective tissue that lets any workload run in the right place, on the right resources, at the right price-no matter which cloud or how many clusters are involved.

What You'll Do:

• Design, build, and operate backend services and Kubernetes operators in Go that manage clusters across AWS, GCP, and Azure.


• Develop cluster networking, scheduling, and orchestration features that unlock seamless workload portability and resource efficiency.


• Extend and maintain our Terraform provider and other IaC components that integrate CAST AI with customer environments.


• Contribute to high‑volume data‑plane services (gRPC/REST) and asynchronous workflows.


• Shape public and internal APIs with an eye for simplicity and developer experience.


• Participate in design reviews, code reviews, on‑call rotations, and occasional customer deep‑dives.

The Tech You’ll Touch:

• Go, Kubernetes controller‑runtime / operator‑SDK, Virtual Kubelet, WireGuard


• Public clouds: AWS EKS, GCP GKE, Azure AKS (plus self‑managed clusters)


• Data & messaging: PostgreSQL, GCP Pub/Sub


• Workflow & orchestration: Temporal


• IaC / GitOps: Terraform, Helm, GitLab CI, Github CI, Argo CD


• Observability: Prometheus, Grafana, Loki, Tempo

(Not every candidate knows every tool—our stack evolves, and we care more about your ability to learn.)

What We’re Looking For:

• Based in GMT 0 – GMT +3 and comfortable working fully remote.


• Solid backend engineering fundamentals and production‑grade coding skills (preferably in Go).


• Hands‑on experience with Kubernetes internals, cloud infrastructure, or large‑scale distributed systems.


• Clear, concise communication in English and a collaborative, self‑directed work style.


• A "yes‑we‑can" mindset—bias toward action, ownership, and delivering customer value.

Nice‑to‑Haves:

• Contributions to the Kubernetes or cloud native OSS ecosystem.


• Deep knowledge of cloud networking, storage, or virtualisation.


• In-depth understanding of how EKS, GKE or AKS architecture and operations.

Why You’ll Love It Here?

• Join a fast‑growing, customer‑obsessed team redefining cloud‑native automation.


• Work with top talent in a flexible, remote‑first culture and travel for occasional team events or conferences.


• Iterate fast—feature projects typically ship in 1‑4 weeks with an ultra‑short feedback loop.


• 10 % innovation time to invest in learning or side projects.


• Competitive compensation, equity options, and €6 500 – €9 000 / month gross depending on experience.


• Hardware budget, professional‑development stipend, and the tooling you need to do your best work.

Ready to build the future of multi‑cloud Kubernetes? Apply now and let’s talk!