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 between.

About The Role

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.

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.)

Requirements

• 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.

Responsibilities:

• 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.

What’s in it for you?

• Competitive salary (€6,500 - €9,000 gross, depending on the level of experience)
• Enjoy a flexible, remote-first global environment.
• Collaborate with a global team of cloud experts and innovators, passionate about pushing the boundaries of Kubernetes technology.
• Enjoy a flexible, remote-first global environment.
• Equity options.
• Private health insurance.
• Get quick feedback with a fast-paced workflow. Most feature projects are completed in 1 to 4 weeks.
• Spend 10% of your work time on personal projects or self-improvement.
• Learning budget for professional and personal development - including access to international conferences and courses that elevate your skills.
• Annual hackathon to spark new ideas and strengthen team bonds.
• Team-building budget and company events to connect with your colleagues.
• Equipment budget to ensure you have everything you need.
• Extra days off to help maintain a healthy work-life balance.