Senior Software Engineer - OMNI

Location: Bulgaria; Hungary; Lithuania; Poland; Romania; Slovenia; Ukraine

Department: Technology

Why Cast AI?

Cast AI is an automation platform that operates cloud-native and AI infrastructure at scale. By embedding autonomous decision-making directly into Kubernetes and cloud environments, Cast AI continuously optimizes performance, reliability, and efficiency in production.

The old way doesn't work. As Kubernetes and AI environments grow, manual decisions don’t. Cast AI replaces tickets, alerts, and manual tuning with continuous automation that adapts infrastructure as conditions change. Efficiency and cost savings follow naturally from that automation.

Over 2,100 companies already rely on Cast AI, including Akamai, BMW, Cisco, FICO, HuggingFace, NielsenIQ, Swisscom, and TGS.

Global team, diverse perspectives
We're headquartered in Miami, but our impact is international. We take a global and intentional approach to diversity. Today, Cast AI operates across 34 countries spanning Europe, North America, Latin America, and APAC, bringing a wide range of perspectives into how we build and lead. 

Unicorn momentum
In January 2026, we achieved unicorn status with a strategic investment from Pacific Alliance Ventures, the corporate venture arm of Shinsegae Group (a $50+ billion Korean conglomerate). Our valuation now exceeds $1 billion, and we're just getting started.

Join us as we build the future of autonomous infrastructure.

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.

• Go, Kubernetes, controller‑runtime, Virtual Kubelet
• Public clouds: *AWS EKS*, *GCP GKE*, *Azure AKS*
• Data & messaging: *PostgreSQL, GCP Pub/Sub*
• Workflow & orchestration: *Temporal*
• IaC / GitOps: *Terraform, Helm, GitLab CI, Github CI, Argo CD*
• Observability: *Prometheus, Grafana, Loki, Tempo*

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.
• 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.
  
  #LI-Remote