Senior Software Engineer | Kubernetes Automation | EU

📋 Job Overview

Cast AI is seeking a Software Engineer to design and build distributed systems that operate Kubernetes infrastructure autonomously at scale. The role involves writing production Go services that interact with AWS, GCP, and Azure APIs for real-time cloud resource management. This is a location-specific opportunity for candidates residing in Bulgaria, Croatia, Estonia, Greece, Hungary, Latvia, Lithuania, Poland, Romania, Slovakia, Slovenia, and Ukraine.

🏢 About Cast AI

Cast AI is a cloud optimization platform that helps organizations reduce their cloud spending while improving performance. The company focuses on Kubernetes infrastructure automation and optimization, providing solutions for node placement algorithms, provisioning, workload rightsizing, and more.

🎯 The Role

You will be responsible for designing and building distributed systems that operate Kubernetes infrastructure autonomously at scale. You will write production Go services that interact with AWS, GCP, and Azure APIs for real-time cloud resource management. This role requires a strong background in software engineering fundamentals, production experience with Go, and a deep understanding of Kubernetes internals.

✅ Key Responsibilities

• Design and build distributed systems that operate Kubernetes infrastructure autonomously at scale.
• Write production Go services that interact with AWS, GCP, and Azure APIs for real-time cloud resource management.
• Own features end-to-end: from design through implementation, testing, and production rollout.
• Debug complex production issues across cloud providers, Kubernetes clusters, and distributed services.
• Collaborate with product and other engineering teams to solve problems that don't have textbook solutions.
• Work with time-series data, cloud provider APIs, and Kubernetes control plane internals.
• Contribute to product direction and backlog - shape what gets built next, not just how it's built.
• Participate in on-call rotation for teams that require it.

📌 Required Qualifications

• Strong software engineering fundamentals: you design clean abstractions, write maintainable code, and can justify your architecture choices - not just make something work.
• Production experience with Go is strongly preferred; candidates without Go should demonstrate strong systems programming skills in a comparable language.
• Understanding of Kubernetes internals – autoscaling and networking.
• You've personally driven a complex project end-to-end.
• Experience with AI coding agents and agentic development workflows.
• You've used observability tooling in production.
• CI/CD and DevOps practices experience.
• Strong English skills, both verbal and written.
• Startup mindset: adaptable, proactive, and comfortable with ambiguity.

⭐ Desirable Experience

• Deep hands-on experience with cloud platforms (AWS, GCP, or Azure) – including real understanding of how compute, networking, and storage work under the hood.
• Deep knowledge of EKS, GKE, or AKS internals.
• Container runtime experience CRI-O, runc, containerd.
• Cloud storage depth – block storage, CSI, volume management, filesystem internals.
• Low-level Linux experience: process internals, packet-level networking (NAT, iptables, conntrack, eBPF, SDN), filesystems, storage.
• Low-level systems programming experience in C or C++.
• Kubernetes or cloud-native OSS contributions.
• Experience with AI coding agents and agentic development workflows.

🎁 Benefits

• 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.
• 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.

🛂 Visa & Eligibility

• Cast AI does not provide any form of visa sponsorship/work permit.