Senior Software Engineer | AI Agents & Cloud Platform (Cast Pilot team)

Location: Bulgaria; Croatia; Hungary; Moldova; North Macedonia; Romania; Slovenia

Department: Technology

What you'll be solving

A platform engineer opens their AI client of choice, connects it to CAST AI, and types: "Why did our spend jump 40% in eu-west last week?" Thirty seconds later they have an answer, pulled from live cluster state and cost data, with links back to the evidence. No dashboards. No YAML archaeology. Just a question and a correct, permission-checked answer.

Your job is to make that interaction boring. Reliably, securely, at production scale.

Behind it sits the hard part: an AI assistant that reasons over thousands of production Kubernetes clusters, a platform that safely exposes company infrastructure to external AI clients, and quality pipelines that tell us when the agent is wrong before a customer does. Get it right, and operators stop clicking through consoles entirely. Get it wrong once, and an agent gives a confidently wrong answer to someone managing production.

CAST AI already runs Kubernetes infrastructure autonomously. Our automation makes thousands of cost-and-reliability decisions a day. Cast Pilot is the team building the intelligence layer on top of that: AI assistants for Kubernetes and the cloud itself. Our assistant already answers thousands of questions a month from hundreds of organizations. Now we're opening the platform up: a public, permission-aware MCP server so customers can plug CAST AI straight into their own AI clients and agents, deeper connectivity across all three major clouds (AWS, GCP, Azure), and a continuous push to make our agents smarter, better grounded, and more capable.

This is greenfield AI platform work on top of battle-tested infrastructure. Most features ship in 1 to 4 weeks.

This is a location-specific opportunity. We are currently accepting applications from candidates residing in the following European countries: Bulgaria, Croatia, Estonia, Greece, Hungary, Latvia, Lithuania, Poland, Romania, Slovakia, Cyprus, Malta, Finland, Sweden, Ireland, Moldova, North Macedonia, Montenegro, Slovenia, and Ukraine.

Requirements

• Strong software engineering fundamentals: you design clean abstractions, write maintainable code, and can justify your architecture choices, not just make something work. You're a generalist who is as comfortable debugging a distributed system as designing an auth flow or tuning an agent's behavior.

• Production experience with Go is strongly preferred; candidates without Go should demonstrate strong systems programming skills in a comparable language.

• Experience building or operating large-scale SaaS platforms in production: multi-tenant systems, high volumes, and the failure modes that only show up at scale.

• Solid understanding of Kubernetes. Our entire platform runs on it, and the assistants we build answer questions about it. You should be at home with autoscaling, scheduling, and networking concepts.

• You've personally driven a complex project end-to-end.

• Hands-on experience with AI coding agents and agentic development workflows. This is how we build, not just what we build.

• 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.

What will make you stand out

• You've built agentic systems that shipped: MCP servers or clients, agent gateways, tool-use orchestration, RAG pipelines, evaluation frameworks, and you can talk about what broke in production and how you found out. This is the single biggest differentiator for our team.

• Deep hands-on experience with one or more of AWS, GCP, or Azure, with real understanding of IAM, compute, networking, and their APIs, not just console-level usage.

• Experience with LLM application quality: evaluations, prompt engineering at scale, latency and cost optimization of agent loops.

• Knowledge of OAuth 2.0 / OIDC and multi-tenant authorization design.

• Deep knowledge of EKS, GKE, or AKS internals.

• Kubernetes or cloud-native OSS contributions.

Responsibilities

• Design and build the systems behind our AI assistant: agent flows, context retrieval, and the data connections that let it reason about live Kubernetes infrastructure.

• Build and evolve our public, permission-aware MCP server: curated tools, identity, audit, and strict safety gates, so customers can use CAST AI from their own AI clients.

• Develop and maintain cloud connectivity across AWS, GCP, and Azure, and the data foundations our agents build on.

• Write production Go services that interact with cloud provider APIs, the Kubernetes control plane, and LLM APIs in real time.

• Own features end-to-end: from design through implementation, testing, and production rollout (most projects ship in 1 to 4 weeks).

• Debug novel problems: an agent giving a wrong answer, a cross-cloud permission edge case, a data freshness issue that only appears at scale.

• Build the quality harness: evals, telemetry, feedback loops, that let us ship agent improvements without regressions.

• Contribute to product direction and backlog. Shape what gets built next, not just how it's built.

• Participate in the team's on-call rotation.

Tools We Use Daily

• Programming Languages: Go

• AI & Agents: MCP (servers and clients), agent gateways, LLM provider APIs, RAG, evaluation pipelines

• Cloud & Orchestration: Kubernetes, AWS, GCP, Azure

• Infrastructure as Code: Terraform

• Databases & Storage: PostgreSQL, Cloud Object Storage, ClickHouse

• Workflows & APIs: Temporal, GCP Pub/Sub, gRPC, REST

• Observability & Product Analytics: Prometheus, Grafana, Loki, Tempo, PostHog

• CI/CD & GitOps: GitLab/GitHub CI with ArgoCD and Kargo

What's in it for you?

• Competitive salary (€6,500 to €9,000 gross, depending on the level of experience)

• Work on genuinely new problems: production MCP platforms and AI assistants for Kubernetes and cloud infrastructure are not solved domains. You'll be defining them, not following a playbook.

• Equity options.

• Real users, fast: your work ships to hundreds of organizations in weeks, not quarters.

• 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.

• 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.

• 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.

Hiring process

1. Screening call with Recruiter

2. Hiring Manager interview

3. Technical interview (system design)

4. Live coding

5. Culture Check interview with an executive

As part of our standard hiring process, a background check may be conducted at the final stage of recruitment through our third-party provider, Checkr. Please note that Cast AI does not provide any form of visa sponsorship/work permit.

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