Senior Software Engineer | Kimchi (API Platform Team)

CAST AI is hiring a Senior Software Engineer for the Kimchi API Platform Team. The role involves building and scaling the inference API, datastores, billing, and observability for an AI platform that runs LLMs on Kubernetes clusters.

• Develop with observability in mind, identify bottlenecks and optimize for performance.
• Design the datastores and distributed systems behind the inference API, and keep them reliable as usage scales from a solo developer to a large enterprise.
• Build the billing, usage metering, and role-based controls that let users monitor and govern their own consumption.

• Production experience with Go or Typescript is strongly preferred; candidates without either should demonstrate strong systems programming skills in a comparable language.
• Strong debugging, optimization, and performance-tuning skills – including query profiling, index design, and database performance tuning beyond ORM usage.
• Hands-on experience with cloud platforms (AWS, GCP, or Azure) and Kubernetes is a strong plus
• Observability tooling (Prometheus, Grafana, OpenTelemetry), CI/CD and DevOps practices experience.
• Startup mindset: adaptable, proactive, and comfortable with ambiguity.
• Strong English skills, both verbal and written.
• You've personally driven a complex project end-to-end.

• 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.