Senior Software Engineer | Kimchi (Harness Team)

Kimchi is the AI platform inside CAST AI, providing managed LLM inference on Kubernetes. The Senior Software Engineer will work on the Harness team, building agent pipelines, managing agent memory, and owning the harness surface including TUI, MCP integrations, and telemetry.

• Own features end-to-end: design, implementation, testing, production rollout.
• Architect planner/executor/evaluator pipelines – planning with a reasoning model, execution with a fast one, evaluation with a third.
• Manage agent memory and context – state persistence across sessions, context compaction, tool-call offloading.
• Own the harness surface - TUI, MCP integrations, telemetry.
• Work directly with users - including our own colleagues - to identify, understand and fix pain points.

• 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.
• (Harness) Experience on working with harnesses and creating your own AI workflows is a strong plus

• 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.