Senior AI Engineer - Harness Engineering
New
C
Cast AIAI Platform
Bulgaria, Croatia, Estonia, Greece, Hungary, Latvia, Lithuania, Poland, Romania, Slovakia, Slovenia, and UkraineFull-TimeSenior
Salary6,500 - 9,000 EUR per month
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Job Details
- Required Skills
- AWSGCPKubernetesTypeScriptAzureGoGrafanaPrometheus
Requirements
- Used AI coding agents in anger (real work, not demos).
- Strong TypeScript or Go in production.
- Comfort moving between TypeScript and Go.
- Think in harness terms (failure as context missing, hook, or constraint problem).
- Drive features end-to-end (design → build → ship → measure → iterate).
Responsibilities
- Build and evolve the agent harness - ship hooks, permission gates, and context compaction.
- Own long-horizon execution - multi-session task completion via spec-driven prompting, worktree-per-slice git, Ralph loop recovery, and stuck detection.
- 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 - CLI, TUI, MCP integrations, sandboxed execution, telemetry.
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