{"id":1726894,"url":"https://alion.io/job/cast-ai-senior-software-engineer-kimchi-harness-team","title":"Senior Software Engineer | Kimchi (Harness Team)","company":{"id":54,"name":"CAST AI","domain":"cast.ai","url":"https://alion.io/company/cast-ai","size_band":"201-500","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"B","score":82,"open_postings":7,"ghost_share":0,"stale_share":0.714,"repost_share":0,"time_to_fill_p50_days":49,"computed_at":"2026-10-29T05:49:05Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":null,"work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"board_field","remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Bulgaria","Croatia","Hungary","Estonia","Greece","Latvia","Lithuania","Cyprus","Finland","Ireland","Malta"],"countries":["BG","HR","HU","EE","GR","LV","LT","CY","FI","IE","MT"],"hiring_countries":["BG"],"hiring_countries_total":1,"salary":null,"salary_estimate":{"min_usd":47000,"max_usd":90000,"period":"year","method":"role_seniority_country_cell","sample_n":8},"experience_years_min":null,"visa_sponsorship":true,"relocation_package":false,"has_equity":true,"technologies":[{"name":"Anthropic","optional":false},{"name":"AWS","optional":false},{"name":"Azure","optional":false},{"name":"CI/CD","optional":false},{"name":"DeepSeek","optional":false},{"name":"GCP","optional":false},{"name":"Grafana","optional":false},{"name":"Kubernetes","optional":false},{"name":"MiniMax","optional":false},{"name":"Model Context Protocol","optional":false},{"name":"OpenAI","optional":false},{"name":"OpenTelemetry","optional":false},{"name":"Prometheus","optional":false},{"name":"TypeScript","optional":false}],"status":"live","first_seen_at":"2026-10-02T14:40:02Z","employer_posted_date":"2026-10-09","last_verified_at":"2026-10-29T04:38:43Z","board_verified":true,"closed_at":null,"days_open":26,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":26},"description":"Why Kimchi?\nKimchi is the AI platform inside CAST AI. We started by helping companies run LLMs on their own Kubernetes clusters and now we're providing a managed variant of those same capabilities.\nOur Infrastructure today\nMulti-model inference (MiniMax, Kimi, GLM-5, Nemotron, DeepSeek) with intelligent routing, an OpenAI-compatible API and deployment ranging from our GPUs to your own VPC. The inference layer is the foundation and the API is what sits in front of it as the primary channel for broadly and reliably distributing our AI services and powers our own Kimchi harness.\nAs a Senior Software Engineer, you will have the opportunity to work on different key features of our product. All of these are high-agency roles across multiple parts of the tech stack that minimize process friction that would otherwise prevent you from shipping.\nIn every team you will own features end-to-end: design, implementation, testing, production rollout. Most projects ship in 1-4 weeks. You'll work directly with product and other engineering teams on problems that don't have textbook solutions.\nWe are currently hiring Senior Software Engineers for the Harness team:\nOpenAI and Anthropic ship models. They also ship one harness each - the scaffolding that turns a raw model into something that can plan, execute, recover, and complete work. We ship a different kind of harness: one built for cost-conscious, long-horizon autonomy, running on inference infrastructure we control end-to-end.\nA decent model with a great harness beats a great model with a bad harness. We've watched this play out. The gap between what today's models can do and what you see them doing is largely a harness gap - and that gap is where we operate.\nResponsibilities:\nArchitect planner/executor/evaluator pipelines - planning with a reasoning model, execution with a fast one, evaluation with a third. No self-verification.\nManage agent memory and context - state persistence across sessions, context compaction, tool-call offloading\nOwn the harness surface - TUI, MCP integrations, telemetry.\nWork directly with users - including our own colleagues - to identify, understand and fix pain points\nRequirements\nProduction experience with Go or Typescript is strongly preferred; candidates without either should demonstrate strong systems programming skills in a comparable language.\nStrong debugging, optimization, and performance-tuning skills - including query profiling, index design, and database performance tuning beyond ORM usage.\nHands-on experience with cloud platforms (AWS, GCP, or Azure) and Kubernetes is a strong plus\nObservability tooling (Prometheus, Grafana, OpenTelemetry), CI/CD and DevOps practices experience.\nStartup mindset: adaptable, proactive, and comfortable with ambiguity.\nStrong English skills, both verbal and written.\nYou've personally driven a complex project end-to-end.\n(Harness) Experience on working with harnesses and creating your own AI workflows is a strong plus\nWhat’s in it for you?\nCompetitive salary (€6,500 - €9,000 gross, depending on the level of experience).\nEnjoy a flexible, remote-first global environment.\nCollaborate with a global team of cloud experts and innovators, passionate about pushing the boundaries of Kubernetes technology\nEquity options.\nGet quick feedback with a fast-paced workflow. Most feature projects are completed in 1 to 4 weeks.\nSpend 10% of your work time on personal projects or self-improvement. \nLearning budget for professional and personal development - including access to international conferences and courses that elevate your skills.\nAnnual hackathon to spark new ideas and strengthen team bonds.\nTeam-building budget and company events to connect with your colleagues.\nEquipment budget to ensure you have everything you need.\nExtra days off to help maintain a healthy work-life balance.\nHiring process\nScreening call with Recruiter\nHiring Manager interview\nTechnical interview (system design)\nLive coding\nCulture Check interview with an executive\nAs part of our standard hiring process, we would like to inform you that a background check may be conducted at the final stage of recruitment through our third-party provider, Checkr.\nPlease note that Cast AI does not provide any form of visa sponsorship/work permit.","description_format":"text","description_chars":4273,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[{"language":"English","level":"All levels","optional":false}]},"benefits":["Company events","Equity"],"hiring_locations":[{"name":"Bulgaria","iso":"BG","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Virtualization & Containers","Cloud Cost & Multi-Cloud Management"],"lifecycle":[{"event":"open","at":"2026-10-02T22:24:20Z"}],"visa":[],"liveness":{"score":79,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.88,"p_room":0.9,"age_days":26,"expected_fill_days":49,"reasons":["conf:1","velocity","win:mid"],"computed_at":"2026-10-29T05:49:05Z"},"pay":null,"html_url":"https://alion.io/job/cast-ai-senior-software-engineer-kimchi-harness-team","json_url":"https://alion.io/job/cast-ai-senior-software-engineer-kimchi-harness-team.json","meta":{"generated_at":"2026-10-29T05:55:30Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":9098,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-30T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":54},"rest":"https://alion.io/mcp/rest/get_company?id=54"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fcast-ai-senior-software-engineer-kimchi-harness-team"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fcast-ai-senior-software-engineer-kimchi-harness-team"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fcast-ai-senior-software-engineer-kimchi-harness-team"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/cast-ai-senior-software-engineer-kimchi-harness-team\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fcast-ai-senior-software-engineer-kimchi-harness-team"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":1726894}},{"tool":"search_jobs","arguments":{"company":"cast.ai","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":1726894},"note":"people open to offers who fit this vacancy"}],"note":"The same data through MCP tools: https://alion.io/mcp/open needs no sign-in (compact searches, postings, people); https://alion.io/mcp with an Alion account has everything. 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