Applied LLM Engineer

Job not on LinkedIn

🔥 0 minutes ago

🇵🇱 Poland – Remote

⏰ Full Time

🟢 Junior

🟡 Mid-level

🗣️ LLM Engineer

🚫👨‍🎓 No degree required

👻 Ghost score 12%

What it means: how likely this posting is sitting open without active hiring.How to read it: 60% or higher means we think this is a ghost. Lower scores are less of a worry.How we score it: age, reposts, open roles vs team size, how fast jobs close, and whether pay is listed.Fine print: an estimate from public data, not a judgment of the company. Real jobs can score high, so treat it as a hint, not a fact.

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Yo Mobile Games & Computer Services

WebsiteLinkedInAll Job Openings

1 - 10 employees

🎮 Gaming

Gaming • Software

Yo Mobile Games & Computer Services is a company that specializes in both mobile game development and computer services. They offer mobile game and business development services for iOS and Android devices, featuring various apps like So Tricky, So Tricky Flappy Head, T-Shirt Toss, and Hippity Hop, available on the Apple App Store and Google Play Store. Additionally, the company provides PC maintenance, spyware, malware, and virus removal services for small to large businesses. Yo Mobile also offers surveillance system services, emphasizing their comprehensive approach to addressing both gaming and computer service needs.

📋 Description

• Own YOlanda’s system prompt, including persona, tone, safety rules, refusals, and handoff behavior • Write and maintain prompts for V3 user actions, including plan changes, top-ups, balance queries, offers, troubleshooting, and account support • Design conversations to reach a product or service within five responses • Define YOlanda’s boundary of knowledge and create seamless handoffs to YOnC • Manage context about users, accounts, and plan catalogues; break tasks into chains and tool calls • Build and maintain bilingual evaluation sets with test cases, pass conditions, and trackable scores • Measure the YOlanda/YOnC boundary, fact-check plan and account information, and red-team top-up and rewards flows • Trace calls and monitor prompt versions, models, tokens, cache hits, latency, and cost • Set latency and availability SLOs and build alerts • Own gateway timeouts, retries, and provider/model fallbacks • Design cacheable prompts and build semantic, retrieval, and tool-result caching with correct scoping and invalidation • Optimize token budgets, context trimming, output length, and batch APIs • Benchmark and route frontier and open models by task based on accuracy, latency, and cost • Collaborate with engineers running open models on YOnC compute • Keep prompts, models, and configuration versioned, reviewed, tested, owned, and rollback-ready in git • Build CI release gates, canary deployments, staged rollouts, and kill switches • Audit account- and money-related actions and redact personal data before logging or sending to third-party providers • Implement runtime guardrails including prompt-injection defenses, tool permissions, spend limits, and human-approval points • Set cost budgets per feature and model with alerts and translate AI/money/operator-account rules into code controls • Open pull requests against the LangChain and LangGraph build alongside the two owning engineers • Work daily in models and production without managing people

🎯 Requirements

• Two or more years building with large language models in production, at real traffic • Python proficiency, including scripts, API clients, data handling, and tests • Git, JSON, regex, and Markdown • Shipped production systems with LangChain and LangGraph; able to read and modify an unfamiliar graph safely • Experience writing and shipping system prompts and building evaluation harnesses • Ability to change one variable at a time and record results • Production experience with tracing, SLOs, fallbacks, and correctly invalidated caching • Demonstrated before-and-after improvements in cost and latency with quantified results • Practical governance experience with versioning, release gates, audit logging, and personal data handling • Production retrieval experience with chunking, embeddings, reranking, and grounding answers in sources; knowing when retrieval is inappropriate • Exceptional written English, including syntax, register, and nuance • Care for users, particularly prepaid-plan users who count every dollar

🏖️ Benefits

• Flexible working hours • Competitive salary • Real opportunity for personal and professional growth