Lead AI Engineer

Lead AI Engineer

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Department
Data & AI
Location
Cluj-Napoca
Hybrid

About the job

Linnify is a global technology partner that helps visionary companies accelerate their digital development initiatives. With expertise in custom software and AI development, we’ve launched over 80 digital products across Europe and North America.

We’re looking for a Lead AI Engineer to drive the architecture, development, and deployment of cutting-edge AI systems, including agentic architectures, LLM orchestration, and fine-tuned models. You will lead technical strategy and execution for AI-powered products, mentor cross-functional teams, and collaborate closely with stakeholders to bring intelligent experiences into production.

This is a hybrid role based in Cluj-Napoca, blending deep work and on-site collaboration with passionate, product-first teams.

Job responsibilities

  • Architect and lead development of AI-powered applications, especially those using agentic and LLM-based architectures
  • Own and evolve end-to-end AI workflows, including RAG pipelines, prompt orchestration, tool usage, and safety layers
  • Design and implement multi-agent systems with planning, delegation, memory, and inter-agent communication
  • Oversee fine-tuning of foundational models for downstream tasks in various domains
  • Define and monitor evaluation strategies to assess model performance, consistency, and reliability in production
  • Lead implementation of prompt safety, content moderation, and guardrails across AI components
  • Guide the integration of OCR and data extraction flows to process unstructured data
  • Provide technical leadership across AI initiatives and mentor mid-level and junior engineers
  • Collaborate with product and design teams to shape scalable, production-ready ML solutions
  • Stay up to date with AI research and tools, balancing innovation with production readiness


Job qualifications

  • 5+ years of hands-on experience in AI/ML engineering, with at least 2 years building agentic or generative AI applications
  • Proven experience leading complex AI initiatives in production, from architecture through deployment
  • Deep expertise with LangChain, LangGraph, or OpenAI Agents and agentic workflows
  • Strong understanding of foundation models, LLMs, and orchestration challenges
  • Hands-on experience designing and deploying Retrieval-Augmented Generation (RAG) systems
  • Experience with fine-tuning LLMs using supervised or reinforcement learning approaches
  • Strong understanding of vector search systems (e.g., Pinecone, Weaviate, FAISS, Qdrant)
  • Experience with evaluation pipelines and model monitoring in production environments
  • Excellent communication skills and ability to lead cross-functional technical discussions


Technical skills

  • Languages: Python (required), familiarity with JS/TypeScript is a plus
  • LLM Tooling: LangChain, LangGraph, OpenAI Agents (required)
  • Foundation Model APIs: OpenAI, Claude, HuggingFace, Cohere
  • RAG systems: Context chunking, embeddings, metadata filtering, query optimization
  • Vector databases: Pinecone, Weaviate, Qdrant, FAISS
  • Model fine-tuning: LoRA, PEFT, prompt tuning, RLHF pipelines
  • Evaluation frameworks: Prompt injection testing, regression evaluation, custom metrics
  • Prompt safety & guardrails: Moderation layers, fallback chains, output validation
  • OCR / Extraction: Experience with document parsing and unstructured data pipelines

Professional skills

  • Leadership and mentoring mindset with technical authority
  • Clear decision-making under ambiguity, balancing research with pragmatic delivery
  • Systems thinker: can connect low-level tooling with product vision
  • Strong ownership and stakeholder collaboration
  • Fluent in English


What’s in it for you?

  • Impactful work: Contribute to meaningful, real-world products
  • Hybrid flexibility: Balance in-office synergy with remote deep work
  • Modern tech stack: Build with the latest tools in a forward-thinking environment
  • Top-tier gear: Receive your own MacBook for high-performance development
  • Continuous growth: Certifications, mentoring, and learning resources provided
  • Supportive team: Work with driven, thoughtful, and innovative people


Learning & Development

We’re committed to continuous growth. At Linnify, you’ll benefit from:

  • Access to role-specific certifications/courses
  • Regular team knowledge-sharing sessions and mentoring opportunities
  • Clear visibility into your progress and opportunities for advancement


Benefits

  • Flexible work schedule and remote work days
  • ESOP (Employee Stock Ownership Plan) so that you grow with us
  • Additional loyalty vacation days (up to 28 total vacation days based on experience and time with us)
  • Health package via Regina Maria Clinic
  • Meal tickets (40 RON/day)
  • Discounted gym subscription

About Linnify

Linnify is a global technology partner that helps visionary companies accelerate their digital development initiatives. With expertise in custom software and AI development, we’ve launched over 80 digital products across Europe and North America.

Our mission is to deliver exceptional value fast through technology. We work closely with our clients to build scalable, user-centered solutions that drive meaningful impact.

How to apply

Ready to lead the future of applied AI? Apply now and be part of something meaningful.

Linnify is an equal opportunities employer. We celebrate diversity and are committed to creating an environment where everyone thrives based on ability, potential, and passion.


Join us, shape the future, and grow alongside some of the brightest minds in Cluj-Napoca.

Part of Linnify team celebrating at a BBQ party.

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