AI-engineer

15 hours ago

Belgrade, Central Serbia Unlimit Full time €40,000 - €80,000 per year
About Unlimit   Unlimit is the global fintech powerhouse behind the world's largest proprietary payments infrastructure. Founded in 2009, Unlimit operates across 17 global offices with 700+ experts, seamlessly integrating 1,000+ payment methods into a single platform. From London to São Paulo, we empower businesses to scale across borders with a unified suite of financial tools — including payment processing, alternative payment methods, multicurrency business accounts, card issuing, banking-as-a-service, and crypto on- and off-ramps. Our mission is to break down financial barriers and enable seamless money movement across borders. We give forward-thinking businesses the tools to accept, send, and manage payments effortlessly, wherever they operate.

We're looking for a creative and driven AI Engineer to help us design, build, and deploy intelligent automation and agent-based solutions that transform workflows across various business areas—such as Development, Testing, AML, Legal, and HR. Using cutting-edge tools like n8n, LangChain/LangGraph, vector databases (RAG), advanced prompting methods, and the latest MLOps/LLMOps practices, you'll create powerful AI agents in Slack that streamline processes, enhance compliance, and spark innovation. You'll also craft high-quality, production-grade AI code and integrations that fuel our automated agents. What You'll Be Doing:
  • At Unlimit, AI isn't a side project – it's core to how we operate and innovate. As an AI Engineer, your day-to-day won't be about just tuning models or writing scripts in isolation. You'll be building real-world systems that make decisions, automate complex workflows, and empower teams across the company.
  • You'll start by diving deep into our operations – identifying high-impact opportunities where automation can replace repetitive processes. You'll design and implement orchestrated workflows that tie together APIs, databases, and AI models, with monitoring baked in from day one so we trust what we deploy.
  • You'll also get your hands dirty developing conversational agents and intelligent bots that do more than just answer questions – they take actions, understand nuance, and support our teams across compliance, support, and product development. Some of these agents will live in Slack, others on the web, and some will integrate with tools we haven't adopted yet – you'll shape that roadmap.
  • Much of your work will touch on retrieval-augmented generation (RAG) pipelines. You'll implement vector search solutions, blending large language models with live business data so our systems always have the right context at the right time. You'll experiment with prompt engineering strategies – from chain-of-thought to few-shot – running automated evaluations to see what truly moves the needle.
  • And this isn't a solo mission. You'll collaborate closely with Legal, AML, DevOps, QA, and product teams – translating complex needs into AI-powered solutions that respect governance and deliver measurable value. You won't just be building models. You'll be helping us build trust in the decisions those models make.
Qualifications You Bring:
  • Must-Have:
  • Bachelor's or Master's degree in Computer Science, Engineering, or related field.
  • At least 3 years of hands-on experience in AI/ML engineering or automation.
  • Strong experience using LangChain/LangGraph for building LLM applications.
  • Deep knowledge of vector databases (FAISS, PGVector, Qdrant) and RAG architectures.Proficiency in Python, FastAPI, and key ML frameworks (Transformers, PyTorch, TensorFlow).Proven ability in advanced prompt engineering techniques.
  • Nice-to-Have:
  • Familiarity with n8n or similar workflow orchestration platforms.
  • Experience deploying and managing production-scale LLMs (AWS SageMaker, Azure ML, Hugging Face).
  • Practical fine-tuning skills (LoRA, full-model fine-tuning, hyperparameter optimization).
  • Experience with containerization (Docker) and orchestration systems (Kubernetes).
  • Solid understanding of MLOps and LLMOps tools and practices (MLFlow, Grafana, Prometheus).
    If you're passionate about crafting impactful AI solutions that revolutionize business processes, we'd love to meet you
Join Unlimit Team now
Unlimit is an equal opportunity employer. We believe passionately that employing a diverse workforce is central to our success. We make recruiting decisions based on your experience and skills. We welcome applications from all members of society irrespective of age, sex, disability, sexual orientation, race, religion or belief. We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.

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