AI Engineer/Researcher – Applied AI Systems

Belgrade, Serbia

ApprovalMax Limited

ApprovalMax — Robust AP & AR automation that puts you in control.

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Company Description

ApprovalMax is award-winning B2B software used by businesses around the world to approve bills and expenses. It streamlines the approval process for decision makers by replacing paper and email approvals with automated workflows. ApprovalMax integrates with platforms such as Xero, QuickBooks Online and Oracle NetSuite to unlock powerful efficiencies for approvers and finance teams. The company is globally recognised and has won’ Xero App Partner of the Year’ four times since 2020 in different countries.

Job Description

Role Overview

We are seeking a highly skilled AI Engineer/Researcher to design, build, and optimize intelligent features for our business workflow and approval management platform. You will work on a range of tasks from prompt engineering and model evaluation to infrastructure and full-stack integration, collaborating closely with product and engineering teams.

Key Responsibilities

  • Research and prototype AI capabilities aligned with product goals and user workflows

  • Fine-tune or integrate pre-trained models for domain-specific use in business workflow automation

  • Connects LLMs to APIs, databases, files, and external tools.

  • Train models based on documentation, context and existing set of data

  • Build robust pipelines for prompt engineering, context retrieval, and real-time model interactions

  • Implement AI integrations across the application

  • Collaborate closely with design and engineering to deliver intuitive and intelligent features

  • Evaluate system performance and apply improvements based on real-world usage

  • Develop natural language processing capabilities

Qualifications

Skills & Experience

  • 2–4 years of experience working on AI/ML projects (academic or industry)

  • Strong foundation in natural language processing, LLMs, and embedding models

  • Proficiency with Python and ML frameworks (e.g., Hugging Face Transformers, LangChain)

  • Experience with cloud services and deployment (e.g., Docker, serverless, API integration)

  • Experience with retrieval-augmented generation (RAG) and vector search systems

  • Familiarity with prompt design, token usage optimization, and few-shot / zero-shot strategies

  • Strong experimentation mindset and attention to reproducibility and performance

  • Understanding of microservices architecture and distributed systems

Nice to Have

  • Experience with C# and .NET ecosystem

  • Background in business process automation

  • Knowledge of accounting and financial systems

  • Experience with enterprise software development

  • Understanding of security and compliance requirements in financial software

  • Experience with workflow automation systems

  • Background in human-computer interaction or plugin systems

Additional Information

We offer:

  • Regular performance-based compensation reviews
  • 100% paid 20 business vacation days
  • 100% paid 10 sick leave days
  • Remote work, flexible hours
  • Health & Wellness program - a bonus payment, which will cover 50% up to a total of 500 Euro annually of the amount spent on the following activities: medical services (except regular health insurance), fitness, sports activities (excluding sports equipment), stress management, body massage, weight management, yoga, traveling, etc.
  • Reimbursement of co-working space
  • Reimbursement of professional development courses
  • Service years recognition financial reward
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* Salary range is an estimate based on our AI, ML, Data Science Salary Index 💰

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Tags: APIs Architecture Distributed Systems Docker Engineering Finance LangChain LLMs Machine Learning Microservices NLP Oracle Pipelines Prompt engineering Python RAG Research Security Transformers

Perks/benefits: Career development Fitness / gym Flex hours Flex vacation Medical leave Salary bonus Wellness Yoga

Region: Europe
Country: Serbia

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