AI Integrator

Job Description
Our customer is one of the world’s top 10 software publishers, trusted by more than 10 million customers worldwide. The company develops innovative Creativity & Learning software, Utilities, and Multimedia solutions, leveraging cutting-edge technologies to deliver seamless, secure, and user-friendly experiences for both consumers and businesses. With over 650,000 software products sold every year - and one purchase made every few seconds - they continue to shape the future of digital software.
We’re looking for an AI Integration Engineer to join this mission and take ownership of the model-serving API, AI-powered web application features, and the orchestration backbone of a next-generation document processing platform. This is a high-impact, full-stack role for engineers who want to build real AI systems - not just integrate third-party APIs.

Job Benefits

• Competitive salary
• Sick, personal leave
• Flexible working hours
• Flexible working location (Remote/Office/Mixed)
• Technical equipment
• Professional development and regular Performance Appraisals
• Health Insurance
• Online courses
• Corporate events, tech talks, and so on

Requirements

• 3+ years of experience across backend, API design, and web technologies;
• Proven track record deploying or integrating LLMs in production (open-source models strongly preferred);
• Hands-on knowledge of REST API design and at least one API framework;
• Experience building AI features in web apps, including streaming and async response handling;
• Familiarity with document processing workflows — OCR, parsing, classification at scale;
• Comfortable designing multi-step orchestration pipelines with task queues, retries, and failure handling;
• Strong communication skills; able to reason about trade-offs across latency, cost, and accuracy with stakeholders.

Responsibilities
Model Serving & API

• Evaluate and deploy open-source LLMs via vLLM, Ollama, or TGI on GPU infrastructure;
• Design and maintain a REST API with auth, rate limiting, versioning, and API documentation;
• Optimize inference: quantization, batching, and concurrency tuning for latency/cost trade-offs.

Web App Integration

• Integrate AI features into our web apps and document processing platforms;
• Build AI-powered UI components: chat interfaces, inline suggestions, smart search, and summarization widgets;
• Collaborate with frontend engineers on UX patterns specific to async and streaming AI responses.

Document Orchestration

• Design multi-step orchestration pipelines for document ingestion, parsing, classification, and extraction;
• Integrate OCR, layout detection, and chunking strategies for PDFs, Word docs, spreadsheets, and scanned images;
• Build RAG pipelines with hybrid retrieval (dense + sparse) over document corpora;
• Implement task queues and async workers to handle high-volume document processing reliably.

Platform & Collaboration

• Write technical docs, so the platform is maintainable by the whole team and accessible for technology partners;
• Stay current on the open-source model ecosystem and advise on model selection and upgrades.

Who we are
Proffiz is a web and mobile software engineering company of dedicated professionals based in Ukraine and Poland. Throughout years of passionate work, we create software solutions for Fintech, Print, Photo&Image, and other industries. At Proffiz, we strive to deliver top-quality of our work and are looking for exceptional talent to join us. If you are excited about the opportunity to collaborate and grow among passionate experts — we invite you to our team!
Ready, Steady, Go!)