09/15/2026 updated
100 % available
Senior Python Full-Stack & AI Engineer | AI Agents | LLM | Next.js | React
Warszawa, Poland
Only remote
Cracow University of Technology - Bachelor of Computer ScienceAbout me
I’m a Full Stack AI Engineer passionate about building autonomous agents. With 10+ years of experience, Over the past few years, I’ve worked creating everything from research & data-gathering bots to trading systems, customer support agents, and IVR voice assistants.
Tailwind CSSLangChainJavaScriptPHPApplication Programming Interfaces (APIs)Artificial IntelligenceDevOpsDjangoPython (Programming Language)Machine LearningNode.jsNext.jsTypeScriptPyTorchReact.js
AI & Machine Learning
Expertise in building autonomous AI agents, multi-agent systems with memory and planning, LLM integration (OpenAI, Anthropic, open-source models), RAG pipelines, transformer-based model fine-tuning, LangChain, AutoGen, CrewAI, and Voice AI development.
Python Backend Development
Strong command of Python-based backend frameworks including Django, FastAPI, and Flask, with experience designing RESTful APIs, GraphQL endpoints, and scalable server-side architectures for production environments.
Full-Stack Web Development
Proficiency in building end-to-end web applications using React, Next.js, Vue.js, TypeScript, and JavaScript on the frontend, combined with robust backend services and database integrations.
Frontend Technologies
Hands-on experience with React, Vue.js, Next.js, TypeScript, JavaScript, and Tailwind CSS for building responsive and performant user interfaces.
Databases & Storage
Working knowledge of PostgreSQL, MySQL, MongoDB, Redis, Firebase, Supabase, DynamoDB, and Pinecone for vector storage and semantic search.
Cloud Infrastructure & DevOps
Experience containerizing applications with Docker and deploying to AWS EC2 and RDS, setting up staging and production environments that significantly reduced deployment-related incidents.
NLP & Sentiment Analysis
Building and fine-tuning transformer-based models for sentiment classification using PyTorch and the Hugging Face ecosystem, including automated model drift detection and retraining pipelines.
API Design & Integration
Design and implementation of RESTful APIs and GraphQL services, including JWT-based authentication, role-based access controls, and third-party API integrations such as OpenAI and ChatGPT APIs.
Node.js & PHP Development
Experience with Node.js, Express.js, and PHP for backend development, including modernizing legacy monolithic PHP applications into modern Django and React stacks.
Expertise in building autonomous AI agents, multi-agent systems with memory and planning, LLM integration (OpenAI, Anthropic, open-source models), RAG pipelines, transformer-based model fine-tuning, LangChain, AutoGen, CrewAI, and Voice AI development.
Python Backend Development
Strong command of Python-based backend frameworks including Django, FastAPI, and Flask, with experience designing RESTful APIs, GraphQL endpoints, and scalable server-side architectures for production environments.
Full-Stack Web Development
Proficiency in building end-to-end web applications using React, Next.js, Vue.js, TypeScript, and JavaScript on the frontend, combined with robust backend services and database integrations.
Frontend Technologies
Hands-on experience with React, Vue.js, Next.js, TypeScript, JavaScript, and Tailwind CSS for building responsive and performant user interfaces.
Databases & Storage
Working knowledge of PostgreSQL, MySQL, MongoDB, Redis, Firebase, Supabase, DynamoDB, and Pinecone for vector storage and semantic search.
Cloud Infrastructure & DevOps
Experience containerizing applications with Docker and deploying to AWS EC2 and RDS, setting up staging and production environments that significantly reduced deployment-related incidents.
NLP & Sentiment Analysis
Building and fine-tuning transformer-based models for sentiment classification using PyTorch and the Hugging Face ecosystem, including automated model drift detection and retraining pipelines.
API Design & Integration
Design and implementation of RESTful APIs and GraphQL services, including JWT-based authentication, role-based access controls, and third-party API integrations such as OpenAI and ChatGPT APIs.
Node.js & PHP Development
Experience with Node.js, Express.js, and PHP for backend development, including modernizing legacy monolithic PHP applications into modern Django and React stacks.
Experience
Professional experience10+ years
Freelancer since2016
Languages
EnglishFluentPolishNative speaker
Project history
Technical lead for a greenfield AI-powered knowledge management platform for mid-sized manufacturing companies. Architected the system using Next.js, FastAPI, PostgreSQL, and Pinecone for vector storage. Integrated multiple LLM providers (OpenAI, Anthropic, open-source) via an abstraction layer. Implemented a feedback loop for fine-tuning embeddings and improving relevance metrics.
Productized internal NLP research into a sellable API for financial services clients. Built and fine-tuned transformer-based models for sentiment classification on earnings call transcripts using PyTorch and Hugging Face. Developed a RAG pipeline pulling SEC filings and news articles into context windows. Designed an evaluation framework with automated retraining triggers for model drift.
Modernized a monolithic PHP application into a Django and React stack, leading data migration for over two million customer records. Designed RESTful APIs with JWT-based authentication and role-based access controls. Containerized the application with Docker and set up staging and production environments on AWS EC2 and RDS, reducing deployment incidents by about 70%.
Certificates
Web Development with Python Certification
Google2025
AI Engineer Professional Specialization
Coursera2022