10/07/2026 updated
100 % available
Senior Full Stack Engineer
Poznan, Poland
Only remote
Bachelor's Degree in Computer ScienceAbout me
Senior Full-Stack Engineer with 9+ years of experience building scalable web, mobile, and AI applications. Skilled in React, Next.js, Node.js, Python, React Native, Flutter, Firebase, Supabase, AWS, Azure, OpenAI, and CI/CD. Passionate about delivering high-quality solutions.
SupabaseFlutterPHPApple Push Notification ServiceApp Store (IOS)Apache CloudStackDevOpsOpenStackScrum MethodologyIonicWebSocketWorkflowsCloud Platform SystemReact.jsGoogle Firebase
Full Stack Web Development
Over 9 years of experience in developing and maintaining high-performance web applications using modern JavaScript frameworks such as React, Vue.js, Angular, and Next.js, combined with backend technologies including Node.js, PHP, and Python.
Mobile App Development
More than 6 years of experience in developing cross-platform mobile applications using React Native, Ionic, Flutter, and Expo, with integration of Firebase and Supabase for real-time features.
AI & Machine Learning Integration
Expertise in building robust AI applications using Langchain, LLM, and AI services such as AWS Bedrock, Azure AI, and OpenAI, including the development of intelligent chatbot features and RAG-based workflows.
RESTful API & GraphQL Development
Extensive experience in designing and integrating RESTful APIs and GraphQL endpoints, ensuring seamless data flow and dynamic user experiences across various platforms.
CI/CD Pipelines & DevOps
Extensive knowledge in building and maintaining CI/CD pipelines using Jenkins, Docker, Kubernetes, GitHub Actions, and Fly.io, automating deployment processes and improving development velocity.
Cloud Platform Deployment
Proven experience in deploying and managing applications on cloud platforms including AWS, Azure, and GCP, ensuring high scalability, security, and maintainability.
Database Management
Proficiency in working with a wide range of databases including SQL, MySQL, PostgreSQL, SQLite, MongoDB, Firebase, Supabase, AWS DynamoDB, and AWS RDS.
CSS Frameworks & UI Libraries
Strong experience with advanced CSS frameworks and libraries such as Tailwind CSS, Material UI, and Bootstrap to ensure responsive and visually appealing user interfaces.
Agile Methodologies & Version Control
Solid command of Agile, Scrum, and Kanban practices combined with version control using Git, GitHub, and GitLab, supporting efficient team collaboration and project management.
Over 9 years of experience in developing and maintaining high-performance web applications using modern JavaScript frameworks such as React, Vue.js, Angular, and Next.js, combined with backend technologies including Node.js, PHP, and Python.
Mobile App Development
More than 6 years of experience in developing cross-platform mobile applications using React Native, Ionic, Flutter, and Expo, with integration of Firebase and Supabase for real-time features.
AI & Machine Learning Integration
Expertise in building robust AI applications using Langchain, LLM, and AI services such as AWS Bedrock, Azure AI, and OpenAI, including the development of intelligent chatbot features and RAG-based workflows.
RESTful API & GraphQL Development
Extensive experience in designing and integrating RESTful APIs and GraphQL endpoints, ensuring seamless data flow and dynamic user experiences across various platforms.
CI/CD Pipelines & DevOps
Extensive knowledge in building and maintaining CI/CD pipelines using Jenkins, Docker, Kubernetes, GitHub Actions, and Fly.io, automating deployment processes and improving development velocity.
Cloud Platform Deployment
Proven experience in deploying and managing applications on cloud platforms including AWS, Azure, and GCP, ensuring high scalability, security, and maintainability.
Database Management
Proficiency in working with a wide range of databases including SQL, MySQL, PostgreSQL, SQLite, MongoDB, Firebase, Supabase, AWS DynamoDB, and AWS RDS.
CSS Frameworks & UI Libraries
Strong experience with advanced CSS frameworks and libraries such as Tailwind CSS, Material UI, and Bootstrap to ensure responsive and visually appealing user interfaces.
Agile Methodologies & Version Control
Solid command of Agile, Scrum, and Kanban practices combined with version control using Git, GitHub, and GitLab, supporting efficient team collaboration and project management.
Experience
Professional experience10+ years
Freelancer since2016
Languages
EnglishNative speaker
Project history
Developed a cross-platform mobile application using React Native and Expo with Django backend and Stripe payment gateway. Built a modern full-stack web platform using React.js, TypeScript, Refine.dev, and MUI connected to a Strapi headless CMS deployed on Fly.io. Integrated OpenAI APIs for an intelligent AI Chatbot feature. Implemented end-to-end CI/CD pipelines with Docker and Fly.io.
Developed a modern web application and admin panel using React.js, TypeScript, and Tailwind CSS with Nest.js and Next.js for SSR. Implemented AI Chatbot workflows using LLM, Langchain, Pinecone Vector Database, and Azure OpenAI. Integrated GraphQL Apollo Client and developed RESTful APIs using Django. Leveraged Agile methodologies and Scrum practices for efficient project execution.
Part of the team that developed the Platform Insights application, an in-house platform helping Uber teams discover and understand data related to various data entities. Employed Fusion.js and Vue.js for the frontend, implemented Vuex for state management, and designed RESTful APIs using FastAPI. Conducted rigorous testing using Jest and Enzyme.