Senior Fullstack Developer (Python + React)

At Cyclad, we work with top international IT companies to help them deliver cutting-edge technologies that shape the future. We are currently looking for an experienced Senior Fullstack Developer to join an international team working on a state-of-the-art AI-enabled application.In this role, you will work across the full technology stack, developing backend services and APIs using Python and modern frontend applications using React. You will contribute to transforming exploratory Proof-of-Concepts developed by Data Scientists into robust, scalable, production-ready solutions while working with Generative AI, Large Language Models (LLMs), cloud-native architectures, and intelligent process automation.Project information:Type of project: IT servicesOffice locations: Gdańsk, Poznań, or Wrocław, PolandWork model: Hybrid – 2 days per week in the office, 3 days remotelyBudget: 100–160 PLN net/hour – B2BProject length: Long-termStart date: ASAP (depending on the candidate's availability)Seniority level: SeniorOnly candidates with citizenship in the European Union and residence in PolandYour responsibilities:Design, develop, and maintain full stack solutions using Python and ReactDevelop and maintain backend services and RESTful APIs using PythonBuild modern, responsive, and user-friendly React applicationsIntegrate frontend applications with backend APIs and AI-driven functionalityCollaborate with Data Scientists to understand exploratory POCs, models, and notebooksTransform experimental data science code and notebooks into production-ready, maintainable systemsRefactor and productionize exploratory code, including Streamlit applications, scripts, and prototypesImplement scalable and maintainable backend business logicContribute to technical design decisions across both backend and frontend architectureCollaborate with Cloud Engineers on deployment setup, runtime architecture, environment configuration, and CI/CDSupport data-intensive application workflows and system integrationsEnsure application components meet requirements for security, observability, scalability, and operational supportabilityParticipate in testing, troubleshooting, performance optimization, and continuous improvementWork closely with Data Scientists, AI Engineers, Cloud Engineers, Product Owners, and other developersRequirements:5+ years of professional experience in full stack developmentStrong hands-on experience with both Python backend development and React frontend developmentExperience with a modern Python web frameworkStrong experience designing, building, and maintaining REST APIsSolid experience building modern React applications, including state management, hooks, and API integrationPractical experience working with AWS and cloud-based application environmentsExperience transforming exploratory or experimental code into production-ready systemsGood understanding of full stack architecture, system integration patterns, and interface designExperience with Git and Agile software development practicesUnderstanding of scalable, secure, and maintainable application developmentExcellent communication skills in EnglishAbility to work effectively in a cross-functional international team involving Data Science, AI, Backend, Frontend, Cloud, and Product stakeholdersNice to have:Experience with data pipelines or data-intensive applicationsExperience working with AI/ML-oriented systems, including inference endpoints, model-serving components, or LLM-based workflowsExperience with Snowflake or similar cloud data platformsFamiliarity with SAP-related interfaces or enterprise integration technologies such as OData, APIs, IDoc, RFC, or BAPIExperience with Docker and containerized application deliveryExperience with CI/CD pipelines and automated deployment practicesKnowledge of secure API design, authentication, and authorization patternsExperience with data visualization in React or other frontend technologies for presenting AI/ML outputs to end usersWe offer:Hybrid working model with 2 days per week in the officeFull-time cooperation agreement based on B2BPrivate medical care with dental care (covering 70% of costs)Multisport card (also for an accompanying person)Life insuranceOpportunity to work on innovative AI-powered solutions in an international IT environmentRecruitment process:Introductory callTechnical interviewFinal decision