New offer - be the first one to apply!

August 8, 2026

Fullstack Developer (Python / FastAPI / Next.js)

Senior • Remote

23,000 - 27,000 PLN

Wroclaw, DS, Poland

Your Responsibilities

  • Design and develop full-stack applications using FastAPI and Next.js.
  • Build and maintain REST APIs with FastAPI.
  • Design and implement ETL pipelines for data processing.
  • Integrate LLMs with OpenAI and build AI-powered features using LangChain.
  • Work with data science workflows, including NumPy, data modeling, and analytics.
  • Design database structures using MongoDB and PostgreSQL.
  • Deploy and maintain infrastructure on Azure.
  • Contribute to architectural and product decisions.

Requirements

Must-have

  • Python: 6+ years of experience.
  • FastAPI: experience building backend services and APIs.
  • JavaScript / Next.js: 4+ years of full-stack frontend development.
  • LLMs / OpenAI: 2+ years of practical AI-model integration experience.
  • Data Science: 5+ years, including NumPy and analytical workflows.
  • MongoDB: 3+ years of schema design and querying.
  • Azure: 6+ years of cloud infrastructure experience.

Nice-to-have

  • LangChain: building LLM-powered pipelines and agents.
  • Databricks / Spark: large-scale data processing.
  • Terraform: infrastructure as code.
  • PostgreSQL: relational database experience.
  • Kubernetes: container orchestration.
  • NLP: natural language processing techniques.
  • Django / Flask: additional Python web frameworks.
  • C# / C++: backend or systems programming background.
  • Orleans / SignalR: distributed systems or real-time communication.
  • ELK Stack: logging and observability.
  • CQRS, SOLID, OOD, and Design Patterns: architectural fundamentals.
  • CI/CD: automated build and deployment pipelines.
  • Cybersecurity: security-aware development practices.
  • IoT: 4+ years of exposure to IoT-related systems.

Tech Stack

  • Frontend: Next.js, JavaScript.
  • Backend: Python, FastAPI, Django / Flask.
  • AI / Data: OpenAI, LangChain, Data Science, NumPy, NLP, Databricks, Spark.
  • Databases: MongoDB, PostgreSQL.
  • DevOps / Cloud: Azure, Terraform, Kubernetes, CI/CD.
  • Other: Orleans, SignalR, ELK Stack, CQRS, IoT, Cybersecurity.

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Warsaw, Poland

120 - 134 PLN

🏢 Summary: Short-term (3–4 months) full-stack contract focused on building and enhancing secure backend and frontend features using Python and modern web technologies. The role involves developing REST APIs, implementing robust authentication mechanisms, and integrating security controls within cloud or hybrid environments. Collaboration with DevOps teams ensures reliable, secure deployments and scalable architectures. 🗂️ Requirements: Strong experience with Python and FastAPI, Proven experience building and consuming REST APIs, Experience with PostgreSQL and relational database design, Knowledge of OAuth2, OIDC, RBAC, and SSO integration, Experience with Docker and Kubernetes, Familiarity with CI/CD pipelines, Experience with software supply chain security practices, Ability to work in cloud or hybrid infrastructure environments 📃 Skills: Python, FastAPI, REST, PostgreSQL, OAuth2, OIDC, RBAC, SSO, Docker, Kubernetes, CI/CD, GitHub, GitLab, React, TypeScript, Next.js 🏢 Description: Full-stack Developer 3-4 months contract with possibility for extension Technical Requirements Strong experience with Python , especially FastAPI Proven experience building and consuming REST APIs Experience with PostgreSQL and relational database design Knowledge of authentication and security standards: OAuth2 , OIDC , RBAC , SSO integration Experience with DevOps tooling: Docker and Kubernetes Familiarity with CI/CD pipelines (GitHub Actions, GitLab CI or similar) Experience with software supply chain security: artifact validation, signature verification, compliance scanning, sandboxed execution Ability to work in cloud or on-prem / hybrid infrastructure environments Nice to have: Frontend experience with React , TypeScript , Next.js or similar SPA frameworks Required Technical Skills Python, Fast API, RESTful APIs, PostgreSQL, Docker, Kubernetes, CI/CD Main Responsibilities Designing and developing full-stack features across frontend and backend components Building and maintaining backend services using Python (FastAPI) and REST APIs Developing scalable data models and service architectures Implementing secure authentication and authorization mechanisms Integrating security controls and package validation tooling into the development lifecycle Working in collaboration with DevOps and infrastructure teams to ensure reliable deployments