At DAC.digital, we are constantly growing our business. As part of our growth strategy, we are strengthening our strategic partnership with a leading AI operating system provider.Key information:Salary:23 000 - 33 000 PLN net/month - pure B2B contractWorking hours: 4:00 PM – 8:00 PM (Polish time / CET) remaining 4 hours flexibleIt is vital that you have: fluency in English (min. C1); proficiency in Python and FastAPI for building RESTful services (OpenAPI, auth, middleware); strong experience with PostgreSQL (schema design, indexing, query optimization, migrations); proficiency in React and TypeScript, with solid HTML/CSS skills (responsive layouts, accessibility); familiarity with CI/CD pipelines for web apps (linting, testing, build and release automation); comfortable with Git-based workflows and modern development practices (code review, formatting, static typing); solid debugging and performance tuning skills across database, API, and frontend layers; experience building and maintaining production web applications and platforms. demonstrated ability to take features from design through implementation, testing, and deployment; experience collaborating with frontend, backend, and product teams on cross-functional projects; working in agile methodologies (Scrum, Kanban); high communication skills; eager to learn and share knowledge; willing to travel if necessary (conferences, coworking events, etc.). Nice to have: hands-on experience with Docker and Kubernetes for local development and deployment (Helm/ArgoCD a plus); experience with caching/queues (e.g., Redis) and background jobs. familiarity with monitoring and observability stacks for web systems (logs, metrics, dashboards, alerts); exposure to security best practices (OWASP, CSRF/CORS, secrets management) and rollback strategies. Technology stack: Python FastAPI PostgreSQL React TypeScript HTML/CSS CI/CD Git You will be responsible for supporting our team in: design, build, and maintain scalable web infrastructure using FastAPI and PostgreSQL, ensuring robust API versioning, migrations, and deployment workflows across multiple environments; collaborate with frontend and backend teams to deliver production-ready APIs, UI components, and system integrations based on technical requirements; drive automation and system reliability by implementing CI/CD pipelines, test coverage (unit, integration, E2E), monitoring tools, and alerting systems; optimize system performance and cost by profiling bottlenecks across database, APIs, and React-based UI; implement caching strategies and efficient resource usage in cloud or hybrid setups; produce and maintain clear technical documentation, including API specs, coding standards, development workflows, migration guides, and troubleshooting runbooks. What do we offer: possibility to work 100% remotely or on-site at our office in Gdańsk; private Medical care; group insurance; pre-paid card or Sport Card; referral program; real Agile practices; employee well-being online platform; cafeteria benefits.