Develop and maintain backend, web, and mobile solutions
Build secure and scalable backend services and REST APIs using C#, .NET, https://jobeax.com/link/GrYTXLZMpxEMJknV Web API, Entity Framework Core, and SQL Server
Develop responsive web and mobile features using React, React Native, TypeScript, JavaScript, HTML5, and CSS3
Develop business logic and optimize SQL Server database structures
Apply Clean Code, SOLID principles, and design patterns
Write and maintain unit and integration tests
Use AI-assisted development tools such as GitHub Copilot, Claude Code, ChatGPT, or OpenAI API to support development and improve workflows
Participate in technical discussions, code reviews, and task estimation
Collaborate with developers and other team members within a distributed international environment
Create and maintain technical documentation in Polish and English
Our requirements
Minimum 3 years of commercial software development experience
Strong experience with C# and .NET Core / .NET 8+
Experience with https://jobeax.com/link/GrYTXLZMpxEMJknV Web API, Entity Framework Core, and SQL Server
Practical experience with React and React Native
Good knowledge of TypeScript, JavaScript, HTML5, and CSS3
Knowledge of Clean Code, SOLID principles, and design patterns
Experience with unit and integration testing
Practical experience using AI-assisted development tools such as GitHub Copilot, Claude Code, ChatGPT, or OpenAI API
Fluent Polish – mandatory
Minimum B2 level of English, both written and spoken
Ability to work independently and effectively in a fully remote environment
Strong communication and collaboration skills
Optional
Knowledge of Domain-Driven Design (DDD) and CQRS
Experience with microservices architecture and cloud-native solutions
Experience with Microsoft Azure services, such as App Services, Service Bus, Azure SQL, and Azure DevOps
Knowledge of Docker and containerization
Familiarity with Azure Cosmos DB and Cloud/DevOps patterns
Interest in integrating AI/ML into commercial applications
Experience in fitness, health & wellness, or other B2C solutions
Experience publishing or maintaining applications in the App Store and Google Play
What we offer
100% remote working model
Full-time cooperation agreement based on B2B
Opportunity to work on an international project for a US-based client
Opportunity to work with modern .NET, React, and React Native technologies
Collaboration within a distributed international team
Opportunity to develop your skills in modern software development and AI-assisted engineering
, Wycena pracochłonności planowanych zmian w systemach informatycznych. , Znajomość narzędzi z obszarów diagnozy i analizy błędów: Kibana, Elasticsearch. , Znajomość serwerów aplikacji (Tomcat). , Krótki proces rekrutacji.
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... Cyclad, we work with top international IT companies to help them deliver modern digital products and innovative technologies. We are currently looking for a Mid Fullstack Developer to join a distributed international team working on a modern digital product for the fitness industry., , In this role, you will contribute to the ...
NET O projekcie, Do naszego zespołu IT szukamy osoby, która lubi pisać kod, ale jeszcze bardziej lubi, kiedy ten kod do czegoś służy. Budujemy dla klientów narzędzia, które dają nam realną przewagę na rynku. , , U nas GenAI to codzienna praca, a nie slajd w prezentacji.
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, SD Worx values diversity and inclusion in the workplace. , All hiring decisions are made based on skills, experience and role‑related qualifications.