April 10, 2026
Senior Full Stack Developer (React & .NET Core) (m/k/n)
Senior • Remote
900 - 1,150 PLN
Warsaw, Poland
About the Role
We are seeking a highly experienced Senior Full Stack Developer with deep expertise in React on the frontend and C# .NET Core on the backend. The ideal candidate will have substantial hands-on experience developing scalable applications, strong exposure to cloud-native architectures, and a solid understanding of capital markets—particularly in credit risk and market risk domains. Experience with Python (pyspark) for data-driven workflows and a strong command of CI/CD, microservices, and event-driven architectures is essential.
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Key Responsibilities
Design, develop, and maintain full stack applications using React, C#.NET Core, and supporting technologies.
Build high-performance backend services, RESTful APIs, and microservices with focus on scalability, maintainability, and resilience.
Develop responsive, modular, and accessible UI components using React and modern JS/TS patterns.
Collaborate closely with business stakeholders and risk domain experts to deliver solutions in credit risk, market risk, and related capital markets functions.
Work with Python (pyspark) for data transformation, data pipelines, and analytics workflows.
Develop, optimize, and maintain Power BI dashboards, data models, and analytical reports for business users.
Implement and optimize CI/CD pipelines, ensuring robust automated testing, deployment, and monitoring.
Architect and contribute to event-driven and distributed system designs using technologies such as Kafka, Event Hub, or similar.
Drive engineering best practices: code reviews, unit/integration testing, performance tuning, documentation.
Contribute to cloud migration and modernization initiatives, especially in Azure or AWS environments.
Mentor junior developers and collaborate within a cross-functional agile team.
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Required Skills & Experience
Technical Skills
10+ years of professional software development experience.
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Front-end:
Strong proficiency in React.js, JavaScript/TypeScript, Redux/RTK, hooks, and modern UI patterns.
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Back-end:
Expertise in C# .NET Core, C#, REST APIs, Web APIs, and microservices-based development.
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Python (pyspark):
Hands-on experience with distributed data processing, data pipelines, and analytic transformations.
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Power BI:
Extensive experience developing dashboards, data models, DAX calculations, and enterprise-grade BI solutions.
Strong understanding of data modeling, performance tuning, and governance in Power BI.
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Architecture:
Strong knowledge of microservices, API design, event-driven architectures, and distributed systems.
-
DevOps / CI/CD:
Experience with Azure DevOps, GitHub Actions, Jenkins, or similar.
Strong understanding of automated builds, testing, deployment, and monitoring.
-
Cloud Platforms:
Experience with Azure or AWS (Azure preferred).
-
Databases:
Proficiency with SQL Server, PostgreSQL, or other relational databases; NoSQL knowledge a plus.
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Containerization:
Experience with Docker, Kubernetes, container orchestration.
Domain Knowledge
-
Understanding of capital markets, specifically:
Credit risk (PD, LGD, EAD, credit exposure modeling, counterparty risk).
Market risk (VaR, sensitivities, stress testing, pricing concepts).
Familiarity with regulatory frameworks (e.g., Basel, FRTB, IFRS9) is a strong advantage.
________________________________________
Soft Skills
Strong analytical and problem solving abilities.
Excellent communication skills and ability to interact with technical and non-technical stakeholders.
Collaborative, agile mindset with experience in Scrum/Agile environments.
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Ability to work independently and lead technical solutions end to end.
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Krakow, Poland
1,350 - 1,600 PLN
🏢 Summary: Senior Full Stack Developer role focused on designing, building, and enhancing enterprise-level applications using .NET and React. The position involves contributing to architecture decisions, improving performance and usability, and ensuring application reliability across the full technology stack. It includes ownership of backend services, frontend development, CI/CD processes, and production support. 🗂️ Requirements: Minimum 5 years of professional experience in .NET application development, Strong proficiency in C# and Web API, Hands-on experience with React for web application development, Advanced knowledge of SQL Server and database architecture, Experience with CI/CD pipelines, Understanding of Software Development Life Cycle, Proficiency in HTML5 and CSS, Experience in system architecture and design patterns, Ability to troubleshoot production issues 📃 Skills: .NET, C#, WebAPI, React, SQL, SQLServer, CI/CD, HTML5, CSS, SDLC 🏢 Description: We Are Hiring: Senior Full Stack Developer (.NET and React) We are seeking an experienced Full Stack Developer who is ready to play a key role in designing, building, and improving enterprise-level applications. This position is ideal for someone who enjoys working across the entire technology stack, contributing to architectural decisions, enhancing user experiences, and ensuring application reliability and performance. This is a senior-level opportunity for a professional who combines deep technical expertise with strong analytical thinking and a proactive mindset. Key Responsibilities Contribute to system architecture planning and technical design discussions Drive user interface enhancements to improve usability, performance, and overall application resilience Apply industry-recognized design principles and architectural patterns when implementing solutions Review and interpret business and technical requirements, proposing improvements where appropriate Produce clear and detailed technical documentation for developed features and systems Build proof-of-concept solutions and prototypes to validate architectural approaches Oversee and manage system modifications within structured service management processes Support and enhance automation initiatives across development and operational workflows Deliver high-quality technical support, ensuring timely resolution of issues Collaborate closely with stakeholders to understand objectives and provide effective solutions Required Qualifications and Experience A minimum of Five years of professional experience developing and maintaining production-grade applications within the .NET ecosystem Strong proficiency in C# and Web API development, with experience building secure, scalable, and high-performing backend services Solid hands-on experience with React, developing dynamic, responsive, and performance-optimized web applications Advanced knowledge of database architecture and SQL Server, including complex query development, performance optimization, and tuning Practical experience with continuous integration and continuous delivery pipelines Comprehensive understanding of the Software Development Life Cycle, from requirements analysis through deployment and ongoing support Strong command of modern web standards including HTML5 and Cascading Style Sheets, with the ability to create intuitive user interfaces Excellent analytical and troubleshooting abilities, particularly in demanding production environments High attention to detail and commitment to delivering robust, maintainable solutions If you are passionate about developing high-quality software, improving system performance, and contributing to meaningful technical decisions, we would welcome the opportunity to connect with you. Please feel free to reach out directly or share this opportunity within your professional network. #Hiring #FullStackDeveloper #DotNet #React #SoftwareEngineering #TechnologyCareers