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.

________________________________________

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.

________________________________________

Required Skills & Experience

Technical Skills

  • 10+ years of professional software development experience.

  • Front-end:

    • Strong proficiency in React.js, JavaScript/TypeScript, Redux/RTK, hooks, and modern UI patterns.

  • Back-end:

    • Expertise in C# .NET Core, C#, REST APIs, Web APIs, and microservices-based development.

  • Python (pyspark):

    • Hands-on experience with distributed data processing, data pipelines, and analytic transformations.

  • 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.

  • 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.

  • 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.

  • Ability to work independently and lead technical solutions end to end.

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Warsaw, Poland

35,000 - 40,000 PLN

🏢 Summary: Senior Fullstack Engineer role in a global investment firm focused on building and modernizing high-performance financial platforms. The position involves end-to-end development across backend and frontend, optimizing financial data systems, and contributing to cloud-based, distributed architectures. The role combines enterprise engineering with modern cloud and streaming technologies in a global, agile environment. 🗂️ Requirements: 7+ years of professional full-stack development experience, Hands-on experience with C# and .NET, Hands-on experience with Node.js, Hands-on experience with React, Strong knowledge of SQL Server and T-SQL, Experience designing scalable server-side applications, Experience optimizing high-throughput databases, Ability to participate in architecture and design reviews, Professional English proficiency 📃 Skills: C#, .NET, Node.js, ReactJS, AngularJS, SQL, T-SQL, SQLServer, Cloud, Containers, DataStreaming, AI, ML 🏢 Description: About the Role & Project We are recruiting for a leading global alternative investment firm (Hedge Fund) that is modernizing capital markets. We are not looking for a traditional, single-stack developer. We need a Senior Fullstack Engineer who comfortably bridges the gap between robust enterprise systems and cutting-edge cloud/AI solutions. You will join an agile tech team building high-performance platforms where your code directly impacts complex, global financial systems. Tech Stack Backend: C# / .NET, Node.js Frontend: ReactJS (with occasional legacy AngularJS maintenance) Data: SQL Server, T-SQL Architecture: Cloud, Containers, Data Streaming Key Responsibilities End-to-End Dev: Design and scale server-side apps (Node.js/.NET) and build responsive UIs (React). Data & Perf: Optimize high-throughput SQL Server stored procedures for financial data. Modernization: Leverage streaming and cloud technologies to build resilient, distributed platforms. Architecture: Take an active role in tech design reviews, architecture discussions, and mentoring. Requirements 7+ years of professional full-stack development experience. Hands-on mastery of C#/.NET, Node.js, React, and T-SQL. Engineering standards: Strong analytical skills, clean code mindset, and solid application design focus. Communication: Excellent English skills to collaborate smoothly with international teams. Bonus Points: Experience or interest in integrating AI/ML models into enterprise apps. Prior background in FinTech, banking, or trading environments . What We Offer Financial & Future: Private pension scheme, life & travel insurance, educational assistance reimbursement. Health & Wellness: Premium medical & dental package (with vision allowance) + MultiSport card. Culture & Perks: Pre-funded lunch card, Employee Assistance Program, volunteer opportunities, and active DEI affinity groups. If interested, please click apply! :)