Senior Full-Stack .NET/React Engineer (Hybrid, Warsaw)

Belvedere Recruitment; Warszawa; Hybrid; PLN 335,000 - 469,000; Full time

Job summary

Belvedere Recruitment seeks an experienced Full Stack Developer to join their Warsaw-based team on a 2-month contract, hybrid work setup. You will design backend APIs with .NET/C#, and deliver frontend features using React and TypeScript.

You’ll model data across SQL/NoSQL databases and ensure secure API design while integrating cloud services. The role emphasizes end-to-end ownership, collaboration with cross-functional teams, and delivering robust, security-conscious solutions for financial

Qualifications

• 6-8 years of software development experience.
• Strong proficiency in .NET and C# fundamentals.
• Experience building ASP.NET Core Web APIs.
• Strong React and TypeScript skills.
• Experience with SQL and NoSQL databases and data modelling.
• Knowledge of cloud platforms and services.
• Security-aware with secure API design.
• Ability to work independently on end-to-end tasks.

Responsibilities

• Design and implement backend APIs and business logic using .NET and C#.
• Build and integrate frontend functionality using React and TypeScript.
• Model data and optimise queries across SQL and NoSQL databases.
• Deliver complete features spanning backend, frontend, and integration boundaries.
• Troubleshoot and resolve production issues across multiple application layers.
• Contribute to code reviews, testing strategies, and technical quality standards.
• Support integration with external systems and cloud-connected services.
• Apply security best practices including secure API design and tenant-boundary thinking.

Skills

.NET & C# fundamentals

ASP.NET Core Web API

React & TypeScript

SQL & NoSQL databases

Cloud platforms & services

Debugging & problem solving

Secure API design

Independent work

6-8 years experience

Tools

MongoDB

Azure SQL

Azure App Services

Azure Storage

Key Vault

Monitoring tools

Job description

Belvedere Recruitment seeks an experienced Full Stack Developer to join their Warsaw-based team on a 2-month contract, hybrid work setup. You will design backend APIs with .NET/C#, and deliver frontend features using React and TypeScript.

You’ll model data across SQL/NoSQL databases and ensure secure API design while integrating cloud services. The role emphasizes end-to-end ownership, collaboration with cross-functional teams, and delivering robust, security-conscious solutions for financial