FullStack .NET + React Developer

Madiff; Warszawa; On-site; PLN 167,400 - 223,200; Full time

Job summary

A leading digital transformation company is looking for an experienced FullStack .NET Developer to contribute to a greenfield project in banking. You will build a modern system using .NET 6/8 and React, integrating with enterprise platforms. Requirements include 5+ years in .NET development, strong REST skills, and fluency in Polish and English. This role offers a hybrid work model and long-term contract opportunities.

Qualifications

• 5+ years of experience in .NET development.
• Ability to work with microservices-based architecture.
• Familiarity with Agile/SCRUM environments.

Responsibilities

• Build scalable backend features in .NET 6/8.
• Develop clean, reusable components in React.
• Implement and integrate REST/SOAP services.

Skills

Strong skills in .NET 6/8

Expertise in REST

Hands-on experience with React

Familiarity with Kafka

Understanding of enterprise system integration and APIs

Fluency in Polish and English (B2 level or higher)

Tools

SQL Server

Entity Framework

Job description

We’re looking for an experienced FullStack .NET Developer to join a greenfield digital transformation project in the corporate banking sector.

You’ll help build a modern, high-performance system from scratch using .NET 6/8, React, Kafka, and microservices integrated with multiple enterprise platforms — a project that will have a long-term impact on thousands of users.

Responsibilities

• Build scalable backend features in .NET 6/8 and contribute to a microservices-based architecture
• Develop clean, reusable components in React integrated with REST APIs
• Implement and integrate REST/SOAP services and event‑driven systems with Kafka
• Work closely with analysts, architects, and business stakeholders on requirements and design
• Participate in testing, deployment, and optimisation to ensure high system performance

Requirements

5+ years of experience in .NET development

Strong skills in .NET 6/8, REST, SOAP, SQL Server, Entity Framework

Hands‑on experience with React

Familiarity with Kafka and distributed/microservices architecture

Understanding of enterprise system integration and APIs

Fluency in Polish and English (B2 level or higher)

Nice to have

• Experience in banking or financial systems
• Knowledge of secure systems or mobile banking
• Familiarity with DDD, event storming, or user story mapping
• Experience working in Agile/SCRUM environments
• Fully remote or hybrid model
• Long‑term B2B contract with a stable project pipeline
• Work in a multilingual, multinational, and multicultural environment on international projects