Senior Fullstack .NET Developer with React Expertise

Senior • Hybrid

20,160 - 21,840 PLN

Lodz, Poland

Unleash innovative web solutions — shape the future of digital banking experiences!

Łódź-based opportunity with hybrid work model (2 days in the office/month).

As a Senior Fullstack .NET Developer (React), you will be working for our client, a leading financial institution focused on delivering innovative digital banking solutions. You will join a strategic modernization initiative involving the redevelopment of a business process management platform. The project focuses on rebuilding legacy applications from .NET Framework to modern .NET technologies, migrating infrastructure from on-premises environments to Kubernetes, and implementing high-quality engineering practices. You will collaborate closely with AI-powered development tools, contribute to system design decisions, and help deliver scalable, secure, and maintainable solutions in a complex enterprise environment.

Your main responsibilities:

Develop and maintain backend services using .NET and C#
Rebuild legacy applications from .NET Framework to modern .NET architecture
Design and implement frontend components using React
Create and maintain automated unit and regression tests
Collaborate with business stakeholders to analyze and refine requirements
Design scalable and maintainable software solutions
Integrate applications with databases and external services
Utilize LLM-based tools such as Claude and Codex to support software development activities
Participate in code reviews and ensure adherence to development standards
Deploy and support applications running in Kubernetes environments
Work closely with cross-functional teams in an Agile delivery model

You're ideal for this role if you have:

At least 5 years of experience in software development using C# and .NET
Experience with .NET Framework and modernizing legacy code
Good knowledge of React
Practical experience working with LLM tools such as Claude and Codex
Strong experience with automated testing
Hands on experience with Docker and Kubernetes
Experience designing and implementing enterprise applications
Strong knowledge of MS SQL
Experience using Git, JIRA, and TeamCity
Ability to work independently while collaborating effectively within a team
English skills sufficient to write and understand technical documentation

Nice to have:

Knowledge of message brokers, especially RabbitMQ,

ITDS

ITDS Business Consultants is a company that operates within the IT consulting industry, focusing on delivering innovative and professional IT projects for international companies, particularly in the financial sector across Europe. The company is committed to providing an environment that fosters professional growth, ambition, and drive. ITDS is involved in strategic projects that are crucial to the market, offering opportunities for skill enhancement and expertise development. The company values stable and long-term cooperation, providing a supportive environment for career development. ITDS also emphasizes a collaborative and international work environment, with access to various benefits such as medical packages, sports programs, and flexible working conditions. The company is dedicated to aligning its solutions with business needs and maintaining high standards in its development practices.

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