Senior Fullstack Developer (.NET + React)

Sep 30, 2026 10 views

CSHARK Sp. z o.o. Senior Fullstack Developer (.NET + React)

We are looking for an experienced Senior Fullstack Developer (React+.NET). We value direct communication and an open approach to problem-solving.

Currently, we are working on an application for our international client in the FinTech industry, dedicated to banks and financial institutions.

Your Daily Missions

Designing web solution architecture based on best practices, using microservices and the cloud services.
Developing within a SaaS product platform.
Implementing new functionalities using .NET and React.
Designing, developing, and maintaining APIs, services, and systems on a cloud-based platform.
Building high-performance front-end and back-end solutions.
Preparing tests and technical documentation.
Being part of a SCRUM team that develops and delivers software solutions throughout the entire production lifecycle.

The Essentials We’re Seeking

Over 4 years of commercial programming experience with .NET, C#, React and TypeScript (but will be ok more experience in back-end).
Strong understanding of software architecture principles and backend design patterns (e.g., dependency injection, repository, mediator, factory).
Exposure to cloud environments (Azure or AWS) and understanding of infrastructure and services..
Fluency in English and Polish (minimum B2+) - a must.
Hands-on experience with CQRS and Domain-Driven Design (DDD), including aggregates, entities, value objects, and bounded contexts.
Understanding of Event Sourcing concepts - including event stores, event replay, and how to model state changes as immutable domain events.
Solid knowledge of clean architecture and separation of concerns.
Experience with PostgreSQL and modern ORM frameworks (e.g. Entity Framework or equivalent).
Exposure to CosmosDB or similar NoSQL/document databases.
Experience designing and consuming RESTful APIs.
Familiarity with Docker for local development and deployments.

Skills