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.

1. In Short
2. 100% REMOTELY or from one of our 2 offices
3. 💰 Senior: 120 - 160 pln/h
4. ☑️ B2B contract

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.