Senior Full-Stack Developer (React + .NET)

Quick Facts

• Role: Senior Full-Stack Developer (React + .NET)

• Work model: 100% remote or from offices (Wrocław or Bielsko-Biała)

• Contract: B2B

• Rate: 120–160 PLN/hour

Description

You will build and extend a cloud-based FinTech SaaS platform for banks and financial institutions. This role focuses on designing microservices-based web solution architecture, developing new features with .NET and React, and building high-performance front-end and back-end services through well-designed APIs. You’ll work in a Scrum team across the full production lifecycle, including testing and technical documentation.

Responsibilities

• Design web solution architecture using best practices, microservices, and cloud services

• Develop within a SaaS product platform

• Implement new functionality with .NET and React

• Design, develop, and maintain APIs, services, and systems on a cloud platform

• Build high-performance front-end and back-end solutions

• Prepare tests and technical documentation

• Collaborate in a Scrum team across the entire production lifecycle

Requirements

• 4+ years of commercial programming with .NET/C# and React/TypeScript

• Strong understanding of software architecture and backend design patterns (dependency injection, repository, mediator, factory)

• Cloud exposure (Azure or AWS) and knowledge of infrastructure/services

• English and Polish fluency (minimum B2+)

• Hands-on CQRS and Domain-Driven Design (DDD) experience

• Understanding of event sourcing concepts (event stores, event replay, modeling state via immutable events)

• Solid clean architecture and separation of concerns knowledge

• Experience with PostgreSQL and modern ORM frameworks (e.g., Entity Framework)

• Exposure to CosmosDB or similar NoSQL/document databases

• Experience designing and consuming RESTful APIs

• Familiarity with Docker for local development and deployments

Benefits

• Work with latest technologies and international FinTech clients

• TechTalks, meet-ups, and knowledge-sharing guilds

• Close-knit team with regular integrations

• Flexible schedule (start between 7:00 and 10:00 am)

• Opportunity to work remotely or from offices, with occasional visits for meetings/client work

• Bonuses for employee referrals (3000–7000 PLN)

• Opportunity to author technical articles/blog content