Senior Fullstack Developer (.NET+React)

emagine; Polska; Remote; PLN 156,000 - 222,000; Full time

Job summary

emagine Group in Poland is seeking a senior .NET/React developer to help build a FinTech SaaS for international banks and financial institutions, focusing on robust web solutions. You will design architectures using microservices and cloud services, implement features in .NET and React, and craft secure RESTful APIs, with CQRS and DDD guiding the design.

The role requires strong English and Polish, cloud experience (Azure/AWS), and collaboration in a SCRUM team to deliver across the full

Qualifications

• Over 4 years of commercial programming experience with .NET, C#, React, and TypeScript.
• Strong understanding of software architecture principles and backend design patterns.
• Exposure to cloud environments (Azure or AWS).
• Fluency in English and Polish (minimum B2+).
• Hands-on experience with CQRS and Domain-Driven Design (DDD).
• Understanding of Event Sourcing concepts.
• Solid knowledge of clean architecture and separation of concerns.
• Experience with PostgreSQL and modern ORM frameworks.
• Exposure to CosmosDB or similar NoSQL/document databases.
• Experience designing and consuming RESTful APIs.
• Familiarity with Docker for local development and deployments.

Responsibilities

• Designing web solution architecture based on best practices, utilizing microservices and 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.

Skills

NET/C#

React

TypeScript

Cloud (Azure/AWS)

CQRS

DDD

Event Sourcing

PostgreSQL

NoSQL/CosmosDB

REST APIs

Docker

English+Polish (B2+)

Software architecture

Tools

Docker

Job description

• Tech industry
• Rate: up to 137 zł/h
• Start in December 2026
• Remote work

Summary

This role is crucial for the development of a FinTech application tailored for international banks and financial institutions, focusing on creating robust web solutions to enhance financial services.

Responsibilities

• Designing web solution architecture based on best practices, utilizing microservices and 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.

Must Haves

• Over 4 years of commercial programming experience with .NET, C#, React, and TypeScript.
• Strong understanding of software architecture principles and backend design patterns.
• Exposure to cloud environments (Azure or AWS).
• Fluency in English and Polish (minimum B2+).
• Hands-on experience with CQRS and Domain-Driven Design (DDD).
• Understanding of Event Sourcing concepts.
• Solid knowledge of clean architecture and separation of concerns.
• Experience with PostgreSQL and modern ORM frameworks.
• Exposure to CosmosDB or similar NoSQL/document databases.
• Experience designing and consuming RESTful APIs.
• Familiarity with Docker for local development and deployments.

Nice to Haves

• Experience with additional cloud platforms.
• Knowledge of front-end frameworks beyond React.
• Certifications in relevant technologies.

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