Senior Fullstack .NET Developer

MARGO; Województwo mazowieckie; Hybrid; PLN 180,000 - 240,000; Full time

Job summary

An international IT consulting company is seeking a Senior Fullstack .NET Developer for a long-term banking project in Poland. The ideal candidate will have strong experience with C#, .NET technologies, and Angular. Responsibilities include designing and maintaining backend services, collaborating on architectural decisions, and ensuring high standards of code quality. This role supports a remote-first work model with occasional onsite collaboration days, offering a competitive hourly rate.

Benefits

Long-term cooperation on stable banking project

Remote-first work model

Regular on-site collaboration days

Qualifications

• Strong commercial experience with C#, .NET Core, and .NET Framework.
• Senior-level experience with Angular and JavaScript.
• Solid knowledge of SOLID principles, design patterns, IoC, DI.
• Advanced experience with unit testing and automated E2E testing (Cucumber).
• Strong REST API development skills.
• Proven experience with microservices architecture.
• Advanced experience with Docker and Kubernetes.
• Good knowledge of CI/CD processes.
• Experience with Git, Jira, TeamCity, Jenkins.

Responsibilities

• Design, develop, and maintain backend services using C#, .NET Core, and .NET Framework.
• Build and extend frontend components using Angular and JavaScript.
• Design and implement REST APIs.
• Develop and maintain microservices-based systems.
• Create and maintain unit and automated E2E tests.
• Take ownership of code quality and code review standards.
• Collaborate closely with DevOps, QA, Analysts, and Product teams.

Skills

C#

.NET Core

.NET Framework

Angular

JavaScript

REST API development

microservices architecture

unit testing

automated E2E testing (Cucumber)

Docker

Kubernetes

CI/CD processes

Git

Jira

TeamCity

Jenkins

Job description

About MARGO

MARGO is an international IT consulting company founded in Paris in 2005, with offices in London and Warsaw. We specialize in delivering highly skilled IT experts to complex enterprise projects across Europe. At MARGO, we focus on long-term partnerships, transparency and technical excellence.

120 zł - 135 zł an hour

About the project

We are currently looking for a Senior Fullstack .NET Developer to join a long-term enterprise banking project. You will work in a complex microservices environment, supporting large-scale distributed systems and contributing to high-quality, production‑grade solutions.

This role is designed for an experienced engineer who takes ownership, actively participates in architectural decisions, and maintains high standards of code quality and testing.

Your responsibilities

• Design, develop and maintain backend services using C#, .NET Core and .NET Framework
• Build and extend frontend components using Angular and JavaScript
• Design and implement REST APIs
• Develop and maintain microservices-based systems
• Create and maintain unit and automated E2E tests (Cucumber)
• Participate in technical and architectural decision-making
• Take ownership of code quality and code review standards
• Work with CI/CD pipelines and deployment automation
• Collaborate closely with DevOps, QA, Analysts and Product teams
• Support less experienced developers through technical guidance and knowledge sharing

Must have (Requirements)

• Strong commercial experience with C#, .NET Core and .NET Framework
• Senior-level experience with Angular and JavaScript
• Solid knowledge of SOLID principles, design patterns, IoC, DI
• Advanced experience with unit testing and automated E2E testing (Cucumber)
• Strong REST API development skills
• Proven experience with microservices architecture
• Advanced experience with Docker and Kubernetes
• Experience working in enterprise-scale projects
• Good knowledge of CI/CD processes
• Experience with Git, Jira, TeamCity, Jenkins

Nice to have

• Experience with cloud platforms (Azure, GCP)
• Ansible or GitHub Actions
• PowerShell
• Enterprise integration experience
• Linux/ Windows administration basics

What we offer

• Long-term cooperation on stable banking project
• Remote-first work model with regular on-site collaboration days
• Employment or