Senior Software Developer (.NET + React)

GATX Rail Europe; Województwo mazowieckie; On-site; PLN 212,404 - 318,606; Full time

Benefits offered by this job

Flexible working time including home office model

Professional development with wide range of trainings

Attractive workplace in the city centre

Job summary

GATX Rail Europe is looking for a Senior Software Developer (.NET + React) in Poland. The role involves designing and maintaining a cloud-based ERP solution, with a focus on software quality, automation, and scalability. Candidates should have 5+ years of experience, strong C# and React skills, and a DevOps mindset. GATX offers flexible working hours, opportunities for professional development, and a collaborative international working environment.

Qualifications

• 5+ years of experience as a full-stack software developer in international projects.
• Strong proficiency in C# / .NET (8+), ASP.NET Core, and Entity Framework Core.
• Solid frontend expertise with React, TypeScript, and modern build tools.

Responsibilities

• Design, develop, and maintain frontend, backend, and infrastructure code.
• Contribute to solution architecture with a focus on performance.
• Implement data replication mechanisms and integrations across systems.

Skills

C# / .NET

React

DevOps

AWS

PostgreSQL

Automated testing

CI/CD pipelines

TypeScript

Tools

Docker

Terraform

GitHub Actions

Jira

Confluence

Job description

Senior Software Developer (.NET + React)

GATX Rail Europe is a leading, full-service railcar lessor offering a high quality and diversified fleet to over 20 European countries. With an experienced, service-oriented team, we are focused on making railcar leasing and rail transport simple, efficient, and seamless thus we have strategically located offices across Europe. At GATX we empower, develop, and recognize our people, building a culture of excellence, accountability, and respect. We value diversity and open communication to create a collaborative environment. Together, we achieve more and embrace change by challenging the status quo.

Role Overview

The Senior Software Developer (.NET + React) is a key contributor to the design, development, and operation of a modern, cloud-based ERP solution. The role spans frontend, backend, and infrastructure responsibilities, with a strong focus on software quality, automation, scalability, and operational excellence.

Working closely with the .NET Technical Lead and cross-functional teams, the developer contributes to architecture decisions, ensures reliable CI/CD and infrastructure environments, and supports production systems in a highly integrated, international landscape.

Your main responsibilities:

• Design, develop, and maintain frontend, backend, and infrastructure code of a cloud-based ERP solution
• Contribute to solution architecture and technical design with a focus on scalability, maintainability, and performance
• Implement data replication mechanisms, messaging patterns, and integrations across systems
• Design, maintain, and optimize relational database schemas, queries, and migrations
• Build, operate, and enhance CI/CD pipelines, Docker images, and Terraform-based infrastructure
• Ensure high software quality through automated testing, code reviews, and adherence to best practices
• Monitor, troubleshoot, and support production systems; contribute to observability and incident resolution
• Collaborate with international, cross-functional teams to ensure end-to-end process integration and documentation

We offer:

• attractive and well equipped workplace in the heart of the city centre
• interesting job where you can meet diversified challenges and tasks every day
• international working environment, shaped by team work and a great atmosphere
• appropriate remuneration and social benefits of a modern company
• flexible working time including home office model
• close cooperation and exchange of experience with other skilled teams within the GATX group
• opportunity for professional development with wide range of trainings

You are a good fit if you have:

• 5+ years of experience as a full-stack software developer in international projects
• Strong proficiency in C# / .NET (8+), ASP.NET Core Web APIs, and Entity Framework Core
• Solid frontend expertise with React, TypeScript, and modern build tools (e.g. Nx, Vite, pnpm)
• Experience designing and optimizing relational databases (PostgreSQL or equivalent)
• Hands‑on experience with AWS and cloud‑native architectures (compute, networking, security, observability)
• Strong DevOps mindset with experience in Docker, Terraform, and CI/CD pipelines (e.g. GitHub Actions)
• Experience with automated testing (unit, integration, API, and/or E2E testing)
• Strong analytical mindset with the ability to understand, decompose, and solve complex business and technical problems
• Ability to translate business requirements into robust technical solutions
• Fluency in English

Nice to have:

• Experience with Azure AD / Entra ID, OData, Redis, or OpenTelemetry
• Exposure to AWS multi-account setups, hybrid/on‑prem integrations, or ERP systems
• Familiarity with Jira, Confluence, and agile development methodologies