Senior Backend Engineer — Cloud-Native, Scalable APIs

EasySoftGroup; Kraków; Hybrid; PLN 240,000 - 360,000; Full time

Benefits offered by this job

Hybrid work model

Global teams

Career growth

Learning stipend

Job summary

EasySoftGroup in Kraków is seeking a Senior Backend Software Engineer to design, build, and scale cloud-native backend systems for our SaaS platform. You will influence architecture, improve performance, and deliver robust services that support high-traffic applications.

This role combines hands-on engineering with architectural influence. You will collaborate with frontend engineers, product managers, and distributed teams in a fast-paced, agile environment to deliver reliable solutions and

Qualifications

• 5+ years of backend software engineering experience.
• Proficiency in C#, .NET, and ASP.NET Core.
• Experience building web apps and APIs.
• Strong understanding of distributed systems and cloud-native architecture.
• Hands-on AWS experience.
• Experience with relational databases (SQL Server) and EF ORM.

Responsibilities

• Design, develop, and maintain scalable backend services using C# and .NET.
• Build and optimize RESTful APIs for modern frontends.
• Architect microservices with modular, resilient design.
• Develop with AWS cloud services.
• Ensure highly available, secure, and performant systems.
• Collaborate with frontend engineers for smooth API integration.
• Partner with product/design to translate business needs into technical solutions.
• Participate in architecture discussions, code reviews, and agile ceremonies.
• Write clean, tested code following best practices.
• Implement automated testing (unit/integration/e2e).
• Reduce technical debt and improve long-term sustainability.
• Monitor and improve system performance and scalability.

Skills

C#

ASP.NET Core

REST APIs

Distributed systems

Web backend

Code reviews

Event-driven design

Tools

AWS

Terraform

Docker

Kubernetes

GitHub Actions

TeamCity

Elasticsearch

Job description

EasySoftGroup in Kraków is seeking a Senior Backend Software Engineer to design, build, and scale cloud-native backend systems for our SaaS platform. You will influence architecture, improve performance, and deliver robust services that support high-traffic applications.

This role combines hands-on engineering with architectural influence. You will collaborate with frontend engineers, product managers, and distributed teams in a fast-paced, agile environment to deliver reliable solutions and