Senior .Net Engineer

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

We are seeking an experienced Senior Backend Software Engineer to design, build, and scale cloud-native backend systems for our SaaS platform. You will play a key role in shaping system architecture, improving performance, and delivering robust services that support high-traffic, customer-facing applications.

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

Key Responsibilities

• Design, develop, and maintain scalable backend services using C# and .NET (6+)
• Build and optimise RESTful APIs to support modern frontend applications
• Architect and implement microservices-based systems with a focus on modularity and resilience
• Develop and deploy solutions leveraging AWS cloud services
• Ensure systems are highly available, secure, and performant
• Collaborate with frontend engineers to ensure smooth API integration and performance
• Partner with product and design teams to translate business requirements into technical solutions
• Participate in architecture discussions, code reviews, and agile ceremonies
• Write clean, maintainable, and well-tested code following industry best practices
• Implement automated testing strategies (unit, integration, end-to-end)
• Identify and reduce technical debt, improving long-term system sustainability
• Monitor and improve system performance, reliability, and scalability
• Stay current with emerging technologies and contribute to continuous improvement initiatives

Required Qualifications

• 5+ years of experience in backend software engineering (web or SaaS environments)
• Strong proficiency in C#, .NET, ASP.NET Core
• Experience building and maintaining web-based applications and APIs
• Solid understanding of distributed systems and cloud-native architecture
• Hands-on experience with AWS
• Experience designing and implementing event-driven systems
• Strong knowledge of relational databases (e.g., SQL Server) and ORM tools (e.g., Entity Framework)

Preferred Qualifications

• Experience with AWS services such as Lambda, API Gateway, DynamoDB, and Elasticsearch
• Familiarity with Infrastructure as Code (e.g., Terraform)
• Experience with CI/CD pipelines (e.g., GitHub Actions, TeamCity)
• Knowledge of containerisation and orchestration (Docker, Kubernetes)
• Exposure to serverless architectures
• Experience supporting backend systems for modern frontend frameworks (e.g., React)
• Familiarity with observability and monitoring tools

Soft Skills

• Strong communication skills and ability to collaborate across distributed teams
• Proactive mindset with a strong sense of ownership and accountability
• Ability to prioritise effectively and deliver results under time constraints
• Analytical problem-solving skills with attention to detail
• Customer-focused approach to building reliable and user-centric systems

What We Offer

• Opportunity to work on large-scale, globally distributed systems
• Collaborative and international engineering environment
• Competitive salary and benefits package
• Flexible hybrid working model
• Career growth opportunities and support for continuous learning