Senior .Net Engineer

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

Benefits offered by this job

Flexible hybrid model

Job summary

EasySoftGroup seeks a Senior Backend Software Engineer to design, build, and scale cloud-native backends for its SaaS platform. You will influence architecture, optimize performance, and deliver robust services for high-traffic applications.

You will work with frontend teams, product management, and distributed teams in an agile environment to create scalable solutions and maintain top quality code.

Qualifications

• 5+ years in backend software engineering for web or SaaS.
• Strong C#, .NET, ASP.NET Core proficiency and API design.
• Experience with distributed systems and cloud-native architectures.
• Hands-on AWS experience and event-driven design.
• Relational DBs (SQL Server) and ORM (EF).

Responsibilities

• Design, build, and scale cloud-native backend services.
• Develop RESTful APIs and microservices with a focus on performance.
• Collaborate across teams to translate requirements into architecture.
• Lead architecture discussions, code reviews, and CI/CD practices.
• Ensure security, reliability, and observability of systems.

Skills

5+ years backend experience

C#, .NET, ASP.NET Core

RESTful APIs

Event-driven architecture

Tools

AWS

SQL Server

Entity Framework

Terraform

Docker

Kubernetes

GitHub Actions

TeamCity

Elasticsearch

API Gateway

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