Senior .NET Developer

Senior .NET Developer

Location: Krakow 

Employment: Full-time

About the Role

ClearAccept is a modern payments business building a cloud-native platform on AWS. As we scale our engineering teams, we’re looking for a Senior .NET Developer to help design and deliver secure, scalable services in a high-availability environment.

You’ll work in a cross-functional team alongside Product, Architecture, DevOps, and QA to build API-first, event-driven solutions using modern .NET and AWS services.

What You’ll Do

• Design and build backend services using C# and .NET (latest LTS)

• Develop REST APIs / Minimal APIs in a microservices environment

• Work with event-driven and asynchronous architectures

• Collaborate on solution design, story estimation, and delivery

• Apply DDD, TDD/BDD, and clean coding practices

• Review code, improve existing services, and mentor other developers

• Contribute to continuous improvement of engineering standards and processes

Tech Stack (key highlights)

• Languages: C#, .NET, TypeScript

• Cloud: AWS (ECS/Fargate, API Gateway, SQS/SNS, Lambda, Cognito)

• Databases: PostgreSQL (Aurora), DynamoDB, Redis

• Architecture: Microservices, Event-driven, API-first

• Messaging & Patterns: MassTransit, MediatR, DDD, CQRS

• CI/CD: Git, automated pipelines, Infrastructure as Code (Terraform)

What We’re Looking For

• 5+ years’ experience as a software developer

• Strong experience with C# and .NET

• Solid background in Web API development

• Experience with SQL and NoSQL databases

• Understanding of distributed systems and asynchronous programming

• Experience with CI/CD and secure coding practices

• Strong communication skills and a collaborative mindset

Nice to Have

• Payments or financial services experience

• PCI DSS exposure

• Hands-on CQRS experience

Why Join Us

• Modern tech stack and cloud-native architecture

• Real influence on technical decisions

• Collaborative, experienced engineering team

• Opportunity to grow with a scaling payments platform