Senior .NET Developer

Career Level: 07 Specialist

Posting Date: 22 Jan 2026

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