Fintech .NET Backend Engineer — Microservices on AWS

0TO9 | Bank of Entrepreneurship; Wrocław; On-site; PLN 180,000 - 270,000; Full time

Job summary

0TO9 | Bank of Entrepreneurship is seeking a backend software engineer to build scalable microservices in C#/.NET on AWS ECS. You will craft systems that enable fintech ventures to scale, with a focus on reliability, performance, and clean code.

Collaborate with product managers, architects, and engineers to deliver high‑quality APIs, apply DDD and CQRS, and design event‑driven communication using NATS. Frontend is optional but available for end-to-end ownership.

Qualifications

• Backend experience with microservices and distributed systems.

Responsibilities

• Build and maintain C#/.NET microservices on AWS ECS.

Skills

Backend microservices

C# and .NET

AWS

DDD and CQRS

Event-driven architectures (NATS)

Observability and monitoring

CI/CD

LLMs and agentic tools

Tools

AWS ECS

MS SQL Server

DynamoDB

S3

IAM

NATS

CloudWatch/Datadog

Job description

0TO9 | Bank of Entrepreneurship is seeking a backend software engineer to build scalable microservices in C#/.NET on AWS ECS. You will craft systems that enable fintech ventures to scale, with a focus on reliability, performance, and clean code.

Collaborate with product managers, architects, and engineers to deliver high‑quality APIs, apply DDD and CQRS, and design event‑driven communication using NATS. Frontend is optional but available for end-to-end ownership.