Senior .NET Backend Engineer — Microservices & Cloud Scale

Growe Talents group; Reims; On-site; EUR 70,000 - 90,000; Full time

Job summary

Growe is seeking a senior backend developer to design, build, and maintain scalable services using C# and .NET 6+. You will work with microservices, authentication, and data storage in PostgreSQL, ensuring performance and reliability in production.

You’ll collaborate across DevOps for Kubernetes deployments, GitOps workflows, and observability with logs and dashboards, while participating in on-call rotations and code reviews to drive quality.

Qualifications

• 5+ years of commercial backend development experience with C# / .NET (6+), .NET Core / ASP.NET Core.
• Solid understanding of microservices architecture and distributed systems.
• Experience with asynchronous communication and event-driven architectures.
• Experience with message brokers (Kafka or similar).
• Strong knowledge of relational databases (SQL, transactions, indexing, performance tuning), PostgreSQL will be a plus.
• Experience with ORM tools (e.g., Entity Framework).
• Experience writing Unit and Integration tests.
• Understanding of authentication and authorization (OAuth 2.0, OpenID Connect).
• Good understanding of software design principles (SOLID, separation of concerns, testability).
• Understanding of observability and monitoring in production systems.
• Experience troubleshooting performance and memory issues.
• English - Upper Intermediate.
• Experience with AWS, Kubernetes, Terraform will be a plus.
• Experience with Grafana, Loki, Tempo will be a plus.

Responsibilities

• Design, build, and maintain backend services using .NET (C#).
• Develop and evolve microservices in a production environment.
• Support existing functionality and ensure backward compatibility of releases.
• Work on core domain flows such as accounts, registration, authentication, wallet, and related business capabilities.
• Participate in task analysis, decomposition, and effort estimation.
• Deliver completed tasks for testing and collaborate with QA during test phases.
• Build integrations using asynchronous communication and event-driven patterns.
• Work with relational databases, transactional flows, and optimize query performance.
• Identify performance bottlenecks and contribute to system design improvements.
• Contribute to service observability (logs, metrics, traces, dashboards, monitoring).
• Manage deployment configurations and manifests in Kubernetes environments.
• Work in a GitOps setup and participate in deployment and operational ownership.
• Collaborate with DevOps teams on infrastructure-related changes (including Terraform workflows).
• Participate in on-call rotation and handle production incidents.
• Identify technical debt and propose improvements.
• Perform high-quality code reviews focusing on maintainability, performance, and consistency.

Skills

C# / .NET

Microservices

Async messaging

Kafka

PostgreSQL

Entity Framework

Unit tests

OAuth 2.0

OpenID Connect

SOLID design

Observability

Performance tuning

AWS

Kubernetes

Terraform

Grafana

Loki

Tempo

English

Tools

Kafka

PostgreSQL

Entity Framework

AWS

Kubernetes

Terraform

Grafana

Loki

Tempo

Job description

Growe is seeking a senior backend developer to design, build, and maintain scalable services using C# and .NET 6+. You will work with microservices, authentication, and data storage in PostgreSQL, ensuring performance and reliability in production.

You’ll collaborate across DevOps for Kubernetes deployments, GitOps workflows, and observability with logs and dashboards, while participating in on-call rotations and code reviews to drive quality.