.NET Developer

💻 .NET Developer

💰 B2B , salary range flexible

🌍 Hybrid – Warsaw, Puławska 182 (1/2 days from the office)

About N7 Mobile

N7 Mobile is a close-knit, 18-year-strong boutique software house that builds mission-critical systems for some of the biggest financial, payment, and fintech players in Europe.

We’re expanding one of our flagship long-term teams with an experienced .NET engineer who will take real ownership of a brand-new, high-impact backend component – a standalone, long-running service built in .NET 8+ and shipped in Docker, running both in the cloud and directly on customer premises.

Stability, clean architecture, and smooth deployment experience are everything here.

💡 Key Responsibilities

• Design and deliver a rock-solid Background/Worker Service in .NET 8+

• Build a production-ready Dockerized component (cloud + on-premise deployments)

• Keep code quality, testability, and long-term maintainability at the highest level

• Actively drive development with GitHub Copilot, we expect ~50% of the code to be AI-assisted

• Own CI/CD pipelines (GitHub Actions)

• Perform thorough code reviews and continuously raise the team’s engineering bar

• Collaborate daily with the rest of the dev team (English is the working language)

  
  

Requirements

• Deep, production-grade expertise in C# and .NET 8+

• Proven track record shipping long-running services (Worker Service / IHostedService) in Docker

• Strong grasp of background service architecture (channels, resilience, observability, Polly, etc.)

• Fluent with Git + GitHub Actions workflows

• Real daily experience using GitHub Copilot (or similar AI tools) and great prompting skills

• Clean code, SOLID, and modern patterns (DDD/CQRS appreciated) are second nature to you

• Solid spoken and written English (B2+ or higher) – daily technical discussions

• Bonus points: background in financial systems, fiscalization, or POS solutions

  
  

Recruitment process – just 3 short stages

1. Quick HR call (expectations & logistics)

2. Technical interview with the team

3. Project deep-dive call – mostly for you to get to know us and the project inside out

If you enjoy small, senior-heavy teams where decisions are made fast and your opinion truly matters, this is the place.

We’re looking exactly for you. Apply now! 🚀