Application Support Developer (.NET)

Contract: B2B

Location: Remote within Poland

Salary: Up to 120 PLN/h net/B2B

Project: Critical system maintenance and regulatory compliance (REMIT) for energy trading data.

Key Technologies

• .NET Framework

• ASP.NET Core

• C#

• GraphQL

• Kubernetes

• Microsoft Azure

• PostgreSQL

• RabbitMQ

• RESTful API

• TypeScript

• React Jsx

• Hangfire

• System Monitoring

Project Overview

Join our remote team tackling high-stakes technical challenges within the energy sector, focusing on the core diagnostics and engineering maintenance of a critical REMIT-compliant application. This is a specialized role for an Application Support Developer who thrives on deep-dive debugging and mastering a robust, modern stack built on C#/.NET 6/8, PostgreSQL, Azure, and Kubernetes. You will utilize your coding skills to perform complex bug remediation and resolve issues that directly impact European regulatory compliance and commercial operations.

Responsibilities

• Maintain robust application monitoring of critical services to safeguard commercial and regulatory reporting integrity.

• Drive proactive identification and diagnosis of system anomalies using established monitoring frameworks.

• Execute comprehensive bug review and remediation protocols for all issues impacting core system functionality.

• Generate and present bi-weekly reports detailing defect trends and resolutions for stakeholders.

• Manage the resolution pipeline for end-user-reported issues, ensuring prompt action upon bug confirmation.

• Focus exclusively on operational stability and maintenance; new feature development is outside the scope of this role.

• Contribute to potential, separately budgeted product enhancement projects, based on business needs and mutual agreement.

Requirements

• Minimum 4 years of professional experience in Application Support (2nd/3rd line) or as a Software Developer supporting production systems.

• Demonstrable experience with system monitoring and proactive identification of issues using existing monitoring tools.

• Excellent analytical skills for bug review, root cause analysis, and producing clear, accurate reports.

• Strong proficiency with C# (specifically .NET 6 and .NET 8 / ASP.NET Core).

• Experience with data integration protocols: RESTful API and GraphQL.

• Solid experience with PostgreSQL.

• Familiarity with Hangfire or similar job schedulers.

• Working knowledge of React (including JSX) and TypeScript for troubleshooting frontend issues.

• Experience with Microsoft Azure, Kubernetes, and deployment tools.

• Practical experience with monitoring tools (specific tools TBD, but general monitoring expertise is essential).

• Fluency in Polish and an advanced level of English (B2/C1)

Nice to have:

• Experience with or interest in utilizing AI coding/support tools (e.g.,GitHub Copilot, Cursor) to enhance productivity and diagnostics.