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# Senior .NET Engineer

- **Company:** Springtime Technologies GmbH
- **Location:** Wien, Austria
- **Experience:** Expert
- **Salary:** €55,356.0
- **Contract:** Permanent contract
- **Skills:** ASP.NET, .NET Framework, Multitier Architecture, Microsoft Windows, Wireless LAN, Active Directory, Application Programming Interfaces (APIs), Artificial Intelligence, Confluence, JIRA, Microsoft Azure, C Sharp (Programming Language), Software as a Service, Cloud Computing, Code Review, Relational Databases, DevOps, Distributed Systems, Elasticsearch, Entity Framework, Virtual Private Networks (VPN), Microsoft SQL Server, Windows Servers, Nunit, Microsoft SharePoint, Software Engineering, Systems Integration, TCP/IP, TypeScript, Virtual Local Area Networks, Tailwind, GitHub Copilot, ReactJS, Claude Code, Firewalls (Computer Science), AI Coding Agents, Backend, Agentic-AI, AngularJS, Integration Tests, Kubernetes, Atlassian Tools, Apache Kafka, Front End Software Development, React Redux, Claude, Restful APIs, Domain Driven Design, Code Restructuring, Api Management, Docker, Legacy Systems
- **Published:** October 30, 2026
- **Apply:** https://go-springtime.onlyfy.jobs/en/job/b28xzwd999l2823no3zb6xurd4o2f87

## About the Role

* You are also comfortable working with legacy systems on .NET Framework 4.8.
 * An AI-first way of working.
 * You use AI tools such as GitHub Copilot and Claude as your default in daily development, not occasionally.
 * You work well with engineers, product managers and DevOps, and you make the people around you better.
 * You are at home in Jira and Confluence.
 * You want to make a difference, take ownership and hold yourself to a high standard.
 * A track record of setting standards or leading technical decisions is a strong plus, and essential for one of the two roles.
 * Excellent English, written and spoken.

Erfahrung

 * Senior .NET experience.
 * 5+ years building production back-end systems in C#, ASP.NET and Entity Framework, including .NET 10, with strong fundamentals in performance and a real affinity for good code design, refactoring and testability.
 * Strong experience designing RESTful APIs and distributed systems, working with Elasticsearch, Kafka, Docker, Kubernetes and various Azure services, and building on relational databases such as SQL Server.
 * Hands-on experience with React and TypeScript, including state management libraries and integrating front ends with back-end APIs.
 * Experience with xUnit or NUnit and integration testing, and a working understanding of CI/CD pipelines.
 * Experience with SaaS platforms is a plus, though not required.

## Description

In dieser Position entwickelst du die Invoicetrack-Plattform, designst und implementierst Back-End-Services sowie Front-End-Schnittstellen und führst technische Standards in einem agilen Team ein.
Job-Zusammenfassung

Job-Technologien

 * Apache Kafka
 * Entity Framework
 * JIRA
 * NUnit
 * Elasticsearch
 * RESTful API
 * SQL Server
 * React
 * Azure
 * Confluence
 * .NET
 * TypeScript
 * Kubernetes
 * ASP.NET
 * xUnit
 * Docker
 * C#

Deine Rolle im Team

 * We are growing our .NET engineering team and are in a search of senior full-stack engineers.
 * The team builds the Invoicetrack platform, from the back-end services to the interfaces customers work in, in close collaboration with product management.
 * You are a senior engineer with real ownership.
 * You design, build and run what you ship, and you help shape how the team works.
 * One of these roles carries stronger technical leadership: setting standards, guiding design decisions and raising the quality of the whole team.
 * Work with AI agents daily.
 * Tools such as Claude Code and GitHub Copilot are your default way of working, and you know what to delegate and when to take the wheel.
 * Own what AI produces.
 * You give agents clear context and review their output critically, accountable for its correctness and security.
 * Writes AI ready specs with testable acceptance criteria before any code is written.
 * Hands whole tasks to AI coding agents and checks the output against the spec.
 * Has the agent write tests first; nothing merges until CI and coverage checks pass.
 * Reviews by outcome, not line by line, and improves the team's shared skills and conventions.
 * Raise the team's game.
 * Share prompts, tools, skills and workflows that work.
 * In the technical leadership role, set the standards for how the team works with AI.
 * Ship software finance teams rely on.
 * Build across the stack.
 * Design and deliver features end to end, from .NET 10 services and RESTful APIs to React front ends, and agree clear API contracts with the front-end engineers you build them with.
 * Shape the architecture.
 * Lead back-end architecture and data modelling decisions on SQL Server, applying clean architecture and domain-driven design so the platform stays scalable, fast and maintainable.
 * Set the quality bar.
 * Establish coding standards and best practices through code review, design discussion and example, and give feedback that helps other engineers improve.
 * Work with product.
 * Turn product problems into technical solutions with the product manager, and push back when there is a simpler or better way.
 * Run what you build.
 * Work with DevOps on CI/CD pipelines, Docker and Kubernetes deployments and monitoring, and keep improving the performance, security and scalability of services in production for enterprise customers.
 * Grow the team.
 * Share knowledge, support other engineers and help hire the people who join after you., + Onsite
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Wir sind ein modernes IT-Dienstleistungsunternehmen und betreuen Firmenkunden in allen Bereichen der IT-Infrastruktur - von Arbeitsplatzsystemen über Server, Netzwerke, Firewalls bis hin zu Cloud-Lösungen. Zur Erweiterung unseres Teams suchen wir 1...

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