Senior Product Software Engineer (Full Stack) (m/w/d)

We are looking for you as

Senior Product Software Engineer (Full Stack) (m/w/d)
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limited
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in Cologne
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Interzero is one of the leading service providers in closing product, material, and logistics cycles and a pioneer in plastics recycling, operating Europe’s largest sorting capacity. Guided by the principle of “zero waste solutions,” the company supports more than 80,000 customers across Europe in the responsible handling of recyclable materials, helping them improve their sustainability performance and conserve primary resources. With around 2,000 employees, Interzero generates annual revenues of nearly one billion euros. According to Fraunhofer UMSICHT, Interzero’s recycling activities alone saved approximately 1\.04 million tons of greenhouse gas emissions and 8\.09 million tons of primary raw materials compared to primary production in 2024\. Further information at: www.interzero.de.

Cologne
Fulltime

Asap

What is it about?

• Software Solutions: You develop and implement customized software solutions using ASP, .NET, and Razor, including analyzing requirements, designing robust architectures, writing clean code, performing unit and integration testing, and ensuring scalability, security, and maintainability while collaborating closely with product and UX teams and documenting your work clearly.


• Server Systems Administration: You manage and administer server systems, handling installation, configuration, monitoring, and performance tuning while ensuring availability, stability, and security, managing user access, implementing disaster recovery measures, and proactively identifying and resolving bottlenecks.


• Process Monitoring: You oversee and administer processing workflows, feeds, and pipelines, identify deviations, debug issues, apply corrective actions, and ensure reliable and timely execution while documenting processes and communicating disruptions clearly to the team.


• Server Maintenance: You maintain server systems (Windows/SQL/FTP/Email/IIS), perform updates, patch and release management, minimize downtime, optimize database performance, ensure strong security configurations and backup strategies, and handle incidents and escalations efficiently.


• Microservices Development: You design and build microservices architectures with well\-defined APIs, ensure loose coupling, test coverage, and observability, and work closely with frontend, DevOps, and security teams to deliver scalable, maintainable services while continuously improving and documenting them.

Advantages:

• Job Security: You can expect a varied, exciting, and secure role with one of the largest environmental service providers in a future\-proof industry.


• Compensation: You receive performance\-based pay with a strong focus on maintaining your work\-life balance.


• Flexibility: You benefit from flexible working hours and the option to work remotely.


• Creative Freedom: You work in an environment where ideas, initiative, and creative freedom are encouraged and supported.


• Flat Hierarchies: You operate within flat hierarchies and quickly take on responsibility for your own tasks.


• Collaboration: You experience a culture of collaboration and respect at eye level, both within and beyond your team.


• Development: You have access to internal and external training and development opportunities.


• Health: You benefit from a comprehensive health management program.


• Benefits: You receive attractive perks such as corporate benefits, bike leasing, free drinks and fruit on\-site, and coverage of the Germany ticket or an Edenred card.

Profile:

• Education: You have completed training in computer science, IT systems electronics, or a comparable IT\-related qualification.


• Technical Skills: You have solid experience with Microsoft .NET environments (e.g., C\#, ASP.NET, ASP.NET Core, Razor Pages) as well as strong SQL knowledge (preferably SQL Server), including database design, query optimization, and performance tuning.


• Working Style: You demonstrate strong analytical and logical thinking skills, use structured approaches to understand complex requirements, and translate them into practical, efficient solutions while working in an organized and prioritized manner.


• Communication: You have good German and English language skills and strong communication abilities.


• Personal Skills: You bring strong problem\-solving skills and work collaboratively within a team; you are reliable, detail\-oriented, flexible, and able to stay composed under pressure while showing a willingness to learn and continuously develop.

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