Senior Backend Engineer (all genders) - Sofia onsite

Challenge the impossible - are you ready? Join AIXTRON and shape the future!

At AIXTRON, a leading supplier of deposition systems to the semiconductor industry, it’s not just about creating technology - it's about shaping the future. Ever since the company was established in 1983, we have been driven and defined by our spirit of discovery and our passion for excellence. Our state-of-the-art systems are at the heart of many high-tech applications, from LED and display technology to energy management, communication, and much more besides. All of this is made possible by a team brimming with talent - our greatest asset. Drawing on your skills and your enthusiasm for technology, you too could soon be contributing to our efforts, as we endeavor to push the boundaries of what is possible. At AIXTRON, you can look forward to exciting projects, interdisciplinary teams, and the opportunity to be at the forefront of technological advancement.

Your Challenge

• As an experienced backend developer, you will work closely with your agile team to tackle technical and conceptual challenges, collaboratively developing suitable solutions and ideas for our current and future plant software and its surrounding components.
• You will coordinate with stakeholders, partners, process engineers, and other colleagues regarding requirements and acceptance criteria, while ensuring our high quality standards through unit testing, simulation testing, and direct system testing. You will share your knowledge within the team and always maintain an overview of the overall architecture.
• Among other responsibilities, you will ensure the timely completion of all assigned tasks.
• Through appropriate software concepts, implementation, testing, and documentation - while considering applicable national and international standards - you will help guarantee the demanding AIXTRON quality standard.

What You Bring

• You hold a degree in an IT-related field or a completed vocational training qualification, along with at least 5-10 years of professional experience as a software engineer in complex software projects.
• As a backend developer, you have knowledge in C#, .NET 8+, strong OOP, SOLID principles, design patterns, Microservices architecture, Event-driven architecture, API design (REST, gRPC, GraphQL), Clean Architecture.
• Experience with relational databases (SQL Server, PostgreSQL), including database design, ORM usage (e.g., Entity Framework Core), and query optimization.
• Experience with Windows host and Linux systems, virtual machines, and containerization, as well as knowledge of additional object-oriented programming languages, web development, and software architecture design/documentation techniques, would be an advantage.
• Interest in AI-assisted dev tooling.
• You enjoy working in an agile team environment and are self-driven, structured, and responsible.
• You are always willing to familiarize yourself with new topics, contribute ideas, and stay informed about new developments and trends in IT.
• Strong communication skills in English, and ideally in German.
• Willingness to live in or near Sofia and join our office team 2-3 days per week.

What you can expect from us

• Flexible working time (8 hrs per day): Design your schedule without fixed core hours, work remotely, and switch between office and mobile work.
• Vacation: You receive 25 vacation days
• Development: Continuous learning is important to us - whether through our AIXTRON Academy or individual development programs.
• Open company culture: We maintain an open and respectful “first-name” culture across all hierarchy levels.
• Social benefits: We offer various social benefits
• Modern Company Site: Highly modern office with access to a private canteen and Gym