Lilium Software Engineer interview questions & guide 2026

Interview questions at Lilium vary significantly depending on the specific team and domain. However, they generally focus on your ability to connect your technical background to the unique challenges of the aviation industry and the Lilium mission.

Motivation and Cultural Alignment

These questions assess your genuine interest in the eVTOL market, your knowledge of Lilium as a company, and how your personal values align with their mission.

• Why do you want to join Lilium?
• What do you know about the eVTOL market and Lilium's position within it?

Preparation for Lilium requires a balanced approach. You must be technically proficient in your core domain while simultaneously demonstrating a deep curiosity for the aerospace industry.

Role-related knowledge – You are expected to be an expert in your specific technical field. Interviewers will test your depth by asking how your previous experience translates to the high-reliability requirements of aviation. Be prepared to discuss your past projects in granular detail.

Systemic thinking – Lilium operates at the intersection of hardware and software. You must demonstrate an ability to understand how your code affects physical systems, including heat dissipation, energy efficiency, and safety-critical constraints.

Values and mission fit – The company values candidates who understand the "why" behind their work. Ensure you have researched their business model, their competitors, and the unique engineering challenges of the Lilium Jet.

The interview process at Lilium is known for being thorough and occasionally lengthy, typically spanning multiple weeks. While it can vary by department, you should generally expect an initial screening with a recruiter, followed by one or more technical assessments—which may include a take-home assignment—and multiple rounds of interviews with hiring managers and team members.

The process is designed to evaluate both your technical "hard" skills and your ability to collaborate within a high-pressure, fast-paced environment. Because the product is safety-critical, the rigor of the technical evaluation can be high, and you should be prepared to defend your technical decisions in detail.

This timeline illustrates the progression from initial contact to final decision. Candidates should use this as a framework to manage their energy, recognizing that the process involves significant time investment. If you are asked to complete a take-home assignment, treat it as a professional deliverable rather than a casual task, as it is a primary evaluation point.

Technical Depth and Rigor

This area assesses your core engineering competencies. Strong performance involves not just providing a working solution, but explaining the trade-offs regarding scalability, safety, and maintainability.

Be ready to go over:

• Code Quality – Ability to write production-grade, testable code.
• Design Decisions – The reasoning behind your choice of architecture or tools.

As a Software Engineer, your day-to-day work centers on moving the Lilium Jet from design to flight. You will likely work in cross-functional squads that include aeronautical engineers, system architects, and test engineers.

• Development and Implementation – Writing, reviewing, and testing software components that meet strict aviation quality standards.
• Collaboration – Participating in design reviews and working closely with hardware teams to ensure software and physical systems are perfectly integrated.
• Problem Resolution – Identifying and fixing technical bottlenecks that could impact the development timeline or vehicle performance.

A competitive candidate for Software Engineer at Lilium typically brings a mix of deep technical expertise and an ability to thrive in a highly regulated, innovative environment.

• Must-have skills – Proficiency in core programming languages relevant to your domain (e.g., C++, Java, or Python), experience with system-level software, and a strong understanding of engineering best practices.
• Nice-to-have skills – Experience in the aerospace or automotive industry, familiarity with safety standards like DO-178, and experience with modeling/simulation tools like Simulink.
• Soft skills – Exceptional communication skills, the ability to work in an international and multilingual team, and a high degree of comfort with ambiguity.

Q: How long does the entire interview process usually take? The process typically lasts between 2 to 6 weeks, though it can extend further depending on team availability and scheduling.

Q: Are the technical take-home tests mandatory? For many technical roles, a take-home assignment is a standard part of the process. It is used to assess your coding standards and architectural thinking before moving to the deep-dive interview rounds.

Q: What is the best way to prepare for the behavioral aspects of the interview? Focus on your motivation for joining Lilium. Be prepared to articulate why you want to work on eVTOL technology specifically, and be ready to discuss how you handle stress and conflict within a team.

Q: Is the work culture at Lilium very corporate? While the company adheres to strict aerospace engineering standards, the environment is often described as that of a fast-paced, mission-driven startup.

• Do your homework – Research Lilium’s founders, their business model, and their current flight testing status. Showing that you have done this research is a common expectation.
• Be prepared for technical deep-dives – If you list a skill on your resume, be prepared to explain it at an expert level.
• Structure your answers – Use the STAR method (Situation, Task, Action, Result) for behavioral questions to keep your responses focused and impactful.
• Ask meaningful questions – Use your interview time to ask about the team structure, the biggest current engineering challenges, and how the team balances innovation with safety.

The Software Engineer position at Lilium is a unique opportunity to shape the future of aviation. Success in this process requires a combination of rigorous technical preparation, a genuine passion for the company's mission, and the ability to articulate your experience in the context of high-stakes engineering.

Focus your preparation on your core technical domain, be ready to discuss your past projects in detail, and ensure you have a clear, compelling reason for wanting to contribute to Lilium. Candidates can explore additional interview insights, practice questions, and preparation resources on Dataford to further sharpen their approach.

The compensation data provided above reflects typical market ranges for this role. Candidates should interpret these figures as a baseline, keeping in mind that total compensation packages may vary based on your level of experience, specific technical expertise, and location.