Successful preparation for a Software Engineer role at Relativity Space requires a balanced approach. You must be ready to demonstrate both computer science rigor and an understanding of physical engineering constraints.

Role-Related Knowledge – You must show deep proficiency in your core programming languages (typically C++ or Python) and system design. Additionally, be prepared to demonstrate a strong grasp of how software interacts with hardware, including operating system concepts, real-time constraints, and network protocols.

Problem-Solving under Constraints – Interviewers look at how you handle ambiguity. When presented with a vague software or physical scenario, you should proactively ask clarifying questions, state your assumptions clearly, and systematically define your constraints before writing code or proposing an architecture.

Technical Communication – A major component of the process is your ability to present your past work. You must be able to articulate your personal contributions to complex projects, explain the rationale behind your design decisions, and defend your technical choices to a panel of multi-disciplinary engineers.

Cultural and Mission Alignment – Relativity Space values engineers who are passionate about space exploration and manufacturing innovation. Show that you are highly collaborative, resilient in the face of changing requirements, and comfortable working with physical systems where safety and reliability are paramount.

The interview process at Relativity Space is thorough and designed to evaluate your technical capabilities, problem-solving methodologies, and cultural alignment over several stages. Candidates can expect a structured journey that transitions from high-level conversations to deep-dive technical assessments.

The process typically begins with a recruiter phone screen to assess basic fit, verify citizenship requirements (which may apply to specific security-sensitive roles), and discuss your career goals. This is followed by one or two technical phone screens or video calls. These initial technical rounds focus on coding challenges, system design discussions, and fundamental engineering concepts related to the specific team you are interviewing for.

The final stage is a rigorous onsite (or virtual onsite) interview. This stage is highly comprehensive, often lasting several hours, and is designed to simulate a real day of work at Relativity Space. It typically includes a technical portfolio presentation where you present a past project to a panel of engineers, followed by sequential 1:1 sessions focusing on coding, system architecture, and behavioral scenarios.

The timeline above represents the typical progression for a Software Engineer candidate. The process begins with initial alignment screens, moves into deep-dive technical evaluations, and culminates in a multi-hour onsite loop. Use this timeline to pace your study plan, ensuring you allocate ample time to prepare your technical presentation prior to the final round.

To excel in the Relativity Space interview process, you must understand the specific competencies being evaluated in each core area. The company's engineering team looks for candidates who can bridge the gap between software theory and physical application.

Software Design and Coding

The coding rounds at Relativity Space are practical rather than purely academic. While you will face questions testing your knowledge of data structures and algorithms, these problems are often framed around real-world scenarios you would encounter when writing software for rockets or manufacturing equipment.

Be ready to go over:

• Data Structure Optimization – Knowing when to use hash maps, queues, trees, or custom structures to optimize for time and memory.
• Concurrency and Multithreading – Managing shared resources, avoiding deadlocks, and ensuring thread safety in control software.
• Low-Level Concepts – Understanding memory management, pointer manipulation, and operating system scheduling, especially if you are interviewing for embedded or vehicle software teams.
• Advanced concepts (less common) – Real-time operating systems (RTOS), ROS2 frameworks, and hardware interrupt handling.

Example scenarios:

• "Design a thread-safe circular buffer for logging high-frequency sensor data without blocking the main execution loop."
• "Write an algorithm to detect state transitions in a valve controller based on a series of incoming pressure readings."

Technical Portfolio Presentation

One of the most distinctive aspects of the Relativity Space onsite interview is the technical portfolio presentation. You will be asked to prepare a slide deck (typically 30 to 45 minutes) detailing a complex technical project you have previously driven.

Be ready to go over:

• Project Architecture – Clearly explaining the overall system design and why specific technologies or patterns were chosen.
• Personal Contributions – Explicitly defining what you designed, wrote, and tested, rather than just talking about the team's collective output.
• Engineering Trade-offs – Discussing the constraints you faced (such as time, budget, hardware limitations, or performance) and how you navigated them.
• IP and NDA Compliance – Ensuring that your presentation does not contain proprietary information from previous employers, as respect for intellectual property is highly scrutinized.

Example scenarios:

• "Present a high-reliability software system you designed, detailing how you verified its performance under simulated stress conditions."
• "Walk us through a system failure you encountered in production, how you diagnosed the root cause, and the software architectural changes you implemented to prevent it."

Multi-Disciplinary Engineering Fundamentals

Because the software you write will interact with physical systems, Relativity Space expects its software engineers to have a foundational understanding of physical sciences. You do not need to be an aerospace engineer, but you must be able to communicate effectively with them.

Be ready to go over:

• Thermodynamics and Fluids – Basic principles of heat transfer, fluid flow, and pressure management.
• Statics and Mechanics – Understanding forces, stress-strain relationships, and material properties.
• System Feedback Loops – How control software reads sensor inputs (like pressure, temperature, or position) and commands actuators (like valves, motors, or heaters) to maintain system stability.
• Advanced concepts (less common) – Finite Element Analysis (FEA) concepts, closed-loop PID control tuning, and signal processing.

Example scenarios:

• "Explain how you would write a software control loop to safely pressurize a vessel, accounting for sensor noise and potential valve delays."
• "Describe the physical principles you would need to model in software to simulate a thermal cooling system on a test stand."

As a Software Engineer at Relativity Space, your day-to-day work will vary depending on your specific team (e.g., Vehicle Software, Additive Manufacturing Software, Launch Control, or Infrastructure), but core responsibilities generally include:

• Developing Control and Automation Software – Writing robust, low-latency code to control robotic 3D printers, manage propellant flow on test stands, or guide flight vehicles.
• Designing High-Throughput Data Pipelines – Building systems capable of ingesting, processing, and visualizing massive streams of telemetry and sensor data from manufacturing floors and launch sites.
• Collaborating with Hardware Teams – Partnering closely with materials scientists, mechanical engineers, and integration specialists to translate physical requirements into reliable software specifications.
• Implementing HIL and Simulation Frameworks – Creating simulated environments to thoroughly test software changes against hardware models before deploying to physical systems.
• Supporting Test and Launch Operations – Participating in active testing campaigns and launch operations, which may include troubleshooting software issues in real-time on-site or at test facilities.