Astrome Technologies Systems Engineer Interview: Rounds, Questions and Preparation

What the job involves

A Systems Engineer in space and defence tech designs and integrates subsystems such as payloads, communication modules, power systems, and onboard computers for satellites or defence platforms. The role involves requirements analysis, hardware-software integration, testing, and validation, often working in small cross-functional teams where you own a subsystem end to end. Day to day you might write interface control documents, run bench tests, debug anomalies, and support environmental qualification campaigns.

Role and Domain Knowledge

1. 1

   Walk me through the major subsystems of a small satellite and explain how they interact.

   Cover payload, power, attitude determination and control, communication, onboard computer, and thermal. Explain data and power flow between them and mention constraints like mass and power budget.

2. 2

   What is a link budget and why is it critical for a satellite communication system?

   Explain the terms: transmit power, antenna gain, path loss, noise figure, and required Eb/N0. Show how you balance these to close the link and mention margin for atmospheric and pointing losses.

3. 3

   How does the space environment affect electronic components and what mitigation methods do you know?

   Mention radiation effects like single event upsets and total ionizing dose, thermal cycling, and vacuum. Discuss shielding, radiation-hardened parts, watchdog timers, and derating.

4. 4

   Explain the V-model of systems engineering and how it applies to a satellite project.

   Describe left-side requirements decomposition and right-side integration and verification. Give an example like a power board going from requirements to unit test, subsystem test, and satellite-level test.

Technical Fundamentals

1. 5

   Design a simple circuit to regulate a 12V battery down to 5V for an onboard computer. What converter topology would you choose and why?

   Compare linear regulator and buck converter for efficiency. Discuss dropout, heat dissipation, switching frequency, and protection features like overcurrent and reverse polarity.

2. 6

   Write a C function to debounce a push button input on a microcontroller.

   Show a state machine or timer-based approach with a defined debounce period. Mention interrupt versus polling and explain how you avoid blocking the main loop.

3. 7

   What is the difference between I2C, SPI, and UART? Which would you use for a sensor on a satellite and why?

   Compare speed, number of wires, addressing, and error handling. Recommend based on sensor data rate, distance, and noise immunity, and mention redundancy or bus isolation.

4. 8

   A telemetry packet is arriving corrupted at the ground station. How would you debug this systematically?

   Start from physical layer: check antenna, cable, and signal strength. Then check protocol layer: framing, checksum, and packet parsing. Suggest adding error counters and loopback tests.

Practical Scenarios and Problem Solving

1. 9

   During a thermal vacuum test, your subsystem resets intermittently. How do you approach finding the root cause?

   Outline a plan: reproduce the failure, log temperature and voltage, check for cold solder joints or component tolerance drift, and isolate by swapping boards. Mention reviewing derating and thermal analysis.

2. 10

   You need to reduce the mass of your communication module by 20 percent without losing performance. What levers do you have?

   Discuss material selection, PCB stackup, component placement, and antenna design. Mention trade-offs with thermal and structural margins and the need for re-qualification.

3. 11

   Your team has two weeks to deliver a prototype for a defence communication system. How do you prioritize tasks?

   Focus on minimum viable functionality, identify critical path items, and defer non-essential features. Talk about daily stand-ups, risk register, and early integration to catch issues.

4. 12

   How would you test a star tracker or sun sensor before it goes on the satellite?

   Describe a test setup with a sun simulator or star field projector, calibration procedures, and accuracy measurement. Mention environmental tests like vibration and thermal cycling.

Behavioural and HR Questions

1. 13

   Why do you want to work in space and defence tech, and why a smaller or fast-growing company?

   Show genuine interest in the sector and its impact. Mention the opportunity to wear multiple hats, learn quickly, and see your work fly. Avoid generic answers about 'passion for technology'.

2. 14

   Tell me about a time you worked in a team to solve a technical problem. What was your role?

   Use STAR format. Highlight your specific contribution, how you communicated, and the outcome. Emphasize collaboration and any conflict resolution.

3. 15

   Describe a project where you had to learn something new quickly. How did you manage?

   Pick a concrete example like learning a new tool or programming language. Explain your learning method, resources used, and how you applied it to deliver results.

4. 16

   Where do you see yourself in three years, and how does this role fit your goals?

   Align your growth with the company's needs: becoming a go-to person for a subsystem, taking on more design ownership, or mentoring juniors. Show commitment to the sector.