How long does the Unseenlabs interview process take?

Most candidates spend between 4 and 8 weeks from recruiter screen to offer. The onsite loop itself runs in a single day or is split across two half-days, with debrief and offer typically within 5 business days after.

How should I prepare specifically for Unseenlabs?

Focus on three things: (1) the company DNA shown above - what they actually grade for, (2) the rounds in your loop, especially the round most candidates underestimate, and (3) drilling on the question types in this guide using a structured framework like CIRCLES or STAR.

Does this apply to engineering or design roles at Unseenlabs?

The DNA stays the same - what changes is the round mix. SWE candidates face coding screens instead of Product Sense; designers face portfolio reviews and design exercises. The "what they value" and behavioral signals carry across all functions.

Other roles at Unseenlabs:Software Engineer Product Manager Supply Chain

Growth · Software Engineer Interview Guide

How to Pass the Unseenlabs Software Engineer Interview in 2026

The Unseenlabs DNA (TL;DR)

Unseenlabs's technical deep-dive rounds emphasize a candidate's capacity to design and implement resilient systems for critical applications like Maritime Surveillance. They specifically grade for the practical application of expertise in developing solutions for Dark Vessels Detection Technology, ensuring precision and reliability in complex space-based data.

The Unseenlabs Interview Loop

Your onsite loop will typically consist of 4 rounds.

1
Round 1
Recruiter Screen
Motivation, role fit, logistics.
2
Round 2
Coding Screen
LeetCode-medium algorithmic problems under time pressure.
3
Round 3
System Design
Distributed systems, trade-offs at scale, architecture under constraints.
4
Round 4
Onsite Coding
LeetCode-hard, debugging, code clarity, edge cases.
5
Round 5
Behavioral / Leadership
Past evidence of ownership, influence, resolving conflict.

The Danger Zone: Top Reasons Candidates Fail

Based on our database of Unseenlabs interview outcomes, avoid these common traps:

Not handling event prioritization or deduplication effectively.
Ignoring the time component in the indexing strategy.
Not considering external factors like signal quality, atmospheric conditions, or sensor calibration.
Underestimating the data volume and processing throughput required.

Test Yourself: Real Unseenlabs Questions

Three real prompts pulled from our database.

Type · ownership

Tell me about a time you encountered a significant technical challenge or bug in a system you were responsible for, and how you took ownership to resolve it, even if it was outside your immediate scope.

Type · debugging

A critical data pipeline that processes satellite imagery for object detection is failing intermittently, producing corrupted output files. The error messages are cryptic and infrequent. Walk me through how you would diagnose and fix this.

Type · algorithm

Imagine you have a large dataset of satellite images, each tagged with a timestamp and a geographic bounding box. You need to find all images that overlap with a given query bounding box and were captured within a specific time range. How would you structure the data and query it efficiently?

+ many more questions, signals, and worked examples

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Unseenlabs Interview Question Bank

A sample from our database, grouped by round. Sign up to see the full set.

9 of 13 questions shown

Recruiter Screen

1
Type · motivation
What specifically about Unseenlabs' mission in space-based maritime surveillance and our use of satellite technology excites you as a software engineer?

Coding Screen

2
Type · algorithm
Given a stream of satellite AIS (Automatic Identification System) messages, each containing ship ID, timestamp, and location, design an algorithm to efficiently detect and flag ships that have been stationary for an unusually long period (e.g., > 24 hours) in a sensitive maritime zone. Assume the stream is high-volume.
3
Type · algorithm
Imagine you have a large dataset of satellite images, each tagged with a timestamp and a geographic bounding box. You need to find all images that overlap with a given query bounding box and were captured within a specific time range. How would you structure the data and query it efficiently?
+ 1 more questions in this round (sign up to unlock)

System Design

4
Type · system-design
Design a system to ingest, process, and serve real-time vessel detection data from a constellation of satellites. Consider data volume, latency requirements, storage, and potential for false positives/negatives.
5
Type · system-design
How would you design a system to alert users (e.g., shipping companies, regulatory bodies) about specific maritime events detected by our satellites, such as vessels entering restricted zones or unusual activity patterns? Consider notification delivery, user preferences, and event prioritization.
+ 1 more questions in this round (sign up to unlock)

Onsite Coding

6
Type · algorithm
Implement a function that takes a list of satellite observation timestamps and their corresponding confidence scores, and returns the most likely time interval during which a specific event occurred, considering that observations can be noisy and incomplete. The function should be robust to missing data points.
7
Type · algorithm
Given a large, unsorted list of vessel positions (latitude, longitude) and timestamps from different satellites, write a function to group these observations by vessel ID and then, for each vessel, find the longest continuous period where its reported position remained within a specified geographical area (e.g., a port or a restricted zone).
+ 1 more questions in this round (sign up to unlock)

Behavioral / Leadership

8
Type · ownership
Tell me about a time you encountered a significant technical challenge or bug in a system you were responsible for, and how you took ownership to resolve it, even if it was outside your immediate scope.
9
Type · collaboration
Describe a situation where you had to collaborate closely with engineers from different teams (e.g., data scientists, hardware engineers) to deliver a complex feature or project related to satellite data analysis. What were the challenges, and how did you ensure effective communication and alignment?
+ 1 more questions in this round (sign up to unlock)