Prepare for and practice interview questions from Freeform.

Freeform Interview Questions

Freeform Interview Guides

Let’s say we have a table with an <code>id</code> and <code>name</code> fields. The table holds over 100 million rows and we want to sample a random row in the table without throttling the database.

Write a query to randomly sample a row from this table.

Input:

<code>big_table</code> table

<table>
<thead>
<tr>
<th>Columns</th>
<th>Type</th>
</tr>
</thead>

<tbody>
<tr>
<td><code>id</code></td>
<td>INTEGER</td>
</tr>

<tr>
<td><code>name</code></td>
<td>VARCHAR</td>
</tr>
</tbody>
</table>

Write a query to randomly sample a row from a big table.

Random SQL Sample

Let’s say that your company is running a standard control and variant AB test on a feature to increase conversion rates on the landing page. The PM checks the results and finds a .04 p-value.

How would you assess the validity of the result?

Experiment Validity

You are testing hundreds of hypotheses with many t-tests. What considerations should be made?

What is a key disadvantage of the F-test when compared to multiple t-tests?

What is a key disadvantage of the F-test when compared to multiple t-tests?

Hundreds of Hypotheses

You are testing hundreds of hypotheses with many t-tests. What considerations should be made?

Freeform Salaries by Position

SENIOR SOFTWARE ENGINEER (EMBEDDED) Freeform is deploying software-defined, autonomous metal 3D printing factories around the world, bringing the scalability of software to physical production. Our proprietary technology stack leverages advanced sensing, real-time controls, and data-driven learning to produce digitally-verified, flawless parts at unprecedented speed and cost. Our mission is to make the transformative power of 3D printing available to all industries at scale and unlock the future of innovation. As a Senior Embedded Software Engineer at Freeform, you will be responsible for architecting and implementing critical embedded software systems that enable our advanced metal 3D printing factories to operate fully autonomously at high speeds with precision. This entails developing elegant software solutions for hardware control, high speed data acquisition, and custom high performance compute systems. Your software will effectively act as the nervous system of our fully automated metal printing factories. As a crucial member of the engineering team you will be responsible for driving the pace of innovation, maximizing development speed, and maintaining a standard of excellence within the entire engineering team. 3D printing experience is not required to be successful here - rather we look for smart, motivated, collaborative engineers who love solving hard problems and creating amazing technology! Responsibilities: <ul><li>Architect state-of-the-art software for an advanced production-scale metal 3D printing system</li><li>Design and develop the machine instruction interface to the metal 3D printing system hardware</li><li>Develop software to enable the computer vision system, monitor sensor data, perform calibrations, log quality data, and keep track of the health of the printing system over its lifetime</li><li>Work with process and control engineers to integrate control algorithms into production software</li><li>Work with FPGA developers to develop high-speed data acquisition software</li><li>Create software for collection and analysis of process data</li><li>Develop software required to implement production automation solutions</li><li>Develop, unit test, and deploy functional, scalable, robust, and maintainable software</li><li>Generate and maintain documentation of designed software and integrated systems</li></ul> Basic Qualifications: <ul><li>5+ years of experience in software development using C/C++ and/or Rust</li><li>Experience in real-time embedded system design with Linux OS</li><li>Experience in object-oriented programming and design</li></ul> Nice to Have: <ul><li>Bachelor's, Master's or PhD in computer science, applied mathematics, engineering, or related field</li><li>Experience working in a high performance compute environment (FPGAs or GPUs)</li><li>Experience with PCIe driver development and troubleshooting</li><li>Experience with high speed data acquisition and real time closed-loop-control systems</li><li>Excellent knowledge of OS coding techniques, IP protocols, interfaces, and hardware subsystems</li><li>Experience writing software for industrial automation systems, robotics, or related hardware</li><li>Creative thinker able to apply first-principles reasoning to solve complex problems</li><li>Excellent verbal and written communication skills</li></ul> Location: <ul><li>We are located in Hawthorne, CA in a 35,000 square foot, state-of-the-art facility featuring large open spaces for team collaboration, R&D, and production, as well as easy access to the 405, 105, and 110 freeways. Our facility is in the heart of Los Angeles' vibrant emerging tech ecosystem alongside many other high growth startups and enterprises.</li></ul> What We Offer: <ul><li>We have an inclusive and diverse culture that values collaboration, learning, and making deliberate data-driven decisions.</li><li>We offer a unique opportunity to be an early and integral member of a rapidly growing company that is scaling a world-changing technology.</li><li>Benefits<ul><li>Significant stock option packages</li><li>100% employer-paid Medical, Dental, and Vision insurance (premium PPO and HMO options)</li><li>Life insurance</li><li>Traditional and Roth 401(k)</li><li>Relocation assistance provided</li><li>Paid vacation, sick leave, and company holidays</li><li>Generous Paid Parental Leave and extended transition back to work for the birthing parent</li><li>Free daily catered lunch and dinner, and fully stocked kitchenette</li><li>Casual dress, flexible work hours, and regular catered team building events</li></ul></li><li>Compensation <ul><li>As a growing company, the salary range is intentionally wide as we determine the most appropriate package for each individual taking into consideration years of experience, educational background, and unique skills and abilities as demonstrated throughout the interview process. Our intent is to offer a salary that is commensurate for the company's current stage of development and allows the employee to grow and develop within a role. </li><li>In addition to the significant stock option package, the estimated salary range for this role is $140,000-$250,000, inclusive of all levels/seniority within this discipline.</li></ul></li><li>Freeform is an Equal Opportunity Employer that values diversity; employment with Freeform is governed on the basis of merit, competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status. </li></ul>

SENIOR SOFTWARE ENGINEER (C++) Freeform is deploying software-defined, autonomous metal 3D printing factories around the world, bringing the scalability of software to physical production. Our proprietary technology stack leverages advanced sensing, real-time controls, and data-driven learning to produce digitally verified, flawless parts at unprecedented speed and cost. Our mission is to make the transformative power of 3D printing available to all industries at scale and unlock the future of innovation. As a Senior Software Engineer at Freeform, you will be responsible for architecting, developing, and maintaining critical software systems for our autonomous 3D printing factories, which includes controls, data acquisition/storage systems, and input geometry processing pipelines. Ultimately, your solutions will enable the first production scale, high quality, and fully automated metal 3D printing factory capabilities. As a crucial member of the engineering team, you will be responsible for driving the pace of innovation, maximizing development speed, and maintaining a standard of excellence within the entire engineering team. 3D printing experience is not required to be successful here - rather we look for smart, motivated, collaborative engineers who love solving hard problems and creating amazing technology! Responsibilities: <ul><li>Architect and develop software for an advanced, production-scale metal 3D printing system</li><li>Work with process, control, and mechanical engineers to integrate control algorithms into production software</li><li>Improve and scale out high-rate data acquisition, storage, and retrieval systems</li><li>Implement processes for converting customer part geometries into machine print instructions</li><li>Expand testing, continuous integration, and continuous deployment support throughout the software engineering team</li></ul> Basic Qualifications: <ul><li>5+ years of professional experience in software development</li><li>Proficiency in writing production code in C++</li><li>Experience working in a Linux environment</li></ul> Nice to Have: <ul><li>Bachelor's or advanced degree in computer science or computer engineering</li><li>10+ years of professional software development experience</li><li>Experience interfacing with microcontrollers or FPGA computing hardware</li><li>Experience developing embedded or real-time software systems</li><li>Experience writing software for industrial automation systems, robotics, or related hardware</li></ul> Location: <ul><li>We are located in Hawthorne, CA in a 35,000 square foot, state-of-the-art facility featuring large open spaces for team collaboration, R&D, and production, as well as easy access to the 405, 105, and 110 freeways. Our facility is in the heart of Los Angeles' vibrant emerging tech ecosystem alongside many other high growth startups and enterprises.</li></ul> What We Offer: <ul><li>We have an inclusive and diverse culture that values collaboration, learning, and making deliberate data-driven decisions.</li><li>We offer a unique opportunity to be an early and integral member of a rapidly growing company that is scaling world-changing technology. </li><li>Benefits<ul><li>Significant stock option packages</li><li>100% employer-paid Medical, Dental, and Vision insurance (premium PPO and HMO options)</li><li>Life insurance</li><li>Traditional and Roth 401(k)</li><li>Relocation assistance provided</li><li>Paid vacation, sick leave, and company holidays</li><li>Generous Paid Parental Leave and extended transition back to work for the birthing parent</li><li>Free daily catered lunch and dinner, and fully stocked kitchenette</li><li>Casual dress, flexible work hours, and regular catered team building events</li></ul></li><li>Compensation<ul><li>As a growing company, the salary range is intentionally wide as we determine the most appropriate package for each individual taking into consideration years of experience, educational background, and unique skills and abilities as demonstrated throughout the interview process. Our intent is to offer a salary that is commensurate for the company's current stage of development and allows the employee to grow and develop within a role. </li><li>In addition to the significant stock option package, the estimated salary range for this role is $140,000-$250,000, inclusive of all levels/seniority within this discipline.</li></ul></li><li>Freeform is an Equal Opportunity Employer that values diversity; employment with Freeform is governed on the basis of merit, competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status. </li></ul>

SENIOR SOFTWARE ENGINEER (RUST) Freeform is deploying software-defined, autonomous metal 3D printing factories around the world, bringing the scalability of software to physical production. Our proprietary technology stack leverages advanced sensing, real-time controls, and data-driven learning to produce digitally verified, flawless parts at unprecedented speed and cost. Our mission is to make the transformative power of 3D printing available to all industries at scale and unlock the future of innovation. As a Senior Software Engineer at Freeform, you will be responsible for architecting, developing, and maintaining critical software systems for our autonomous 3D printing factories, which includes controls, data acquisition/storage systems, and input geometry processing pipelines. Ultimately, your solutions will enable the first production scale, high quality, and fully automated metal 3D printing factory capabilities. As a crucial member of the engineering team, you will be responsible for driving the pace of innovation, maximizing development speed, and maintaining a standard of excellence within the entire engineering team. 3D printing experience is not required to be successful here - rather we look for smart, motivated, collaborative engineers who love solving hard problems and creating amazing technology! Responsibilities: <ul><li>Architect and develop software for an advanced, production-scale metal 3D printing system</li><li>Work with process, control, and mechanical engineers to integrate control algorithms into production software</li><li>Improve and scale out high-rate data acquisition, storage, and retrieval systems</li><li>Implement processes for converting customer part geometries into machine print instructions</li><li>Expand testing, continuous integration, and continuous deployment support throughout the software engineering team</li></ul> Basic Qualifications: <ul><li>5+ years of professional experience in software development</li><li>Proficiency in writing production code in Rust</li><li>Experience working in a Linux environment</li></ul> Nice to Have: <ul><li>Bachelor's or advanced degree in computer science or computer engineering</li><li>10+ years of professional software development experience</li><li>Experience interfacing with microcontrollers, FPGA, or GPU computing hardware</li><li>Experience developing embedded or real-time software systems</li><li>Experience writing software for industrial automation systems, robotics, or related hardware</li></ul> Location: <ul><li>We are located in Hawthorne, CA in a 35,000 square foot, state-of-the-art facility featuring large open spaces for team collaboration, R&D, and production, as well as easy access to the 405, 105, and 110 freeways. Our facility is in the heart of Los Angeles' vibrant emerging tech ecosystem alongside many other high growth startups and enterprises.</li></ul> What We Offer: <ul><li>We have an inclusive and diverse culture that values collaboration, learning, and making deliberate data-driven decisions.</li><li>We offer a unique opportunity to be an early and integral member of a rapidly growing company that is scaling world-changing technology. </li><li>Benefits<ul><li>Significant stock option packages</li><li>100% employer-paid Medical, Dental, and Vision insurance (premium PPO and HMO options)</li><li>Life insurance</li><li>Traditional and Roth 401(k)</li><li>Relocation assistance provided</li><li>Paid vacation, sick leave, and company holidays</li><li>Generous Paid Parental Leave and extended transition back to work for the birthing parent</li><li>Free daily catered lunch and dinner, and fully stocked kitchenette</li><li>Casual dress, flexible work hours, and regular catered team building events</li></ul></li><li>Compensation<ul><li>As a growing company, the salary range is intentionally wide as we determine the most appropriate package for each individual taking into consideration years of experience, educational background, and unique skills and abilities as demonstrated throughout the interview process. Our intent is to offer a salary that is commensurate for the company's current stage of development and allows the employee to grow and develop within a role. </li><li>In addition to the significant stock option package, the estimated salary range for this role is $140,000-$250,000, inclusive of all levels/seniority within this discipline.</li></ul></li><li>Freeform is an Equal Opportunity Employer that values diversity; employment with Freeform is governed on the basis of merit, competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status. </li></ul>

SOFTWARE ENGINEER (EMBEDDED) Freeform is deploying software-defined, autonomous metal 3D printing factories around the world, bringing the scalability of software to physical production. Our proprietary technology stack leverages advanced sensing, real-time controls, and data-driven learning to produce digitally-verified, flawless parts at unprecedented speed and cost. Our mission is to make the transformative power of 3D printing available to all industries at scale and unlock the future of innovation. As a Senior Embedded Software Engineer at Freeform, you will be responsible for architecting and implementing critical embedded software systems that enable our advanced metal 3D printing factories to operate fully autonomously at high speeds with precision. This entails developing elegant software solutions for hardware control, high speed data acquisition, and custom high performance compute systems. Your software will effectively act as the nervous system of our fully automated metal printing factories. As a crucial member of the engineering team you will be responsible for driving the pace of innovation, maximizing development speed, and maintaining a standard of excellence within the entire engineering team. 3D printing experience is not required to be successful here - rather we look for smart, motivated, collaborative engineers who love solving hard problems and creating amazing technology! Responsibilities: <ul><li>Contribute to the architecture state-of-the art software for an advanced production-scale metal 3D printing system</li><li>Design and develop the machine instruction interface to the metal 3D printing system hardware</li><li>Develop software to enable the computer vision system, monitor sensor data, perform calibrations, log quality data, and keep track of the health of the printing system over its lifetime</li><li>Work with process and control engineers to integrate control algorithms into production software</li><li>Work with FPGA developers to develop high-speed data acquisition software</li><li>Create software for collection and analysis of process data</li><li>Develop software required to implement production automation solutions</li><li>Develop, unit test, and deploy functional, scalable, robust, and maintainable software</li><li>Generate and maintain documentation of designed software and integrated systems</li><li>Integrate third-party software packages into proprietary software</li></ul> Basic Qualifications: <ul><li>2+ years of experience in software development using C/C++ and/or Rust with a Bachelor's degree in computer science, computer engineering, or electrical engineering, or 4+ years of professional software experience without a degree</li><li>Experience in real-time embedded system design with Linux OS</li><li>Experience in object-oriented programming and design</li></ul> Nice to Have: <ul><li>3+ years of experience in embedded software development</li><li>Master's in computer science, applied mathematics, engineering, or related field</li><li>Experience working in a high performance compute environment (FPGAs or GPUs)</li><li>Experience with high speed data acquisition and real time closed-loop-control systems</li><li>Excellent knowledge of OS coding techniques, IP protocols, interfaces, and hardware subsystems</li><li>Experience writing software for industrial automation systems, robotics, or related hardware</li><li>Creative thinker able to apply first-principles reasoning to solve complex problems</li><li>Excellent verbal and written communication skills</li></ul> Location: <ul><li>We are located in Hawthorne, CA in a 35,000 square foot, state-of-the-art facility featuring large open spaces for team collaboration, R&D, and production, as well as easy access to the 405, 105, and 110 freeways. Our facility is in the heart of Los Angeles' vibrant emerging tech ecosystem alongside many other high growth startups and enterprises.</li></ul> What We Offer: <ul><li>We have an inclusive and diverse culture that values collaboration, learning, and making deliberate data-driven decisions.</li><li>We offer a unique opportunity to be an early and integral member of a rapidly growing company that is scaling a world-changing technology.</li><li>Benefits<ul><li>Significant stock option packages</li><li>100% employer-paid Medical, Dental, and Vision insurance (premium PPO and HMO options)</li><li>Life insurance</li><li>Traditional and Roth 401(k)</li><li>Relocation assistance provided</li><li>Paid vacation, sick leave, and company holidays</li><li>Generous Paid Parental Leave and extended transition back to work for the birthing parent</li><li>Free daily catered lunch and dinner, and fully stocked kitchenette</li><li>Casual dress, flexible work hours, and regular catered team building events</li></ul></li><li>Compensation <ul><li>As a growing company, the salary range is intentionally wide as we determine the most appropriate package for each individual taking into consideration years of experience, educational background, and unique skills and abilities as demonstrated throughout the interview process. Our intent is to offer a salary that is commensurate for the company's current stage of development and allows the employee to grow and develop within a role. </li><li>In addition to the significant stock option package, the estimated salary range for this role is $100,000-$145,000, inclusive of all levels/seniority within this discipline.</li></ul></li><li>Freeform is an Equal Opportunity Employer that values diversity; employment with Freeform is governed on the basis of merit, competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status. </li></ul>

Freeform Interview Questions

Freeform Interview Guides

Freeform Interview Questions

Freeform Salaries by Position

Freeform Opening Jobs