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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?

Suppose there exists a new airline named Jetco that flies domestically across North America. Jetco recently had a study commissioned that tested the boarding time of every airline, and it came out that Jetco had the fastest average boarding times of any airline.

What factors could have biased this result, and what would you look into?

What could potentially bias the average boarding time in favor of an airline that only flies domestically?

What could potentially bias the average boarding time in favor of an airline that only flies domestically?

Boarding Times Bias

A new airline came out as the fastest average boarding times compared to other airlines.  What factors could have biased this result and what would you look into?

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Senior Ground Software EngineerIrvine, CA An innovative company in the space technology sector is seeking a Senior Ground Software Engineer to join their forward-thinking team. In this role, you’ll take on complex challenges, helping to build Mission Control Systems, develop advanced tools for GNC and AI engineering teams, and architect applications that have a direct impact on high-stakes space missions. This is an opportunity to work on some of the most groundbreaking advancements in the industry, designing scalable systems, creating high-performance APIs, and driving innovation for mission-critical operations. Join the mission to shape the future of space exploration and unlock humanity’s potential beyond Earth. Key Responsibilities<ul><li>Lead the full software engineering process, from concept to deployment, establishing technical direction and driving product development.</li><li>Mentor and guide a team of engineers, providing both technical leadership and fostering a culture of continuous improvement.</li><li>Engage with users and stakeholders, translating their needs into impactful and innovative software solutions.</li><li>Architect and develop essential software systems, including Mission Control Systems and other advanced applications that support real-world space missions.</li><li>Build and maintain APIs and tools to enhance operational efficiency and scalability across internal and external systems.</li><li>Collaborate with cross-functional teams, continuously refining software products to align with evolving mission requirements.</li><li>Drive architectural discussions, design sessions, and code reviews to ensure high-quality, scalable, and secure system design.</li><li>Develop intuitive interfaces and automation tools that streamline complex tasks for operators.</li></ul> Qualifications Minimum Requirements:<ul><li>Bachelor’s degree in Computer Science, Engineering, Mathematics, or a related technical field (or equivalent practical experience).</li><li>5+ years of software development experience with a demonstrated ability to lead projects or teams.</li><li>Expertise in full-stack development, with a strong track record in designing, building, and testing complex software systems.</li><li>Experience with cloud-native architectures, microservices, and distributed systems.</li><li>Availability for on-call responsibilities and flexibility to work extended hours or weekends for mission-critical support.</li><li>Ability to obtain Secret or TS/SCI clearance.</li></ul> Preferred Skills and Experience:<ul><li>Proficiency in Ruby or Python, especially in API development (e.g., Echo, FastAPI, Express, Fastify).</li><li>Strong experience with relational databases, ideally PostgreSQL, including schema design, complex queries, and performance tuning.</li><li>Advanced knowledge of front-end frameworks like React, with an emphasis on building performant and maintainable user interfaces.</li><li>Proven experience in deploying and maintaining production-grade systems.</li><li>Familiarity with NoSQL databases (e.g., Couchbase, MongoDB, Cassandra) for scalable, distributed applications.</li></ul> Additional Preferred Qualifications:<ul><li>Experience with Kubernetes and AWS services (EC2, S3, Batch, Lambda).</li><li>Familiarity with Jira or other defect-tracking software.</li><li>Experience in data engineering and managing large-scale data pipelines.</li><li>Knowledge of real-time data processing and experience with Cosmos Open C3.</li><li>Background in the space industry or a strong interest in space exploration.</li></ul> ITAR RequirementsThis position involves access to technology subject to U.S. export controls. Candidates must meet eligibility requirements for U.S. Government export regulations, including U.S. citizenship, lawful permanent residency, refugee status, or asylee status, or be eligible to obtain necessary authorizations from the U.S. Department of State. This is an excellent opportunity for engineers with a passion for space technology to make a meaningful impact. If you’re driven by the challenge of pushing boundaries in space exploration, this role may be your next big leap.

Senior Ground Software Engineer Irvine, CA An innovative company in the space technology sector is seeking a Senior Ground Software Engineer to join their forward-thinking team. In this role, you'll take on complex challenges, helping to build Mission Control Systems, develop advanced tools for GNC and AI engineering teams, and architect applications that have a direct impact on high-stakes space missions. This is an opportunity to work on some of the most groundbreaking advancements in the industry, designing scalable systems, creating high-performance APIs, and driving innovation for mission-critical operations. Join the mission to shape the future of space exploration and unlock humanity's potential beyond Earth. Key Responsibilities Lead the full software engineering process, from concept to deployment, establishing technical direction and driving product development. Mentor and guide a team of engineers, providing both technical leadership and fostering a culture of continuous improvement. Engage with users and stakeholders, translating their needs into impactful and innovative software solutions. Architect and develop essential software systems, including Mission Control Systems and other advanced applications that support real-world space missions. Build and maintain APIs and tools to enhance operational efficiency and scalability across internal and external systems. Collaborate with cross-functional teams, continuously refining software products to align with evolving mission requirements. Drive architectural discussions, design sessions, and code reviews to ensure high-quality, scalable, and secure system design. Develop intuitive interfaces and automation tools that streamline complex tasks for operators. Qualifications Minimum Requirements: Bachelor's degree in Computer Science, Engineering, Mathematics, or a related technical field (or equivalent practical experience). 5 years of software development experience with a demonstrated ability to lead projects or teams. Expertise in full-stack development, with a strong track record in designing, building, and testing complex software systems. Experience with cloud-native architectures, microservices, and distributed systems. Availability for on-call responsibilities and flexibility to work extended hours or weekends for mission-critical support. Ability to obtain Secret or TS/SCI clearance. Preferred Skills and Experience: Proficiency in Ruby or Python, especially in API development (e.g., Echo, FastAPI, Express, Fastify). Strong experience with relational databases, ideally PostgreSQL, including schema design, complex queries, and performance tuning. Advanced knowledge of front-end frameworks like React, with an emphasis on building performant and maintainable user interfaces. Proven experience in deploying and maintaining production-grade systems. Familiarity with NoSQL databases (e.g., Couchbase, MongoDB, Cassandra) for scalable, distributed applications. Additional Preferred Qualifications: Experience with Kubernetes and AWS services (EC2, S3, Batch, Lambda). Familiarity with Jira or other defect-tracking software. Experience in data engineering and managing large-scale data pipelines. Knowledge of real-time data processing and experience with Cosmos Open C3. Background in the space industry or a strong interest in space exploration. ITAR Requirements This position involves access to technology subject to U.S. export controls. Candidates must meet eligibility requirements for U.S. Government export regulations, including U.S. citizenship, lawful permanent residency, refugee status, or asylee status, or be eligible to obtain necessary authorizations from the U.S. Department of State. This is an excellent opportunity for engineers with a passion for space technology to make a meaningful impact. If you're driven by the challenge of pushing boundaries in space exploration, this role may be your next big leap.

Junior Backend Software EngineerColorado SpringsFull time: On-site$80,000 - $130,000I am working with an exciting venture-backed startup, who build autonomous solutions for the space industry.Specializing in cutting-edge satellite technology & solutions, they offer a range of innovative products designed to enhance satellite operations and improve the management of satellite fleets.These solutions help satellite operators and organizations in the space industry optimize their resources, streamline their processes, and ultimately achieve greater efficiency and performance. Their products cover areas such as satellite tracking, data management, and communication, enabling their clients to better monitor and control their satellite assets. Their technology plays a crucial role in advancing satellite operations and contributing to the ongoing development of space exploration and communication.About You:You have a strong foundation in computer science principles and are excited to apply your knowledge to real-world problems. You are a quick learner who is open to feedback and eager to develop your skills. You are a team player who enjoys collaborating with others and contributing to a positive team environment.Role Responsibilities<ul><li>Assist in developing world-class SaaS services bringing space traffic coordination and spaceflight safety services to market</li><li>Collaborate with senior engineers and domain experts to design and implement algorithms</li><li>Participate in the software design lifecycle, contributing to proof of concept product development</li><li>Support the innovation and iteration process by incorporating feedback</li><li>Learn and apply API-first approaches to building software applications</li><li>Engage in a culture of continuous learning and professional development</li><li>Contribute to a positive engineering culture by participating in team activities and discussions</li></ul>Qualifications<ul><li>Bachelor's degree in computer science or a related field</li><li>Familiarity with Agile Software Development & Kanban methodologies</li><li>Basic knowledge of cloud computing, preferably AWS (internships or academic projects acceptable)</li><li>Proficiency in Python and exposure to at least one system-level programming language (C, C++, Rust)</li><li>Understanding of software containerization and orchestration (Docker and Kubernetes preferred)</li><li>Basic knowledge of software test methodologies</li><li>Familiarity with SQL and NoSQL databases</li><li>Comfortable working in a Linux environment</li></ul>Compensation:<ul><li>Total compensation for this role is base salary + company equity</li><li>Colorado base salary range: $80-130k</li></ul>Benefits and Perks<ul><li>Competitive salary</li><li>Company Equity</li><li>Great health insurance (medical, dental, vision)</li><li>401k</li><li>Lunch catered weekly for the Colorado office</li><li>Opportunity to have an impact on a global scale for space sustainability</li> </ul>

Senior Embedded Software EngineerLos Angeles Our exciting Space Client in Los Angeles are looking for a Senior Embedded Engineer to Architect and write the Firmware and Software that runs on their first Spacecraft. You will help define how they Communicate with, Control, Update, and ultimately Troubleshoot the vehicle in-mission, and as such, comes with significant responsibility. Beyond the first mission, you will be able to scale your initial Architecture into their next vehicles that they intend to produce at scale. Responsibilities: <ul><li>Write and test flight-ready software that integrates C&DH, GNC algorithms, system telemetry, health and management, and fault management that runs on operating firmware that you also write or down-select.</li><li>Support avionics subsystems testing </li><li>Write mission management software and visualization tools</li><li>Create SITL test fixtures</li><li>Improve the functionality of GNC fault tolerance</li><li>Design their watch-dog systems </li><li>Operate very autonomously</li></ul> Ideal Qualifications: <ul><li>Experience writing and shipping stand-alone, from scratch C/C++ code for Robotics, Autonomous Vehicles, Drones, Spacecraft, etc</li><li>Strong understanding of electrical engineering and computer architecture</li><li>Experience with software dev best practices</li></ul> If you are interested then please apply today!

Junior Backend Software Engineer Colorado Springs Full time: On-site $80,000 - $130,000 I am working with an exciting venture-backed startup, who build autonomous solutions for the space industry. Specializing in cutting-edge satellite technology & solutions, they offer a range of innovative products designed to enhance satellite operations and improve the management of satellite fleets. These solutions help satellite operators and organizations in the space industry optimize their resources, streamline their processes, and ultimately achieve greater efficiency and performance. Their products cover areas such as satellite tracking, data management, and communication, enabling their clients to better monitor and control their satellite assets. Their technology plays a crucial role in advancing satellite operations and contributing to the ongoing development of space exploration and communication. About You: You have a strong foundation in computer science principles and are excited to apply your knowledge to real-world problems. You are a quick learner who is open to feedback and eager to develop your skills. You are a team player who enjoys collaborating with others and contributing to a positive team environment. Role Responsibilities <ul> <li>Assist in developing world-class SaaS services bringing space traffic coordination and spaceflight safety services to market </li><li>Collaborate with senior engineers and domain experts to design and implement algorithms </li><li>Participate in the software design lifecycle, contributing to proof of concept product development </li><li>Support the innovation and iteration process by incorporating feedback </li><li>Learn and apply API-first approaches to building software applications </li><li>Engage in a culture of continuous learning and professional development </li><li>Contribute to a positive engineering culture by participating in team activities and discussions </li></ul> Qualifications <ul> <li>Bachelors degree in computer science or a related field </li><li>Familiarity with Agile Software Development & Kanban methodologies </li><li>Basic knowledge of cloud computing, preferably AWS (internships or academic projects acceptable) </li><li>Proficiency in Python and exposure to at least one system-level programming language (C, C++, Rust) </li><li>Understanding of software containerization and orchestration (Docker and Kubernetes preferred) </li><li>Basic knowledge of software test methodologies </li><li>Familiarity with SQL and NoSQL databases </li><li>Comfortable working in a Linux environment </li></ul> Compensation: <ul> <li>Total compensation for this role is base salary + company equity </li><li>Colorado base salary range: $80-130k </li></ul> Benefits and Perks <ul> <li>Competitive salary </li><li>Company Equity </li><li>Great health insurance (medical, dental, vision) </li><li>401k </li><li>Lunch catered weekly for the Colorado office </li><li>Opportunity to have an impact on a global scale for space sustainability </li> </ul>

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