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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

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

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?

Evona Salaries by Position

Backend-Focused Full Stack Engineer (Python/React) Remote - US Contract to hire EVONA has partnered with a trailblazer in geospatial analytics, empowering organizations reliant on scientific insights from real-world events. As a remote-first organization, they prioritize your well-being, productivity, and career growth, offering a flexible work environment that aligns with your lifestyle. What You Will Do:<ul> <li>Design, develop, and maintain backend services and APIs to support our geospatial analytics platform. </li> <li>Collaborate with our team of skilled engineers and scientists to deploy scalable backend solutions. </li> <li>Optimize and enhance performance and reliability of our data processing pipelines. </li> <li>Implement and maintain scalable fullstack solutions, with a strong emphasis on backend architecture. </li> <li>Contribute to internal and external documentation efforts. </li> <li>Champion best practices for code quality, testing, and deployment efficiency. </li> <li>Mentor colleagues through code reviews and paired programming, fostering a positive team culture. </li> <li>Participate in oncall rotations to uphold service reliability and troubleshoot backend issues. </li> </ul> What You Need:<ul> <li>7+ years of experience in backend or fullstack engineering, or a related field. </li> <li>Bachelor's degree in computer science, software engineering, or equivalent practical experience. </li> <li>Proficiency in backend technologies including Python, microservices, databases, and CI/CD. </li> <li>Experience with frontend technologies such as React and TypeScript. </li> <li>Demonstrated experience in developing and maintaining scalable backend services and APIs. </li> <li>Strong commitment to testing and code quality assurance. </li> <li>Familiarity with serverside concepts like microservices, caching, and deployment pipelines. </li> </ul> Tech Stack:<ul> <li>Python </li> <li>AWS </li> <li>gRPC </li> <li>TensorFlow, Flask, NumPy, SciPy </li> <li>Kubernetes </li> <li>Firestore, Elasticsearch, Redis </li> <li>Git, Bazel, Drone, Spinnaker </li> <li>GDAL, S2, Proj4 </li> <li>React, Redux, TypeScript, Webpack </li> <li>SASS </li> </ul> Apply now and join a geospatial leader who truly puts their people first.

Ready to join a rapidly expanding company and be an integral part of it's growth journey? ???? We're partnering with an innovative company specializing in Earth Observation solutions. Committed to excellence in imagery processing, they empower customers to extract valuable information from aerial and satellite earth observing platforms. The company is seeking its first Product Manager to oversee its range of products, manage updates and new releases, and align offerings with client needs. The ideal candidate will have geospatial/earth observation experience to effectively position products across various industries. Key Responsibilities:<ul><li>Product Lifecycle Management: Oversee the product lifecycle from inception to launch and updates.</li><li>Client Engagement: Gather business requirements while communicating with customers and engage with clients to identify needs and gather feedback.</li><li>Roadmap Definition: Define a product roadmap and build strategies by understanding the company's vision and business expectations.</li><li>Collaboration: Work closely with development teams on product features and roadmaps. Brainstorm user requirements with the team to break them down into smaller user stories.</li><li>Product Positioning: Develop strategies to effectively position products in different industries. Perform competitive analysis, monitor market trends, analyze data, and build product solutions that meet customer expectations.</li><li>Performance Tracking: Monitor product performance and conduct regular business reviews. Review deliverables with the development team to ensure acceptance criteria are met.</li><li>Demonstration: Demonstrate product deliverables to customers.</li><li>Technical Collaboration: Collaborate with cross-functional teams, engineering managers, and architects to discuss technical features, issues, and risks.</li><li>Innovation: Engage with data scientists, support, and customer success teams to identify innovative solutions.</li></ul> Key Requirements:<ul><li>Experience in product management, preferably within the geospatial or earth observation sectors.</li><li>Strong understanding of remote sensing, digital photogrammetry, image analysis, and related technologies.</li><li>Experience in SaaS product management.</li><li>Proven ability to work closely with clients and deliver valuable solutions.</li><li>Strategic thinking and effective communication skills.</li><li>Bachelor’s degree in Geography, Geomatics, Computer Science, or a related field; advanced degrees or certifications are a plus.</li></ul> Join this dynamic company and contribute to shaping the future of geospatial technology! Please apply now or connect with Chloe at EVONA via email at c.jakeways@evona.com.

Software Engineering LeadLocation: Boulder, COPosition Type: PermanentIndustry: Software Development, SpaceSalary: $135,000 - $160,000 Role Overview:We are seeking an experienced Software Engineering Lead to drive the successful execution of software projects from planning through delivery. In this role, you will collaborate with stakeholders and product owners to establish priorities, develop project schedules, and create a clear strategy for the engineering team. Your leadership will be essential in ensuring that all software delivery deadlines are met and that the team remains aligned with project objectives. Key Responsibilities:- Collaborate with stakeholders and product owners to set project priorities and develop detailed schedules.- Create and execute a clear strategy for the engineering team, ensuring alignment with project goals and timelines.- Provide technical guidance and leadership to the engineering team, helping to resolve any issues that arise during the development process.- Build and maintain a staffing plan that meets the needs of the project, ensuring that the team is equipped to handle all development tasks.- Monitor progress and ensure that all software delivery deadlines are achieved, addressing any challenges proactively to keep projects on track.- Foster a collaborative and productive environment within the team, encouraging continuous improvement and innovation. Qualifications:- Experience: Proven experience in software engineering leadership, with a track record of successfully managing and delivering complex software projects.- Technical Skills: Strong technical background in software development, with the ability to provide hands-on guidance and support to the engineering team.- Project Management: Expertise in project scheduling, strategy development, and team management, with a focus on meeting deadlines and achieving objectives.- Leadership: Excellent leadership and communication skills, with the ability to inspire and guide a diverse engineering team. Why Join Us? This role offers the opportunity to lead a talented engineering team in delivering high-quality software solutions that meet critical deadlines. As a Software Engineering Lead, you will play a pivotal role in shaping the success of our projects and driving innovation in the software development process. If you are a results-oriented leader with a passion for software engineering, we invite you to apply.

Salary: up to $235k We’re exclusively partnered with one of L.A’s most exciting human flight space start-ups where you will help lead flight software development Flight Software Engineer Responsibilities: <ul><li>Develop flight software for inflight computers and other critical spacecraft hardware.</li><li>Collaborate with the Electrical and Hardware division to seamlessly integrate software solutions</li><li>Configure RTOS, Microprocesses, and Linux Kernels/Drivers</li><li>Design and execute full software test cases</li></ul> Flight Software Engineer Requirements: <ul><li>Experience coding in C++ and Linux environments (or relevant experience)</li><li>Knowledge of hardware datasheets and schematics</li><li>Tools: Git, Make, and GNU tools</li><li>Related degree in Engineering, Electrical Engineering, Computer Science, or similar disciplines</li></ul> If you have previous flight software experience and are interested in joining one of California’s most exciting space start-ups, then reach out to Zee Lone at EVONA

Remote Sensing Data Scientist Mountain View, CA or Remote $95k - $195K About the Role: We are building an expert team to design and generate value-added products from Earth observations using our constellation of low Earth orbit satellites and other geospatial datasets. We are seeking a Remote Sensing Data Scientist to join our Science Team. The ideal candidate will help develop algorithms and process data from our spacecraft's instruments, ensuring high-quality science data with minimal latency to support our goals in climate change monitoring and mitigation. This role involves working with various instrument types and requires flexibility to handle diverse topics. Responsibilities: - Develop and refine algorithms for data processing pipelines. - Create advanced data products from remote sensing observations. - Collaborate with scientists and data teams to improve data products. - Stay updated with new topics and techniques in measurements, retrieval concepts, and data platforms/tools. Qualifications: - Experience developing algorithms using data from remote sensing/RF instruments. - Proficient in machine learning techniques/platforms (e.g., TensorFlow, PyTorch). - Exceptional skills in Python-based development and analysis. - Ability to work with a distributed, interdisciplinary team. Preferred Qualifications: - Experience with retrieval algorithms from satellite Earth observations. - Knowledge of geospatial data products and formats (HDF5, Zarr, COG). - Understanding of scientific instrument principles. - Familiarity with cloud-native systems (preferably AWS). If you are interested in this position, please apply now!

Location: Denver, Colorado (Hybrid)Salary: Up to $170k base + equity + benefits This Satellite / New-Space company is deploying a next-generation Space Communications infrastructure As a Lead Embedded Software Engineer, you'll lead the full development of mission-critical embedded software on their satellites, as they continue to build and launch. Lead Embedded Software Engineer Responsibilities<ul><li>Develop the full software lifecycle and architecture for embedded software systems on new LEO satellites (Embedded C, Embedded Linux)</li><li>Lead HiL (Hardware In Loop) testing, on-vehicle testing, and eventual integration and deployment of Flight and Embedded Software algorithms</li><li>Support the adjacent development of propulsion, avionics, hardware, and other spacecraft systems</li><li>Report directly to Heads of Engineering and take full ownership of the embedded software design</li></ul> Lead Embedded Software Engineer Requirements<ul><li>3+ years of experience developing complex embedded systems in Space or related industries (Drones, UAVs, Autonomous Driving etc.)</li><li>Excellent C/Linux embedded software skills (Pentalinux or Yocto ideally too)</li><li>FPGA or low-level hardware/bare-metal knowledge desired</li><li>Python knowledge (test, automation, etc.)</li></ul> A US Green Card or Citizenship is required! If you would like to work on brand new and next-generation LEO satellites, and have previous lead embedded software engineer experience, then reach out to Zee Lone at EVONA

Location: Boulder, Colorado (Hybrid)Salary: Up to $170k base + equity + benefits This Satellite / New-Space company is deploying a next-generation Space Communications infrastructure As an Embedded Software Engineer, you'll lead the full development of mission-critical embedded software on their satellites, as they continue to build and launch. Embedded Software Engineer Responsibilities<ul><li>Develop the full software lifecycle and architecture for embedded software systems on new LEO satellites (Embedded C, Embedded Linux)</li><li>Lead HiL (Hardware In Loop) testing, on-vehicle testing, and eventual integration and deployment of Flight and Embedded Software algorithms</li><li>Support the adjacent development of propulsion, avionics, hardware, and other spacecraft systems</li><li>Report directly to Heads of Engineering and take full ownership of the embedded software design</li></ul> Embedded Software Engineer Requirements<ul><li>3+ years of experience developing complex embedded systems in Space or related industries (Drones, UAVs, Autonomous Driving etc.)</li><li>Excellent C/Linux embedded software skills (Pentalinux or Yocto ideally too)</li><li>FPGA or low-level hardware/bare-metal knowledge desired</li><li>Python knowledge (test, automation, etc.)</li></ul> A US Green Card or Citizenship is required! If you would like to work on brand new and next-generation LEO satellites, and have previous embedded software engineer experience, then reach out to Zee Lone at EVONA

Location: Boulder, Colorado (Hybrid)Salary: Up to $170k base + equity + benefits This New-Space Satellite Communications company is seeking a Senior Embedded Software Engineer, to lead the full development of mission-critical embedded software on their satellites. Senior Embedded Software Engineer Responsibilities<ul><li>Develop the full software lifecycle and architecture for embedded software systems on new LEO satellites (Embedded C, Embedded Linux)</li><li>Lead HiL (Hardware In Loop) testing, on-vehicle testing, and eventual integration and deployment of Flight and Embedded Software algorithms</li><li>Support the adjacent development of propulsion, avionics, hardware, and other spacecraft systems</li><li>Report directly to Heads of Engineering and take full ownership of the embedded software design</li></ul> Senior Embedded Software Engineer Requirements<ul><li>3+ years of experience developing complex embedded systems in Space or related industries (Drones, UAVs, Autonomous Driving etc.)</li><li>Excellent C/Linux embedded software skills (Pentalinux or Yocto ideally too)</li><li>FPGA or low-level hardware/bare-metal knowledge desired</li><li>Python knowledge (test, automation, etc.)</li></ul> A US Green Card or Citizenship is required! If you would like to work on brand new and next-generation satellites/space communication, and have previous senior embedded software engineer experience, then reach out to Zee Lone at EVONA

Lead Embedded Software EngineerDenver, CO$120,000 - $180,000(Hybrid) My client builds and operates a diverse range of small satellite systems supporting space-based turnkey missions for several business applications. In addition to various science and exploration applications, this includes earth observation, communications, in-orbit demonstrations, and risk reduction opportunities. Position SummaryDesign, write, test, document, debug, bring up, and deploy software to microcontrollers and microprocessors for spacecraft subsystems. Contribute to mission schedule definition and keep projects on track. Primary Duties and Responsibilities<ul><li>Quickly learn our existing spacecraft system architecture and adapt the software to new mission requirements.</li><li>Estimate workload and duration of high-level tasks and work with colleagues to share effort.</li><li>Work with customers, program managers, and system engineers to ensure the project stays within scope.</li><li>Closely support customers with the integration of their payload into our bus.</li><li>Oversee the entire software development lifecycle from conception to deployment.</li><li>Be a forcing function to gather necessary information and resources from stakeholders.</li><li>Work with Electrical, RF, and Software engineers to implement new subsystems or design revisions of embedded computers that communicate with core flight software.</li><li>Maintain and enhance existing embedded software.</li><li>Write C and Python drivers for integrated circuits I2C, SPI, UART or other interfaces based on manufacture datasheets.</li><li>Work in the lab to test and debug hardware, peripherals, and payloads.</li><li>Create board support packages (BSP) for internal custom designs.</li><li>Write interface control documents (ICD) or Application Programming interfaces (API) and core flight software drivers for the embedded systems.</li><li>Gain a system level understanding of Astro Digital spacecrafts.</li><li>Occasionally fill in for higher level software tasks.</li></ul> Minimum Qualifications<ul><li>At least 5 years of professional experience, ideally in aerospace or in part a leadership or product ownership position.</li><li>Proven experience in leading and managing software projects.</li><li>Ability to work effectively in a collaborative team environment.</li><li>BS in Software Engineering, Computer Science, or related field.</li><li>Proficient in C or C++ programming. Comfortable with Python.</li><li>Experience with Embedded-C or RTOS: threads, interrupts, concurrency, HAL.</li><li>Experience developing hardware drivers for SPI, UART, and I2C peripherals.</li><li>Comfortable with command-line environments (Linux) and scripting.</li><li>Ability to work independently with minimal guidance.</li><li>Familiarity with network abstraction layers.</li><li>Excellent written and verbal communications skills.</li></ul> Preferred Qualifications<ul><li>Experience with building systems like Yocto, CMake, using device trees, linking libraries, etc.</li><li>Experience with Zephyr RTOS or the MSP430 microcontroller.</li><li>Experience with Linux kernel module driver development. Networking is a plus.</li><li>Xilinx Zynq/FPGA knowledge and software toolchain.</li><li>General hardware stills (reading schematics, probing with instrumentation, etc.).</li><li>Familiarity with GNU Radio or Software Defined Radios (SDR).</li><li>Familiarity with HAM radio, RF Engineering or low-level protocols.</li></ul> Salary<ul><li>$120,000 - $180,000 and employee stock options, based on experience.</li></ul> U.S. citizenship, U.S. legal permanent resident status, or protected person status under 22 CFR §120.15 and 8 U.S.C. § 1324b(a)(3) is required.

Evona Interview Questions

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Evona Interview Questions

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