Prepare for and practice interview questions from Selby Jennings.

Selby Jennings Interview Questions

Selby Jennings Interview Guides

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?

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

Selby Jennings Salaries by Position

About: Selby Jennings has partnered with the Quantitative Strategies team of an elite, multi-strategy hedge fund. This is a team of individuals coming from various backgrounds between big tech and the quant space. They are looking for talented developers who can work rapidly on implementing and supporting technical processes and infrastructure for automated trading strategies in both equity statistical arbitrage and volatility arbitrage. Qualifications:<ul><li>Bachelors (Master's or PhD preferred) in Computer Science, Math, Physics, or related field</li><li>A minimum of 2 years of professional experience in Python, including package development</li><li>Experience in UNIX/Linux/BSD environments</li><li>Experience with relational database management system (PostgreSQL, MySQL, etc)</li><li>Proficiency in one object-oriented or lower-level language (Java/C++/C)</li></ul> Responsibilities:<ul><li>Work directly as member of the Quantitative Development team, collaborating daily with other Quantitative Developers, Researchers, and Portfolio Managers.</li><li>Develop quantitative infrastructure for alpha generation, portfolio construction, and algorithmic trading.</li><li>Provide software contributions to evolve the Quantitative strategies platform and support daily alpha construction and trading, including:</li><li>Develop the proprietary trading system, data warehouse, service-based architecture, machine learning platforms, and simulation tooling.</li><li>Work directly with traders and researchers to build new proprietary trading strategies and alphas.</li><li>Provide high-level technical and investment support to the team.</li><li>Parse and analyze new data sources such as exchange data, company fundamental data, or unstructured data.</li><li>Design reporting and analysis tools for strategy risk, trade cost and execution using data from a proprietary columnar database.</li><li>Own the end-to-end design, implementation, and launch of software projects spanning the technical domains described above.</li></ul> Value Added:<ul><li>Experience with Git</li><li>Experience with KDB/Q</li><li>Familiarity with popular machine learning/deep learning/statistical packages (such as scikit-learn, TensorFlow, PyTorch, etc.)</li></ul>

Desktop Engineering Manager | Leading Asset Management Firm | Boston, MA (Hybrid) NO C2C or C2H Overview:One of Boston's leading asset management firms is seeking a motivated desktop engineering professional who can be a hands on team lead for their Microsoft Endpoint Management Technologies! This opportunity provides a strong team culture, surrounded by experienced professionals in the tech space. You will, as mentioned, be a hands on leader for the team, evaluating, maintaining, and enhancing their Service Desk offerings. Responsibilities:<ul><li>Proactively enhance their current desktop environment</li><li>Maintain different infra related to Windows, Apple MDM, and more</li><li>Partner with InfoSec team colleagues to ensure proper security for endpoints and respective supporting services</li><li>Act as a tier 3 support POC, handling escalation issues from respective team</li><li>Package Software for automated deployments within the environment</li></ul> Requirements:<ul><li>Deep understanding of Windows Technologies, such as WMI/WQL, Installer, and more</li><li>Significant expertise within the M365 application ecosystem (Autopatch, Autopilot, Intune, Entra, and more)</li><li>Focused expertise within Intune</li><li>Experience with scripting/programming languages (Powershell, or Python) alongside SQL querying ability</li><li> Power BI or Power platform exposure a plus</li><li>Financial experience a plus</li></ul>

One of our tier 1 hedge fund clients are looking to add a (Senior) Data Scientist to the London office as part of their Equities Fund. You will be working alongside the investment and research teams to generate new insights, drive ML and advanced analytics, and work with the research team towards generating sustained alpha. Responsibilities: <ul><li>Coordinate with investment teams to comprehend their investment methodologies and leverage data to augment their research processes.</li><li>Support investment teams in identifying key data drivers impacting companies and sectors.</li><li>Analyze data from various sources to validate complex investment hypotheses.</li><li>Efficiently process data, identify critical points, and assess data relevance to investment inquiries.</li><li>Deliver high-caliber research to investment teams in a clear and concise manner.</li><li>Utilize existing and new datasets to develop significant insights and decision support tools for investment teams.</li></ul> Required Skills: <ul><li>Advanced knowledge and experience with Python (Pandas, NumPy + more) and SQL</li><li>Strong background in advanced analytics and statistical modelling</li><li>Strong analytical and quantitative skills</li><li>Experience working with large, unstructured data sets</li><li>Prior experience in the investment management industry, with good knowledge on equities </li><li>Experience with Bloomberg or similar platforms</li></ul> If you feel this is a good match - apply today!

One of the world's most successful proprietary trading firms who rely heavily on high performant technology to give them an edge are looking to bring a unique data scientist to join their post-trade analytics group. You will be responsible for driving major decisions around trading strategy, and linking PnL metrics with latency and other infrastructure performance measurements. What you will do<ul><li>Identify relationships between business metrics and changes on the infrastructure technology</li><li>Conduct research for the purpose of modeling exchange performance</li><li>Develop and improve quantitative research frameworks</li></ul> What you will need<ul><li>At least 3+ years of programming experience in Python with a data science and analytics focus</li><li>Background in statistics</li><li>Understanding of network protocols (IP, UDP, TCP, Ethernet) is a plus.</li></ul>

My client is a Systematic Hedge Fund based here in Boston, searching for senior software engineers with strong development experience in C# and AWS. You will work on a highly quantitative trading platform that drives the firm's global trading operation. Responsibilities<ul><li>Build an investment system platform that supports quant researchers and traders</li><li>Participate in building an investment product from 0-1</li><li>Production support of the platform to avoid disruption to investment processes</li><li>Act as the liaison between the front and back office</li></ul> Qualifications<ul><li>Expert in C#. Python is a Plus!</li><li>Experience building products on the cloud (AWS)</li><li>Relevant experience with SQL and related databases</li><li>Comfortable with system design and architecture at a high level</li></ul> This firm operates on a hybrid schedule and has a very competitive compensation package. If you are looking to make a substantial impact at a leading trading firm, do not hesitate to apply *NO C2C*

Senior Front-Office Software Engineer (Python)Company: Leading Trading FirmLocation: London, UK (on-site) Job Description: We are seeking a highly skilled Senior Software Engineer to join our client's dynamic team. The ideal candidate will have hands-on experience in a front office role, collaborating closely with quantitative researchers and traders to develop and optimise trading strategies. It is important to only apply if you have proven experience on the whole SDLC in Python. Key Responsibilities:<ul><li>Design, develop, and maintain high-performance trading systems and tools.</li><li>Work directly with quants and traders to translate requirements into robust software solutions.</li><li>Enhance existing platforms to improve speed, reliability, and functionality.</li><li>Implement algorithms and integrate data feeds in real-time.</li></ul> Qualifications:<ul><li>6+ years proven experience in a software engineering role within a trading environment.</li><li>Expert in Python programming language for building applications.</li><li>Solid understanding of algorithms, data structures, and high-frequency trading.</li><li>Excellent problem-solving skills and attention to detail.</li><li>Ability to work under pressure in a fast-paced environment.</li><li>Ability to own end to end engineering processes</li><li>Communication skills are very important for collaboration.</li></ul> Compensation:<ul><li>Highly competitive salary with performance-based bonuses.</li><li>Comprehensive benefits package.</li></ul> Apply Now!

Our client, a world-leading finance firm, is seeking a Senior Software Engineer with expertise in Python to join their London office. The role involves building and deploying infrastructure, embracing cloud-native design, and promoting new technology across the organisation’s ecosystem. Key responsibilities include driving the modernisation of critical tools, platforms, and infrastructure to enhance organizational efficiency. The ideal candidate will be a strong communicator, engaging with end users across multiple teams to understand pain points and requirements, and delivering solutions that exceed user expectations for the firm's most critical platform. Responsibilities:<ul><li>Engage with end users across multiple teams to understand current pain points and requirements, considering potential trade-offs.</li><li>Deliver solutions for the firm's most critical platform that exceed user expectations.</li><li>Collaborate closely with a team of five developers to modernize the platform.</li><li>Deliver reliable and scalable results.</li><li>Enable workflows to adopt more cloud-native architectures.</li></ul> Requirements:<ul><li>BS or MS in a highly technical field.</li><li>6+ years of software development experience, with a strong track record of building high-quality software in Python.</li><li>Experience with Python environments (Conda, Pip, etc.).</li><li>Batch processing experience across on-prem and cloud environments.</li><li>Proficiency in cloud architecture and best practices for running high-availability services.</li></ul>

Selby Jennings Interview Questions

Selby Jennings Interview Guides

Selby Jennings Interview Questions

Selby Jennings Salaries by Position

Selby Jennings Opening Jobs