r/DataScienceJobs • • 9h ago

Discussion McKinsey QuantumBlack Data Scientist II – HackerRank assessment, what to expect?

5 Upvotes

Hi all,

I just got invited to the HackerRank online assessment for a Data Scientist II role at QuantumBlack (McKinsey), based in Canada. The invite says it could include coding, data modelling, technical knowledge or Excel exercises, and mine is 90 minutes long, so I’m trying to get a sense of what fits into that time.

For anyone who’s taken it recently:

  • What was the format? How many questions, and what split between SQL, Python and multiple choice?
  • Was there a modelling task, and if so, what kind (classification, regression, time series)? Was scikit-learn available?
  • How was the time pressure in the 90 minutes? Did you finish everything?
  • Was it proctored (webcam or screen sharing)?
  • Can we look up syntax through the Hackerrank platform?
  • Any surprises or things you wish you’d practised more?

    Thanks in advance, and happy to share my experience afterwards!


r/DataScienceJobs • • 12h ago

Hiring [Hiring] Senior Data Scientist at Temporal Technologies | Remote - US | $137K - $220K

5 Upvotes

About the Role

The Data Scientist, Product Growth and Experimentation will help drive decision making in support of our Product Led Growth function.

This role sits at the intersection of Data, Product, Growth, and GTM. You will work deeply embedded within the Product and Engineering teams focused on PLG. Your focus will be illuminating the user journey from initial interest to fully adopted and all the steps in between. You will surface friction points in the onboarding process and identify behaviors that are indicative of successful adoption. You will evaluate interventions that help us to bring the value of Temporal to more users.

You will work effectively across both large data, clean data sets and data sets with constraints in duration and sample size to provide well-informed recommendations and conclusions. You will bring deep knowledge and practical experience with statistical methods including matched comparisons, quasi‑experimental methods, and uncertainty measurements to help overcome these constraints.

The ideal candidate possesses strong analytical judgment and practical product sense. Ambiguous business questions do not intimidate you. You have a keen sense for when additional data or analysis could materially change a conclusion, and when it wouldn’t. You apply analytical rigor while balancing what is functionally required to advance a project. Your aim is to drive better decisions and faster learning through measurable customer outcomes.

What You’ll Do

  • Act as an embedded Data partner to Product, Design, and Engineering, helping shape strategy, product proposals, and experiments from the earliest stages.
  • Build analytical frameworks across the full PLG journey from acquisition and activation through engagement, adoption, expansion, monetization, and durability
  • Use funnel, cohort, journey, and sequence analysis to identify friction and opportunities for improvement.
  • Identify the behaviors and milestones that predict conversion, production readiness, expansion, churn, and long‑term customer success, and translate them into leading indicators for successful or stalled accounts.
  • Analyze feature discovery and adoption patterns to recommend interventions that increase successful adoption and expansion.
  • Design and evaluate experiments and product changes, using matched comparisons, pre/post‑intervention analysis, causal methods, and other appropriate techniques when conventional A/B testing is not practical.
  • Clearly distinguish observed results from assumptions, quantify uncertainty, and explain the confidence behind each conclusion.
  • Help prioritize growth opportunities based on potential impact, confidence, effort, and measurement feasibility.
  • Build reusable datasets, metrics, dashboards, and analytical tools that reduce ad hoc work and make insights accessible to Product, Marketing, Sales, and leadership.
  • Partner with Engineering and Data Engineering to improve event instrumentation, data quality, and the analytical models required for reliable product analysis.
  • Communicate findings through clear visualizations, written narratives, and practical recommendations for technical and non‑technical audiences.

What You’ll Focus on First

During your first several months, you will help the team: - Audit signals currently captured in the onboarding flow and recommend new instrumentation as needed - Establish reporting and repeatable analysis for PLG experiments. - Analyze user behavior after the first successful Activity or Workflow. - Identify signals of production readiness and common points where users stall. - Map feature‑adoption paths across important product areas.

What You’ll Bring

  • A strong foundation in statistics, experimental design, causal reasoning, and quantitative analysis.
  • Experience using product, behavioral, or event data to improve activation, engagement, retention, conversion, or expansion.
  • Experience working with small samples, noisy signals, imperfect control groups, or environments where standard A/B testing is not always possible.
  • Strong judgment in choosing methods that fit the decision, available data, and level of uncertainty.
  • Proficiency in SQL and Python for analysis, modeling, and automation.
  • Experience with cohort analysis, funnel analysis, segmentation, predictive modeling, and supervised or unsupervised machine‑learning methods.
  • Ability to prototype quickly in notebooks and convert recurring analyses into reliable data products, models, or workflows.
  • Experience with modern data platforms and query engines such as Athena, Presto/Trino, BigQuery, or Snowflake.
  • Familiarity with cloud and object‑store technologies such as AWS S3.
  • Experience building dashboards and reusable analytical assets in a modern business intelligence platform.
  • Comfort working with evolving definitions, incomplete instrumentation, and trade‑offs between analytical precision and decision usefulness.
  • A results‑oriented mindset and a record of translating analysis into product or business action.
  • Strong communication skills, including the ability to explain methods, uncertainty, and recommendations in plain language.
  • Curiosity about developer platforms, cloud infrastructure, usage‑based products, and how customers adopt technically complex products.
  • A collaborative approach and the ability work effectively with Product, Engineering, Marketing, Sales, Finance, and Data partners.

Compensation

  • Tier 1: $172K – $220K • Offers Equity
  • Tier 2: $154K – $195K • Offers Equity
  • Tier 3: $137K – $175K • Offers Equity

Compensation ranges reflect salary across several geographic markets. Employment offers carefully consider multiple factors, including prior experience, knowledge, expertise, skillset, market location, and job level assessed during the interview process.

Apply: Senior Data Scientist at Temporal Technologies


r/DataScienceJobs • • 15h ago

Discussion Job market motivated me to start selling products of my own

2 Upvotes

I have been searching for a fulltime job since May and I haven't been able to get more than 3 interviews. The market is not doing well, we all know that but the calamity inspired me to earn from other ways. These last few months I was working on skilling up and becoming more employable, I kept coming across videos of Agentic AI and product engineering and something struck me. I had created a project to showcase my data science skills and now I am turning it into a sellable product but via vibe coding since I am not a SD.

I see this as a silver lining, share something of your own?