Instacart interview questions

Showing 61–87 of 87 results

• Investigate Instacart Revenue Decline Using Weekly DataMedium

  Instacart analytics prompt on investigating a 4% weekly revenue decline, covering time-series anomaly detection, seasonality, changepoints, prediction intervals, and richer-data decomposition by orders, AOV, geography, cohorts, and categories.

  InstacartData ScientistAnalytics & ExperimentationTechnical Screen
• Investigate marketplace metrics and experiment rolloutEasy

  This question evaluates competency in marketplace analytics, causal inference, experimentation design, metric instrumentation, cohort and retention analysis, and trade-off reasoning between core business metrics and secondary signals.

  InstacartData ScientistAnalytics & ExperimentationTechnical Screen
• Justify Instacart fit and leaving your roleMedium

  This question evaluates a data scientist's ability to articulate company and product-market fit, quantify near-term impact, communicate transition logistics, and demonstrate self-awareness through managerial feedback and constraints.

  InstacartData ScientistBehavioral & LeadershipHR Screen
• Lead a zero-to-one initiative effectivelyHard

  This question evaluates a data-oriented leader's ability to translate an ambiguous mandate into a measurable initiative by testing skills in problem definition, metric design, discovery and experimentation planning, stakeholder alignment, prioritization, and trade-off reasoning within a two-sided marketplace context.

  InstacartData ScientistBehavioral & LeadershipHR Screen
• Library Catalog and Lending System: Five-Phase Engineering AssessmentHard

  This problem tests the ability to design an extensible lending system, implement a search algorithm with concurrency constraints, and debug race conditions in a multi-threaded environment.

  InstacartSoftware EngineerSoftware Engineering FundamentalsOnline Assessment
• Make a Variable Resolver Safe for Production UseMedium

  Analyze variable-resolution complexity and improve stack safety, validation, cycle detection, error reporting, caching, and update consistency.

  InstacartSoftware EngineerSoftware Engineering FundamentalsOnsite
• Optimize file reading and expression DFSMedium

  This interview question evaluates algorithm design, data structures, correctness, complexity, edge cases, and implementation details in a realistic interview setting. A strong answer for Optimize file reading and expression DFS states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.

  InstacartSoftware EngineerCoding & AlgorithmsHR Screen
• Optimize file reads for password validationMedium

  This question evaluates proficiency in on-disk file I/O, streaming algorithms, offline indexing for sublinear lookups, and system-level performance considerations for validating credentials in large files.

  InstacartSoftware EngineerCoding & AlgorithmsHR Screen
• Parse Pipe-Delimited Order Lines: Totals, Cheapest Promotion per SKU, Aisle OrderingMedium

  A three-part coding exercise that parses pipe-delimited order lines with prices in cents, applies the cheapest of several percentage and buy-X-get-Y promotions per SKU, and orders products by aisle with frozen items last. It tests input validation, exact money arithmetic, extensible pricing rules and composite sorting.

  InstacartSoftware EngineerSoftware Engineering FundamentalsOnsite
• Parse a password from a matrixMedium

  This question evaluates proficiency in grid traversal, sequence-driven state tracking, string manipulation, and boundary/obstacle validation while requiring time and space complexity reasoning.

  InstacartSoftware EngineerCoding & AlgorithmsOnsite
• Parse password from indexed matrix fileMedium

  This question evaluates file parsing, matrix indexing with a specified coordinate origin, handling multiple indexed blocks, and string assembly into an ordered password, testing competencies in file I/O, coordinate transformations, and robust input handling.

  InstacartSoftware EngineerCoding & AlgorithmsOnsite
• Past Project Deep Dive: Technical Trade-offs and Handling a Technical DisagreementMedium

  A behavioral round built around a past project: walk through it, explain a significant technical trade-off and why you chose it, and describe how you handled a disagreement over a technical decision. It tests ownership, decision-making with evidence and collaboration, rewarding specific detail over general statements.

  InstacartSoftware EngineerBehavioral & LeadershipTechnical Screen
• Pivot data without date librariesMedium

  This question evaluates a candidate's competency in data manipulation and transformation, specifically pivoting tall datasets into wide views, handling missing metric values, ordering ISO date strings via string operations, and meeting algorithmic efficiency constraints (O(n log n)).

  InstacartSoftware EngineerData Manipulation (SQL/Python)Onsite
• Pivot order-status countsMedium

  This interview question evaluates algorithm design, data structures, correctness, complexity, edge cases, and implementation details in a realistic interview setting. A strong answer for Pivot order-status counts states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.

  InstacartSoftware EngineerCoding & AlgorithmsOnsite
• Pivot transactions by date without date libsMedium

  This question evaluates proficiency in data manipulation, string-based date handling, aggregation and pivot transformations, along with reasoning about data structures, de-duplication and missing-value filling.

  InstacartSoftware EngineerData Manipulation (SQL/Python)Onsite
• Recommend and validate a budget allocation strategyMedium

  This question evaluates a data scientist's competency in budget allocation, experimental design, KPI definition, segmentation, and causal inference by requiring translation of SQL-derived spend and profitability insights into constrained program- and advertiser-level budget rules while managing concentration risk.

  InstacartData ScientistAnalytics & ExperimentationTechnical Screen
• Reserve Cart Inventory Without OversellingMedium

  Design a high-throughput inventory reservation system that locks stock when items are added to a cart, prevents overselling during flash promotions, handles automatic reservation expiration, and scales seamlessly under a 10x traffic spike.

  InstacartSoftware EngineerSystem DesignOnsite
• Resolve a Variable Through Literal and Reference AssignmentsMedium

  Resolve a target variable through an acyclic chain of named assignments until reaching an integer literal, independent of definition order.

  InstacartSoftware EngineerCoding & AlgorithmsOnsite
• Senior Behavioral Round: Project Deep Dive, Mentoring, Trade-offs and DisagreementMedium

  A senior-level behavioral round covering four themes: a project deep dive, mentoring another engineer, a significant technical trade-off, and a disagreement with a colleague or manager. It tests ownership, depth on decisions, influence without authority and honest reflection on outcomes.

  InstacartSoftware EngineerBehavioral & LeadershipOnsite
• Shopping Cart Totals with Best-Offer Discounts and Aisle Ordering, Frozen Items LastMedium

  A practical coding exercise that parses shopping-cart item records and reports the total item count and price, then adds percentage discounts and buy-N-get-M-free offers, applying the cheapest offer per product. A final part orders items by aisle with frozen items last, testing parsing, exact money arithmetic and extensible code.

  InstacartSoftware EngineerSoftware Engineering FundamentalsTechnical Screen
• Simulate bus boarding with priority and wheelchairsMedium

  This question evaluates queue and priority handling, stable ordering, capacity accounting, constraint handling for wheelchair riders, and the ability to design unit tests and articulate trade-offs within the Software Engineering Fundamentals category.

  InstacartSoftware EngineerSoftware Engineering FundamentalsTechnical Screen
• Solve Two Sorted-Array TasksHard

  This problem tests your ability to efficiently merge and find elements in sorted arrays, focusing on optimal time complexity and edge case handling.

  InstacartMachine Learning EngineerCoding & AlgorithmsTechnical Screen
• Solve bank, password, expression algorithm tasksMedium

  This interview question evaluates algorithm design, data structures, correctness, complexity, edge cases, and implementation details in a realistic interview setting. A strong answer for Solve bank, password, expression algorithm tasks states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.

  InstacartSoftware EngineerCoding & AlgorithmsOnsite
• Solve expression evaluator and string decoderMedium

  This question evaluates a candidate's ability in parsing, expression evaluation, and nested string decoding, including handling malformed input, character encoding nuances, and large-file streaming considerations.

  InstacartSoftware EngineerCoding & AlgorithmsOnsite
• Specify the Lowest Price Across Percentage and Buy-X-Get-Y DiscountsMedium

  Clarify percentage and buy-x-get-y pricing rules, then reason about the cheapest legal discount combination, quantity thresholds, interactions, and rounding.

  InstacartSoftware EngineerSoftware Engineering FundamentalsOnsite
• Troubleshoot a production incident end-to-endHard

  Troubleshoot a production incident end-to-end evaluates requirements, scale assumptions, API/data design, architecture, trade-offs, failure modes, and rollout in a realistic interview setting. A strong answer states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.

  InstacartSoftware EngineerSystem DesignOnsite
• Write SQL to rank advertisers and profitabilityMedium

  This question evaluates a candidate's ability to perform ANSI SQL data transformations including unpivoting denormalized tables, aggregations, joins, and financial metric calculations such as net profit and profit margin while handling nulls and tie-breaking rules.

  InstacartData ScientistData Manipulation (SQL/Python)Technical Screen