Data Sciences Challenges
Explore data science challenges on Ewance to build skills employers expect from analysts and ML engineers. Work through challenges on data cleaning, exploratory analysis, modeling, and storytelling with data.
Most Popular
- CodeSeniorNew
Auto-Tune a Distributed Training Cluster's Throughput
Pick a representative fine-tune job (an open 7B model on a public instruction dataset is fine). Define the search space: NCCL_ALGO, NCCL_PROTO, num_workers, prefetch_factor, gra…
- Distributed Training
- Hyperparameter Tuning
- Nccl
Machine Learning Systems - CodeSeniorNew
Coordinate a Fleet of Warehouse Robots
Implement a simulated warehouse grid with 80 robots solving a pick-and-deliver workload. Design a decentralized coordination protocol (recommend a contract-net or auction-based …
- Multi Agent Coordination
- Decentralized Algorithms
- Simulation
Open coursework - ResearchSeniorNew
Compare RNN vs Transformer for Long-Sequence Modeling
Pick a public trajectory dataset (e.g., Argoverse 2, Waymo Open, or ETH-UCY). Implement three models with comparable parameter counts (around 5M each): an LSTM baseline, a vanil…
- Transformers
- Rnn
- State Space Models
Open coursework - ResearchSeniorNew
Audit a Production Model for Membership Inference Attacks
Use a black-box membership inference attack (e.g., the LiRA or shadow-model attack). You have query access to a sandboxed copy of the model + the original training data labels f…
- Membership Inference
- Privacy Attacks
- Model Evaluation
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Each challenge names the skills it strengthens. Over time, your profile fills with the competences a hiring manager would actually look for.
Why Ewance
- ResearchSeniorNew
Structure Learning for a Causal Network in Fintech Risk
You receive the 60-signal dataset and a short interview summary of risk analysts' beliefs about which signals influence which. Use a hill-climbing structure-learning algorithm w…
- Structure Learning
- Bayesian Networks
- Causal Modeling
Open coursework - ResearchSeniorNew
Probabilistic Numerics for an ODE-Constrained Battery Model
You receive 12 months of charge/discharge cycle data for 50 battery packs from a delivery-van fleet, plus the existing single-particle ODE degradation model (Python). Use a prob…
- Probabilistic Numerics
- Bayesian Inference
- Ode Modeling
Open coursework - AnalysisSeniorNew
Cost-Quality Prompt Optimization at Scale
You receive 2,000 labeled code snippets (human rater consensus score 1-5) and budget for at most 8,000 API calls across the optimization run. Run a factorial sweep of 3 prompt s…
- Prompt Optimization
- Cost Quality Tradeoff
- Experiment Design
Open coursework - CodeSeniorNew
Multilingual RAG for a European Customer-Support Knowledge Base
You receive 6,000 documents in 4 languages (mix of FAQs, parts catalogs, repair procedures) plus 120 labeled queries (30 per language) with gold source documents. Build a multil…
- Multilingual RAG
- Cross Lingual Retrieval
- Multilingual Embeddings
Open coursework - Browse challenges
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Pricing Strategist
Set the price that captures value without leaving sales on the table. Demand modelling, willingness-to-pay research, and the disciplined experimentation that turns pricing into a competitive advantage.
- CodeSeniorNew
Offline RL for Robot-Arm Skill Reuse
You receive 5,000 logged trajectories (state, action, reward, next-state) across 12 tasks, with 9 tasks for training and 3 held out. Train an offline RL algorithm (CQL or IQL re…
- Offline Rl
- Conservative Q Learning
- Skill Reuse
Robot Learning - ResearchSeniorNew
Benchmark Conformal Prediction for a Healthcare Risk-Score
You receive a labeled dataset of about 25,000 patient encounters with the current risk-score's predictions and ground-truth 1-year outcomes. Implement and compare split conforma…
- Conformal Prediction
- Uncertainty Quantification
- Calibration
Statistical Machine Learning - ResearchSeniorNew
Multi-Tenant Vector Isolation for a B2B Knowledge Assistant
Build a small proof-of-concept in your chosen vector store (Pinecone or Qdrant — pick one and justify) that supports 10 simulated tenants with 1,000 vectors each. Implement the …
- Multi Tenant Isolation
- Vector Databases
- Threat Modeling
Open coursework - AnalysisSeniorNew
Real Options Analysis for Ørsted Offshore Wind Expansion
Construct a base-case DCF for a 1.1 GW US offshore wind project using public assumptions on capex/MW, capacity factor, and PPA pricing. Then layer a real options framework: mode…
- Real Options
- Monte Carlo Simulation
- DCF Modeling
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Why Ewance
- AnalysisSeniorNew
Founder Behavior Diagnostic and 90-Day Plan for a Burnt-Out SaaS CEO
Your task is to read the case file and produce a behavioral diagnostic plus a 90-day intervention plan that the board chair can hand directly to the founder. Examine the de-iden…
- Founder Psychology
- Behavioral Diagnostics
- Executive Coaching
Open coursework - AnalysisSeniorNew
Investigate Coffee-Price and Euro Risk for a Vietnamese Exporter
Investigate using only the materials provided. First, observe the real market: track how the Intercontinental Exchange (ICE) robusta coffee futures settlement price and the euro…
- IFRS 9
- Hedge Accounting
- Derivatives
Open coursework - AnalysisSeniorNew
Assess Partnership Risk for WellsTrade's Instant Payments Launch
Using the PayFlow due-diligence data room and the eighteen-month PayFlow operational metrics dataset, identify and quantify the operational, security, compliance, and reputation…
- Operational Risk
- Vendor Risk
- Cybersecurity
Open coursework - ResearchSeniorNew
Experimental Design for a Fintech App's Savings Nudge
You are a behavioral data scientist at SaveSmart. Design a randomized controlled trial (RCT) to test the effect of a 'future self' nudge on savings behavior. Define treatment an…
- Experimental Design
- Statistical Analysis
- Nudge Theory
Behavioral Economics - CodeSeniorNew
Real-Time Sentiment Analysis for a Sustainable Fashion Brand
You are to develop a real-time sentiment analysis system for EcoWear. Ingest data from Twitter API (hashtag #EcoWear) and a mock review API, process using Spark Streaming with M…
- Spark Streaming
- Mapreduce
- Nosql
Big Data and Cloud Technologies - AnalysisSeniorNew
Audit a Decentralized Lending Protocol for Smart Contract Vulnerabilities
Working only from the provided lending protocol contract module — which contains LendFlow's core deposit-and-borrow pool together with a simplified price oracle it depends on — …
- Solidity
- Smart Contract Auditing
- Decentralized Finance
Open coursework - StrategySeniorNew
Design a Circular Business Model for EcoWear
Acting as EcoWear's business model innovation analyst, examine the EcoWear company file, the customer behavior dataset, the operations brief, and the circular economy industry r…
- Circular Economy
- Business Model Canvas
- Financial Modeling
Open coursework - AnalysisSeniorNew
Structuring a German-Danish Offshore Wind Joint Venture
Working only from the de-identified deal file (deal-file), the written client instructions (client-instructions), and the two official statutory sources for German and Danish co…
- Cross Border Jv
- Partnership Law
- Corporate Law
Open coursework - StrategySeniorNew
Investigate Germany's Market for EcoThreads' Entry
Your task is to investigate the German sustainable fashion market and produce a recommended entry strategy for EcoThreads. Start from the company facts in the EcoThreads briefin…
- Market Entry
- Competitive Analysis
- Regulatory Analysis
Open coursework - ResearchSeniorNew
Neuromarketing Audit for a Sustainable Fashion Retailer
Your team will design and simulate a neuromarketing experiment. First, propose two alternative store layouts (e.g., circular vs. grid) and two website homepage designs (e.g., he…
- Neuromarketing
- Experimental Design
- Eye Tracking Analysis
Consumer Behavior - AnalysisSeniorNew
M&A Strategy: Should Precision Parts Acquire MicroGears?
Using the financial-data workbook and the industry benchmarks memo provided, value MicroGears Ltd. two ways — a discounted-cash-flow analysis and a comparable-transactions analy…
- Mergers And Acquisitions
- DCF Valuation
- Synergy Estimation
Open coursework - DesignSeniorNew
Designing a Data Warehouse for a Renewable Energy Firm
You are given sample data from three sources: energy production logs, weather data, and equipment maintenance records. Your task is to: (1) design a star schema with fact and di…
- Data Warehousing
- Star Schema
- Etl
Database Systems
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Accept the one that fits your goals.
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