Computer & Information Sciences
Computer Science Challenges
Real computer-science projects on Ewance — put algorithms, data structures, and systems thinking to work on real-world problems. Solve them to build a portfolio of verified, recruiter-checkable proof you can do the work — not just describe it.
Recommended challenges
- CodeBeginnerNew
Real-Time Data Visualization Dashboard for an IoT Fleet
Build a deck.gl scatterplot layer rendering 38,000 turbine positions on a map base layer. Color-code by status (operational / degraded / offline) updating from a WebSocket strea…
- Webgl
- Gpu Pipeline
- Data Visualization
Introduction to Computer Graphics - CodeIntermediateNew
Dynamic Programming for an IoT Battery Allocator
Read the device spec (32 KB RAM, 200 mAh daily budget, 9 sensing modes with mAh cost and farmer-value scores) and formulate the daily allocation as a 0/1 knapsack DP (dynamic pr…
- Dynamic Programming
- Algorithm Analysis
- C Programming
Algorithm Design and Analysis - ResearchSeniorNew
Approximation Algorithm for an SRE On-Call Roster
Formulate the roster as a constrained multi-week assignment problem. Show it's NP-hard via reduction. Design a deterministic constant-factor approximation (likely candidate: an …
- Approximation Algorithms
- Linear Programming
- Np Completeness
Advanced Algorithms - CodeBeginnerNew
AR Try-On Web Experience for a Mid-Cap Eyewear Retailer
Build a Three.js + MediaPipe Face Mesh prototype that runs in a mobile browser (Safari 17+ and Chrome 119+). Load 12 frame SKUs as glb (Graphics Language Transmission Format Bin…
- Ar Development
- Webxr
- 3d Interaction
Virtual and Mixed Reality Practice your coursework on real scenarios.
Every challenge is shaped from real-world context — not generic exercises. The work mirrors what your degree prepares you for.
Why Ewance
- ResearchSeniorNew
Behavior-Change Design for a Smoking-Cessation Companion App
Audit the current daily loop and map every screen to BCTs from Michie's v1 taxonomy (93 techniques). Identify gaps (likely: weak self-monitoring, missing implementation intentio…
- Behavior Change Design
- Hci Research Methods
- Interaction Design
Advanced Human-Computer Interaction - CodeIntermediateNew
Bloom Filter Cache to Cut Origin Load at a CDN Edge
Given a target false-positive rate of 1 percent at 200 million keys per shard, compute the optimal bit-array size (m) and hash-function count (k) using the canonical formulas. I…
- Bloom Filters
- Probabilistic Data Structures
- Hash Functions
Randomized Algorithms - ResearchBeginnerNew
NP-Completeness Investigation of a Scheduling Feature Request
Read the feature spec (around 30 vets per clinic, around 10 rooms, around 200 appointments per day, vet-skill constraints, room-equipment constraints, customer-time preferences)…
- Np Completeness
- Complexity Theory
- Algorithm Analysis
Algorithm Design and Analysis - ResearchIntermediateNew
Run a Perceptual Study on Color Scales for a Climate Risk Map
Design a remote study (Prolific or similar, 60 participants screened for normal color vision via Ishihara plates online) with 3 task types: (1) value estimation, (2) anomaly det…
- Perceptual Study
- Color Scales
- Experimental Design
Information and Data Visualization - Browse challenges
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Ship product that solves real user problems. Combine user research, prototyping, and stakeholder alignment to turn ambiguous briefs into measurable wins — the role at the centre of modern software teams.
- CodeIntermediateNew
Randomized Sketch Algorithm for Stream Cardinality
Read the HLL paper (Flajolet et al., 2007) and a sample of 30 minutes of customer trace IDs (around 80M events). Implement HLL from scratch in Go (no library imports). Run bench…
- Randomized Algorithms
- Sketching
- Algorithm Analysis
Advanced Algorithms - CodeSeniorNew
HyperLogLog Cardinality for Real-Time Ad-Auction Analytics
Implement HyperLogLog with precision parameter p in {12, 14, 16} (4KB, 16KB, 64KB sketches) and benchmark relative error on a replayed 3-hour production trace (around 13 billion…
- Hyperloglog
- Probabilistic Data Structures
- Streaming Systems
Randomized Algorithms - ResearchSeniorNew
Cross-Cultural Redesign of a Microfinance App for 4 Markets
Run remote contextual inquiry with 4 users each in Kenya + Indonesia (8 sessions total via local interpreters). Conduct expert reviews with native designers for Philippines + In…
- Cross Cultural Design
- User Research
- Contextual Inquiry
Advanced Human-Computer Interaction - AnalysisBeginnerNew
Choose a Hash Table vs Trie for a URL-Shortener Cache
Implement (1) a hash-table cache with linear probing and (2) a compressed trie cache, both with the same eviction policy (LRU). Measure (a) p50/p99 lookup latency, (b) memory fo…
- Hash Tables
- Trie Data Structure
- Benchmarking
Data Structures Build a verifiable portfolio.
Submissions become evidence. Reviewers with shipping experience score against a rubric; the result becomes a credential anyone can verify.
Why Ewance
- DesignIntermediateNew
Design an Adaptive UI for a Streaming-Platform Recommender
Design 3 adaptive layout variants triggered by session-intent signals (time of day, last-3-session pattern, device class) — without retraining the recommender. Build a high-fide…
- Adaptive Interfaces
- Interaction Design
- A/B Testing
Advanced Human-Computer Interaction - StrategyBeginnerNew
Design Critique Process for a Growth Design Team
Design a 60-minute weekly design-critique format covering: pre-read window, presenter prep template, time-boxed feedback rounds (start-stop-continue or 'I like, I wish, I wonder…
- Design Critique
- Facilitation
- Design Systems
User Interface Design and Prototyping - AnalysisBeginnerNew
Model a City Bike-Share Network as a Graph for Rebalancing
Build a directed weighted graph with stations as nodes and edges as aggregated trip volume over rolling windows. Compute (a) betweenness centrality to find high-traffic stations…
- Graphs
- Networkx
- Shortest Path
Data Structures - DesignIntermediateNew
Author a Scrollytelling Narrative on a Programmatic-Advertising Anomaly
Read the analytics team's internal report on the 3-week anomaly. Design a 7-section scrollytelling narrative using Segel-and-Heer's genre taxonomy (e.g. interactive slideshow + …
- Narrative Visualization
- Scrollytelling
- Svelte
Information and Data Visualization - CodeBeginnerNew
Build a Software Rasterizer for a Teaching Engine
Implement a software rasterizer in C++: vector and matrix math (3D and 4D), model/view/projection transforms, viewport mapping, triangle setup, edge-function rasterization with …
- Rasterization
- Geometric Transformations
- 3d Rendering
Introduction to Computer Graphics - DesignBeginnerNew
Design-System Component Library in Figma for a Travel Brand
Audit the existing app across the 7 squads to inventory every variant of each component (screenshot grid). For the 12 priority components, design canonical variants using Figma …
- Design Systems
- Figma
- Component Libraries
User Interface Design and Prototyping - CodeFoundationalNew
Optimize a Slow Search Function for a Recipe Marketplace
Receive the current Python function (nested loop over (recipe_title, ingredient_list) pairs), the 400k-row dataset (CSV), and 20 representative queries. Step 1: write up the cur…
- Algorithm Analysis
- Big O
- Functions & Data Structures
Algorithm Design and Analysis - CodeSeniorNew
Design a Lock-Free Concurrent Skip List for a Time-Series Database
Implement Fraser's lock-free skip list in Rust with marked pointers for logical deletion. Validate under loom for all interleavings up to 4 threads (or use shuttle if loom can't…
- Lock Free
- Concurrent Data Structures
- Rust Programming
Parallel and Distributed Algorithms - CodeIntermediateNew
Reservoir Sampling for a Privacy-Preserving Telemetry Pipeline
Implement Vitter's Algorithm R (and the faster Algorithm L for bonus credit) producing a 90M-event uniform sample per day from a stream of 18B. Add per-key stratification (so lo…
- Reservoir Sampling
- Randomized Algorithms
- Streaming Systems
Randomized Algorithms - CodeBeginnerNew
Build a Mobile AR Furniture Preview App
Build a SwiftUI + ARKit (or Kotlin + ARCore) experience: detect a horizontal floor plane, place a USDZ (iOS) or glTF (Android) model from the catalog, support pinch-to-rotate an…
- Augmented Reality
- 3d Rendering
- Mobile Development
Introduction to Computer Graphics - CodeSeniorNew
Digital Human Avatar Pipeline for a Conferencing Product
Build a Python pipeline: face detection + landmark extraction, FLAME (or equivalent) face-model fitting to landmarks + photometric loss, texture inference, and skinning weight a…
- Digital Humans
- Geometry Processing
- 3d Rendering
Advanced Computer Graphics - AnalysisIntermediateNew
Accessibility Audit and Remediation Plan for a B2B SaaS Dashboard
Run an automated audit (axe DevTools + Lighthouse) plus manual testing with NVDA screen reader + keyboard-only navigation across 12 dashboard pages. For each failure, classify b…
- Accessibility (Wcag 2.2)
- Wcag Audit
- Usability Evaluation
Human-Computer Interaction
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From brief to credential, in six steps.
Step 01
Browse challenges aligned to your studies.
Step 02
Accept the one that fits your goals.
Step 03
Work through it with AI Copilot guidance.
Step 04
Submit for structured evaluation.
Step 05
Earn a verified credential.
Step 06
Add it to LinkedIn with one click.
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