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
- CodeIntermediateNew
Index a Genomics Dataset with a Suffix Array for Read Matching
Implement a suffix array over a 720 MB DNA sequence (4-character alphabet) using DC3 (Difference Cover modulo 3) or SA-IS construction in Rust. Build pattern-matching utilities …
- Suffix Arrays
- String Algorithms
- Rust
Data Structures - 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
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 - CodeBeginnerNew
Shortest-Path Routing for a Bike-Share Operator
Receive the graph (nodes with lat/lon/elevation, edges with length and slope) and 50 origin-destination test pairs. Implement Dijkstra's algorithm with a custom edge-weight func…
- Graph Algorithms
- Dijkstra
- Algorithm Analysis
Algorithm Design and Analysis 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
- DesignIntermediateNew
Design a Multi-Persona Dashboard for a Smart-Building Platform
Run 6 stakeholder interviews (2 per persona) to define jobs-to-be-done per role. Design 3 entry views with persona-specific information hierarchy and a shared component library …
- User Centered Design
- Interaction Design
- Persona Design
Human-Computer Interaction - 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 - CodeIntermediateNew
Build an Accessibility-First Visualization Component Library
Build a React + TypeScript component library exporting 4 chart components. Each component must: (a) be navigable by keyboard, (b) expose data via accessible name + ARIA descript…
- Accessibility
- Wcag 2
- React
Information and Data Visualization - 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 - Browse challenges
Explore role
Product Manager
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.
- 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 - 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 - DesignIntermediateNew
Design a Voice-First Interaction for a Hands-Free Warehouse App
Spend half a day shadowing pickers at a partner warehouse (NDA pre-signed). Map the picking workflow and identify the 8 highest-frequency interactions that should go voice-first…
- Interaction Design
- Voice Ui Design
- Contextual Inquiry
Human-Computer Interaction - CodeIntermediateNew
Implement Shadow Mapping in a Toy Game Engine
Add a directional-shadow-map render pass to the engine: render the scene depth from the light's perspective into a 2K depth texture, then sample it during the main pass to atten…
- Shading And Lighting
- Gpu Pipeline
- Shadow Mapping
Introduction to Computer Graphics 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
Intelligent Interface Spec for an AI-Assisted Code Review Tool
Audit current AI-surface inconsistencies and map every AI signal to a confidence band (high / medium / speculative / unverified). Design a unified intelligent-interface spec: su…
- Intelligent Interfaces
- Interaction Design
- Hci Research Methods
Advanced Human-Computer Interaction - CodeSeniorNew
Design a Raft-Based Consensus Layer for a Multi-Region Database
Implement Raft in Go per the original Ongaro-Ousterhout paper: leader election, log replication with the safety property, snapshotting at 10K-entry granularity, and joint-consen…
- Distributed Consensus
- Raft
- Fault Tolerance
Parallel and Distributed Algorithms - CodeFoundationalNew
Replace a Naive List with a Heap in a Delivery Dispatcher
Read the current dispatcher source (around 400 lines of Python). Identify the linear scan and the operations that touch it (insert, decrease-key on a re-scored courier, extract-…
- Heap Data Structure
- Complexity Analysis
- Python
Data Structures - 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 - CodeSeniorNew
Multiplayer Mixed-Reality Training for Aircraft Maintenance
Build a Unity-based prototype supporting 3 concurrent users on Magic Leap 2 (or Quest 3 passthrough as fallback) co-located in the same physical room. Implement: shared anchor f…
- Mixed Reality Applications
- Multiplayer Xr
- Shared Anchors
Virtual and Mixed Reality - CodeIntermediateNew
VR Training Simulator for Power-Substation Switching
Receive a real switching procedure (anonymized: 14-step bay isolation), the safety regulation it references, and photos of the live substation bay. Build a Unity 6 + XR Interact…
- Vr Development
- Unity
- Xr Interaction
Virtual and Mixed Reality - DesignBeginnerNew
Redesign a Confusing Onboarding Flow for a Habit-Tracker App
Run a heuristic evaluation against Nielsen's 10 heuristics on the current 4-screen flow. Recruit 5 participants from the target persona (millennials in self-improvement habits) …
- User Centered Design
- Usability Testing
- Heuristic Evaluation
Human-Computer Interaction - 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 - 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 - DesignIntermediateNew
Prototype an Embedded Dashboard for an EV Charger
Define the 3 user modes (driver: 4 screens, operator: 5 screens, technician: 3 screens) and their entry conditions (NFC card type, PIN, technician key). Build a 12-screen protot…
- Embedded Ui
- Figma
- Framer
User Interface Design and Prototyping - 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 - CodeSeniorNew
Physically-Based Path Tracer for a Product Visualization Studio
Build a path tracer in C++ with: ray-triangle and ray-sphere intersection on a BVH (bounding volume hierarchy), Lambertian diffuse and Cook-Torrance GGX specular BRDFs, multiple…
- Physically Based Rendering
- Path Tracing
- Shading And Lighting
Advanced Computer Graphics
How it works
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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