Computer Sciences Challenges
Explore computer science challenges on Ewance to equip yourself with job-relevant skills for a variety of roles. Learn programming techniques and build technical skills with challenges on software development, algorithm design, system architecture, and more.
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- CodeBeginnerNew
Refactor a Node.js Service into Scala with Effect Systems
Take the existing Node.js price-normalization code (provided). Rewrite in Scala 3 using ZIO (or Cats Effect) — model every effect explicitly (IO for side effects, Either or type…
- Scala Programming
- Zio Effects
- Cats Effect
Functional Programming - CodeBeginnerNew
Convert an Imperative Recommendation Service to Pure Functional Style
Take the Python ranking module (around 900 lines). Identify side-effects (DB reads, cache lookups, logging, time) and lift them to the boundary. Rewrite the ranking core in Scal…
- Scala Programming
- Pure Functions
- Functional Core Imperative Shell
Functional Programming - CodeIntermediateNew
Parallelize a CFD Solver with MPI Across 256 Cores
Profile the serial solver to identify the hot loops (likely: pressure-Poisson solve, advection step, BC update). Decompose the domain via 2D block-structured partitioning. Imple…
- Mpi
- Cpp Programming
- Domain Decomposition
High-Performance and Scientific Computing - CodeIntermediateNew
Port a Monte Carlo Engine to CUDA for an Asset Manager
Profile the CPU MC engine to identify the kernel candidates: path generation (Brownian motion + correlated factors), payoff evaluation, aggregation. Port to CUDA: use cuRAND for…
- Cuda
- Monte Carlo
- Gpu Programming
High-Performance and Scientific Computing Develop in-demand professional skills.
Each challenge names the skills it strengthens. Over time, your profile fills with the competences a hiring manager would actually look for.
Why Ewance
- DesignIntermediateNew
Design Parallel I/O for a Climate-Simulation Data Pipeline
Analyze the current I/O pattern: each MPI rank writes its own file via serial HDF5 (the classic anti-pattern). Design a single shared file using parallel HDF5 + MPI-IO with coll…
- Mpi Io
- Parallel Hdf5
- Lustre Filesystem
High-Performance and Scientific Computing - CodeIntermediateNew
Port a Legacy C Image Pipeline from x86 to ARM64
Clone the 12k-line C codebase (provided). Set up an ARM64 cross-compile toolchain (clang or gcc). Identify portability issues: endianness assumptions, pointer-size casts, inline…
- C Programming
- Manual Memory Management
- Pointers
Imperative and Low-Level Programming - CodeSeniorNew
Diagnose Memory Corruption in a Trading-Firm Order Gateway
Read the 8k-line allocator + order-pool code (provided), plus 3 production crash dumps and 14 hours of pre-crash telemetry. Hypothesize root cause (likely candidates: use-after-…
- Cpp Programming
- Manual Memory Management
- Pointers
Imperative and Low-Level Programming - CodeIntermediateNew
Write a Linux Device Driver for a Custom Sensor Board
Read the SPI sensor datasheet (provided) and the existing user-space hack (around 600 lines of C). Write a Linux kernel module (target kernel 6.6 LTS) that registers a hwmon dev…
- C Programming
- Os Interfaces
- Kernel Development
Imperative and Low-Level Programming - 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.
- CodeBeginnerNew
Replace Raw Pointers with Smart Pointers in a Game-Engine Module
Audit the 18k-line module for raw-pointer ownership patterns (owning, borrowing, shared). Refactor in 4 phases: (1) introduce unique_ptr for clearly-owning sites, (2) shared_ptr…
- Cpp Programming
- Manual Memory Management
- Pointers
Imperative and Low-Level Programming - CodeSeniorNew
Build a Bare-Metal Bootloader for a Wearable-Device Prototype
Write a bare-metal C bootloader for the Cortex-M4 target (no operating system, custom linker script, vector-table relocation). Implement: SHA-256 image validation (use a public-…
- C Programming
- Manual Memory Management
- Pointers
Imperative and Low-Level Programming - AnalysisIntermediateNew
Build a Risk Register for a Cross-Border Healthcare Provider
Run 8 structured interviews (CISO, IT director, clinical-systems lead, DPO, 4 clinic managers) to surface the top risk candidates. Map each risk against NIST SP 800-30 (threat s…
- Risk Management
- NIST Sp 800 30
- Security Governance
Information Security Management and Governance - CodeBeginnerNew
Build a Search-Based Logistics Router for a Same-Day Delivery Service
Build a Python service exposing /route that takes (courier_location, list_of_stops, traffic_window) and returns an ordered route. Implement 2 search strategies: A* (with a domai…
- Search Algorithms
- Intelligent Agents
- Python Or Javascript
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- CodeBeginnerNew
Knowledge-Graph Recommender for a Niche Online Bookstore
Model the catalog as a knowledge graph (nodes: books, authors, genres, themes, eras, awards; edges: wrote, in-genre, has-theme, won, similar-to). Use Neo4j or a simple Python in…
- Knowledge Representation
- Knowledge Graphs
- Python Or Javascript
Introduction to Artificial Intelligence (CS Elective) - CodeIntermediateNew
Automated Planner for a Field-Service Maintenance Schedule
Model the scheduling problem as either PDDL (Planning Domain Definition Language) or a constraint-satisfaction problem using a solver like OR-Tools. Define: actions (visit_site,…
- Planning
- Constraint Satisfaction
- Python Or Javascript
Introduction to Artificial Intelligence (CS Elective) - CodeFoundationalNew
Rule-Based Intent Classifier for a Customer-Support Triage Bot
Build a rule-based classifier in Python that runs ordered rules (regex + keyword + simple heuristics) against ticket subject + body. Use a hierarchical rule structure (high-prec…
- Knowledge Representation
- Rule Based Systems
- Python Or Javascript
Introduction to Artificial Intelligence (CS Elective) - CodeBeginnerNew
Intelligent Agent for a Smart-Thermostat Pricing-Aware Schedule
Design an intelligent agent with: perception (read sensor history), basic learning (cluster comfort intervals from 7 days of observations), decision-making (schedule heating to …
- Intelligent Agents
- Basic Learning
- Python Or Javascript
Introduction to Artificial Intelligence (CS Elective) - CodeIntermediateNew
Edge-Inference Pipeline for a Smart-Factory Vibration Monitor
Architect a pipeline that runs on an ESP32-S3 + STM32 combo (provided): (1) sample 3-axis accelerometer at 3.2 kHz, (2) compute windowed FFT features on-device every 1s, (3) run…
- Edge Computing
- Embedded Systems
- Sensors And Actuators
Internet of Things and Cyber-Physical Systems - DesignIntermediateNew
Wireless Sensor-Network Design for a Vineyard Microclimate Study
Spec the network: 60 LoRaWAN sensor nodes + 2 gateways (TheThingsStack indoor + outdoor gateway choice), star topology with possible relays. Node hardware: ESP32 + LoRa + sensor…
- Sensor Networks
- Embedded Systems
- Lorawan
Internet of Things and Cyber-Physical Systems - DesignSeniorNew
OTA Firmware-Update Architecture for a 50,000-Device Smart-Meter Fleet
Design a 4-stage OTA architecture: (1) signed image build + manifest, (2) backend rollout (1 percent canary, 10 percent expand, 50 percent expand, 100 percent), (3) device-side …
- Embedded Systems
- Cyber Physical Systems
- Edge Computing
Internet of Things and Cyber-Physical Systems - DesignIntermediateNew
Real-Time Traffic-Sensor Fusion for a Smart Intersection
Design a fusion architecture: per-modality timestamping (NTP-disciplined within 50ms), per-modality confidence weighting (modality-specific noise model), Kalman-filter or partic…
- Sensor Fusion
- Cyber Physical Systems
- Edge Computing
Internet of Things and Cyber-Physical Systems - AnalysisSeniorNew
Cyber-Physical Security Audit for a Connected-Building HVAC System
Audit one representative tower's BMS: enumerate BACnet devices (network discovery + capability inventory), identify lateral-movement paths (tenant wifi -> guest network -> BACne…
- Cyber Physical Systems
- Ot Security
- Risk Management
Internet of Things and Cyber-Physical Systems - CodeBeginnerNew
Design and Implement a C++ Telemetry Aggregator With Inheritance
Implement a TelemetrySource abstract base class with virtual sample() and timestamp() methods, 6 concrete subclasses (one per sensor family), and a TelemetryBus that polymorphic…
- Systems Language Proficiency (Go, Rust, C++)
- Inheritance
- Polymorphism
Object-Oriented Programming and Design - AnalysisIntermediateNew
OSS License Audit and Remediation Plan for a Series-B Dev-Tools Startup
Receive an SBOM (Software Bill of Materials) from the build pipeline (CycloneDX JSON) for 14 services and 3 SDKs. Run automated classification (Syft + ScanCode or FOSSA), then m…
- Oss Licensing
- Sbom
- Supply Chain Optimization
Open Source Contribution and Maintainership - CodeBeginnerNew
Build a Multi-Level Feedback Queue Scheduler in xv6
Fork the xv6-riscv repository and implement MLFQ in proc.c with 3 priority queues, per-queue time slices (10ms / 20ms / 40ms), priority demotion on slice exhaustion, and a 100ms…
- Operating Systems
- Scheduling
- C Programming
Operating Systems
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