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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- CodeSeniorNew
Implement a Pipelined RISC-V (RV32I) Core for Automotive Telemetry
Implement a classic 5-stage RV32I pipeline in SystemVerilog. Include data-forwarding from EX/MEM and MEM/WB back to EX, a load-use stall, and branch resolution in EX with a 1-cy…
- Systemverilog
- Risc V
- Pipelining
Digital Systems Design - CodeSeniorNew
Implement Raft Consensus for a Self-Hosted Feature-Flag Service
Implement the core Raft algorithm (leader election, log replication, snapshotting) from the original Ongaro & Ousterhout paper. Use an embedded key-value store (BoltDB or sled) …
- Raft Consensus
- Go Programming
- Grpc
Open coursework - AnalysisSeniorNew
Diagnose Clock Skew in a HFT Order Matching System
Receive anonymized PTP grandmaster + slave logs (nanosecond resolution, 30 days, 3 cabinets) plus a synthetic order-flow generator. Identify the drift pattern (likely candidate:…
- Logical Clocks
- Ptp Time Sync
- Cpp Programming
Open coursework - CodeIntermediateNew
Refactor a Tangled Order Aggregate at a Logistics Platform
Work in the provided Spring Boot 3 + Java 21 codebase. Identify the true aggregate roots (likely candidates: Order, Shipment, Invoice) and split the god object accordingly. Extr…
- Tactical Ddd
- Aggregate Design
- Java Refactoring
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- CodeIntermediateNew
Design an Anti-Corruption Layer for a Legacy Hospital EHR
Map the legacy EHR's HL7 v2 message schema (ADT, ORM, ORU segments) to the new platform's domain (Patient, Encounter, Order, Result). Identify the 6-10 anti-patterns in the lega…
- Anti Corruption Layer
- Hl7 Integration
- Domain Modeling
Domain-Driven Design - CodeIntermediateNew
Apply Hexagonal Architecture to a Payments Microservice
Design the settlement domain in pure Kotlin (no Spring imports, no framework annotations). Define ports for: payment-network adapter (one inbound per network — SEPA, Faster Paym…
- Hexagonal Architecture
- Ports And Adapters
- Kotlin Programming
Domain-Driven Design - CodeIntermediateNew
Port a Drone Flight Controller from Bare-Metal to FreeRTOS
Take the existing bare-metal firmware (STM32H7, around 14,000 lines C). Identify the tasks (control loop 1 kHz, IMU read 2 kHz, GPS 10 Hz, telemetry 50 Hz, command parsing event…
- Freertos
- Rate Monotonic Scheduling
- C Programming
Open coursework - CodeIntermediateNew
Build a Zephyr-Based Sensor Node for Industrial IoT
Set up a Zephyr workspace, configure the device tree for the provided nRF52840 + ADXL355 + custom BLE service. Implement: SPI driver for accelerometer at 4 kHz, on-device 1024-p…
- Zephyr Rtos
- Ble Protocol
- Low Power Design
Embedded Systems Engineering - Browse challenges
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- AnalysisSeniorNew
Diagnose a Hard-Real-Time Failure in an Automotive ECU
Receive anonymized AUTOSAR runnable + task traces (CSV + Vector CANalyzer .blf), 8 hours covering 3 failure events. Identify timing budget per task and runnable. Reproduce on th…
- Autosar
- Real Time Debugging
- Can Bus Analysis
Open coursework - DesignBeginnerNew
Build a PlatformIO CI Pipeline for a Multi-Board Firmware Team
Use GitHub Actions + PlatformIO. Build matrix across the 6 boards. Run native unit tests + QEMU-based emulation tests for boards that QEMU supports. Set up a self-hosted runner …
- Platformio
- Github Actions
- Embedded Ci
Open coursework - CodeSeniorNew
Implement a Bootloader with Secure OTA for a Medical Wearable
Implement using MCUboot as the secondary-image bootloader. Set up an offline signing pipeline (Ed25519 keys, HSM-backed for production). Implement the OTA client: BLE file trans…
- Mcuboot
- Secure Bootloader
- Firmware Signing
Open coursework - DesignBeginnerNew
Design a Resilient Bridge Between New Commerce and Legacy SAP
Using the integration requirements case file, design how all five interactions move between the storefront and SAP ECC: order create, pricing inquiry, inventory availability, cr…
- Enterprise Integration
- SAP Integration
- Apache Camel
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- StrategyIntermediateNew
Decompose a CRM Monolith into Bounded Services
Analyze the monolith using NDepend or similar (provided). Identify the top 4-6 candidate service boundaries based on coupling + business-capability seams (likely: Quotation, Pol…
- Strangler Fig Pattern
- Service Decomposition
- Csharp Programming
Enterprise and Business Software Engineering - DesignIntermediateNew
Replace Nightly Batch Loads with Near-Real-Time Reporting at a Pump Manufacturer
Using the system inventory in the provided case-file, classify all nine source systems by the most appropriate way to capture their changes: log-based change data capture where …
- Change Data Capture
- Kafka
- Debezium
Open coursework - CodeIntermediateNew
Build a Saga Orchestrator for Cross-Border Payment Creation
Using the service contract specification and the failure scenario catalog provided, model the payment-creation flow as a saga with six forward steps and six compensations, and i…
- Saga Pattern
- Temporal Workflow
- Compensation Logic
Open coursework - CodeIntermediateNew
Design an Event-Sourced Inventory System for a Third-Party Warehouse
Working from the operations case file and the warehouse domain specification, design an event model of twelve to fifteen events that covers the warehouse lifecycle (receive, put…
- Event Sourcing
- Cqrs
- Eventstoredb
Open coursework - CodeIntermediateNew
Bridge a Healthcare Messaging System from RabbitMQ to Kafka
Working from the provided RabbitMQ topology specification and the 30-day message-volume dataset, map each of the 24 queues to a Kafka topic and choose a sound partition key for …
- Kafka
- Rabbitmq
- Message Broker Migration
Open coursework - DesignIntermediateNew
Design a Real-Time Fraud-Scoring Stream for a Card Issuer
Produce a design proposal for a fraud-scoring stream that ingests authorization events, maintains a 30-day rolling feature state per customer, applies a pre-trained scoring mode…
- Apache Flink
- Kafka Streams
- Stream Processing
Open coursework - CodeBeginnerNew
Model a Trading Order Book with Algebraic Data Types in Haskell
Design ADTs for Side (Buy | Sell), OrderType (Limit | Market | StopLimit), Order, Trade, and BookState. Make illegal states unrepresentable (e.g. a Match can never produce a neg…
- Haskell
- Algebraic Data Types
- Property Based Testing
Functional Programming - 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
Build a Readable Rules Language for Insurance Policies in OCaml
Design a small domain-specific language that covers the building blocks of policy rules: variables (insured amount, premium, deductible, named perils), expressions (arithmetic, …
- Ocaml
- Domain Specific Languages
- Parser Combinators
Open coursework - CodeBeginnerNew
Apply Property-Based Testing to a Currency-Conversion Module
Rewrite the conversion module in F#: use units of measure for currency types, immutable value types for amounts, no floating-point arithmetic (Decimal only). Build property test…
- Fsharp
- Property Based Testing
- Fscheck
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
Open coursework 
CodeBeginnerNewBuild PR-Based Environment Promotion for an HVAC SaaS
Using the provided GitOps starter repository sample and the promotion specification, stand up Flux v2 with its image-reflector and image-automation controllers and define semant…
- Flux
- Image Automation
- Github Actions
Open coursework
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