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Real-world challenges across Engineering & Technology. Pick the specific field you're studying, solve an actual brief, and walk away with verified, portable proof recruiters can confirm in one click.
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Recommended challenges
- AnalysisIntermediateNew
Audit and Govern a Frankfurt Bank's Sprawling API Estate
Working only from the materials provided, examine the API estate and reach a defensible governance judgment. Read the situation record (estate-situation-file) to understand how …
- API Governance
- Openapi Spec
- Dora Compliance
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
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- DesignIntermediateNew
Design Schema Evolution for a Multi-Tenant Event Platform
Design a schema-evolution model covering: schema-registry topology (per-tenant subjects vs shared), compatibility modes per topic class (strict vs forward-only vs none), tenant-…
- Schema Evolution
- Kafka
- Schema Registry
Event-Driven Architecture - 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 - AnalysisIntermediateNew
Open-Source License Audit and 60-Day Remediation Plan for Lumen Observability
Work only from the four items in provided_materials. Start with the dependency inventory (the 'Lumen dependency inventory' dataset), which lists every open-source package, its d…
- Oss Licensing
- Sbom
- Supply Chain
Open coursework - DesignIntermediateNew
Design an Upstream Contribution to a CNCF Service-Mesh Project
Using the internal fork dossier (case-file) for the business context, the prior rejection feedback, and the targeted roadmap area, design an upstream contribution that a careful…
- Oss Contribution
- Rfc Design
- Pr Etiquette
Open coursework - Browse challenges
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Strategy Analyst
Frame the business question, model the options, build the recommendation. From market sizing to competitive analysis, this role is where strategy consulting meets in-house decision-making.
- DesignBeginnerNew
Design a Sustainable Governance Model for a Burnt-Out Open-Source Project
Working only from the provided materials — the Project Health Snapshot (m1), the issue-and-contribution activity log (m2), the anonymized community chat excerpts (m3), and the f…
- Governance Models
- Maintainership
- Issue Triage
Open coursework - DesignIntermediateNew
Design a SLSA-Aligned, Signed Release Pipeline for an Apache Project
Working only from the materials provided—the project dossier, the current release-pipeline module, the SLSA v1.0 specification, the slsa-github-generator project, the Sigstore d…
- Supply Chain
- Slsa
- Sigstore
Open coursework - CodeBeginnerNew
Issue Triage Bot for a Popular Eclipse Foundation Project
Read the project's existing labels, issue templates, and last 800 issues. Build a Go (or Python) GitHub Action that runs on issue_opened and issue_edited events. Implement heuri…
- Issue Triage
- Oss Contribution
- Github Actions
Open coursework - CodeIntermediateNew
Apply the Mikado Method to Untangle a Tax-Engine Class
Starting from the live codebase (Java 17, 73 percent line coverage), write a failing test that asserts the desired end state ('TaxCalculator is decomposed into per-country strat…
- Mikado Method
- Refactoring
- Strategy Pattern
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Why Ewance
- CodeBeginnerNew
Characterization Tests for an Untested Pricing Engine
Drive the pricing engine with around 800 representative input vectors generated from anonymized production quotes (provided). For each vector, capture the current output as the …
- Characterization Tests
- Approval Testing
- Legacy Code
Refactoring and Code Smell Detection - CodeIntermediateNew
Strangler-Fig Migration of a Monolithic Order Service
Stand up an HTTP facade in front of the monolith (Nginx or a small Go proxy) that routes by URL pattern. Slice 1: extract the order-status read endpoint, dual-write nothing, rou…
- Strangler Fig Pattern
- Refactoring
- Legacy Modernization
Refactoring and Code Smell Detection - AnalysisBeginnerNew
Code-Smell Triage Workshop for a Hiring-Platform Backend
Run static analysis (SonarQube + a custom ruleset for domain-specific smells) on the four most-touched services. Score each smell on the 22-item Fowler catalog by occurrence cou…
- Code Smells
- Static Analysis
- Refactoring Prioritization
Open coursework - StrategyBeginnerNew
IDE-Assisted Refactoring Bootcamp for a Junior Backend Team
Design a 5-day curriculum centered on 10 katas chosen for refactoring-pattern coverage (e.g., Gilded Rose for replace-conditional-with-polymorphism, Tennis kata for extract-meth…
- Refactoring
- Katas
- Ide Tooling
Refactoring and Code Smell Detection - ResearchBeginnerNew
Run a Stakeholder Discovery Program for a Hospital Records Replacement
Using the discovery context and stakeholder roster in the case file, design and run a structured program of 38 interviews (45 minutes each) covering the 28 clinicians, 6 technol…
- Stakeholder Analysis
- Requirements Elicitation
- User Interviews
Open coursework - DesignBeginnerNew
Use-Case Specification for a Marketplace Disputes Workflow
Identify 5 primary use cases (e.g., 'Buyer opens dispute within 7-day window', 'Seller counters with evidence', 'Operations escalates to refund'). For each: actors, precondition…
- Use Cases
- Cockburn Template
- Requirements Specification
Open coursework - CodeSeniorNew
Formally Specify and Model-Check a Payment Rate-Limit Service in TLA+
Using the incident record (INCIDENT-FILE), the protocol design note (PROTOCOL-NOTE), and the representative coordinator module (COORDINATOR-MODULE) provided to you, write a TLA+…
- Tla Plus
- Formal Specification
- Model Checking
Open coursework - DesignBeginnerNew
Validate a Signed Construction-Permits Requirements Document
Using the requirements excerpt (req-doc-excerpt), the anonymized permits dataset (permits-dataset), and the intake notes from the first case-handler session (intake-notes), conv…
- Requirements Validation
- Executable Scenarios
- Gherkin
Open coursework - StrategyIntermediateNew
Rebuild a Bank's Requirements Baseline for Audit Defense
Working only from the program case file, the current 400-entry requirements spreadsheet, and the auditor's findings note provided to you, produce a judgment and a working baseli…
- Requirements Management
- Traceability
- Governance
Open coursework - AnalysisIntermediateNew
Architecture Evaluation via ATAM for a Healthcare Platform
Run a 2-phase ATAM (Phase 1: present architecture + elicit quality-attribute goals + analyze approaches; Phase 2: broader stakeholder validation). Capture: business drivers, qua…
- Atam
- Architecture Evaluation
- Quality Attributes
Software Architecture - DesignIntermediateNew
Event-Driven Architecture for an Order-to-Cash Pipeline
Design an event-driven architecture using a Kafka-like message bus (anonymized: assume a Kafka-compatible event log). Define: 9 event types with Avro schemas, partition strategy…
- Event Driven Architecture
- Kafka
- Saga Pattern
Software Architecture - StrategyIntermediateNew
Choose Between Microservices and Modular Monolith for a Scale-Up
Audit the codebase: lines of code per Rails engine, deploy frequency, change-coupling between engines (using git co-change analysis), per-engine on-call burden. Survey the 4 squ…
- Architecture Decision
- Team Topologies
- Modular Monolith
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