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Step 02
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Every submission is evaluated across 7 engineering dimensions. Not a pass/fail. A detailed architectural breakdown of where you stand.
Stealth Fintech Startup
Code Quality
Design Quality
Feedback
Solid reconciliation service with clean domain separation and a well-thought-out gateway adapter pattern. Testing covers core flows but lacks coverage for partial failure and concurrent processing scenarios that would surface in production.
Strengths
Areas for Improvement
Key Issues
src/adapters/StripeAdapter.ts:61, PayPalAdapter.ts:44, SquareAdapter.ts:52
→ Extract into shared withRetry() middleware with configurable exponential backoff and jitter.
At production payment companies, retry middleware is shared infrastructure. Duplicated retry logic drifts silently when one handler is updated.
tests/adapters/
→ Add integration tests simulating partial gateway failures mid-batch. Verify completed transactions survive.
Payment systems require exhaustive failure-mode testing. Partial batch failures are the production norm.
src/handlers/BatchProcessor.ts:12–14
→ Accept adapters via constructor injection for testability and zero-downtime provider rotation.
Dependency injection is how production payment systems add new gateways without modifying handler code.
Real engineering problems from real companies. Pick one and start building.
Stealth Fintech Startup
Design a service that reconciles payment records across multiple gateway providers and flags discrepancies in real time.
Series A SaaS Company
Build a notification system that supports email, SMS, and in-app channels with per-tenant rate limiting and delivery tracking.
B2B Logistics Platform
Create an API that calculates optimal delivery routes given a set of waypoints, time windows, and vehicle constraints.
Every build you complete adds to a profile that companies actually search. Not a resume. Not a certificate. Proof.
Based on 7 completed builds
Payment Reconciliation Service
Stealth Fintech Startup
Top 18%
Multi-Tenant Notification Engine
Series A SaaS Company
Top 9%
Route Optimization API
B2B Logistics Platform
Top 32%
Real-Time Chat Backend
EdTech Scale-Up
Top 12%
Inventory Sync Pipeline
D2C E-Commerce Startup
Top 22%
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