System Design

⏱ 6 min read Core Entities Issue: issue_id, project_id, title, description (rich text), type (BUG, FEATURE, TASK, EPIC), status, priority (P0-P3), assignee_id, reporter_id, parent_issue_id […] Read article

⏱ 6 min read ML Platform Architecture Overview An ML platform has three distinct phases: Feature Engineering — transform raw data into model-ready features Read article

⏱ 6 min read Core Entities Account: account_id, user_id, account_type (CASH, MARGIN), buying_power, portfolio_value, status. Order: order_id, account_id, symbol, side (BUY/SELL), type (MARKET, LIMIT, Read article

⏱ 7 min read Core Entities Venue: venue_id, name, address, capacity, type (ARENA, CONFERENCE_CENTER, THEATER, OUTDOOR), facilities (JSON: {parking, catering, av_equipment}), timezone, is_active. Event: Read article

⏱ 6 min read Requirements An A/B testing platform enables product teams to run controlled experiments: show variant A to 50% of users and Read article

⏱ 5 min read What is a Vector Database? A vector database stores high-dimensional numerical vectors (embeddings) and supports efficient similarity search: “find the Read article

⏱ 5 min read Core Entities Customer: customer_id, first_name, last_name, email, phone, date_of_birth, ssn_hash, kyc_status (PENDING, VERIFIED, REJECTED), address, created_at. Account: account_id, customer_id, account_number Read article

⏱ 5 min read Core Entities Product: product_id, name, description, type (SAAS, MEDIA, PHYSICAL). Plan: plan_id, product_id, name, billing_period (MONTHLY, QUARTERLY, ANNUAL), price, currency, Read article

⏱ 5 min read Core Entities Provider: provider_id, user_id, name, type (DOCTOR, CONSULTANT, TRAINER, THERAPIST), timezone, bio, photo_url, is_active. Service: service_id, provider_id, name, duration_minutes, Read article

⏱ 6 min read Requirements A drone delivery platform dispatches autonomous drones to deliver packages from warehouses or stores to customer addresses. Core challenges: Read article

⏱ 6 min read Core Entities Book: book_id, isbn, title, authors (array), publisher, published_year, genre, language, description, cover_url. BookCopy: copy_id, book_id, library_id, condition (NEW, Read article

⏱ 6 min read Requirements An IoT data platform ingests telemetry from millions of connected devices — sensors, smart meters, industrial equipment, wearables — Read article

⏱ 6 min read Core Entities ParkingLot: lot_id, name, address, total_floors, total_spaces, open_time, close_time, timezone. ParkingFloor: floor_id, lot_id, floor_number, total_spaces, available_spaces. ParkingSpace: space_id, floor_id, Read article

⏱ 4 min read Core Entities Member: member_id, user_id, first_name, last_name, email, phone, photo_url, join_date, status (ACTIVE, SUSPENDED, CANCELLED, FROZEN), emergency_contact. MembershipPlan: plan_id, name Read article

⏱ 5 min read Requirements An analytics dashboard lets users visualize business metrics: revenue over time, active users, conversion rates, funnel analysis, A/B test Read article