DM
All learning areas
Build

Project Blueprints

Portfolio and learning projects that grow from fundamentals to production thinking.

Topic library

Developer portfolioTask managerE-commerce applicationReal-time chatExpense trackerAppointment systemSaaS subscription appMobile applicationAnalytics dashboardDeveloper API

Featured guides

Practical starting points for the highest-value topics.

Task manager

A project that can grow with the developer instead of being rebuilt.

  1. Junior: CRUD tasks, validation, responsive UI, authentication, tests, and deployment.
  2. Mid: teams, roles, filters, cursor pagination, audit history, jobs, and observability.
  3. Senior: tenant isolation, SLOs, data migration, rate limits, threat model, and rollout plan.
  4. Document architecture, decisions, API contracts, and known trade-offs.
  5. Measure at least one user or system outcome.

Key idea: Depth and operational quality are more valuable than another shallow project.

Appointment system

Practice concurrency, time, notifications, and sensitive workflows.

  1. Model providers, availability, time zones, appointments, and cancellation policy.
  2. Prevent double booking with a database constraint or transactional lock.
  3. Send idempotent reminders and safely process provider callbacks.
  4. Protect personal information and record meaningful audit events.
  5. Test daylight-saving transitions, concurrent requests, and provider failure.

Key idea: Business invariants belong in the data and service design.

SaaS subscription app

Combine product flows with payments and operational concerns.

  1. Build tenant onboarding, roles, plans, and server-enforced entitlements.
  2. Use hosted checkout and verified, idempotent payment webhooks.
  3. Model trial, active, past-due, canceled, and recovery states.
  4. Add usage limits, audit logs, support tooling, and account deletion.
  5. Create dashboards for activation, payment failure, and system health.

Key idea: Billing state is asynchronous; redirects are not authoritative.