Algorithms & Data Structures 2
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Understands the fundamentals of Algorithms & Complexity at a basic level. Applies simple concepts in work tasks using TypeScript/Python. Follows recommendations from senior developers when solving problems.
Independently applies algorithmic thinking across the stack: selects efficient query algorithms on backend, understands virtual scrolling and pagination algorithms on frontend, evaluates data processing trade-offs between client and server. Analyzes end-to-end complexity of feature implementations.
Designs fullstack application architecture considering algorithmic complexity at all levels: from SQL queries and server logic to client-side component rendering. Optimizes bottlenecks across the entire stack using profiling and benchmarks.
Defines algorithmic efficiency standards for the entire application stack. Shapes a culture of conscious algorithm selection — from database indexes to caching strategies and list virtualization on frontend. Mentors teams on end-to-end optimization.
Understands the fundamentals of Data Structures at a basic level. Applies simple concepts in work tasks using TypeScript/Python. Follows recommendations from senior developers when solving problems.
Independently selects appropriate data structures across the stack: normalized database schemas, API response DTOs, client-side state trees for UI. Understands trade-offs between data format choices for efficient serialization between frontend and backend.
Selects optimal data structures for each fullstack application layer: HashMap for Redis cache, B-trees for PostgreSQL indexes, normalized stores for frontend state. Trains the team on data structure selection principles for specific tasks.
Designs end-to-end data models from database schema to typed API contracts and client-side state structures. Defines serialization and data transformation strategies between layers. Shapes architectural patterns for working with data at organizational scale.
API Protocols 1
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Implements basic WebSocket connections in fullstack applications: subscribing to events with Socket.io on client, handling messages on server. Understands connection lifecycle and displays real-time updates in React/Vue components.
Designs WebSocket communication for fullstack features: rooms and namespaces in Socket.io, reconnection handling on client, server event broadcasting. Implements real-time update patterns: chat, notifications, collaborative editing.
Defines real-time communication strategy for the fullstack platform: WebSocket vs SSE vs polling for different scenarios, pub/sub architecture. Designs scalable infrastructure for real-time features and messaging protocol standards for the team.
Shapes organizational real-time interaction strategy: event-driven architecture from database through backend to UI, CRDT for collaboration, edge WebSocket. Defines platform solutions for real-time at scale and standards for distributed systems.
Authentication & Authorization 1
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Implements basic JWT authentication in fullstack applications: login through form, token storage, sending in API request headers. Understands JWT structure, difference between access and refresh tokens, implements route protection on frontend and backend.
Integrates OAuth 2.0 into fullstack applications: authorization through Google/GitHub, PKCE flow for SPA, callback handling. Implements refresh token rotation, backend session management and frontend authentication state with proper token expiration handling.
Defines authentication strategy for the fullstack platform: centralized identity provider, token management standards, audit logging. Designs authorization architecture with a unified model for frontend and backend, trains the team on security best practices.
Shapes organizational identity strategy: unified authentication platform for fullstack applications, zero-trust architecture, machine-to-machine auth. Defines token management standards, MFA, passwordless auth and creates shared security libraries.
Build Tools & Bundling 1
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Works with Vite in fullstack projects: understands dev server with HMR, basic configuration for React/Vue. Can set up proxy for API requests to backend, import assets and use environment variables for different environments.
Independently implements complex UI components with Vite and modern bundlers. Optimizes rendering performance. Writes tests. Applies for state management.
Designs Vite infrastructure for the fullstack platform: monorepo configuration with shared plugins, SSR pipeline, custom transforms. Defines configuration standards for the team and optimizes DX in fullstack development with a unified build tool.
Defines organizational build tooling strategy: Vite as fullstack project platform, webpack migration, plugin architecture. Contributes to Vite ecosystem, creates internal plugins and templates for scaling fullstack development.
Clean Code & Refactoring 1
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Understands the fundamentals of Code Quality & Refactoring at a basic level. Applies simple concepts in work tasks using TypeScript/Python. Follows recommendations from senior developers when solving problems.
Independently applies code quality practices across frontend and backend. Writes consistent code with shared type definitions and clear API boundaries. Understands trade-offs between DRY code sharing and independent deployability. Reviews full-stack features for proper error propagation and data validation consistency.
Implements unified code quality standards for fullstack projects: shared ESLint config for client and server, pre-commit hooks, automated linting in CI. Configures SonarQube for cross-stack analysis. Conducts architectural reviews focused on stack consistency.
Shapes code quality culture in fullstack organization. Defines codebase health metrics for each layer: test coverage, cyclomatic complexity, duplication. Creates automated quality gates in CI/CD pipeline for the entire monorepo.
Concurrency & Parallelism 1
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Understands the fundamentals of Async Programming at a basic level. Applies simple concepts in work tasks using TypeScript/Python. Follows recommendations from senior developers when solving problems.
Independently applies async programming across the stack: server-side async request handling, client-side async data fetching, WebSocket/SSE for real-time updates. Understands trade-offs between different async patterns on frontend and backend.
Designs end-to-end async flows: from WebSocket connections and SSE on frontend through message queues on backend to async workers. Solves race condition and deadlock problems at all stack levels, implements graceful degradation patterns.
Defines asynchronous interaction strategy for the entire stack: event-driven architecture, reactive streams, CQRS with eventual consistency. Establishes error handling and retry policy standards across all layers. Mentors on complex concurrency scenarios.
CSS & Styling 3
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Uses design system components to build fullstack application UI: buttons, forms, cards from documentation. Follows composition and reuse principles, correctly passes props and applies component variants.
Independently implements complex UI components with design system development. Optimizes rendering performance. Writes tests. Applies for state management.
Designs design system architecture for the fullstack platform: modular package structure, versioning, changelog process. Coordinates frontend developers and designers, defines component APIs and system evolution strategy.
Defines organizational design system strategy: multi-platform support, automated documentation generation, adoption metrics. Designs infrastructure for package publishing and versioning. Mentors leads on creating and scaling design systems.
Applies modern CSS for fullstack application styling: Flexbox and Grid for layouts, CSS variables for theming, media queries for responsiveness. Understands cascade and specificity, builds layouts from designs with pixel-perfect accuracy.
Independently implements complex UI components with modern CSS. Optimizes rendering performance. Writes tests. Applies for state management.
Designs CSS architecture for fullstack applications: CSS-in-JS vs utility-first strategy, critical CSS management with SSR, style loading optimization. Defines styling standards and solves architectural CSS scaling problems for the team.
Defines organizational CSS strategy for fullstack projects: unified styling principles, cross-project consistency tooling, CSS performance budgets. Researches new CSS specifications and adopts them in product development.
Builds fullstack application UI components with Tailwind CSS from designs, using utility classes for typography, spacing and colors. Applies responsive prefixes for adaptivity and follows project design tokens.
Independently implements complex UI components with Tailwind CSS. Optimizes rendering performance. Writes tests. Applies for state management.
Designs style architecture for fullstack applications on Tailwind: unified design token config, component library with variants, Storybook integration. Defines styling standards for the team and ensures visual consistency.
Defines organizational design system strategy based on Tailwind: multi-brand architecture, white-label theming, shared config for fullstack projects. Ensures unified visual language across products and trains teams on scaling the style system.
Data Modeling 1
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Creates basic data models for fullstack features: tables with proper types, foreign keys, NOT NULL constraints. Understands the connection between database schema, backend types (TypeScript interfaces) and frontend data structure.
Independently designs schemas and optimizes queries with data modeling and schema design. Understands indexing and query execution plans. Uses Prisma/SQLAlchemy effectively.
Defines data modeling architecture for the fullstack platform: single source of truth in database schema, type auto-generation for backend and frontend through Prisma/GraphQL codegen. Establishes naming and model evolution standards for the team.
Shapes organizational data modeling strategy: domain-driven design in fullstack context, model versioning, schema evolution without breaking changes. Designs platform for managing data models at scale across multiple products.
Database Optimization 1
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Writes basic SQL queries (SELECT, JOIN, WHERE, GROUP BY). Understands that queries can be slow. Knows that EXISTS is usually faster than IN for subqueries.
Analyzes slow queries through EXPLAIN. Eliminates N+1 problems in ORM (eager loading, select_related). Optimizes JOINs (order, types). Uses window functions (ROW_NUMBER, LAG/LEAD). Understands the difference between correlated and non-correlated subqueries.
Designs query optimization strategy for the entire system. Configures automated slow query monitoring (pg_stat_statements, auto_explain). Optimizes cross-shard queries. Designs denormalization for critical hot paths. Makes decisions on precomputation vs real-time aggregation. Trains the team on query plan analysis.
E2E Testing 1
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Writes basic e2e tests for fullstack applications with Playwright or Cypress: page navigation, form filling, result verification. Understands the full test cycle from UI through API to database and back, uses page object pattern.
Creates e2e tests for critical fullstack scenarios: registration, payments, CRUD operations with database verification. Configures test environment with seed data, external service mocks and parallel test execution for speed.
Defines e2e testing strategy for the fullstack platform: critical scenarios for automation, balance with unit/integration tests, execution time SLA. Creates infrastructure for stable e2e tests and trains the team on effective practices.
Shapes organizational e2e testing strategy: platform for scalable test execution, AI-assisted test generation, quality monitoring through metrics. Defines standards for fullstack testing in production-like environments and chaos testing.
Frontend Architecture 1
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Understands SSR and SSG concepts in fullstack development: difference between server and client rendering, hydration, static generation. Creates simple pages with getServerSideProps/getStaticProps in Next.js, understands when each approach is appropriate.
Independently implements complex UI components with SSR/SSG/ISR patterns. Optimizes rendering performance. Writes tests. Applies for state management.
Designs rendering architecture for the fullstack platform: SSR vs SSG vs ISR strategy for different content types, edge rendering, CDN caching. Defines data fetching patterns for server rendering and standards for the team.
Defines organizational rendering strategy for fullstack products: server component architecture, edge-first approach, partial hydration. Researches and adopts new patterns (React Server Components, Islands Architecture) at organizational scale.
Frontend Testing 1
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Writes basic React/Vue component tests for fullstack applications with Testing Library: rendering, text verification, button clicks. Tests components with API request mocks and understands the principle of testing behavior, not implementation.
Independently implements complex UI components with component testing. Optimizes rendering performance. Writes tests. Applies for state management.
Designs component testing architecture for the fullstack platform: test utilities with preconfigured providers, backend mock standards, visual regression testing. Defines coverage strategy and trains the team on effective testing patterns.
Defines organizational component testing standards for fullstack projects: balance between unit/integration/visual tests, platform test utilities, test quality metrics. Creates infrastructure for scalable UI testing across the application ecosystem.
GraphQL 1
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Uses GraphQL queries in fullstack applications: writes queries and mutations on the frontend with Apollo Client or urql. Understands GraphQL advantage for frontend — requesting only needed fields, avoiding over-fetching compared to REST.
Implements GraphQL API for fullstack applications: schema with types, resolvers with DataLoader for N+1, mutations with validation. Configures codegen for auto-generating TypeScript types and React hooks, ensuring type safety from schema to UI.
Defines GraphQL strategy for the fullstack platform: schema-first vs code-first, service federation, governance process. Designs graph gateway architecture, naming standards and trains the team on effective GraphQL usage patterns.
Shapes organizational GraphQL strategy: federated supergraph for fullstack ecosystem, schema monitoring, breaking change detection. Defines GraphQL's role in API strategy vs REST vs tRPC and creates platform solutions for scaling.
Networking 1
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Understands basic networking concepts spanning frontend and backend — HTTP/HTTPS protocols, CORS, DNS resolution, and reverse proxy basics. Follows team guidelines for configuring API routing, SSL termination, and debugging end-to-end network connectivity issues.
Applies networking knowledge in fullstack development: CORS configuration for API, SSL/TLS certificates, HTTP/2 multiplexing. Understands CDN architecture for static assets, DNS configuration for domains and diagnoses latency issues between frontend and backend.
Designs network architecture for fullstack applications: HTTP/3 optimization for frontend, gRPC between microservices, VPN for internal services. Configures edge routing, optimizes TCP settings for WebSocket and resolves complex network interaction issues.
NoSQL Databases 1
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Performs basic MongoDB operations in fullstack applications: CRUD through Mongoose, simple queries and aggregations. Understands the document model and when it's preferable to relational, creates schemas for storing user form data.
Independently designs schemas and optimizes queries with MongoDB. Understands indexing and query execution plans. Uses Prisma/SQLAlchemy effectively.
Defines MongoDB strategy for fullstack projects: sharding for scaling, change streams for real-time frontend updates, replication. Designs hybrid PostgreSQL+MongoDB solutions and establishes modeling standards for the team.
Shapes document database strategy for fullstack organization: criteria for choosing MongoDB vs PostgreSQL, architecture for multi-model scenarios. Designs platform solutions for working with document data at scale across multiple products.
OOP & Design Patterns 1
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Understands the fundamentals of Design Patterns at a basic level. Applies simple concepts in work tasks using TypeScript/Python. Follows recommendations from senior developers when solving problems.
Independently applies design patterns across full stack: repository pattern for backend data access, strategy for interchangeable service implementations, observer for frontend reactivity, adapter for API integration layers. Explains pattern trade-offs for full-stack architecture coherence.
Applies design patterns across the entire stack: Repository and Unit of Work on backend, Compound Components and Render Props on frontend, BFF pattern for connection. Reviews team architectural decisions ensuring approach consistency.
Shapes organizational architectural pattern catalog for fullstack development. Defines when to apply CQRS, Event Sourcing, Micro-frontends. Creates reference implementations of end-to-end patterns from database to UI, mentors leads on their proper application.
React Ecosystem 2
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Uses Next.js at a basic level. Creates simple components from designs. Understands basic concepts and follows component guidelines.
Independently implements complex UI components with Next.js. Optimizes rendering performance. Writes tests. Applies for state management.
Defines frontend architecture at product level with Next.js. Establishes standards and best practices. Conducts architectural reviews.
Defines Next.js strategy as organizational fullstack platform: App Router with server components, API Routes as BFF layer, ISR for content pages. Designs monorepo architecture with shared packages between Next.js and backend services. Mentors leads.
Builds simple React components integrated with backend APIs. Understands JSX, props, and state for full-stack feature development. Follows component patterns established by the team for consistent UI layers.
Independently implements complex UI components with React Core. Optimizes rendering performance. Writes tests. Applies for state management.
Designs React architecture for fullstack applications: separating server and client components, data prefetching strategy, optimistic updates. Defines component library structure and backend integration standards for the team.
Shapes organizational React strategy for fullstack development: choosing between SPA and SSR, server component standards, data-fetching architectural patterns. Creates platform solutions for unifying frontend development at company scale.
State Management 2
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Implements basic data fetching patterns in fullstack applications: fetch/axios for REST API, handling loading/error states, displaying data in components. Understands the request lifecycle from client through server to database and back.
Implements data fetching patterns with React Query/SWR on the frontend and REST/GraphQL APIs on the backend. Optimizes caching, deduplication, and loading states across the full stack.
Defines data fetching architecture for the fullstack platform: BFF pattern for aggregation, tRPC or GraphQL for type-safe data fetching, caching strategy at all levels. Creates standard hooks and utilities for the team, optimizes waterfall requests.
Shapes organizational data-fetching strategy for fullstack development: unified data loading patterns, edge computing for nearest access, platform solutions for real-time synchronization. Defines architecture for scalable data exchange.
Manages fullstack application state at a basic level: useState/useReducer for local state, context for global data (theme, user). Understands the difference between server and client state in full stack context.
Independently implements complex UI components with State Management. Optimizes rendering performance. Writes tests. Applies for state management.
Defines state architecture for the fullstack platform: server vs client state strategy, data normalization, real-time updates through WebSocket. Creates standard patterns and utilities for the team, ensures predictable data flows.
Shapes organizational state management strategy: unified approaches for fullstack applications, distributed state, offline-first architecture. Designs platform solutions for data synchronization between client, server and database.
Type Systems 1
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Understands the fundamentals of Type Safety & Type Systems at a basic level. Applies simple concepts in work tasks using TypeScript/Python. Follows recommendations from senior developers when solving problems.
Independently applies type safety across frontend and backend — TypeScript strict mode for shared type definitions, API contract types with tRPC/GraphQL codegen, and end-to-end type-safe data flow. Understands trade-offs between runtime validation and compile-time guarantees across system boundaries. Applies type-safe patterns in code reviews.
Ensures end-to-end type safety in fullstack applications: from database schema through Prisma/Drizzle to tRPC or typed GraphQL resolvers and auto-generated frontend types. Implements Zod validation at layer boundaries, configures strict TypeScript for the entire monorepo.
Designs end-to-end type safety strategy for organizational fullstack platform. Creates type code generation tooling from a single source of truth (OpenAPI, Prisma schema). Defines contract testing standards between frontend and backend.
Web Performance 2
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Understands bundling principles in fullstack applications and can analyze bundle size through webpack-bundle-analyzer. Applies basic optimizations: dynamic imports for code splitting, tree-shaking unused code, dependency optimization.
Independently implements complex UI components with bundle optimization. Optimizes rendering performance. Writes tests. Applies for state management.
Designs bundling strategy for the fullstack platform: chunk architecture, shared dependencies in monorepo, lazy-loading strategy. Defines bundle size budgets, configures automated CI checks and optimizes shared client-server packages.
Defines organizational bundle optimization strategy: size standards for fullstack applications, automated regression monitoring, micro-frontend architecture. Researches and adopts new approaches: Module Federation, streaming imports, edge bundling.
Understands Core Web Vitals metrics (LCP, FID, CLS) and their impact on fullstack application UX. Measures metrics through Lighthouse and Chrome DevTools, fixes basic issues: image optimization, lazy-loading, preventing layout shift.
Independently implements complex UI components with Core Web Vitals optimization. Optimizes rendering performance. Writes tests. Applies for state management.
Designs Web Performance strategy for fullstack products: performance budgets, CWV monitoring in CI/CD, SSR pipeline optimization. Defines architectural decisions for achieving target metrics and trains the team on performance-oriented development.
Defines organizational performance strategy for fullstack products: Core Web Vitals SLAs, architectural patterns for optimal performance, edge-rendering strategies. Creates platform solutions for automated monitoring and optimization.
Web Standards & APIs 1
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Implements basic accessibility in fullstack applications: semantic HTML, alt texts, color contrast, focus states. Uses ARIA attributes for custom components and tests keyboard navigation in main user scenarios.
Ensures accessibility on both sides: implements server-side rendered accessible HTML with SSR frameworks, configures API responses for accessibility (alt text in image API, structured error messages). Tests with axe-core and verifies keyboard navigation.
Designs accessibility strategy for fullstack products: standards for server-rendered and SPA pages, a11y requirements in definition of done, automated checks. Trains the team on inclusive design and coordinates a11y audits.
Defines organizational accessibility strategy: WCAG 2.2 compliance, audit processes for fullstack products, a11y integration into design system. Creates standards and tooling for scalable accessibility across the application ecosystem.