Database

Expert guidance on Matplotlib for creating static, animated, and interactive visualizations in Python.

Expert guidance on NumPy for numerical computing, array operations, and linear algebra in Python.

Expert guidance on Pandas for tabular data manipulation, transformation, and analysis in Python.

Expert guidance on Polars for high-performance dataframe operations with a lazy query engine in Python.

Expert guidance on scikit-learn for building, evaluating, and deploying machine learning models in Python.

Array and string manipulation patterns for technical coding interviews

Behavioral interview preparation using the STAR method and leadership principles

Time and space complexity analysis for technical coding interviews

Dynamic programming patterns and techniques for technical coding interviews

Linked list, stack, and queue patterns for technical coding interviews

SQL query patterns and database concepts for technical coding interviews

System design interview framework and common architecture patterns

Tree and graph algorithm patterns for technical coding interviews

Ethical techniques for handling CAPTCHAs, rate limiting, and bot detection while scraping responsibly

HTML and XML parsing with Beautiful Soup in Python for flexible data extraction

Fast server-side HTML parsing and data extraction with Cheerio using jQuery-like syntax

Patterns for building robust scraping data pipelines with validation, deduplication, storage, and monitoring

Cross-browser web scraping with Playwright, supporting Chromium, Firefox, and WebKit

Headless Chrome browser automation with Puppeteer for scraping dynamic, JavaScript-rendered pages

Production-grade web scraping framework in Python with built-in crawling, pipelines, and middleware

Browser-based web scraping and automation with Selenium WebDriver across multiple languages

Appwrite self-hosted BaaS with database, auth, storage, and serverless functions

AWS Amplify BaaS with AppSync GraphQL, Cognito auth, S3 storage, and Lambda functions

Backendless BaaS with real-time database, user authentication, Cloud Code, messaging, and file storage for web and mobile apps

Clerk authentication service with pre-built UI components, session management, and multi-framework support

Convex real-time backend with reactive queries, mutations, and serverless functions

Encore is a backend development platform that automatically provisions, configures, and manages cloud infrastructure based on your Go code. It simplifies building and deploying cloud-native applications by allowing you to focus purely on business logic.

Firebase BaaS with Firestore, Authentication, Cloud Functions, and Hosting

Hasura is an open-source engine that connects to your databases (PostgreSQL, MS SQL, etc.) and instantly gives you a production-ready GraphQL API. It simplifies data access, real-time subscriptions, and authorization management, making it ideal for rapidly developing data-driven applications.

Nhost BaaS with Hasura GraphQL, PostgreSQL, authentication, and storage

Parse Server is an open-source backend framework that provides a scalable and flexible way to build web and mobile applications with a self-hostable backend-as-a-service (BaaS). It offers database management, REST APIs, GraphQL, push notifications, and user authentication.

PocketBase single-binary BaaS with SQLite, auth, real-time, and file storage

Strapi is an open-source, headless CMS that allows you to build custom APIs and manage content. Use it when you need full control over your backend, a flexible content structure, and a powerful admin panel.

Supabase BaaS with Postgres, Auth, Realtime, Storage, and Edge Functions

Identify and fix common code smells that indicate deeper design problems

Manage dependencies and reduce coupling to build modular, flexible systems

Implement clean error handling strategies that keep code readable and robust

Design small, focused functions that do one thing well and are easy to test

Choose clear, intention-revealing names for variables, functions, classes, and modules

Apply common refactoring patterns to improve code structure without changing behavior

Apply SOLID principles to design flexible, maintainable object-oriented code

Design effective tests using the testing pyramid, clean test structure, and test-driven thinking

Configure Content-Security-Policy headers to mitigate XSS, data injection, and clickjacking attacks.

Configure CORS headers correctly to control cross-origin resource access while preventing overly permissive policies.

Protect web applications against cross-site request forgery (CSRF) using tokens, SameSite cookies, and origin validation.

Validate and sanitize all user input at application boundaries using schemas, type coercion, and allowlists.

Verify an existing private image upload path with real byte-level and authorization tests, from bounded ingestion and normalization through authenticated preview and an approved media revision. Use for image upload regressions or acceptance review, not arbitrary malware scanning or live social publishing.

Securely store, access, rotate, and audit application secrets and credentials using vaults, environment variables, and CI/CD integrations.

Prevent SQL injection attacks using parameterized queries, ORM best practices, and input validation layers.

Secure your software supply chain by auditing dependencies, pinning versions, verifying integrity, and monitoring for vulnerabilities.

Prevent cross-site scripting (XSS) attacks through output encoding, input sanitization, and secure rendering practices.

Convert React class components to functional components with hooks

Migrate a Create React App project to Next.js for server-side rendering and file-based routing

Migrate a JavaScript codebase to TypeScript incrementally with minimal disruption

Migrate a test suite from Jest to Vitest for faster execution and native ESM support

Decompose a monolithic application into microservices using the strangler fig pattern

Migrate a REST API to GraphQL while maintaining backward compatibility

Migrate from a relational SQL database to a NoSQL document or key-value store

Migrate a Webpack-based project to Vite for faster development builds and HMR

Server-side form mutations with action functions, progressive enhancement, and optimistic UI in Remix