# techinterview.org

> Engineers writing for engineers. In-depth, current guides for technical interviews: system design, algorithms, company-specific interview processes, AI/ML, and quant finance. Aged, high-authority reference site (since 2010).

## Reference (cheat sheets and indexes)
- [Interview Prompt Library](https://www.techinterview.org/interview_prompt_library/): copy-and-run prompts that turn ChatGPT, Claude, or Gemini into a mock interviewer, design critic, resume reviewer, or negotiation coach; one page per prompt with fill-in blanks.
- [Bootcamp Directory](https://www.techinterview.org/bootcamp_directory/): a dated status ledger of tech-career bootcamps and programs across ten categories (software engineering, AI/ML, data, quant, finance tech, cybersecurity, cloud, interview prep, engineering management, returnships); verified tuition, financing, outcomes tier, and an interview-prep depth score per program. No rankings or lead forms.
- [Video Interview Tech](https://www.techinterview.org/video_interview_tech/): Wirecutter-style buying guides for video-interview gear (webcams, microphones, lighting, backgrounds, acoustic treatment, headsets, stands, connectivity), one pick per budget with the interview-specific reason.
- [Cheat Sheet Library](https://www.techinterview.org/cheat-sheets/): every cheat sheet and quick reference in one place.
- [Quant & HFT Firm Interview Guides](https://www.techinterview.org/quant-firm-interview-guides/): interview guides for quant, HFT, and prop-trading firms.
- [Interviewing in the AI Era (2026)](https://www.techinterview.org/ai-era-interview-guide/): how technical interviews changed in 2026 and how to prep.
- [Big-O Cheat Sheet](https://www.techinterview.org/big-o-cheat-sheet/): time and space complexity for common data structures and algorithms.
- [Algorithm Patterns Cheat Sheet](https://www.techinterview.org/algorithm-patterns-cheat-sheet/): the recurring coding-interview patterns and when to use them.
- [Problem Index](https://www.techinterview.org/problem-index/): browsable index of coding problems.
- [Problems by Difficulty](https://www.techinterview.org/problems-by-difficulty/)

## Tools
- [Interview Prompt Library](https://www.techinterview.org/interview_prompt_library/): copy-and-run prompts that turn ChatGPT, Claude, or Gemini into a mock interviewer, design critic, resume reviewer, or negotiation coach; one page per prompt with fill-in blanks.
- [Video Interview Tech](https://www.techinterview.org/video_interview_tech/): Wirecutter-style buying guides for video-interview gear (webcams, microphones, lighting, backgrounds, acoustic treatment, headsets, stands, connectivity), one pick per budget with the interview-specific reason.
- [All free tools](https://www.techinterview.org/tools/): hub of free, no-login, in-browser interview-prep and job-search tools.
- [Study Plan Generator](https://www.techinterview.org/study-plan/): free, no-login tool that builds a week-by-week coding-interview study plan from your available hours, linking the patterns and problems to practice.
- [Resume & ATS Checker](https://www.techinterview.org/resume-checker/): free, no-login, in-browser tool that scores resume ATS-readiness and keyword match against a job description.

## Topics
- [Browse all topics](https://www.techinterview.org/topics/): index of every category, industry, and tag archive on the site.
- [System Design](https://www.techinterview.org/category/system-design/): designing scalable systems, with worked interview walkthroughs.
- [Algorithms](https://www.techinterview.org/category/algorithms/)
- [AI/ML Interview Questions](https://www.techinterview.org/category/ai-ml-interview-questions/)
- [Quant Finance](https://www.techinterview.org/category/quant-finance/): quant developer and trading-firm interviews.
- [Frontend Engineering](https://www.techinterview.org/category/frontend-engineering/)

## Company interview guides
- [Breaking Into Wall Street](https://www.techinterview.org/wall-street/): tech and strats interview guides for major investment banks, quant funds, and prop-trading firms.
- [All Company Guides](https://www.techinterview.org/companies/): round structure, real questions, and what each firm screens for (FAANG, AI startups, quant/HFT).

## Study roadmaps
- [Beginner (0-1y)](https://www.techinterview.org/beginner-interview-guide/)
- [Intermediate (2-4y)](https://www.techinterview.org/intermediate-interview-guide/)
- [Advanced (5+y)](https://www.techinterview.org/advanced-interview-guide/)

## Machine-readable content
Append `?format=md` to any article, guide, or page URL on this site to get a clean Markdown rendition (title, updated date, headings, tables, code) — ideal for ingestion and citation.