ByteDance Java Backend Internship Interview – First Round Technical Topics Overview

ByteDance announced a massive internship recruitment of over 4,000 positions, with more than 360 backend internship openings across various departments, emphasizing flexible application opportunities and higher conversion to full‑time roles.

The author describes personal observations of early applicants securing offers and advises candidates to balance timely applications with thorough preparation of resumes and technical skills, noting that summer internships typically run from February to June.

The interview process generally consists of three technical rounds plus an HR round; the first round focuses on fundamentals and includes algorithmic questions, while the second round tests pressure handling, and the third round varies.

ByteDance First‑Round Technical Topics:

URL parsing: analyzing protocol, host, and resource path, handling illegal characters, and redirecting to search engines if necessary.

Cache lookup: checking browser, system (hosts), router, and ISP DNS caches to retrieve the server IP.

DNS resolution: querying root, top‑level, and authoritative name servers when caches miss.

MAC address acquisition: using ARP to obtain the destination MAC address or gateway MAC based on subnet relationship.

TCP connection establishment: three‑way handshake (SYN, SYN‑ACK, ACK) between client and server.

HTTPS TLS handshake: four‑step handshake preceding encrypted communication.

HTTP request sending: client sends request with method, URL, and headers after connection is established.

Server processing and response: server handles the request, reads resources, and returns an HTTP response.

The article concludes with promotional content offering free activation codes for IDEs like IDEA and PyCharm, as well as links to paid‑version usage encyclopedias, encouraging readers to scan a QR code for further details.