Student & Career

How to Crack Your First Tech Interview (Without a CS Degree)

The self-taught developer path is well-worn now, but the first job is still the hardest. Here's the 90-day plan that most successful career switchers use.

What tech interviews actually test

For entry / junior roles, interviewers care about:

1. You can write basic code and reason about it

2. You understand fundamentals (data structures, HTTP, git)

3. You can talk about tradeoffs — not just "which is right"

4. You'll be pleasant to work with

5. You'll learn fast

That's it. They know you don't know everything.

Days 1–30: Fundamentals

Build a solid foundation in one language (JavaScript or Python is easiest for job market).

• DSA basics: arrays, strings, objects/dicts, sets. Big-O intuition.
• Read the language's official docs — actually read them
• Build 3 small projects end-to-end. Not tutorials — real projects with bugs you fix.
• Learn git properly — branch, merge, rebase, resolve conflicts

Resources: The Odin Project, CS50, freeCodeCamp, Codecademy.

Days 31–60: Interview prep

Now the interview-specific work.

• LeetCode: do 1 easy per day for 30 days. Don't skip to mediums. Consistency > difficulty.
• Behavioral questions: prepare stories for "tell me about a time you…" using STAR format (Situation, Task, Action, Result). Have 5 stories ready.
• System design lite: understand REST APIs, databases (SQL basics), authentication, deployment
• Mock interviews: Pramp (free), Interviewing.io, or a friend

Days 61–90: Applications

• Portfolio: clean site with 3 projects, GitHub with clean READMEs, LinkedIn filled out
• Resume: one page, project-focused (see resume guide)
• Apply broadly: 5+ jobs per day, not "wait for the perfect one"
• Cold outreach on LinkedIn: message engineers at target companies. Genuine, short, ask for 15-min chat.

Expect a conversion rate of 5–15% application → interview. So 100 applications = 5–15 first-round chats.

The technical interview itself

• Talk through your thinking out loud — even "I'm going to try a brute-force first, then optimize" scores points
• Ask clarifying questions before coding — "Should I assume all inputs are positive integers?"
• Start with the easiest solution, then improve. Interviewers care about the journey.
• If stuck, say so. "I'm not sure — can I try X?" is fine. Silent typing for 5 minutes is not.

Behavioral interview

• Don't badmouth previous employers — instant red flag
• Have questions ready — never end with "no questions." Ask about team, tech stack, mentorship
• Be specific. "I made the app faster" is bad. "I dropped page load from 3.1s to 800ms by lazy-loading images" is great.

The rejection reality

You will get rejected 10–50 times before your first offer. That's not failure — it's the process. Every rejection sharpens the next round.

Signals you're close to hired

• You get past the phone screen consistently
• You're finishing coding challenges within time
• Recruiters call you back within a week
• You have questions for interviewers, not just answers

Keep going. First job is the hardest; the second one is 10x easier.

6 min read