[New Grad] SK AX (formerly SK C&C) — Coding Test + Interview (Final Offer) Recap (2023 H2)

📅 SK C&C (rebranded SK AX) 2023 H2 new-grad recruitment recap. Result: final offer on 2023-12-05 → onboarded. The group discussion was unexpectedly fun and burned off all my nerves before the role interview — that turned out to be the decisive factor.

Timeline

Coding test + SKCT in-depth (2023-10-22)

A. Coding test (9:00–11:00, 2h)

Q1 — Simulation (multi-monitor mouse movement)

Move a mouse pointer across multiple monitors. Each monitor's bottom-left is (0,0). When the pointer crosses to another monitor, distances are measured from that monitor's (0,0).

After N move commands, return the final position.

Just careful coordinate-system conversion — tractable.

Q2 — Dynamic programming (minimum value)

Recurrence-based minimum.

Couldn't find the recurrence, skipped. — A fairly standard DP in retrospect, but I didn't see it in the moment.

Q3 — Simulation (grid SLR cycle)

Move on a grid using S (straight) · R (right 90°) · L (left 90°). 180° on wall collision. Count visited cells + detect infinite loop.

Loop detection is the trick — track (x, y, dir) in a Set, break on duplicate.

Q4 — SQL (prefix sum)

Daily sales for a month → cumulative sales via SQL.

Window function SUM() OVER (ORDER BY date) is the clean answer. I wasn't fluent in window functions and went the self-join route — burned time.

4 problems in 2 hours was no joke. SQL prefix sum in particular — never written one from scratch before.

B. SKCT in-depth (13:00–14:30, 1.5h)

SK's in-depth personality test. Answer consistently — answering as your actual self scores higher than trying to look good (the system catches inconsistency).

Result: passed coding + SKCT.

1-day interview (2023-11-15)

Group discussion + role/personality interview. Order is randomized per candidate.

A. Group discussion

8 candidates → Team A (4) + Team B (4) with opposing positions, then negotiate.

A scoreboard is given — scoring more points than the other team is the goal. Everything from internal coordination is being graded.

Personally I thought the group discussion was genuinely fun. Lost track of time. That burned off all my nerves before the role/personality interview — which I then handled relaxed.

Tips: - Inside your team, pre-divide roles (lead · arguments · mediator · scribe). - Don't dismiss the other team — cite their points, then rebut. - Remember it's scoring, not pure negotiation. Don't lose sight of the goal.

B. Role/personality interview

Topic given as pre-assignment → 2-page PPT (3 with cover) → ~10-min presentation → panel Q&A.

• Panel: 3 interviewers
• Candidates: 2

I felt I presented well in this round and conveyed about 99% of my actual view. No regrets — could tell I had a real chance.

Tips: - 2 slides — 1 conclusion + 1 supporting evidence. Cover slide = name + title only. - 10-min slot → simulate 5 min presentation + 5 min Q&A. Cap delivery at 7 min for safety. - Listen to the other candidate actively — differentiate your answers.

Final result

Offer on 2023-12-05.

The nerve burn-off from the group discussion was decisive. Knowing how to manage the interview vibe mattered as much as the content.

Takeaways — for SK-group new-grad

• Coding: simulation + DP + SQL. Pre-practice SQL prefix sum (window function or self-join).
• SKCT in-depth: answer as yourself, consistently. The system spots faking.
• Group discussion: if you have no debate experience, do 1–2 mock rounds. Decide your role in advance.
• Pre-assignment PPT: 2 slides — conclusion + evidence. Cover slide simple.
• Role/personality interview: target 99% honest self-conveyance. Short, clear presentation.

Good luck.

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📦 Migrated from my own Korean blog (my own writing). Original: taehyuklee.tistory.com/7