Under the current Tech Job Market,Atlassian still the Dream Company for many CS graduates. High salary, work-life balance, and a very competitive technology stack. However, the threshold is becoming visibly higher.
Recently, the ProgramHelp team successfully assisted a student from UNSW in getting an SDE offer from Atlassian's Australian headquarters. The whole process took nearly a month and went through the hell mode of 1 round of OA + 4 rounds of Tech/BQ.
Many people think that everything will be fine once HackerRank is completed, but they do not know that the depth of Atlassian's investigation has already involved Number Theory and System Design. Today we will dismantle this interview in depth and tell you why just relying on the Top 100 is not enough.
Round 1: Screening (The Gatekeeper)
Format: HR phone interview
Difficulty: ⭐⭐
This round is mainly Verification. HR will dig into resume details.
- Expert advice: Many students fail here becauseI made a fake resume but it didn’t come back. Our Resume Polish service is not only about changing the grammar, but also helping you sort out the logical closed loop of the Tech Stack, ensuring that you can answer fluently when facing HR's follow-up.
Round 2: Online Assessment (the link with the highest screening rate)
Platform: HackerRank
Duration: 100 minutes
Content: LeetCode Medium – Hard
Core test points: Euler’s Totient Function, Dynamic Programming (DP)
Review analysis:
This is a nightmare for many people. 100 minutes may seem like a long time, but the questions are very tricky. This time the students encountered a question about Totient Function. This is a typical number theory test point. If you only take regular Array/String questions, you will most likely be confused on the spot when you encounter this kind of question.
In addition, DP questions are usually accompanied by complex Edge Cases and strict Time Complexity requirements (usually requiring \(O(N)\) or \(O(N \log N)\)).ProgramHelp exclusive benefits:
For this highly mathematical OA, our team's support team consisting of ACM gold medal players and Math PhDs can provide real-time support. We don't just give you answers, but provide original code that meets your coding style and has been checked for plagiarism.
Round 3: General Tech Interviews (Practical Meat Grinder)
This phase is usually divided into 3 separate sessions of 1 hour each.
Session A: Coding + DSA
- Inspection points: Basic data structures and algorithms.
- Pain points: The question itself may only be Medium difficulty, but the interviewer requires you Think Aloud(Tell it as you do it).
- Our services: Many international students can write code, but their mouths cannot keep up. ProgramHelp's VO real-time voice assistance can prompt you with problem-solving ideas and key terms in real-time and covertly during the interview, making you sound like a senior engineer, not just a question-answering machine.
Session B: System Design (System Design Round)
- Inspection points: Design a scalable system (e.g. design an instant messaging system or short link generator).
- trap: For Junior/New Grad, this is a blind spot. What the interviewer values is your understanding of Scalability (scalability), Database Choice (selection) and Latency (delay).
Session C: Values & Management
- Inspection points: Atlassian’s famous values review (“Open company, no bullshit” etc.).
Round 4: Team Match & Manager Interview
Interviewer: Senior Manager
Core test points: Behavioral Questions (BQ) + Adaptability
Students were asked:
“Describe a time when you had to adapt to a significant change in a project or work environment.”
In-depth analysis:
Atlassian's products iterate very quickly, and they attach great importance to candidates' agility.
The STAR rule (Situation, Task, Action, Result) must be used to answer here.
- Error example: "The project changed its requirements, so I rewrote the code according to the new requirements." (Too passive, lack of thinking)
- High score answer: Even when facing Scope Creep, you need to show how to evaluate Impact, how to communicate Timeline changes to Stakeholders, and how to ensure that code quality does not decrease.
Technical information: Euler’s Totient Function code implementation
In order to prove the technical strength of our team, here is the efficient implementation of the number theory test point encountered in OA - the Euler function (calculating the number of positive integers less than or equal to $n$ and relatively prime to $n$).
If you use Brute Force to calculate GCD for this question, the time complexity is \(O(N \log N)\), and it will definitely fail (TLE) under the big data Test Case.
Must use Euler product formula to optimize to \(O(\sqrt{N})\).def calculate_totient(n):
"""
Calculates Euler's Totient Function phi(n).
Counts the number of positive integers less than or equal to n
that are relatively prime to n.
Time Complexity: O(sqrt(n))
Space Complexity: O(1)
"""
result = n
p = 2
# Prime factorization based on the Fundamental Theorem of Arithmetic
while p * p <= n:
# Check if p is a prime factor of n
if n % p == 0:
# Apply Euler's product formula: result = result * (1 - 1/p)
# Transformed for integer arithmetic: result = result - (result // p)
while n % p == 0:
n //= p
result -= result // p
p += 1
# Handle the remaining prime factor if n > 1
# This case happens if n itself is prime or has a prime factor > sqrt(n)
if n > 1:
result -= result // n
return result
# Example Usage
# Input: 9
# Output: 6 (1, 2, 4, 5, 7, 8 are coprime to 9)
if __name__ == "__main__":
test_val = 9
print(f"Phi({test_val}) = {calculate_totient(test_val)}")Atlassian's interview process is long and comprehensive, from number theory algorithms to system design to value matching. Mistakes in any link will lead to wasted efforts.
Don’t try and make mistakes with your offer
Calculate an account: Total Compensation (TC) for Atlassian SDE even in Australia $140k – $180k AUD Get started. The cost of our full-process assistance is only your salary for the next two days.
Do you choose to face math questions on HackerRank so anxiously that your hands are shaking? Or choose to let ProgramHelp’s Ex-Google mentor team be your strongest support?
Next Step: Contact us now to get:
- The latest OA high-frequency question bank from major manufacturers (with analysis).
- Reserve VO real-time assistance Schedule (vacancies are tight this month, first come first served).
