At Kasetsart University in Bangkok, Thailand, all Computer Science 4th-year students are required to intern at a tech company to gain real-world experience.
In this post, I want to share my journey of becoming a Software Engineer, Backend Intern at LINE MAN Wongnai (LMWN) — what the process was like, and what I learned.
A Little About My Background
I first started my programming journey during my first year of college. At the time, I focused mainly on learning data structures and algorithms, practicing problem-solving on LeetCode.
Later on, I wanted to build real projects, so I started learning web development, mostly focusing on the Frontend side using React and Next.js.
However, as I worked more on frontend projects, I realized that what I enjoyed most was solving logic and system problems.
That's when I decided to shift my focus toward Backend development, where I could dive deeper into building systems, solving technical challenges, and optimizing performance. The parts of engineering that truly excited me.
Starting the Internship Hunt
By the time I reached my 3rd year, I began searching for a tech company to intern at.
I had a simple checklist:
- Hands-on experience
- Opportunities to work on impactful projects
- A chance to learn from great engineers
LINE MAN Wongnai checked all the boxes, so I applied through their career page for the position of Intern - Software Engineer, Backend (Java).
The Interview Process
After submitting my resume, I waited about two weeks before receiving an email from HR saying I passed the initial screening.
They sent me an assignment to complete within one week. Since I applied for a Java backend position, the task was based on:
- Building a Spring Boot REST API
- Optimizing code for performance and clarity
I took my time to carefully work on it and submitted it before the deadline.
Almost one month later, I finally heard back — good news!
I had passed the assignment round and was invited to a phone screening interview in English.
This round focused mainly on:
- My background
- Why I wanted to join LINE MAN Wongnai
After passing the phone screen, I moved on to the final round: an interview with the engineering team.
This session lasted about two hours and focused on two main areas:
- Technical Background: discussing my past projects, tools I used, and basic Java knowledge
- Coding Interview: writing Java code, especially applying a design pattern (related to the position I applied for)
Right after the interview ended, I received a call from HR — I passed!
They offered me the internship immediately (it was super fast!), and of course, I happily accepted.
My Internship Experience
During the internship, I didn't just work on random or dummy projects — I was trusted to contribute to real projects that directly impacted users.
I collaborated closely with senior engineers and product managers to develop new features for the Wongnai Merchant Application.
It was a true hands-on experience, and I learned a lot about how real-world software development works — not just coding, but also communication, teamwork, and problem-solving.
What Happened After
After I completed my internship, I was offered to continue working with LINE MAN Wongnai as a part-time software engineer while finishing my studies.
Eventually, after a great time there, I decided to move on and start the next chapter of my journey.
Final Thoughts
My internship at LINE MAN Wongnai was a big step in my career, teaching me both technical skills and the value of working on meaningful projects with great people.
If you're a student looking for an internship, find a place where you can learn, grow, and make an impact — just like I did.
Even if you're new to programming or lack prior internship experience, you can still land great opportunities. The key is to focus on building meaningful projects, staying curious, and improving consistently.
Everyone starts somewhere. Keep pushing forward, and the right opportunities will come.