Systems / Decisions / Outcomes
Karthik Raj
Year 3 · Computer Science · Singapore I build small, reliable tools for everyday annoyances, and I'm learning to make them survive exam week.
Explore selected work
Selected work
Bus Tracker for Hall 7
Every weekday morning our hall group chat got about 20 'is the shuttle here yet?' messages, and half the answers were guesses. The official app needed four taps and didn't know which stop we used.
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Slide 1 of 3: Bus Tracker for Hall 7
Experience
Software Engineering Intern
Harbourline (logistics start-up)
- Wrote integration tests for the route-pricing API, taking coverage from 48% to 71% and catching two real pricing bugs.
- Fixed a timezone bug that showed Saturday deliveries as Friday in the driver app. Three days to find, one line to fix.
- Shipped a small 'explain this price' endpoint the support team now uses.
Teaching Assistant
Programming Methodology (Year 1 module)
- Ran a weekly lab for 18 first-years and wrote three extra practice sets on recursion.
- Most-asked question: 'why is my list empty?' Usually a missing return.
Part-time Data Entry Assistant
A family friend's printing shop
- Typed up order forms until I wrote an Excel macro that did most of it. That's where I got hooked.
More projects
Hall Laundry Ping
Tap 'started', get a ping at 45 minutes. Used by one floor, then forgotten.
Slide 1 of 4: Hall Laundry Ping
About
I got into programming because I was tired of doing the same spreadsheet task every week at my first part-time job. That's still most of what I enjoy: noticing small, repeated annoyances and building something boring and reliable for them.
I like writing tests first (most of the time), reading other people's code, and explaining things slowly to first-years.
Outside class I play futsal on Wednesdays (enthusiastic, not good), cook one reliable chicken curry from my mum's recipe, and keep a list of 'apps I'd build if I had time'. It's 41 items long.
Education & community
Bachelor of Computing (Computer Science), Year 3, Singapore.
Software engineering focus, minor in Statistics. Modules: Data Structures & Algorithms, Software Engineering, Database Systems, Computer Networks, Operating Systems, Human–Computer Interaction. Dean's List, AY2024/25. Exchange semester applied for January 2027.
Hall 7 Tech Committee (2024–now): I look after the room-booking spreadsheet, which I'm trying to retire, and the bus bot. Peer mentor at freshmen orientation, 2025. Volunteer at two Saturday coding workshops for secondary-school students.
Campus Hack 2025: second place with a lost-and-found board. Talk: 'Tests are for future you', Hall Tech Night, March 2026. Blog post: 'What finals week taught my bus bot'.
Kind words
Asks the second question: not 'does it work?' but 'what happens when it doesn't?'
Engineering manager, Harbourline
Made us actually review each other's code. Annoying in week 3, life-saving by week 10.
StudyRoom teammate
Skills
- Python
- PostgreSQL
- Playwright
- Code review
- TypeScript
- Git
- pandas
- Reading unfamiliar code
- SQL
- Java
- Rust
- Explaining to first-years
- React
- Docker
- System design
- Node
- GitHub Actions
- Testing first
Recent updates
18 Sep 2026
29 Aug 2026
8 Jul 2026
20 May 2026
15 Mar 2026
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