JuniorDevSG - Code & Tell September 2025

Event Date: Monday, 15 September 2025
Venue: Staytion Lifestyle @ Dhoby Ghaut MRT
11 Orchard Road, Dhoby Ghaut MRT, #B1- 13, Singapore 238826

Venue Sponsor: Staytion Spaces
Food Sponsor: Ikigai Digital
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Presentations

Topic: Getting Started with Feature Engineering and Fine-Tuning for Classification Tasks

Speaker:
Maryana Hermawan, Software Engineer, PayPal
LinkedIn: https://www.linkedin.com/in/maryanahermawan/

Description
Curious about how machine learning models make predictions like spam detection or product recommendations? In this 30-minute session, we’ll walk through the basics of classification, one of the most common ML tasks. You’ll learn how to prepare your data through feature engineering, and how to improve your model’s accuracy using simple fine-tuning techniques. Designed for beginner software engineers, this talk will focus on practical steps you can apply with Python and common ML libraries like scikit-learn.

About Maryana
I'm Maryana, a software engineer at PayPal focused on payment systems and merchant onboarding. In my spare time, I dive into machine learning, large language models, and how emerging tech can be applied in real-world software.

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Topic: Building Digital Platforms at Scale: Lessons from Modern Banks - Moving from monoliths to modular, domain-driven architectures (bounded contexts)

Speaker:
Theo Chiu, Tech Lead, Ikigai Digital
LinkedIn: https://www.linkedin.com/in/theochiu2010/

Ikigai has worked on many greenfield/brownfield banks and in this talk we'll share our view on the past lessons learned, how we decide and choose the architecture and high level design, and also talk about how we made use of bounded context (DDD)

About Theo
I am a tech lead with extensive experience in fintech and digital banking. At Ikigai Digital, I focus on building virtual banks globally and integrating thin core banking systems like ThoughtMachine. I have helped deliver innovative digital banks such as Mox, Judo, and Union Digital. Additionally, I am heavily involved in technical recruitment and coaching, fostering talent to drive cutting-edge solutions in the financial sector.

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Schedule:
7:00 to 7:15 - Event Registration & Networking
7:15 to 7:20 - Introductory Remarks
7:30 to 8:00 - Topic 1
8:00 to 8:30 - Topic 2
9:00 - Supper

About JuniorDev SG:
JuniorDevSG is a developer interest group that focuses on providing a place for junior developers to learn and network with each other.
At the same time, we seek to be a support system to help junior developers break into tech, navigate their careers as well growing them to one day become senior developers or tech leaders in the tech industry.