Jonathan Koh
Fullstack Software Engineer @ Singapore Press Holdings
Building robust, enjoyable software—lately leaning into low-level engineering and complex, data-driven systems.
About
👋 Hi, I’m Jonathan, thanks for stopping by!
I’m a frontend-focused Fullstack Engineer with a strong interest in building purposeful digital experiences. Starting my journey in frontend development, I’ve since expanded into backend maintenance using Python and Node.js at SPH, while independently building fullstack applications with frameworks like Next.js and a range of modern tools such as Drizzle, Zod, and others.
My passion lies in solving real-world problems through code—like creating a personal finance tracker, Tithely, to manage my spending more effectively. I value clean, readable codebases, and I’m motivated by the power of automation, long-term maintainability, and the ability to turn simple ideas into products that live on.
While I’m still growing in architectural and strategic influence, I’m proud of transitioning from a data-related background into software engineering and web development. I’m currently deepening my technical skill set by exploring lower-level languages like Go, C and Haskell, with an eye toward more systems-level thinking. I’m especially drawn to fintech, where I hope to merge my interest in personal finance with meaningful engineering challenges. Roles like quantitative developer intrigue me as potential next steps in my journey.
Professional Experience
NOV 2023 - PRESENT
Fullstack Software Engineer · Singapore Press Holdings (SPH)
I build dynamic UIs and maintain backend services using NodeJS and Python for reliable content delivery. Working within agile teams, I contribute to feature planning, ensure code quality, and integrate third-party services. Currently focused on developing an internal analytics platform that enables teams to create audience segments through custom data queries and provides actionable insights via scalable, data-driven interfaces.
SEPT 2021 - OCT 2023
Frontend Web Developer · New Creation Church (NCC)
Developed and debugged 30+ SPAs in Webflow using HTML, CSS, and JavaScript over 2 years, while streamlining development by consulting on design feasibility and building reusable, scalable UI components.
MAR 2021 - SEPT 2021
System Analyst · Grab Financial Group (Contract)
Boosted loan recovery rates from 87% to 93% through strategic collection initiatives, recovering an extra SGD$0.33M in 2 months and improving platform efficiency for users.
AUG 2020 - DEC 2020
Data Engineer · Alibaba Group (Contract)
Improved NLP model accuracy by 8% through web crawling and continuous training, helping win a competitive contract.
Featured Projects
Tithely v2 – Full-Stack Budgeting & Expense Management SaaS Application
Built a robust full-stack SaaS app to help users track personal expenses, set budgets, and manage finances efficiently. Features real-time updates, intuitive UI, and data persistence, designed for daily use and long-term financial planning.
coming soon...
Mortgage Loan & Amortisation Calculator
Built a user-friendly mortgage calculator with real-time inputs and dynamic amortisation tables. Designed for clarity and usability, enabling users to understand monthly payments, interest accumulation, and total repayment costs over time.
coming soon...
Driving Costs: An End-to-End COE Data Pipeline & Dashboard
Built a full ETL pipeline to collect, transform, and visualize Singapore’s Certificate of Entitlement (COE) bidding data using Python. Developed interactive dashboards to explore long-term trends, pricing volatility, and data-driven insights on whether it's a good time to buy a car in Singapore.
coming soon...
Market Pulse: Predicting Stock Trends with Machine Learning
Developed a predictive analytics dashboard that forecasts stock prices using historical trends, technical indicators, and time series models like Prophet and XGBoost. The project showcases end-to-end capabilities—from data ingestion and feature engineering to model deployment and visualization.
coming soon...
Low-Level Logging Library
A lightweight, asynchronous logging utility written in Rust, designed for high-performance CLI and systems applications.