Simple LLM
An experiment in post-training Qwen3.5-4B to write clear, correct technical answers in simple English.
GitHub repositorySFT articleGRPO articleHuggingFace artifacts
About me
I’m a data scientist by training and a problem solver at heart.
Over eight years at GoTo (Indonesia’s #1 tech company), I invented GoFood’s first recommendation engine , built real-time contextual-bandit pricing systems that increased gross take by 15%, and grew a data team that doubled monthly ad revenue to $2M USD.
I later led the modernisation of GoFood’s Search and Recommendations stack using vector retrieval, deep ranking and LLM-powered relevance, driving record growth for the company through a 13.5% uplift in overall conversion. I also led 50+ data scientists through GoTo’s cloud migration (one of the most complex in SEA ), reducing infrastructure costs by 40%.
My work spans AI/ML, software/data engineering, experimentation, analytics and leadership. But the goal has always been the same: build systems that scale and create real value.
Showcase
In my free time, I enjoy tinkering, breaking things, and figuring out how they work from first principles.
Jev Benchmarks
Reproducible comparisons of Jev against supervised and zero-shot baselines across five NLP benchmarks.
Learning Resources
Practical resources for learning AI, language models, and data science from first principles.
Personal AI WikiLLM KoansLLMs in 10 WordsData Science Reading List
Side Quests
Small experiments and useful automations built to explore an idea or solve an immediate problem.
Self-Hosted HermesSokoban SolverSQL AgentDev EnvironmentDMV Stalker
Let’s connect
You can find my work on GitHub, read my writing on Medium, or reach me through LinkedIn/Gmail.