Roy Philip Full-stack engineer · Surabaya, Indonesia
I build, repair, and simplify production systems—from internal workflows and data infrastructure to AI-assisted tools and customer-facing products.
A decade of production systems across e-commerce, developer tooling, financial infrastructure, and applied AI.
Selected work
The strongest work is rarely one clean feature. It is a chain of technical and business decisions that has to hold together.
01 · Systems
Corporate websites, operational tooling, deployment recovery, and workflow automation shaped around how a business actually runs—not how a clean-room specification imagines it.
Private client work · Internal tools · Workflow rescue
02 · Finance
A financial-grade Etherscan V2 client with transport-level BigInt, runtime validation, and resilient rate limiting—developed from production requirements, not a wrapper tutorial.
03 · Applied AI
A 120-run benchmark across 12 models tested whether LLMs parse JSON or XML more reliably. The evaluation, prompts, and source data are public and reproducible.
Open source and useful tools
Writing
How we rebuilt the Etherscan V2 client from scratch to solve financial precision, runtime validation, and rate limiting for blockchain investment infrastructure.
We tested 12 major LLMs across 8 companies. A definitive, data-driven analysis reveals that format preference is dictated by a model's underlying architecture, not a universal rule.
Have a difficult system?