Wenfeng Xing · projects

Long-term projects

Long-term Projects

86 words1 min read

Products, experiments, and open-source systems shaped by software engineering, finance, and knowledge management.

Why I Build

I do not build products to collect projects.

I build tools that I want to keep using ten years from now.

Most of them begin as personal needs, become software I rely on, and then gradually evolve into public tools, open-source libraries, or products that others can use too.

This page is not a portfolio in the traditional sense.

It is a builder’s lab: a place to track long-term work, research directions, public code, and ideas that are still early but worth preserving.

Roadmap

Progress across the lab

Active

Long-term products and tools I am actively building.

ResearchStarted 2026

Financial Calculation Engine

A Rust library for financial mathematics, cash-flow analysis, valuation, and reusable long-term financial tooling.

Status
Research
Stack
Rust
Current Focus
  • Cash-flow primitives
  • Valuation models
  • API design
BuildingStarted 2026

Personal Website

A long-lived personal publishing space for projects, writing, experiments, and public notes.

Status
Building
Stack
Astro • TypeScript • MDX
Current Focus
  • Sharper personal brand
  • Better project storytelling
  • Long-term writing workflow
BuildingStarted 2026

Time Archive

A digital time capsule designed to preserve memories, decisions, and predictions over years instead of days.

Status
Building
Stack
Next.js • Postgres • Rust
Current Focus
  • Email delivery
  • Public archive
  • Better search

Research

Ideas under investigation, prototyping, or technical exploration.

ExploringStarted 2026

Decision Journal

A structured system for recording decisions, assumptions, and later outcomes.

Status
Exploring
Stack
Product Research
Current Focus
  • Decision templates
  • Outcome review
  • Personal feedback loops
In ProgressStarted 2026

Real Estate Planner

A decision tool for comparing buying, renting, and investing through transparent financial models.

Status
In Progress
Stack
Rust • TypeScript
Current Focus
  • Scenario comparison
  • Mortgage modeling
  • Decision transparency

Open Source

Libraries, tools, and public code that support broader work.

MaintainingStarted 2026

Rust Financial Math

A focused open-source layer for financial mathematics and reusable modeling primitives.

Status
Maintaining
Stack
Rust
Current Focus
  • Core formulas
  • Documentation
  • Testing

Ideas

Future directions worth preserving before they are ready.

PlannedStarted 2026

Knowledge Graph

An early idea for connecting notes, projects, decisions, and timelines into one durable knowledge layer.

Status
Planned
Stack
Research
Current Focus
  • Information structure
  • Linking models
  • Long-term retrieval