Portrait of Soichi Hayashi

Soichi Hayashi

Software Engineer - Since 2001

I build tools that help portfolio managers and researchers understand risk, performance, and attribution across complex global portfolios. I work for an asset management company modernizing internal analytics platforms so investment teams can explore data and make decisions quickly and with confidence.

About

Now: My current focus is quantitative finance  building reliable, explainable analytics for equity and multi-asset portfolios at an asset management company so portfolio managers can understand risk, performance, and attribution with more clarity.

Previously: I spent many years working at the intersection of research computing and user-friendly web platforms, making complex pipelines easier to use for scientists and engineers.

I still care a lot about good tooling and infrastructure  whether it's for neuroimaging (brainlife.io), disaster resilience (APRED), astronomy portals, geospatial data services, or internal investment platforms used every day by portfolio managers.

For a deeper dive into my academic and professional history, you can also view my resume.

What I Work With

I typically work across the stack, from data pipelines and distributed systems down to frontend visualizations.

  • Languages: JavaScript/TypeScript, Python (Pandas/Numba), Java, PHP, C/C++
  • Frontend: React, Vue, WebGL/Three.js, modern CSS
  • Backend & Data: FastAPI, Node.js/Express, MongoDB, SQL databases
  • Infra & Cloud: AWS, OpenStack/Jetstream, Docker, Karpenter, Nginx
  • Domains: Neuroscience, astronomy, geospatial data, quantitative finance

Old Projects

Here are a few representative projects I've helped build or maintain:

  • brainlife.io b7 Free cloud platform for secure neuroscience data analysisa0afa0supporting complex workflows, reproducible pipelines, and rich visualizations.
  • APRED b7 Analysis Platform for Risk, Resilience and Expenditure in Disasters, helping practitioners explore resilience scores, vulnerable businesses, and storm history.
  • One Degree Imager Portal b7 Web portal for astronomers to browse, filter, and process ODI data products.
  • ezBIDS b7 A web service that converts directories of DICOM images into BIDS without requiring users to write Python or custom config files.
  • autohpss b7 Simple tooling for archiving and restoring data from HPSS / SDA.
  • Indiana Spatial Data Portal b7 Backend services and workflows to stage geospatial data from archival storage and make it easily downloadable.

You can find more experiments and tools on my GitHub profile and on brainlife.io.