Experience

Cross Compass, Ltd.

• Japan
• Research Services
• 1 - 100 Employee

• Programmer

  • Mar 2019 - Present



Self-employed

• Software Engineer

  • May 2018 - Present



Jane Street

• United States
• Financial Services
• 700 & Above Employee

• Systems Developer

  • May 2007 - Mar 2018

  * Managed projects and coordinated vendors and internal people for building colocation datacentres in Tokyo and Mumbai. Proceduralised the process with checklists, project dependency mappings and typical estimated timelines to make it more efficient. * Mentored interns and new hires with their programming projects and company procedures and culture. * Developed and maintained software. Some examples: * A marketdata administration tool chain for installing; querying; starting and stopping individual or sets (according to a query language); and performing other maintenance tasks of marketdata feedhandlers. (OCaml) * A compliance system for tracking employees and visitors to the Hong Kong site; extracting their communications logs and trading activity; and storing them for regulatory compliance. (OCaml) * Automated release, deployment, rollback and lock control of the restricted access DMZ-based Single Sign-on (SSO) system (OCaml) * Took over development and maintenance of the company's SSO service. Overhauled the code for maintainability and better fault tolerance. Abstracted the SAML Consumer Service support to make it possible to add new assertion consumers. (Python) * Many small shell scripts and command-line one-liners (Bash) * Re-architected company Yubikey infrastructure to decouple it from the Single Sign-On system, secure it by moving it from the DMZ to the local network, migrate to PostgreSQL and implement full redundancy. * Systems administration of over 80 physical linux (CentOS) servers and many more virtual servers facilitating manual and automated trading in the Hong Kong based office. Racked and built the original linux infrastructure for the Hong Kong office in 2010.



Pisces Communications

• Systems Administrator

  • Apr 2003 - Jul 2005