Leslie Johnson

bithits@gmail.com

github.com/LeslieJohnson

Bio

Bell Labs Murray Hill, NJ

Software Engineer/Developer for Computer Research, Consumer Labs

Infolabs

Founder and Principal Engineer

Major Skills

Linux/DevOps

Systems

• Architectures/System Design

  • Distributed Unix telephone voice message system (AT&T)

  • Clustered Linux speech processing servers and network (Bell Labs)

  • Client/Server math solver GUI sales tool (Bell Labs w/Brian Kernighan)

  • Linux no-sql document database access control system (Boeing)

• Internals

  • Wrote Unix kernel memory management for real-time multiprocessor hardware (Concurrent Computer Corp.)

  • Wrote Linux device drivers to control telephone interface hardware (Bell Labs)

Admin

• Installed and administered hundreds of Linux systems

  • Linux admin since 1993 pre-version 1.0, contributor to XFree86

• Redhat RHEL (legacy)

• Ubuntu/Debian

• Arch (current)

• Gentoo (legacy)

Virtualization

• Virtualbox

• KVM and Qemu (current)

• VMWare (legacy)

Software Development

Go

• My favorite systems and general compiled language

  • Especially suited for lean Docker containers

  • Have written many tools for automated tasks too complex for scripts

JavaScript

• React

  • My front-end component framework of choice

  • I love `create-react-app` and Hooks

    • Can hand config Webpack and Babel in a pinch

• Vanilla

  • Familiar with ES2021/ES7

  • Wrote experimental React-like JavaScript webapp using RxJS

  • Wrote nested component function in 14 lines of JavaScript for above

    • github.com/LeslieJohnson/mini-component

  • Worked on Babel JSX parser to output Elements and Attributes directly

• Node

  • Use daily for utility scripts, testing, experimenting with JavaScript

Other

• Bash/sh

• SQL (Joe Celko is my hero)

• HTML/HTML5

• CSS

• Tcl/Tk

• C, C++

• Haskell (and Purescript, a little)

• Python (legacy)

• Groovy (legacy)

• Ruby (legacy)

• eLisp (enough to get Emacs to my liking)

Docker

Familiar with Docker Compose, multi-stage builds, and deployment

Kubernetes

Work in progress

Databases

I'm a developer, not a DB manager, but have installed, administered, programmed:

• Postgresql - for many years

• Oracle - since version 4, but not much lately

• MySQL - not recently

• Sqlite - my current favorite

• Rqlite - fault-tolerant distributed version of Sqlite

I'm pretty good at schema design, queries, etc.

Additional skills

AWS (S3, Lightsail, Route 53)

REST, micro services

RxJS

Networks, routers, switches, sockets, TCP/IP, UDP