# JP (@byjp.me)

Profile: https://sifa.id/p/byjp.me
Headline: I help scale-up CTOs with hard-won cheat codes for calm during growth
Website: https://github.com/jphastings

## About

I make things! Deliveroo’s ex-Principal Engineer, atproto builder, and newly promoted to Father of a Daughter 😍 (wish me luck!)

## Career

- **Principal at Inflection Engineering** (Jan 2025 - Present)
  Self-employed · Hybrid
  My consultancy duo, bringing decades of rapid tech scale-up tech & org knowledge to early-life CTOs who’ve become the victim of their own success, and need time more than anything else.
- **Consultant Principal Engineer at Iotatechnology.com** (Jun 2025 - Present)
  Contract
  Designing & building ground-side software systems for Io-1: global magnetic field measurement satellite system.
  
  https://data.iotatechnology.com/
- **Consultant Principal Engineer at Yomly** (Jan 2025 - Apr 2026)
  Contract · Remote
  Growing the engineering team 2x, building automated and human processes to bring ~50 microservice ecosystem up to a highly observable and maintainable standard, supporting my newly hired Director, Senior Engineering manager & Staff engineers during ramp-up, cost saving & system simplification.
- **Principal Engineer at Deliveroo** (Mar 2022 - Apr 2024)
  Full-time · London, England, GB · Hybrid
  Supporting Deliveroo's IPO (technical, security, platform), multiple funding rounds, technical interviewing & levels/expectation frameworks, long-term engineering culture, and mentor to senior staff engineers. Engineering projects included distributed feature flagging & experimentation systems, architectural resilience (blast radius reduction across ~150 microservices)…
- **Senior Staff Engineer at Deliveroo** (Jul 2017 - Mar 2022)
- **Staff Software Engineer at Deliveroo** (Jul 2017 - Jul 2020)
- **Senior Software Engineer at Deliveroo** (May 2015 - Jul 2017)
- **Principal Development Engineer at Blinkbox Books** (Dec 2012 - Mar 2015)
  Full-time · London, England, GB · On-site
  Built & maintained book ingestion systems, daily imports of ~2 million books and metadata from 20+ publishing houses at various stages of supporting digital books, including ePub transformation.
- **Retail IT Specialist / Graduate Management Scheme at Tesco** (Aug 2010 - Dec 2012)
  Full-time · On-site

## Publications

- Disassembling the Kodak Charmera — byjp.pckt.blog (Aug 2026) https://byjp.pckt.blog/disassembling-the-kodak-charmera-psk3fky
- Atproto markup for HTML — byjp.leaflet.pub (May 2026) https://byjp.leaflet.pub/3mmltnsb45s2n
- Slay the Spire 2: Atmosphere edition — byjp.leaflet.pub (Apr 2026) https://byjp.leaflet.pub/3mjoiolfzbk2l
- Mental Poker on atproto — byjp.leaflet.pub (Apr 2026) https://byjp.leaflet.pub/3mivrl5vhkk25
- An every day 'Every Day Calendar' — www.byjp.me (Feb 2026) https://www.byjp.me/posts/everyday-calendar
- Arc: a new browser — www.byjp.me (Jun 2023) https://www.byjp.me/posts/arc-new-browser
- ナンプレ — www.byjp.me (Aug 2009) https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-12-nanpure
- Stolen towels — www.byjp.me (Aug 2009) https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-12-stolen-towels
- Victory: Britain — www.byjp.me (Aug 2009) https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-09-victory-britain
- National pride — www.byjp.me (Aug 2009) https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-09-national-pride
- Nagoya & into Kyoto — www.byjp.me (Aug 2009) https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-08-nagoya-into-kyoto
- Capsule hotel pics — www.byjp.me (Aug 2009) https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-07-capsule-hotel
- The Longest Day — www.byjp.me (Aug 2009) https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-06-the-longest-day
- [All!] Photos being uploaded — www.byjp.me (Aug 2009) https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-06-all-photos-uploaded
- Japanese computers — www.byjp.me (Aug 2009) https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-06-
- Fuji-san — www.byjp.me (Aug 2009) https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-06-fuji-san
- Late Posts — www.byjp.me (Aug 2009) https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-06-late-posts
- Quick Update — www.byjp.me (Aug 2009) https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-06-quick-update
- てのゆ おんせん — www.byjp.me (Aug 2009) https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-05-tenyou-onsen
- JK in the massage chair — www.byjp.me (Aug 2009) https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-05-jk-massage-chair
- English T-Shirts — www.byjp.me (Aug 2009) https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-05-english-t-shirts
- A Long Day — www.byjp.me (Aug 2009) https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-04-a-long-day
- Day 2 — www.byjp.me (Aug 2009) https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-03-day-2
- A Crazily Busy First Day! — www.byjp.me (Aug 2009) https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-02-a-crazily-busy-first-day
- Downhill slope — www.byjp.me (Aug 2009) https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-02-quote-post
- Ciccadas — www.byjp.me (Aug 2009) https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-02-ciccadas
- 6 Hour Sunset — www.byjp.me (Aug 2009) https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-01-6-hour-sunset
- Hostels Shmostels — www.byjp.me (Aug 2009) https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-01-hostels-shmostels
- He knows the score — www.byjp.me (Aug 2009) https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-01-he-knows-the-score
- 12 Hour Flight Blues — www.byjp.me (Jul 2009) https://www.byjp.me/posts/tumblr-jpinjapan/2009-07-31-12-hour-flight-blues
- Sunset at home — www.byjp.me (Jul 2009) https://www.byjp.me/posts/tumblr-jpinjapan/2009-07-29-sunset-at-home
- Facebook API Niggle — www.byjp.me (Jul 2009) https://www.byjp.me/posts/tumblr-musings/facebook-api
- Japanese currency! — www.byjp.me (Jul 2009) https://www.byjp.me/posts/tumblr-jpinjapan/2009-07-28-photo-post
- Preparation — www.byjp.me (Jul 2009) https://www.byjp.me/posts/tumblr-jpinjapan/2009-07-21-preparation
- It's Okay — www.byjp.me (Jul 2009) https://www.byjp.me/posts/tumblr-musings/kids-with-sticks
- get_iplayer - it rocks — www.byjp.me (Jul 2009) https://www.byjp.me/posts/tumblr-musings/get-iplayer
- Helix [Cy Densham] — www.byjp.me (May 2009) https://www.byjp.me/posts/tumblr-musings/helix
- Time flies — www.byjp.me (May 2009) https://www.byjp.me/posts/tumblr-musings/time-flies
- Hot weather pleasure — www.byjp.me (May 2009) https://www.byjp.me/posts/tumblr-musings/hot-weather-pleasure
- Hey Google — www.byjp.me (May 2009) https://www.byjp.me/posts/tumblr-musings/google-car
- Bad Rounded Profile Pics! — www.byjp.me (May 2009) https://www.byjp.me/posts/tumblr-musings/bad-rounded-profile-pics
- SlyPIs out in the wild — www.byjp.me (May 2009) https://www.byjp.me/posts/tumblr-musings/slypis-out-in-the-wild
- Twitter links in Tumblr — www.byjp.me (May 2009) https://www.byjp.me/posts/tumblr-musings/twitter-links-in-tumblr
- How Developers' Minds Work — www.byjp.me (May 2009) https://www.byjp.me/posts/tumblr-musings/how-developers-brains-work
- Short lived — www.byjp.me (May 2009) https://www.byjp.me/posts/tumblr-musings/short-lived
- bygone [Cy Densham] — www.byjp.me (May 2009) https://www.byjp.me/posts/tumblr-musings/bygone-cy-dendsham
- Ruby-DLC on Github — www.byjp.me (May 2009) https://www.byjp.me/posts/tumblr-musings/ruby-dlc-on-github
- Porting to Ruby — www.byjp.me (May 2009) https://www.byjp.me/posts/tumblr-musings/porting-to-ruby
- CampusBot — www.byjp.me (Apr 2009) https://www.byjp.me/posts/tumblr-musings/campus-bot
- Where on the Web gets better! — www.byjp.me (Apr 2009) https://www.byjp.me/posts/tumblr-musings/where-on-the-web-gets-better
- Where on the Web screencast — www.byjp.me (Apr 2009) https://www.byjp.me/posts/tumblr-musings/where-on-the-web-screencast
- Where on the Web — www.byjp.me (Apr 2009) https://www.byjp.me/posts/tumblr-musings/where-on-the-web
- Processing and Ruby — www.byjp.me (Apr 2009) https://www.byjp.me/posts/tumblr-musings/processing-and-ruby
- Fire poi — www.byjp.me (Apr 2009) https://www.byjp.me/posts/tumblr-musings/poi
- Low-cost sensing with LEDs — www.byjp.me (Apr 2009) https://www.byjp.me/posts/tumblr-musings/low-cost-sensing-with-leds
- Timelapse video — www.byjp.me (Mar 2009) https://www.byjp.me/posts/tumblr-musings/timelapse
- Video snippet ideas — www.byjp.me (Mar 2009) https://www.byjp.me/posts/tumblr-musings/video-snippet-ideas
- Native ruby RAR — www.byjp.me (Mar 2009) https://www.byjp.me/posts/tumblr-musings/native-ruby-rar-archive-extractor
- Trash files in Ruby — www.byjp.me (Mar 2009) https://www.byjp.me/posts/tumblr-musings/trash-files-in-ruby

## Skills

### Technical
- AT Protocol
- AWS
- Continuous Integration
- Continuous Integration and Continuous Delivery (CI/CD)
- CouchDB
- go
- GraphQL
- HTML
- JavaScript
- pandas
- Python
- React
- React.js
- Ruby
- Ruby on Rails
- Scala
- Software Development
- Software Development Life Cycle (SDLC)
- TypeScript
### Business
- Management
- Project Management
- Scrum
### Creative
- Digital Publishing
### Interpersonal
- Cross-functional Leadership
- Leadership
- Mentoring
- Public Speaking
- Team Leadership
### Other
- Competency Based Interviewing
- Computer Science
- Database Design
- Lindy Hop
- ONIX
- pants
- Physics
- Software Engineering Practices
- Swing Dance

## Education

- **University of Nottingham** — MSci, Physics (Sep 2006 - Jun 2010)

## Languages

- Spanish (elementary)

## Links

- other: https://github.com/jphastings
- other: https://linkedin.com/in/jphastings
- discord: https://discord.com/users/690973862245957683
- steam: https://steamcommunity.com/profiles/76561197994000231
- dns: https://byjp.biz