# JP (@byjp.me)

Profile: https://sifa.id/p/byjp.me
Headline: I give scale-up CTOs the cheat-codes
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!)

## Experience

- **Principal Development Engineer at blinkbox books** (2012 – 2015)
  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.
- **Staff Software Engineer at Deliveroo** (2017 – 2020)
- **Consultant Principal Engineer at Yomly** (2025 – 2026)
  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.
- **Senior Software Engineer at Deliveroo** (2015 – 2017)
- **Consultant Principal Engineer at Iota Technology** (2025 – present)
  Building the data processing pipeline for their Io-1 global magnetic field measurement satellite.
  https://data.iota-technology.com/
- **Retail IT Specialist / Graduate Management Scheme at Tesco** (2010 – 2012)
- **Senior Staff Engineer at Deliveroo** (2017 – 2022)
- **Principal Engineer at Deliveroo** (2022 – 2024)
  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)…
- **Principal at Inflection Engineering** (2025 – present)
  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.

## Education

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

## Skills

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

## Publications

- Atproto markup for HTML — byjp.leaflet.pub (https://byjp.leaflet.pub/3mmltnsb45s2n)
- Slay the Spire 2: Atmosphere edition — byjp.leaflet.pub (https://byjp.leaflet.pub/3mjoiolfzbk2l)
- Mental Poker on atproto — byjp.leaflet.pub (https://byjp.leaflet.pub/3mivrl5vhkk25)
- An every day 'Every Day Calendar' — www.byjp.me (https://www.byjp.me/posts/everyday-calendar)
- Arc: a new browser — www.byjp.me (https://www.byjp.me/posts/arc-new-browser)
- Einstein's Dreams — www.byjp.me (https://www.byjp.me/posts/reviews/books/alan-lightman/einsteins-dreams)
- Accelerando (Singularity) — www.byjp.me (https://www.byjp.me/posts/reviews/books/charles-stross/accelerando-singularity)
- The Human Division — www.byjp.me (https://www.byjp.me/posts/reviews/books/john-scalzi/the-human-division)
- Intrusion — www.byjp.me (https://www.byjp.me/posts/reviews/books/ken-macleod/intrusion)
- 2312 — www.byjp.me (https://www.byjp.me/posts/reviews/books/kim-stanley-robinson/2312)
- The Extra Mile — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/the-extra-mile)
- REST and how to do it right — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/rest-and-how-to-do-it-right)
- Pretty JSON in the terminal — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/pretty-json-in-the-terminal)
- Thoughts on storing passwords — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/thoughts-on-storing-passwords)
- Ruby and Jenkins — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/ruby-and-jenkins)
- It's a Good Day for this film to Die Hard — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/die-hard)
- mini_magic and Apache Passenger — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/mini-magic-apache-passenger)
- Speakable web links — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/speakable-web-links)
- Consider Phlebas — www.byjp.me (https://www.byjp.me/posts/reviews/books/iain-m-banks/consider-phlebas)
- Incidences — www.byjp.me (https://www.byjp.me/posts/reviews/books/daniil-kharms/incidences)
- QED: The Strange Theory of Light and Matter — www.byjp.me (https://www.byjp.me/posts/reviews/books/richard-p-feynman/qed-the-strange-theory-of-light-and-matter)
- Ready Player One — www.byjp.me (https://www.byjp.me/posts/reviews/books/ernest-cline/ready-player-one-ready-player-one-1-)
- Crunch boxes — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/crunch-boxes)
- Sourcery — www.byjp.me (https://www.byjp.me/posts/reviews/books/terry-pratchett/sourcery)
- Pottymouth — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/pottymouth)
- Blinkers — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/blinkers)
- Thimblr — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/thimblr)
- Project Prime, Completed! — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/project-prime-complete)
- Sweet idea — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/sweet-idea)
- Project Prime — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/project-prime)
- Playgrub Love — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/playgrub-love)
- Podcasting your favourite tracks without copyright worries — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/podcasting-and-copyright)
- It's been a while… — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/its-been-a-while)
- Reinterpretation (Chapter 1) — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/reinterpretation-chaptger-1)
- Unexpectedly popular photo — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/unexpectedly-popular-photo)
- Geo Tumblr — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/geo-tumblr)
- Premium economy — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-20-premium-economy)
- In-Flight Frolics — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-20-in-flight-frolics)
- Sayounara Japan — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-20-sayounara-japan)
- Connections — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-20-connections)
- Silly photos — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-18-silly-photos)
- Fancy lobby — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-18-fancy-lobby)
- Night Buses Are Stupid (but actually really clever) — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-15-night-buses-are-stupid-but-actually-really-clever)
- Women-only carriages — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-15-women-only-carriages)
- Umbrellas — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-14-umbrellas)
- Castle shrine — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-14-castle-shrine)
- Hiroshima Today — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-13-hiroshima-today)
- ナンプレ — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-12-nanpure)
- Stolen towels — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-12-stolen-towels)
- Victory: Britain — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-09-victory-britain)
- National pride — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-09-national-pride)
- Nagoya & into Kyoto — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-08-nagoya-into-kyoto)
- Capsule hotel pics — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-07-capsule-hotel)
- The Longest Day — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-06-the-longest-day)
- [All!] Photos being uploaded — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-06-all-photos-uploaded)
- Japanese computers — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-06-)
- Fuji-san — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-06-fuji-san)
- Late Posts — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-06-late-posts)
- Quick Update — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-06-quick-update)
- てのゆ おんせん — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-05-tenyou-onsen)
- JK in the massage chair — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-05-jk-massage-chair)
- English T-Shirts — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-05-english-t-shirts)
- A Long Day — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-04-a-long-day)
- Day 2 — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-03-day-2)
- A Crazily Busy First Day! — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-02-a-crazily-busy-first-day)
- Downhill slope — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-02-quote-post)
- Ciccadas — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-02-ciccadas)
- 6 Hour Sunset — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-01-6-hour-sunset)
- Hostels Shmostels — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-01-hostels-shmostels)
- He knows the score — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-08-01-he-knows-the-score)
- 12 Hour Flight Blues — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-07-31-12-hour-flight-blues)
- Sunset at home — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-07-29-sunset-at-home)
- Facebook API Niggle — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/facebook-api)
- Japanese currency! — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-07-28-photo-post)
- Preparation — www.byjp.me (https://www.byjp.me/posts/tumblr-jpinjapan/2009-07-21-preparation)
- It's Okay — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/kids-with-sticks)
- get_iplayer - it rocks — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/get-iplayer)
- Helix [Cy Densham] — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/helix)
- Time flies — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/time-flies)
- Hot weather pleasure — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/hot-weather-pleasure)
- Hey Google — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/google-car)
- Bad Rounded Profile Pics! — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/bad-rounded-profile-pics)
- SlyPIs out in the wild — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/slypis-out-in-the-wild)
- Twitter links in Tumblr — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/twitter-links-in-tumblr)
- How Developers' Minds Work — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/how-developers-brains-work)
- Short lived — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/short-lived)
- bygone [Cy Densham] — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/bygone-cy-dendsham)
- Ruby-DLC on Github — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/ruby-dlc-on-github)
- Porting to Ruby — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/porting-to-ruby)
- CampusBot — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/campus-bot)
- Where on the Web gets better! — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/where-on-the-web-gets-better)
- Where on the Web screencast — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/where-on-the-web-screencast)
- Where on the Web — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/where-on-the-web)
- Processing and Ruby — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/processing-and-ruby)
- Fire poi — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/poi)
- Low-cost sensing with LEDs — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/low-cost-sensing-with-leds)
- Timelapse video — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/timelapse)
- Video snippet ideas — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/video-snippet-ideas)
- Native ruby RAR — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/native-ruby-rar-archive-extractor)
- Trash files in Ruby — www.byjp.me (https://www.byjp.me/posts/tumblr-musings/trash-files-in-ruby)

## Languages

- Spanish (elementary)

## Other profiles

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