Callum Stewart

S

Director of Engineering · Platform engineering · Bazel

Booking.com
Cambridge, UK · GMT (UTC+0)
12+ years experience
University of Cambridge
English
AdvisingOpen to work
Messaging unavailable

Overview

I've spent 20 years on platform engineering - first at HSBC, now at Booking.com. Reduced cloud spend on developer platform by 21% in two quarters. Most at home with Bazel and service mesh. Jazz piano, badly.

Good reasons to reach out
  • Roles in platform engineering
  • Advice on platform engineering
  • Speaking or podcast invitations
Please don't message about
  • Unpaid work or spec projects
  • Offshore staffing offers
  • Agency or outsourcing pitches

Checks messages twice a week

Skills
service meshBazelBackstageKubernetes
AdvisingOpen to advising
closes in 3 months

Open to advising pre-seed teams on service mesh

Topics
platform engineering, Bazel, service mesh
Format
Office hours
Terms
Equity
Capacity
One call a month
Best for
Seed to Series A teams

20 years of platform engineering. Small equity or paid hours - flexible.

Cambridge, UKkubernetesbazelservice mesh
Open
Open to workLooking for a role
closes in 3 months

Next role: Platform Engineer in climate tech, Cambridge or hybrid

Target roles
Platform Engineer
Level
Mid
Industries
Climate tech, Logistics
Work mode
Hybrid
Available
90 days notice
Work authorization
Authorized to work in the UK
What I'm looking for
Hands-on work on Backstage with room to mentor.
Not interested in
Crypto

20 years in platform engineering. Strongest at Kubernetes and Bazel. Open to the right conversation.

Cambridge, UKkubernetesbazelbackstage
Open

Experience

  1. Director of Engineering
    Mar 2023 - Present
    Booking.com · 3 yr 7 mo · Full-time · Cambridge, UK
    • Built the experimentation framework 19 product teams use to ship changes safely.
    • Mentored 5 engineers through their first promotion.
    • Reduced cloud spend on developer platform by 31% in two quarters.
  2. Engineering Manager
    Mar 2021 - Dec 2022
    Intercom · 1 yr 9 mo · Full-time · Cambridge, UK
    • Mentored 10 engineers through their first promotion.
  3. Platform Engineer
    Oct 2017 - Dec 2020
    EY · 3 yr 2 mo · Contract · Cambridge, UK
    • Shipped a rewrite that took build times from 18 minutes to under 5.
  4. Senior Engineering Manager
    Jul 2016 - Oct 2017
    Boston Consulting Group · 1 yr 3 mo · Full-time · Cambridge, UK
    • Cut p99 latency on the developer platform services from 591ms to 73ms.
  5. Senior Engineering Manager
    Feb 2015 - Jul 2016
    HSBC · 1 yr 5 mo · Full-time · Cambridge, UK
    • Wrote the Kubernetes service that now handles 4 million requests a day.

References

No references yet.

Education

  1. University of Cambridge
    BA, Computer Science
    2003 - 2006

Details

Compensation expectations
What they are targeting for their next role.
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