Henry Allen

Sample

Senior Engineering Manager at Denholm Group · Mobile apps · MVVM, Android performance

Denholm Group
London, UK · GMT (UTC+0)
10+ years experience
University of Manchester
English
Messaging unavailable

Overview

Based in London. I lead mobile apps at Denholm Group. Mentored 15 engineers through their first promotion. Before that: Standard Chartered and AstraZeneca. Most at home with Kotlin and Jetpack Compose. Swimming before work keeps me sane.

Good reasons to reach out
  • Questions about mobile apps
Please don't message about
  • Agency or outsourcing pitches
  • Crypto token projects

Prefers short, specific messages

Skills
Jetpack ComposeKotlinGradleMVVMCoroutinesAndroid performance

Experience

  1. Senior Engineering Manager
    Aug 2024 - Present
    Denholm Group · 2 yr 2 mo · Full-time · London, UK
    • Led the migration of 26 services to Jetpack Compose.
    • Shipped a rewrite that took build times from 40 minutes to under 2.
    • Mentored 7 engineers through their first promotion.
  2. Senior Android Engineer
    Jun 2023 - Aug 2024
    Standard Chartered · 1 yr 2 mo · Full-time · London, UK
    • Shipped 14 launches on the Android team without a rollback.
  3. Senior Android Engineer
    Feb 2021 - Jun 2023
    AstraZeneca · 2 yr 4 mo · Contract · London, UK
    • Reduced cloud spend on Android by 31% in two quarters.
    • Cut p99 latency on the Android services from 361ms to 145ms.
  4. Staff Android Engineer
    Dec 2019 - Feb 2021
    Bank of Ireland · 1 yr 2 mo · Full-time · London, UK
    • Cut cold-start time on low-end Android phones by 36%.
    • Shipped a rewrite that took build times from 18 minutes to under 3.
  5. Senior Android Engineer
    Jul 2016 - Dec 2019
    Sky · 3 yr 5 mo · Full-time · London, UK
    • Cut cold-start time on low-end Android phones by 51%.
    • Wrote the Coroutines service that now handles 11 million requests a day.

Projects

Open-source Jetpack Compose toolkit
2025

A small library for mobile apps that 191 developers star on GitHub.

Mobile apps benchmark
2024

Reproducible benchmarks comparing Gradle and Android performance on real workloads.

References

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Education

  1. University of Manchester
    BSc, Computer Engineering
    2005 - 2008

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