Hello, I'm

James Coggan

Senior Android Engineer & Engineering Manager

25+ years shipping software at scale.
Meta, Google Developer Expert, American Express.

Available for remote contract work · Seville, Spain

About Me

James Coggan

Senior Android engineer with 12+ years of mobile experience, including 2.5 years at Meta working on infrastructure that served 1 billion daily test executions.

Former Google Developer Expert (IoT). Proven track record at scale — from architecture and delivery to CI/CD, team leadership, and engineering manager roles at Meta and American Express.

Location Seville, Spain
Experience 25+ Years
Availability Remote Contract

Experience

Engineering Manager

Welltech

February 2025 – Present · Remote, Spain

  • Improved Android crash-free sessions rate from 98% to 99.9% — 10x reduction in user-facing crashes
  • Scaled test coverage from 50 to 2,000+ tests (40x); introduced screenshot testing
  • Designed and built a custom E2E testing CLI + DSL — same class of tooling built at Meta
  • Reduced delivery time by 66% with fewer bugs through incremental delivery
  • Pioneering AI-assisted engineering workflows to multiply developer output

Senior Software Engineer

Meta Testing Frameworks

April 2021 – November 2024 (3 years 8 months) · Remote / London

  • Reduced Android instrumentation test flakiness by 80%
  • Led migration of Android + iOS screenshot tests to unified infrastructure, cutting capacity usage by 50%
  • Upgraded 1 billion daily Android, iOS, and Chrome tests to latest platform versions
  • Redesigned UI/UX of Meta's primary E2E testing solution for 150k+ weekly test executions
  • Top 3 interviewer in the organisation for H1 2024 (62 behavioural interviews)

Mobile Tech Lead

ParcelChain

January 2023 – January 2024 · Remote, Spain

  • Architected full Android stack from scratch: Kotlin, Jetpack Compose, Coroutine Flow, Circuit (Slack)
  • Integrated GPS, gRPC, REST (Retrofit), Room, DI (Dagger/Hilt)
  • Full test coverage: instrumentation tests, JUnit, mocking

Google Developer Expert

Google IoT

March 2018 – May 2022 · London

  • Selected by Google for outstanding expertise in developer technologies
  • Represented Google at Droidcon Tel Aviv, GDG DevFest Kansas City, GDG DevFest Minneapolis, GDG London
  • Mentored developers globally on Android and IoT platforms

Engineering Manager

American Express

June 2018 – April 2021 · London

  • Led mobile engineering team delivering Android and iOS apps to 21 global markets
  • Redesigned team processes, increasing delivery efficiency by 300% while reducing bug ratio by 75%
  • Mentored engineers; drove cross-functional collaboration across engineering, design, and product

Mobile Engineering Manager & Android Tech Lead

MyDrive Solutions

June 2015 – June 2018 · London

  • Set up entire mobile CI/CD pipeline on Bitrise from scratch
  • Led architectural redesign of mobile apps
  • Transitioned mobile development in-house

Skills & Expertise

Android

Kotlin Jetpack Compose Coroutines/Flow gRPC Retrofit Room Dagger/Hilt

Testing

Android Instrumentation JUnit Espresso Screenshot Testing E2E DSLs

Infrastructure

CI/CD Bitrise Custom Pipelines Git Test Infra at Scale

Leadership

Engineering Manager Tech Lead Hiring & Interviewing Mentoring

AI-Assisted Engineering

Workflow Automation AI Coding Tools Developer Productivity

Notable Achievements

🏆

1 Billion Daily Tests

Built infrastructure serving 1B+ daily test executions at Meta

🔧

80% Flakiness Reduction

Eliminated test flakiness for thousands of Meta engineers

📱

2M+ Downloads

MadTeam Android ROM: largest community for the device (2M+ downloads)

🎯

Google Developer Expert

Selected by Google, spoke at international developer conferences

👥

300% Efficiency Gain

Redesigned delivery process at American Express

🤖

AI Pioneer

Building AI-assisted workflows; leveraging AI to multiply team output

Let's Work Together

Available for Remote Contract, Senior Android Engineering, Engineering Manager, and Fractional CTO roles.

Get in Touch on LinkedIn