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Mohit Sarveiya Building Android Infra Teams at Scale @heyitsmohit

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Building Android Infra Teams at Scale ● Purpose & Motivations ● How to build an infra team ● Best practices

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What is an Android Infra Team? ● Focuses on Arch, CI and Tooling ● Customers are devs.

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Motivations Team 
 Size Complexity

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Greenfield Phase ● Small team size ● Iterate quickly ● Minimal processes

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Motivations Team 
 Size Complexity

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Scaling Up ● Larger team ● Developer Experience ● Tooling

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Scaling Problems ● Gradle build setup & build times

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Scaling Problems Teams Monorepo

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Scaling Problems Monorepo Gradle

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Gradle Setup ● 100+ Gradle Modules ● Gradle Plugins (KAPT) ● Library Dependencies

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Scenario ● Upgrade Gradle Plugin

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Scenario ● Upgrade Gradle Plugin ● Causes Out of Memory Exception

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Scenario ● Upgrade Gradle Plugin ● Causes Out of Memory Exception ● Effects whole team (Slows down development)

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Motivations for Infra ● Need to maintain Gradle setup ● Detect build regression

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Scaling Problems ● Gradle build setup & build times ● Architecture Fragmentation

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Scaling Problems Codebase

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Scaling Problems Codebase Legacy code

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Arch Fragmentation ● Legacy Architecture ● Example - MVC/MVP ● Older design patterns

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Arch Fragmentation Codebase Legacy code Feature A

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Arch Fragmentation Codebase Legacy code Feature A Feature B

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Motivations for Infra ● Uniform app arch ● Specify how to migrate legacy arch

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Building Infra Team

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Team Charter ● Ownership areas

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Ownership Areas ● Architecture ● Shared Libraries ● Build tools (Gradle, Buck, Basel) ● CI

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Ownership Areas Team 
 Size Complexity 100+

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Ownership Areas Infra Org

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Ownership Areas Infra Org CI Arch Dev Ex Build Tools Teams

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Ownership Areas Team 
 Size Complexity 30+

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Ownership Areas Infra Org Single Team (CI, Arch, Build Tools) Teams

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Challenges ● Diverse skill set

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CI ● How to build pipelines ● Jenkins or CircleCI ● Setting up automation

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Challenges ● Diverse skill set ● Prioritizing

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Ownership Areas ● Architecture ● Shared Libraries ● Build tools (Gradle, Buck, Basel) ● CI

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Team Charter ● Ownership areas ● Key Performance Indicators (KPIs)

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Key Performance Indicators (KPIs) ● Service Level Objectives

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Service Level Objectives ● Build times ● Infra for performance metrics ● Infra for network metrics

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Service Level Objectives Codebase Feature A Feature B Feature C

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Scenario 9:41 ● Scroll performance ● Network Latency

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Service Level Objectives Platform Monitoring

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Team Charter ● Ownership areas ● Key Performance Indicators (KPIs) ● Objectives and key results

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Objectives & Key Results (OKRs) ● Top down approach ● Bottom up approach

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Objectives & Key Results (OKRs) ● Determine important problems to solve ● Prioritize

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Team Surveys ● Challenges ● Build times ● Architecture ● Testing

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Building Roadmap Team survey OKRs & Priotrize projects Execute

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Examples OKRs ● Improve local build times by 10% ● Reduce onboarding to 10th commit ● Refactor navigation

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Team Charter ● Ownership areas ● Key Performance Indicators (KPIs) ● Objectives and key results

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Best Practices

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Best practices ● Feedback

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Acquisitions Feature Teams Infra Team Continous 
 Feedback

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Acquisitions Improvement POC Details Serialization Performance Feature Team A Feature Team B

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Planning Review acquisitions Priortrize/Plan Setup Roadmap

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Bi-Weekly Updates Feature Teams Infra Team Digests

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Bi-Weekly Digests ● Project Status ● Improvements ● Infra Asistance

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Example ● Improved Gradle build times by 10% ● Created tools to improve dev workflow ● Assisted in project

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Best practices ● Feedback ● Expectations

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OKRs ● Not every OKR can have a metric

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OKRs ● Not every OKR can have a metric ● Continuous team survey feedback

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Best practices ● Feedback ● Expectations ● Setup processes for using new tech

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Introducing New Libraries Request for Comments Proposal

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Introducing New Libraries Request for Comments Proposal Reviewed by Infra

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Introducing New Libraries Request for Comments Proposal Reviewed by Infra Approval & Follow up

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Best practices ● Feedback ● Expectations ● Setup processes for infra ● Automate best practices

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Automate Best Practices ● Static Code Analysis ● Custom lint rules

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Best practices ● Feedback ● Expectations ● Setup processes ● Automate best practices ● Open source libraries

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Open source libraries Team B Team A Team C Distribute ownership

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Open source libraries Team B Team A Team C Distribute ownership SDK

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Open Source libraries (Infra ownership) ● Gradle tools ● Custom Lint repo ● Arch frameworks

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Open Source libraries ● Prioritize OSS issues in planning ● Setup milestones for releases

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Best practices ● Feedback ● Expectations ● Setup processes for new tech ● Automate best practices ● Open source libraries

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Building Android Infra Teams at Scale ● Purpose & Motivations ● How to build an infra team ● Best practices

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Thank You! www.codingwithmohit.com @heyitsmohit