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Warren de Leon

Software Engineering Manager at Hargreaves Lansdown. Leading the Mobile Platform squad, building a React Native app from scratch. Writing about engineering leadership, hiring, and mobile develop

London, United Kingdom Joined on Mar 29, 2026 https://warrendeleon.com/blog/

Work

Software Engineering Manager

May 11

Tiered secure storage in React Native

#reactnative #security #storage #mobilesecurity

8 min read

May 4

Setting up MSW v2 in React Native

#reactnative #testing #mocking #jest

11 min read

Apr 27

I built an app the hiring panel will never open

#engineeringmanagement #hiring #react #internaltools

7 min read

Apr 20

How to write a take-home tech test that candidates actually want to do

#engineeringmanagement #hiring #techinterviews #devrel

7 min read

Apr 13

How I designed a tech test scorecard that works from Graduate to Senior

#engineeringmanagement #hiring #techinterviews

6 min read

Apr 6

How to pass a React Native tech test

#reactnative #hiring #careeradvice

8 min read

Mar 29

Why I redesigned our React Native tech test in my first week

#engineeringmanagement #hiring #reactnative

8 min read

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