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Alexander Zolotarev
MAPS.MEOffline maps of the Planet
Powered by OpenStreetMap and
Maps for iOS and Android
• 40M worldwide downloads
• 10M active monthly users
• <10% from Russia
Works Offline
• Fast renderer
• Search
• Car navigation
• Walking directions
Compact & Detailed
• 35 Mb Moscow
• 38 Mb Novosibirsk Oblast
• 41 Mb Greater London
• 28 Gb the Planet
Open Crowdsourced Data
• Wikipedia is the present of
Encyclopedias
• OpenStreetMap is the future of maps
Make the World Better
• Offline Map Editor
• Contribute back directly to
OpenStreetMap
• Easy to use by your granny
Open Source Code
• Contribution
• Issues & bugs
• Forks and code reuse
• Your code is your CV
• https://github.com/mapsme
Under the Hood: Client
• Unit-tested cross-platform C++ core
• OpenGL 3D renderer
• Search & indexing algorithms
• OSRM routing engine
• Lossy map compression
30 bits / coordinate
170 Mbytes
24 bits / coordinate
112 Mbytes
23 bits / coordinate
105 Mbytes
22 bits / coordinate
95 Mbytes
21 bits / coordinate
84 Mbytes
20 bits / coordinate
73 Mbytes
19 bits / coordinate
56 Mbytes
Under the Hood: Servers
1. Planet data generates in 24 hours
2. Petabyte/month served by cheap CDN
3. Statistics server
4. Interregional routing helper
2016: Offline to Online
• Mobile map Editor
• Better search and style
• Routing for Cyclists
• 100M worldwide installs
• More C++ engineers
Epic Fails
• Push notification in 28 languages
• 4 releases in a week
• Small village as a continent
• APK size > 3G download limit
• Yota partnership
Technical Fails
• Buggy NDK & 3party SDKs
• Uninitialized variables (use Valgrind, Luke!)
• OpenGL Android Zoo
• API from higher OS versions
Team Hackathons
• Focused development
• Team building
• Peer-2-peer feedback
Engineering Experience
• Always use code review (github is the best!)
• Do not merge without LGTM
• Autobuild and autotest every change
Daily Dev Workflow
• Fix master branch compile errors, unit tests, crashes
• Review colleagues code
• Work on your own tasks
Engineering Experience
• Coding Standard is a must (derive from Google)
• Always find the root of the problem
• Easy communication tools
Engineering Experience
• Train marketing to git workflow ;)
• Developers are great localization reviewers
• Git interactive rebase makes your code perfect
Team Experience
• Subscribe developers to support and reviews
• Devs reply to users
• Use top hardware
Team Experience
• Be open with your team
• Promote to propose better solutions than yours
• Share positive and negative feedback
The Beginning.
