Jodel Geomonday 2015.4

Location@Jodel

Agenda

• Whoisthis?• What’sJodel?• Whatlocationchallengesdowehave?

Whoisthis?

• RobertTochman-Szewc• TechLead/JavaScriptDeveloperatJodel• M.Sc.Economics&ComputerScience• Master’sThesis:Reddit andBrands

WhatisJodel?

• Jodel connectseveryonenearby inthemostsimpleway• Thefeedshowsmessages andpictures postedinyourimmediatevicinity• Usersinteractwithcontentvia• Posts• Comments• Up&DownVotes

• Karma rewardsusersforactivityandgoodcontent

WhatisJodel?(2)

• Whereveryougo,yourfeedwillfeeldifferent

Challenges?

• TwoExamples• Challenge1:Analytics• Challenge2:LocationCalculations

MeaningforAnalytics

• Verydifferentuserexperiencesdependingonlocation• (Many)commontoolslackpreciselocationfeatures• OnlybasedonIP• Manyuserswithuncategorizedlocation

• (Possible)lossofinformation

• Solution:Ownanalyticssolutionsfromearlyon

LocationCalculations

• Everydatabasenowadayshasgeo-componentsforqueriesbasedondistance.• That’showwestarted.

LocationCalculations(2)

• Mostoftherequestaregeo-basedones• Databasesizehasincreasedalot• Read/write-locksstartedtobecomemoreandmoreofaproblem• Somethinghadtobedone

Softeningupconstraints

• Tradeoff:Functionalityvs.Efficiency• Findoutwhatmatters• Crucialthingsforuserexperience• Efficiencyimprovementswherenotcrucial

Whatdouserssee(before)?

Whatdouserssee(after)?

Result

• NomoregeocalculationsonDB,allindex-based• Justasefficientasothertypeofsorting• Additionalsynergiesfordomain

Outlook

• Newchallengeseveryday• Smallbutefficientteam• Onemillionusersandgrowing

Thanks!