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Cheapass.in — presented at JSFoo 2016
- 1. Cheapass.in
- 2. Aakash Goel
- 4. Aakash Goel @aakashlpin I ❤ WEB
- 6. a price drop alert service
- 7. a price drop alert service launched Jun 14
- 8. a price drop alert service launched Jun 14 chief-do-it-all
- 9. Numbers
- 11. Numbers ~5000 active users >30,000 products tracked
- 12. Numbers ~5000 active users >5,00,000 price drop alerts >30,000 products tracked
- 13. Numbers 10,00,000 saved ~5000 active users >5,00,000 price drop alerts >30,000 products tracked
- 16. Avg. Commission = 4.85% Earning Report from
- 17. made it to
- 18. made it to
- 19. made it to
- 20. made it to
- 21. appreciated by
- 22. appreciated by
- 23. appreciated by
- 24. appreciated by
- 25. appreciated by
- 26. appreciated by
- 27. appreciated by
- 28. appreciated by
- 29. tech / thanks to OSS
- 30. tech / thanks to OSS
- 31. learnings
- 32. learnings while maintaining the servers 5
- 33. 1.
- 35. the dynamic `require` dynamic = loading a module at function execution time
- 36. the dynamic `require` dynamic = loading a module at function execution time static = loading a module at node process startup
- 39. the dynamic `require` Call this function 1025 times in a `for` loop on a unix machine
- 40. the dynamic `require` Call this function 1025 times in a `for` loop on a unix machine default `ulimit` = 1024 (simultaneous open files on a unix machine)
- 42. the dynamic `require` is a terrible idea at scale* https://gist.github.com/aakashlpin/0c14cb41f34ae00d8f98019f85d78c9a
- 43. 2.
- 44. the curious case of db schema
- 45. the curious case of db schema
- 46. the curious case of db schema
- 47. the curious case of db schema Array
- 48. the curious case of db schema Array as
- 49. the curious case of db schema Array as an updatable
- 50. the curious case of db schema Arrays as document an updatable
- 51. the curious case of db schema Array as document value an updatable
- 52. the curious case of db schema Array as updatable document value IS A BAD IDEA
- 53. the curious case of db schema insertion, updation, aggregation with Arrays doesn’t scale
- 54. the curious case of db schema
- 55. the curious case of db schema Creating multiple documents
- 56. the curious case of db schema Creating multiple documents 👍
- 57. the curious case of db schema Creating multiple documents 👍 Updating an existing document
- 58. the curious case of db schema Creating multiple documents 👍 Updating an existing document 👎
- 59. the curious case of db schema #randomgyaan it’s okay to have bad schema designs to begin with scale teaches you a lot of things
- 60. 3.
- 61. processing data (stored in a database)
- 62. processing data (stored in a database)
- 63. processing data (stored in a database)
- 64. processing data (stored in a database)
- 65. .find() => copies all results in memory processing data (stored in a database)
- 66. processing data (stored in a database)
- 67. processing data (stored in a database)
- 68. .aggregate() => copies computed results processing data (stored in a database)
- 69. processing data (stored in a database)
- 70. pulling data in-memory to process is a terrible idea at scale* https://gist.github.com/aakashlpin/3df846ea39dc6b7472fb3638dae0c60a processing data (stored in a database)
- 71. 4.
- 72. spawn with care
- 73. spawn with care CaptureJS full webpage capture command-line tool with PhantomJS
- 74. spawn with care CaptureJS full webpage capture command-line tool with PhantomJS but what if selector is not present?
- 75. spawn with care NodeJS PhantomJS Inter process communication
- 76. spawn with care NodeJS PhantomJS Inter process communication
- 78. spawn with care is a tricky idea at scale* spawning processes on server
- 79. 5.
- 80. never rely on systems you didn’t build
- 81. never rely on systems you didn’t build cookies request clients don’t send cookies by default
- 82. never rely on systems you didn’t build cookies request clients don’t send cookies by default backends can track that
- 83. never rely on systems you didn’t build cookies request clients don’t send cookies by default backends can track that make 2 requests with the cookie sent in the initial request
- 84. never rely on systems you didn’t build cookies request clients don’t send cookies by default backends can track that make 2 requests with the cookie sent in the initial request also known as the “cookie jar”
- 85. never rely on systems you didn’t build bot captchas patterns while making server to server requests are bad
- 86. never rely on systems you didn’t build bot captchas patterns while making server to server requests are bad backends can track that
- 87. never rely on systems you didn’t build bot captchas patterns while making server to server requests are bad backends can track that request while rotating IPs, Proxies, User-Agents
- 88. never rely on systems you didn’t build bot captchas patterns while making server to server requests are bad backends can track that request while rotating IPs, Proxies, User-Agents avoiding the “honey pot” while crawling
- 89. never rely on systems you didn’t build content security policy servers can whitelist what all script origins can be injected onto the page
- 90. never rely on systems you didn’t build content security policy you’re screwed if that’s enforced servers can whitelist what all script origins can be injected onto the page
- 91. never rely on systems you didn’t build content security policy you’re screwed if that’s enforced if you rely on bookmarklets / extensions servers can whitelist what all script origins can be injected onto the page
- 92. learnings while growing the user base 5
- 93. 6.
- 95. genuinely offer privacy* everyone gets a unique dashboard link
- 96. genuinely offer privacy* everyone gets a unique price tracking link per product everyone gets a unique dashboard link
- 97. genuinely offer privacy* everyone gets a unique price tracking link per product no passwords to crack — OTP only login everyone gets a unique dashboard link
- 98. genuinely offer privacy* everyone gets a unique price tracking link per product no passwords to crack — OTP only login everyone gets a unique dashboard link * and skip the hassles of maintaining security
- 99. 7.
- 100. spam for profit
- 101. spam for profit captured live deals from Amazon, Flipkart etc…
- 102. spam for profit captured live deals from Amazon, Flipkart etc… …in real-time…
- 103. spam for profit captured live deals from Amazon, Flipkart etc… …in real-time… …right before sending…
- 104. spam for profit captured live deals from Amazon, Flipkart etc… …in real-time… …right before sending… …the price drop alert email
- 105. spam for profit Deal from Amazon picked up in real time
- 106. spam for profit Email Delivery Report from Postmark
- 107. spam for profit Email Delivery Report from Postmark 2015
- 108. spam for profit Email Delivery Report from Postmark 2015 ~40% average email open rate
- 109. spam for profit Email Delivery Report from Postmark 2015 ~40% average email open rate is not too bad!
- 110. 8.
- 111. tiny incentives go a long way
- 112. tiny incentives go a long way doled out FreeCharge coupons for people who rage about us on social media
- 113. tiny incentives go a long way doled out FreeCharge coupons for people who rage about us on social media and they did!
- 114. tiny incentives go a long way got in touch with FreeCharge and doled out Rs. 25/- coupons for people who rage about it on social media
- 115. tiny incentives go a long way got in touch with FreeCharge and doled out Rs. 25/- coupons for people who rage about it on social media
- 116. tiny incentives go a long way got in touch with FreeCharge and doled out Rs. 25/- coupons for people who rage about it on social media
- 117. 9.
- 118. creating more clients is easy
- 119. creating more clients is easy /trackUrl/ website bookmarklet Android iOS twitter bot
- 120. creating more clients is easy /trackUrl/ website bookmarklet Android iOS twitter bot same endpoint — consumed by several mainstream clients
- 121. creating more clients is easy one time effort building the iOS app Design + React Native (Components)
- 122. creating more clients is easy Android App wrote itself Design + React Native (Components) 100% reuse >80% reuse
- 123. creating more clients is easy iOS Android
- 124. creating more clients is easy
- 125. 10.
- 126. there’s no perfect product
- 127. there’s no perfect product it’s okay to have outdated libraries
- 128. there’s no perfect product it’s okay to have outdated libraries it’s okay to not build everything you can dream of in first cut
- 129. there’s no perfect product it’s okay to have outdated libraries it’s okay to not build everything you can dream of in first cut it’s great to get feedback and listen to customers
- 130. there’s no perfect product the product has been evolving for over 2 years
- 131. there’s no perfect product the product has been evolving for over 2 years the iOS/Android apps were basic read-only apps to begin with
- 132. there’s no perfect product the product has been evolving for over 2 years the iOS/Android apps were basic read-only apps to begin with build something and ship — you’ll never finish that side project
- 133. just build & ship it