Ansley  Krajcik

Ansley Krajcik

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Talking Kotlin #100 Kotlin at DoorDash

Learn more about how DoorDash uses Kotlin: https://blog.jetbrains.com/kotlin/2020/12/doordash-building-scalable-backend-services-with-kotlin/

Read the story of DoorDash’s migration from Python to Kotlin for their backend: https://doordash.engineering/2021/05/04/migrating-from-python-to-kotlin-for-our-backend-services/

DoorDash, the last-mile logistics company, is going all-in with Kotlin. While most people may recognize them for their food delivery offerings, DoorDash also provides delivery services for businesses.

Matt Anger, Senior Staff Engineer at DoorDash, walks us through how they have embraced Kotlin on Android, their server-side backend services, migrating away from their previous monolithic implementation, and going all in with Kotlin as DoorDash’s language of choice.

Matt tells us the story of why the DoorDash team chose Kotlin, first for Android and then for all of their services. In short, they needed a language that could scale with the company and its growing number of requests per second, and one that offered high developer productivity without sacrificing performance. Interoperation with the JVM and Java ecosystems played a big role, too, as it allowed the team to immediately reuse their integration with Cassandra, Postgres, and Kafka.

We discuss the move from Python to Kotlin, and how the team embraced the new language and the concepts that come with it – from DoorDash’s lunch-and-learns to collecting best practices and using tool support such as linters like ktlint to help their engineers write quality software in Kotlin.

Matt also briefly talks about KrotoPlus (https://github.com/marcoferrer/kroto-plus) and Protokruft (https://github.com/daviddenton/protokruft) for facilitating remote procedure calls (RPC) with Kotlin and Protobuf, and explains DoorDash’s approach to structuring their services and the different server-side technologies they employ: Spring, Micronaut, and GRPC/Netty & Co, as well as LINE’s Armeria framework for building new services (https://github.com/line/armeria).

We also get an overview of how DoorDash overcame some of the challenges they faced when moving to a new ecosystem, along with answers to a variety of other questions.

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Check out other episodes of the Talking Kotlin Podcast → https://youtube.com/playlist?list=PLlFc5cFwUnmz1TwkP9SKCHU978dqLTANB

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Talking Kotlin #100 Kotlin at DoorDash

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Apps like DoorDash, UberEats, etc., have gained a massive market presence. Are you an entrepreneur aspiring to launch an app like DoorDash? If so, you need to know the different income-generating sources of a DoorDash clone app to keep your business afloat. Let’s discuss them here.

Paid commissions: The platform owner receives a percentage of every payment made via the platform as paid commissions. Restaurants give up these charges as the food delivery app helps them reach out to potential customers.

Delivery charges: This revenue model is vital to consider while initiating your DoorDash app development. Customers who enjoy doorstep deliveries give up delivery charges during the final payment.

Subscription fees: Subscriptions are a great way to build a loyal customer base. You can roll out subscription plans with enticing benefits that customers can avail of either monthly or yearly. These charges add to your income tally as well.

In-app ad charges: All you have to do is collaborate with third-party ad brands. By displaying their ads on your site, you can levy charges based on clicks, views, impressions, etc.

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