Software Development Engineer II, Amazon Flex, Capacity Planning

Amazon

Global technology company focused on e-commerce, cloud computing, digital streaming, and artificial intelligence.

Toronto, ON, Canada

Backend

Mid-Level Software Engineer

In-Person

5,000+ Employees

3+ years of experience

Logistics

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Description For Software Development Engineer II, Amazon Flex, Capacity Planning

Amazon Flex is a dynamic global business unit focused on enabling fast delivery speeds and managing business variability through innovative, scalable operations. As a Software Development Engineer II in the Capacity Planning team, you'll work at the intersection of science and technology to predict and manage capacity constraints in Amazon's network. The role involves creating and maintaining services that shape capacity management in Last Mile operations.

You'll be working with a sophisticated tech stack including Java and various AWS services (SNS, SQS, Lambda, DynamoDB, S3, AppConfig, Sagemaker, StepFunctions). The position requires strong backend development skills and an appreciation for test automation. You'll collaborate with cross-functional teams including Operations, Fulfillment, Product, and Program Managers.

The team culture emphasizes quality, knowledge sharing, and open communication. Daily activities include coding, system design, debugging, and participating in design reviews. Team members are encouraged to share opinions and contribute to a collaborative environment that values both professional growth and personal connections.

This role offers the opportunity to work on complex problems at scale, directly impacting Amazon's delivery capabilities. You'll be part of a high-energy team committed to quality and continuous improvement, with regular opportunities for knowledge sharing through demos and presentations. The position combines technical challenges with business impact, making it ideal for engineers who want to grow their skills while contributing to a major logistics operation.

Last updated 3 months ago

Responsibilities For Software Development Engineer II, Amazon Flex, Capacity Planning

Collaborate with cross-disciplinary teams to design and bring innovative products to market
Design and build technologies in a large distributed computing environment
Code solutions for broadly defined problems in an agile environment
Maintain system health and improve operational excellence
Participate in code reviews and design reviews
Work with services including SNS/SQS/Lambda/DynamoDB/S3/AppConfig/Sagemaker/StepFunctions

Requirements For Software Development Engineer II, Amazon Flex, Capacity Planning

Java

MongoDB

3+ years of non-internship professional software development experience
2+ years of design or architecture experience
Experience programming with at least one software programming language
Experience with design patterns, reliability and scaling of systems

Benefits For Software Development Engineer II, Amazon Flex, Capacity Planning

Medical Insurance

Dental Insurance

Vision Insurance

401k

Comprehensive health benefits package
Equal opportunity employer
Inclusive work culture
Professional development opportunities

Amazon

Global technology company focused on e-commerce, cloud computing, digital streaming, and artificial intelligence.

Toronto, ON, Canada

Backend

Mid-Level Software Engineer

In-Person

5,000+ Employees

3+ years of experience

Logistics

Amazon

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Data Structures & AlgorithmsMedium

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Amazon

Design a turnstile with locked and unlocked states, and implement insert_token() and push() methods.

System DesignHard

Let's design a turnstile. A turnstile is a type of gate which allows one person to pass at a time. Consider a turnstile at a subway station. There are two panels that rotate to allow a single person passage. The turnstile has two states, Locked and Unlocked, and the customer can either Push the turnstile or Insert a token/card. Here is the state transition table: | Event | Current State | Action | Next State | | :----- | :------------ | :------------- | :--------- | | Push | Locked | | Locked | | Token | Locked | Unlock | Unlocked | | Push | Unlocked | Pass through | Locked | | Token | Unlocked | (discarded) | Unlocked | Requirements: Model the state and behavior of a simple turnstile. Implement two methods: insert_token() push() Consider edge cases and error handling. What happens if someone tries to push without inserting a token? What happens if the system malfunctions? Example: turnstile = Turnstile() print(turnstile.state) # Output: Locked turnstile.push() print(turnstile.state) # Output: Locked turnstile.insert_token() print(turnstile.state) # Output: Unlocked turnstile.push() print(turnstile.state) # Output: Locked How would you approach this design and implementation, keeping in mind scalability, maintainability, and potential future extensions such as different types of tokens or remote unlocking?

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Amazon

Tell me about yourself

Behavioral

Tell me about yourself. To give you some guidance, please share information beyond just your resume. For example, what are you passionate about, what motivates you, and what are some of your long-term career goals? Think about some significant accomplishments you are proud of and how those experiences have shaped you. What makes you a unique candidate and a good fit for our company, beyond your technical skills? I'm looking for a comprehensive overview of who you are, both professionally and personally.

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