SeniorSoftwareEngineer,SeunghwanLee_이승환 Class Description
Senior Software Engineer
Hello, I’m Seunghwan Lee.
I'm a Senior Software Engineer at LinkedIn,
a professional social media service acquired by
Microsoft in 2016 for a substantial amount of 30 trillion USD.
As it is famous for blitzscaling,
we were able to grow rapidly through
the New Product Development strategy that
rapidly changed and upgraded products
in a rapidly changing market.
"And behind this growth, functional programming,
which utilizes Java efficiently and flexibly, plays
a large role. Here, I would like to convey the
development methodologies using
Java Stream, which is used on LinkedIn,
to developers who want to develop
their products in an agile manner."
Since this lecture is not for beginners in Java,
I'll be showing how to use the essential
functions of user management,
and transaction management that
backend developers face in complex projects,
and code exercises using both Java Stream
and a functional programming approach.
I've included all my tips on the core technology
and methodology for scalability and reusability
to quickly evolve the software we develop and
change it into the form customers want.
I hope you will master it and increase
your future value as a developer.
Length: 56 videos
(Duration 7h 56m)
• Eclipse 4.6 or above
• Java 8 or above
PPT and Java programming files
From the Basics to Hands-on
You can learn about the basics and hands-on application of functional programming, which replaces loops with a single line of code.
From Basics of JAVA Stream
to Advanced Application
I will show you how I code so you can master the basics and applications of JAVA Stream through the given project exercises
Securing backend exercise
By practicing backend development exercises such as actual member management and transaction management, you can gain insights into streams used in the field.
25 Class Exercises
Create 9 backend
fundamentals with Stream.
- Filter order errors
- Extract email List
- Extract customer ID
- Extract emails from unverified members
- Extract customer ID with payment errors
- Extract orders with payment errors within the last 24 hours
- Sort members by name
- Sort orders by order date
12 advanced Stream exercises.
- Find the largest amount of order errors
- Check if all given members are verified
- Check order error
- Find the sum of the members’ number of friends
- Find the total order amount
- Create a member object app with a member ID
- Create an order status map with order ID
- Group orders by order status
- Group orders by status and obtain the sum of the amounts for each group
- Divide into groups of members with over and below 100 friends
- Send email alarms to unverified members
Practice with 4 design pattern
exercises using Functional Programming.
- Method to send email only to specific members at run time
- Verify members flexibly when creating members
Flexible payment workflow
With Functional JAVA and JAVA Stream as the upcoming trend!
Only the one who uses both JAVA Functional Programming
and JAVA Stream programs knows them the best.
Seunghwan Lee, Senior Software Engineer of LinkedIn headquarters
will provide real backend development exercises
to teach about JAVA Stream.
at LinkedIn (Sunnyvale, California)
Projects & Awards
Software Development Engineer
at Microsoft (Sunnyvale, California)
Software Engineer Intern
at Facebook (Menlo Park, California)
at Groupon Korea (Seoul)
Bachelor: Carnegie Mellon University BA / Computer Science and Mathematics (double degree)
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Senior Software Engineer
When I was an intern at Facebook, I’ve seen developers change the lives of people around me and even around the world.
I came to America to study after graduating from high school. I studied double majors in computer science and mathematics at Carnegie Menlo. I went to the army and interned for developers at Groupon Korea for three months, and I interned as a software engineer at Facebook headquarters before graduating from college. I think my experience on Facebook at the time built the stepping stones to work as a JAVA developer at LinkedIn in the future.
I've opened my eyes to code optimization while working at Microsoft.
I started my full-time career as a programmer at Microsoft. I started as a backend developer and developed an application. In Korea, it is said that developers change into managers when they get older, but I wanted to work as a developer for a long time, so I spent a lot of time absorbing numerous know-how related to the development and the experiences of superiors. What I realized this time was that we Koreans had very good development skills and that in order to be recognized for our skills, we had to constantly strive for optimization, not just hard work. Microsoft taught me a lot, but I moved to LinkedIn to grow into a backend developer.
7 years at LinkedIn. I am a backend developer specializing in member and order management.
I used to work in a commerce team at LinkedIn, but now I work as a B2B application backend developer. When I do backend programming, I often encounter situations where I have to process a large amount of data efficiently. JAVA Stream is an essential tool for this situation. In addition, various design patterns using functional programming are also frequently featured. All of LinkedIn's engineers use JAVA Stream as a meal every day. It's also an essential part. Just as we're moved by the beautiful text as we read, I and the developers around me show each other that we're moved by the beautifully written code. Most of these codes are optimized using Functional Programming and Stream. Even older developers have a shallow understanding of Functional Programming, so they use inefficient code, and I often point that out and fix it. I think that's one of the reasons why I can tell you about JAVA Stream.
I'll help you master both functional programming and JAVA Stream using actual exercises used in the industry.
What surprised me was that even though Korean developers are very good, they don't use much functional programming or Stream unexpectedly. In Silicon Valley, you can't even work as a JAVA developer without knowing these two. And the increasingly popular Functional Programming or Stream doesn't take long to learn. Many JAVA developers say that they don't come to Silicon Valley because they can't speak English, but in fact, developers don't have to speak English well. I hope you learn Functional Programming and JAVA Stream quickly in 5 hours, challenge yourselves to go to Silicon Valley and get paid in millions.
This course will use
• Eclipse 4.6 or above
• Java 8 or above
Please purchase and install these program(s) for an optimized lecture experience.
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This course will open on February 12, 2023 (PST)
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