Amazon

Software Development Engineer II

Working on enabling billions of customers enjoy their shopping journey on Amazon, directly from Search

Software Development Engineer I

- Delivered an automated filtering and auditing system for Amazon's wearable products, entirely managed with a single infrastructure based on AWS CDK (Lambda, Cloudwatch, S3) with Typescript, as well as internal processing platforms.
- Created ETL jobs based on Spark, with queries being exclusively managed in code with Java and Scala, allowing to have unit and integration tests in an full CI/CD fashion.
- Finished with 1st place in GraphML mutagenic classification task, top 0.3% in product matching task with multimodal tabular data, top 2% in NLP product safety identification task, all of which were internal machine learning competitions across Amazon, worldwide.

Software Development Engineer Intern

- Developed a large-scale image processing data pipeline for fashion-related items by creating and managing AWS resources such as EC2, Lambda, SQS, CloudWatch, DynamoDB and S3 with the AWS CDK and TypeScript.
- Reduced by x60 the processing time of images by parallelizing the execution of Python jobs and taking advantage of AWS Step Functions and AWS Batch processing.
- Delivered an automated and asynchronous pipeline workflow by adding CI/CD as well as unit and integration tests.

Air Liquide

- Contributed to the retro-engineering of an internal reporting solution by identifying key business partners and analyzing 193 reports through Google Apps scripts and Excel processing. 
- Improved customer experience by producing fully operational documentation for a principal client software and by interpreting end-user’s needs with Google Forms and Google Slides. 
- Increased back-end performance by inspecting the frequency and time of execution of SQL reports.

Solution & Data Intern

Envato

I have done freelancing on the Envato platform which consisted in Photoshop actions and Designs.

Freelance

SDE & AI @Amazon | Simplifying software engineering, system design, and generative AI | Building Hungry Minds: the newsletter to stay ahead in software 👇

Tell me about the last time you felt growing as a software engineer. Really.

𝙽𝚞𝚕𝚕𝙿𝚘𝚒𝚗𝚝𝚎𝚛𝙴𝚡𝚌𝚎𝚙𝚝𝚒𝚘𝚗? Here's why:

We all face information overload as software engineers. 
There's too much content and too little time.
You have to stay relevant, but it's hard.

Right now, you're either working or taking a break.

You are hoping to get a dopamine shot from scrolling your feed.

You can find:

💡 A practical tip to implement
📚 An inspirational quote
😆 Something funny

And then what?

→ Scroll past it? 
→ Forward it blindly to a friend?
→ Forget about it in the bookmarks?

The harsh truth: nothing.

What you consume passively doesn't make you learn.

How do I know?
It was the same for me for years.

How do you stay updated with AI, stay relevant in the job market, and continuously grow?

That's the problem I set out to solve with Hungry Minds - a free weekly newsletter to help software engineers learn and stay updated, without the noise.

I'm doing that by:

1. Writing to you daily on LinkedIn to 40K+ followers and over 5M impressions last year
2. Compressing 1 week of software deep dives and trends in 1 free newsletter issue
3. Sharing my thoughts and learnings being promoted to SDE II in 1.5y at Amazon

If that sounds interesting, check out Hungry Minds or DM me! I'm always down for a chat.

Save 50+ hours of your week here: 𝗵𝘁𝘁𝗽𝘀://𝗵𝘂𝗻𝗴𝗿𝘆𝗺𝗶𝗻𝗱𝘀.𝗱𝗲𝘃 (6K+ engineers from startups to big tech are reading already)

DISCLAIMER: Opinions expressed are solely my own and do not express the views or opinions of my employer.

My career background:

I'm currently an L5 software engineer at Amazon in Madrid, working on core Search CX and Personalization. 
In 2022/2023, I delivered 2 successful billion-scale projects with multiple teams across different time zones.

I have worked with multiple code languages (although this doesn't make a difference), and with tech stack in the lines of AWS CDK, React applications, scheduling systems, backends with GraphQL, and simple AI applications.

My education background:

- I finished a Master's in Machine Learning and AI with l'Ecole Polytechnique and IPP
- I completed a Master's in Computer Science and Data Science with ESILV Paris
- I got a Master's in business development and marketing with EMLV Paris

Alexandre Zajac

You can’t catch fish with a broken net.

And you can’t ship a product with a broken pipeline...


When tickets dry up or the market slows down,
most engineers take a nap.

But the senior engineer?
They see an opportunity.

They use that time to build velocity for later.

While others wait, they:

↳ Refactor that legacy module.
↳ Finally fix the recurring tickets.
↳ Fix the flaky tests slowing down CI.
↳ Automate the manual deployment steps.
↳ Update the documentation no one reads.

Don't wait for the "perfect time".
It never comes.

The storm IS the perfect time.

Build the net now. Catch the fish later.


What do you think?


~~~

👉🏻 Join 50,001+ software engineers getting curated system design deep dives, trends, and tools (it's free):
➔ https://lnkd.in/dkJiiBnf

~~~

If you found this valuable:

👨🏼‍💻 Follow Alexandre Zajac
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♻️ Repost to help someone in your network

SDE & AI @Amazon | Building Hungry Minds to 1M+ | Daily Posts on Software Engineering, System Design, and AI ⚡

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System Design One

Founder

Author of System Design Newsletter (37K+ Subscribers)

My mission is to help you become good at system design

My portfolio:
→ I'm writing a weekly newsletter on system design
→ I've 10+ years of software engineering experience
→ I've worked at startups and big companies
→ I've mentored many engineers

My results:
→ 100,000+ software engineers learning system design through my newsletter

My newsletter:
→ newsletter.systemdesign.one

Neo K.

If you want to become good at system design
(in 3 weeks), learn these 15 case studies:


1. How Stock Exchange Works:
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7. How Kafka Works:
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8. How Slack Works:
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9. How Does Google Docs Work:
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10. How YouTube Was Able to Support 2.49 Billion Users With MySQL:
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11. How Reddit Works:
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12. How Spotify Works:
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13. How URL Shortener Works:
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14. Redis Use Cases:
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15. How Meta Handles 11.5M Serverless Function Calls per Second:
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What else should make this list?

——

👋 PS - Want my System Design Playbook for free?

Join my newsletter with 190K+ software engineers:
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———

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Neo Kim

I Teach You System Design • 0.5M+ Audience

15 System Design Case Studies for Software Engineers

I built a GitHub repo to help you learn system design:
It gives you...

• System design fundamentals
• System design interview questions
• Deep dives into real-world architecture
• Simplified engineering case studies with visuals

——

👋 PS - STAR this repository right now if you find it valuable:
→ https://lnkd.in/eKATU6QV

———

💾 Save this, and repost to help others learn system design.
👤 Follow Neo Kim + turn on notifications.

If you want to become good at API design,
learn these 20 concepts:


An API is a set of rules that allows different services to talk with each other.

(What else would you add?)

——

👋 PS - Want my System Design Playbook for free?

Join my newsletter with 190K+ software engineers:
→ https://lnkd.in/ersEywFE

———

💾 Save this for later, and repost to help others learn API design.
👤 Follow Neo Kim + turn on notifications.

If you want to start with system design this year,
learn these 12 concepts:


1 How JWT Works:
↳ https://lnkd.in/ek9_BTUc

2 How Idempotent API Works:
↳ https://lnkd.in/erMkqwq4

3 How RPC Works:
↳ https://lnkd.in/eScZS9F5

4 LLM Must-Know Concepts:
↳ https://lnkd.in/eSd6fS7n

5 Frontend System Design Concepts:
↳ https://lnkd.in/ehHuXpjx

6 API Versioning - A Deep Dive:
↳ https://lnkd.in/eg_fmBhu

7 API Design Best Practices:
↳ https://lnkd.in/eUEFzEC8

8 How Consistent Hashing Works:
↳ https://lnkd.in/eUP9DbCg

9 How Service Discovery Works:
↳ https://lnkd.in/eCYYwQfU

10 Concurrency Is Not Parallelism:
↳ https://lnkd.in/e9PHuw2e

11 Must-Know System Design Concepts Explained:
↳ https://lnkd.in/eijR9-aG

12 How Saga Design Pattern Works:
↳ https://lnkd.in/eFXC4-aJ

(What else should make this list?)

——

👋 PS - Want my System Design Playbook for free?

Join my newsletter with 190K+ software engineers:
→ https://lnkd.in/ersEywFE

———

💾 Save this, and repost to help others learn system design.
👤 Follow Neo Kim + turn on notifications.

12 System Design Concepts for Software Engineers

If you want to become a world-class software engineer
(in 2026), read these 12 books...


What else should make this list?

——

👋 PS - Want my System Design Playbook for free?

Join my newsletter with 190K+ software engineers:
→ https://lnkd.in/ersEywFE

———

💾 Save this for later and repost to help others become good engineers.
👤 Follow Neo Kim + turn on notifications.

12 Books to become a world class software engineer:

API Versioning
(explained in 2 mins or less):


API versioning is a way to update an API without breaking existing clients that depend on it.

It ensures backward compatibility and avoids interruption.

(What else would you add?)

——

👋 PS - Want my System Design Playbook for free?

Join my newsletter with 190K+ software engineers:
→ https://lnkd.in/ersEywFE

———

💾 Save this for later, and repost to help others learn API versioning.
👤 Follow Neo Kim + turn on notifications.

12 best GitHub repos to boost your software engineering career
(star + bookmark them):


1 Vision Agent
↳ https://lnkd.in/e-ZHJTqc

2 System design
↳ https://lnkd.in/e7SUQ3ei

3 Public APIs
↳ https://lnkd.in/epWSyzqs

4 Tech interview handbook
↳ https://lnkd.in/e7EjsJNF

5 Coding interview university
↳ https://lnkd.in/evJSNCPE

6 Engineering leadership
↳ https://lnkd.in/ePCzV3zF

7 Freecodecamp
↳ https://lnkd.in/e_4pA8xV

8 Developer roadmaps
↳ https://lnkd.in/e9MuB_Yg

9 Path to senior engineer handbook
↳ https://lnkd.in/exkJCxVi

10 Free programming books
↳ https://lnkd.in/eXAzAJ3M

11 Build your own x
↳ https://lnkd.in/ekZQbTPz

12 Awesome lists
↳ https://lnkd.in/eczWuVG2

(Star + bookmark them RIGHT NOW.)

What else would you add?

——

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👤 Follow Neo Kim + turn on notifications.

If I had to scale a system,
here are 40 techniques I'd consider:


There are different ways to scale.
The best solution + numbers depend on your needs.
Remember, everything is a tradeoff.

What else should make this list?

——

👋 PS - Want my System Design Playbook for FREE?

Join my newsletter with 200K+ software engineers:
→ ​​https://lnkd.in/ehTrcyak

———

💾 Save this for later and repost to help others learn system design.
👤 Follow Neo Kim + turn on notifications.

System Design Scalability for Software Engineers

A gentle reminder for software engineers
(you'll thank me later)...

taplio

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taplio

The Battle

Alexandre Zajac

Neo K.

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Performance Score.css-goub6s{font-size:var(--chakra-fontSizes-md);font-weight:500;color:var(--chakra-colors-gray-600);display:block;margin-top:var(--chakra-space-1);}Alexandre Zajac's LinkedIn Performance

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