~/balajiContact
SDE 2 at Amazon, Chennai

Balaji Jayakumar

Software development engineer building customer-facing backend systems that stay fast and available under real traffic. I work across Java, Python, and TypeScript on AWS - from services running at 1500+ req/s to localization powering 100M+ Fire OS devices.

Get in touchSee experience
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req/s at peak
0M+
Fire OS devices reached
0%
latency reduction
0%
cloud cost cut
01 // experience

Where I've built

    • Developed and maintained three customer-facing backend systems, all hitting 1500+ req/s at peak across 3 regions.
    • Owned a client-side library powering localization across 100M+ Fire OS devices.
    • Designed and implemented a cloud-based localization solution for a custom Linux-based TV operating system for Fire TV.
    • Improved response times by removing redundant role instantiation, resulting in a 96% latency reduction.
    • Reduced cloud computing cost by 30% by switching instance configuration after analyzing system usage patterns.
    • Designed and implemented multiple AI solutions, including Gen AI / LLM initiatives for improving developer productivity.
    • Built the user interface for the Amazon Appstore's subscription management page on Amazon retail web.
    JavaSpring BootAWSAngularGen AI / LLM
    • Maintained the core user-facing micro-services, hitting 99% availability with 20 req/s at peak.
    • Enhanced backend response times by 40% by implementing a server-side cache using Redis for the micro-services.
    • Introduced project-level auditing that improved onboarding and customer-support productivity by 20%.
    • Implemented Shared QR, letting multiple merchants share a single QR code for purchases.
    • Extended support to 7 new regions for high-profile retail merchants serving 50,000+ orders/year.
    • Ran core Agile ceremonies - sprint planning, review, retrospectives, and daily stand-ups - as Scrum Master.
    JavaSpring BootRedisMicro-servicesAgile
    • Developed a DIY portal letting business admins onboard merchants and content and curate the customer experience.
    • Contributed to a NestJS API Gateway coordinating micro-services and handling authentication and rate-limiting for 4 front-end clients.
    • Integrated AWS S3 for file uploads and cut image load times by 50% using the AWS CloudFront CDN.
    • Added i18n and l10n support plus a framework for regional expansion that streamlined new-region onboarding.
    • Streamlined payment-gateway drop-ins for the UI with a component resolver, making the interface secure and extensible.
    • Built for India and expanded to Indonesia, serving 4,000+ SMBs and influencers.
    Star Performer - Q4 2020Star Performer - Q2 2021
    NestJSAngularTypeScriptAWS S3CloudFront
02 // skills

Tools of the trade

Languages

  • Python
  • Java
  • JavaScript
  • TypeScript
  • C++

Tech stacks

  • Spring Boot
  • NestJS
  • Flask
  • Angular
  • Redis
  • AWS

Core competencies

  • Data Structures
  • Algorithms
  • Distributed Systems
  • System Design
  • Problem Solving
  • Code Review
03 // projects & extra

Beyond the day job

Crio.Do

Mar 2020 - Sep 2020
Student Developer

Worked through Crio's experiential developer program, building and shipping projects end to end.

Crio Launch portfolio

Codezoned

Aug 2018 - Feb 2020
Student Developer

Contributed to open-source repositories, including Pyfry - an OpenCV-based meme generator.

Codezoned on GitHub
04 // education

The foundation

SRMIST

2016 - 2020

Bachelor of Technology in Computer Science Engineering

Chennai, India

AlgorithmsOperating SystemsDatabasesNetworks
05 // contact

Let's build something

Hiring, collaborating, or want to compare notes on distributed systems? Reach out directly or drop a note below.