Kaustav Haldar

Principal engineer - Meta FinTech / Diem Core

Rust, Solidity, Hack, JS, Python, Internal tools

• Architected and wrote, audited, interoperable, Solidity smart contracts powering the launch ofInstagram NFTs on Polygon
• Principal engineer on decentralized storage manager service, wrote Rust implementation used to write NFT media data to Arweave
• Python, Hack/PHP work on internal tools and integrations
• Research engineering on internal frameworks for cross chain comparison for Diem, Move

Software Engineer II - Content Engineering

Scala, Ruby on Rails, Python, SQL, Databricks, Spark, DataDog, Sentry, Airflow, MLFlow

• Architected and implemented content understanding ML systems
• Incident response and ownership over our upload spam detection system
• Wrote tooling for and conducted largescale SQL backfills
• Wrote and migrated high throughput nightly jobs in Spark/Scala/Airflow
• External audit support on data and system functionality information
• Supported ML teams with full stack engineering including devops, versioning, frontend, security, monitoring etc

Software Engineer

JavaScript (ES6), HTML, SASS, React, JSX, Mobex, Travis, Python, Tensorflow, Docker

• Architected and delivered 3 multi team & codebase features; auto-grouping, copy-paste, data-binning
• Championed code-base modernization by using ES6, React
• Reduced CI failures by 90% by driving Travis integration
• Filed 2 patents related to web app architecture and hybrid blockchains with patent work leading into september
• Won an internal machine learning competition using Tensorflow
• Mentored interns and full-timers, ran workshops on blockchains, Travis, git
• Created devtools, improving developer productivity and halving new hire onboarding time
• Interviewed candidates and contributed to internal interview questions
• Fixed ~130 defects

Software Engineer Intern - Monitoring and metrics

Cloud hosting

Lua + Luvit, ELK, NodeJS, Python, Bash, Hadoop, Ruby, Go, Java, MongoDb, Sql, Kafka

• Worked extensively on improvements and bug fixes to aFOSS monitoring agent (Lua, Luvit) including writing ~40 new server monitoring endpoints and ~60 plugins from customers and other teams cleaned up, debugged and integrated.
• Wrote documentation for the Luvit framework
• Assisted in building a Kibana dashboard backed by Elasticsearch and a python ETL script for fleet monitoring using aforementioned data. This was used to find security holes (e.g. CVEs), tune developer efforts and generate insights.
• Data mining on archival data on Hadoop with Hive and reached out to customers
• Worked extensively on a large python project for automating support featuring service discovery, infrastructure monitoring and auto-repair, security autopatching (CVEs).
• Worked extensively on a large nodejs + java distributed monitoring system fixing bugs, docs, build processes & tools, development VMs; adding linting, tests, API endpoints, microservices, kafka integration. Achieved 10% improvement in some microservices and removed bottlenecks leading to a 10x speed and capacity improvement
• Onboarded developers and resolved technical disputes
• Worked with Chef for deploying and orchestrating infrastructure for the monitoring system. Patched & streamlined deployment mechanisms in Dreadnot an opensourced Rackspace devops framework
• Assisted in organizing an internal ~500 person, multi-day hackathon & conference in Texas, Rax.io 2016. Emailed colleagues to get volunteers and managed volunteers on the day of the event.
• Published an article about using and benchmarking kafka to the companys engineering blog which you can read here.
• Pushed accepted patches/features upstream to:
  • pypa/pip
  • facebook/hhvm
  • docker/machine
  • luvit/luvit
  • lmenezes/elasticsearch-kopf
  • racker/dreadnot
  • rackerlabs/mimic
  • rackerlabs/blueflood

Freelance full-stack developer

A marketplace for farmers and restaurants

Ruby on Rails, coffee-script

• Lead a distributed team of 4 developers to rapidly build a MVP for the startup and overhaul existing code and data
• Startup eventually failed to find product market fit

Freelance full-stack developer

A flight capable hardware platform for social media and event attendee engagement

JS, PHP & MySQL | CoffeeScript, Jade, Stylus, Bootstrap, video streaming libraries (ffmpeg)

• Built a mobile view and API for social media and viewing captured pictures, the main software offering of the startup
• Built a responsive cross platform event engagement display for screens ranging from projectors to smartphones
• Contributed to the TwitterFontana open-source project augmenting it for Brizi use

Co-founder, full-stack developer

An online marketplace for performers

MongoDB, ExpressJS, AngularJS

• Built core features of marketplace app as 1 of 3 founding developers including payments, profiles, invoices
• Conducted user interviews to define & prioritize new features
• Recruited buyers & sellers, grew to 500+ users & >$10k/yr revenue
• Featured on Globe & Mail, Techvibes, The Record, Betakit, Dragon's Den and raised ~$1m

Freelance web and mobile developer

A social entrepreneurship and project based education startup

JS, Cordova, SQLite, jQuery UI & mobile, SocketIO, Express, postgreSQL

• Design and implementation of Android application featuring barcode scanning, history, realtime and REST API integration for TV controls and a dashboard
• Remote collaboration with an overseas software development company for bugfixing, UI improvements and integration of client APIs with mobile application
• Wrote detailed application documentation which can be foundhere

Web developer

UW Co-op work term at a medium sized SaaS and advertisement company for SMBs

PHP, JS, HTML, MySQL, Bootstrap

• Fixed major platform bugs that could lead to serious data loss via SQL injection
• Restyled and created UI widgets for the corporate website leading to higher sales conversions and easier extensibility due to code cleanup
• Various small features and bugfixes on application front-end such as increased responsivity to screen sizes, wysiwyg editing and saving, guided walkthroughs

Volunteer web developer

UWAFT is an award winning student design team responsible for developing technologically advanced eco-friendly vehicles

• Bugfixes on wordpress site styling
• Collaborated on and implemented features and re-organization of content

Small business owner

• Assembled desktop computers
• Troubleshot hardware and driver issues
• Installed and configured OSs on client computers, handled partioning, drive re-formatting, virus & malware removal, software installations, data backup and recovery.
• Sold games, movies and software

Co-founder | Writer | Editor

Blog focused on nootropics and bio-enhancement

• Worked with a ~5 person founding team to launch a blog, which as of September 20th has 7k unique visitors, 500 recurring visitors, 2 sponsored ads and 1 affiliate partnership
• Wrote articles on psychology & pharmacology and some basicfundamentals of neuroscience

Logistics co-director

Canadas largest student organized hackathon. 1000 student hackers at the University of Waterloo. part of mlh.io

• Managed logistical issues related to food, internet, registration, event planning. Laid the groundwork for a successful hackathon which now happens every year
• Worked with a ~30 person team over the course of 8 months to pull off a successful major league hackathon

Kitchen Staff