Rishi Diwan, Developer in Pune, Maharashtra, India
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Rishi Diwan

Verified Expert  in Engineering

Software Developer

Location
Pune, Maharashtra, India
Toptal Member Since
December 23, 2020

Rishi is a passionate coder and solutions architect. He has expertise across the entire spectrum of software design, implementation, and innovation. Rishi built a secure internet scale digital document locker, certified by Microsoft to scale to one billion users. He has worked with enterprise software, helped start-ups grow from the ideation stage, and expanded several companies into their first million in revenue. He enjoys solving engineering problems and utilizing the FOSS ecosystem.

Portfolio

Lyrasis, Inc.
Python, Flask, Docker, AWS Fargate, Amazon Web Services (AWS), Pytest, Tox...
Ignite Solutions
Azure Table Storage, Solution Architecture, Web Architecture, Code Architecture...
Ignite Solutions
Python, AngularJS, Architecture, jQuery, JavaScript, Node.js, ZeroMQ, APIs...

Experience

Availability

Part-time

Preferred Environment

Amazon Web Services (AWS), Ubuntu, MySQL, MongoDB, Flask, Python, Cron, Amazon EC2, API Integration, Django, Django REST Framework, Django ORM, REST, Cloud Infrastructure, Full-stack, PostgreSQL, CSS, Git, Back-end

The most amazing...

...project I've built is a highly secure internet scale digital document locker, certified by Microsoft in being able to scale to one billion users.

Work Experience

Senior Python Developer

2022 - 2023
Lyrasis, Inc.
  • Optimized the back-end async jobs so as not to slow down the database engine. This was accomplished primarily by optimizing SQL queries and changing certain aspects of how the jobs ran.
  • Architected and implemented the changeover of how their Docker containers ran in EC2 machines to running in AWS Fargate. Terraform was already in use in the project and was leveraged to manage the Fargate infrastructure.
  • Reimplemented the data feed generation mechanism integral to a library ecosystem where catalogs of books are exchanged on a daily basis between different libraries. The outdated and newer protocols could be used interchangeably thereafter.
  • Updated and managed their in-house library card authentication system with new features and ensured it remained up to date with Python frameworks, including adding unit tests to the repository.
Technologies: Python, Flask, Docker, AWS Fargate, Amazon Web Services (AWS), Pytest, Tox, Unit Testing, Amazon Elastic Container Registry (ECR), Cron, Amazon EC2, API Integration, Django, Django REST Framework, Django ORM, REST, React, Cloud Infrastructure, Full-stack, PostgreSQL, TypeScript, CSS, Git, Back-end

Technical Lead

2015 - 2021
Ignite Solutions
  • Served as a technical lead and was responsible for all technical decisions made in a technology consulting company. I had a large hand in developing scalable processes for managing the technology across multiple clients and projects.
  • Researched and implemented a homegrown image recognition software using OpenCV in a cross-platform manner. The software could be used on mobile devices, and it was mainly used for recognizing images in books.
  • Devised economical and efficient ways for clients to achieve their initial MVP status while growing and changing rapidly as a startup specialty consulting company.
  • Managed team estimations for entire projects, keeping tasks on time and ensuring slippages or inaccurate estimates were known well beforehand. Also managed the teams and end-to-end delivery of projects.
  • Architected dozens of unique projects from the ground up based on the unique needs of each client.
  • Architected a web-scale (800 million) infrastructure for DigiLocker. This included secure and redundant storage of files, PII for all users, and a scalable arch for managing live sessions for viewing and annotating documents.
  • Architected and implemented a website scan engine that scaled out to scan 100 million websites, filtered them down to scan three million every half hour, and stored the results for every scan as history.
  • Engineered the complete migration of a running business from an unscalable low-code solution to a fully scalable custom code deployment with almost no service disruption. This included two apps, a website, an administration panel, a back end, and a database.
  • Completed R&D on NLP-based chatbots. Implemented an end-to-end workflow to create chatbots as shopping assistants. This was accomplished using Spacy.
  • Architected a complete migration of a very complex enterprise dashboard to an Angular stack as a complete rewrite.
Technologies: Azure Table Storage, Solution Architecture, Web Architecture, Code Architecture, Team Leadership, Docker, AWS Fargate, Amazon DynamoDB, RabbitMQ, Elasticsearch, Google Cloud, Azure, Amazon Web Services (AWS), MongoDB, MySQL, Redis, jQuery, JavaScript, Python, APIs, Amazon Elastic Container Registry (ECR), AWS Lambda, Cron, Amazon EC2, API Integration, Django, Django REST Framework, Django ORM, REST, Full-stack Development, React, Cloud Infrastructure, Full-stack, PostgreSQL, TypeScript, Chrome Extensions, CSS, Git, Back-end

Full-stack Developer

2011 - 2015
Ignite Solutions
  • Developed a scalable messaging system using WebSockets for the server to pass events to the clients in real-time. I wrote code in Node.js. These events would begin as database entries and be propagated through the back end via ZeroMQ.
  • Created a companion screen app using jQuery and Dojo that was capable of launching apps within itself and manage lifecycles as a marketplace.
  • Took over a legacy codebase in PHP and cleaned up thousands of redundant code lines under the hood while implementing new features on the same codebase. This codebase is now robust and still runs the business.
  • Delivered an Instagram clone in the early days of iOS which was built to store and upload very high quality pictures without having memory issues.
Technologies: Python, AngularJS, Architecture, jQuery, JavaScript, Node.js, ZeroMQ, APIs, AWS Lambda, Cron, Amazon EC2, API Integration, Django, Django REST Framework, Django ORM, REST, Full-stack Development, Cloud Infrastructure, Full-stack, CSS, Git, Back-end

Research Assistant

2010 - 2010
La Trobe University
  • Wrote the embedded code for a smart switch which was to meter and transmit the usage of the appliance attached to the switch.
  • Completed a POC for the Zero Emissions House project for the Australian Government at La Trobe University.
  • Drafted, collaboratively, the protocol that would be used for the smart switches to transmit information and even be controlled remotely.
Technologies: C, Microsoft Visual C++, Embedded C

Junior Software Developer

2007 - 2008
Max Secure Software
  • Researched singlehandedly the new anti-virus division based on which the product was later developed.
  • Converted the research POC into a marketable anti-virus product with the team.
  • Improved the quality of the anti-virus product to make it the flagship product of an established company.
Technologies: Microsoft Visual C++, Assembly, Cybersecurity

Enfold Digital Locker

An internet scale digital locker service. Originally built to be the preferred digital document locker for the Indian subcontinents' denizens through a government initiative. The goal was to be able to scale for a billion people and terabytes of data.

A microservices architecture in Python built atop Microsoft Azure's cloud allowed for this to be certified as scalable to the aforementioned level by Microsoft itself.

As the architect of the system I had a large hand in the infrastructure and code design philosophies, specifically targeted at scale and security, and as a developer I assisted in implementing the design.

Web Uptime Tracking

A website uptime tracking service built to look through large sections of the internet and continuously track the uptime of websites.

Initially, this began with 80 million websites, which was reduced to a modest 3.6 million "valid" websites. Each of which was monitored every half hour for their uptime statistics and stored for later processing and statistical analysis.

I architected, implemented, and operated the entirety of the web scan engine.

Crowdsourced Animal Fund Raiser

This company already had an established codebase with a small business running on it. With minimal funding, they were ready to invest their capital in a system re-write as the current code base was badly written and had a host of issues plaguing them.

I was the technical lead on the project. As a team, we decided the investment capital was better spent on growing their customer base than re-writing the system. We fixed every bug we could find and completed "under the hood" refactors of the codebase to ensure the best standards were followed throughout their business layer.

We also introduced a rule-based throttling system to their email campaign engine to allow their marketing campaigns to remain in the "non-spam" category.

Following this, an entire line of business was introduced, around eCommerce, within the short span of four weeks. This allowed for a lean method of testing the given business and iterating without breaking the bank.

This was a crucial decision that helped them spend on their customer acquisition and retention, pushing them towards their first million in revenue. This was a pivotal point as now they are growing over 300% YoY. Their first million is but a blip in the past.

Library Circulation

https://thepalaceproject.org/
Multiple repositories were part of this project, mostly in Python. There was a front end with React as well. I fixed multiple scaling issues with the codebase, including unscalable SQL queries, job scheduling, and business logic optimizations.

The project included updating a legacy open-source codebase from Python 3.5 to Python 3.11, adhering to strict typing with Mypy. I worked with a team of five, fixing bugs, building features, architecting solutions, and delivering milestones.

Languages

Python, JavaScript, CSS, TypeScript, C, Embedded C, Assembly

Frameworks

Flask, Django, Django REST Framework, Angular, AngularJS, CakePHP

Libraries/APIs

Django ORM, Liquid, jQuery, Node.js, ZeroMQ, React

Tools

Git, Ansible, Cron, Amazon Elastic Container Registry (ECR), RabbitMQ, Amazon Elastic MapReduce (EMR), AWS Fargate, AWS CloudFormation, Microsoft Visual C++, Pytest

Paradigms

REST, Web Architecture, Microservices Architecture, Object-oriented Programming (OOP), Microservices, Test-driven Development (TDD), Unit Testing

Platforms

Amazon Web Services (AWS), Amazon EC2, Shopify, AWS Lambda, Azure, Docker, Ubuntu

Other

Code Architecture, Solution Architecture, Architecture, APIs, API Integration, Cloud Infrastructure, Back-end, Web Scraping, Full-stack Development, Full-stack, Chrome Extensions, Software Development Lifecycle (SDLC), Team Leadership, Business Information Systems, Neural Networks, Serverless, Tox

Storage

MongoDB, MySQL, PostgreSQL, Redis, Azure Table Storage, HBase, Google Cloud, Elasticsearch, Amazon DynamoDB

Industry Expertise

Project Management, Cybersecurity

2009 - 2011

Master's Degree in Computer Science

La Trobe University - Melbourne, Australia

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