Ujjaval Verma, Developer in Toronto, ON, Canada
Ujjaval is available for hire
Hire Ujjaval

Ujjaval Verma

Verified Expert  in Engineering

Software Engineer and Developer

Toronto, ON, Canada
Toptal Member Since
June 14, 2022

Ujjaval is a software engineer who has worked across various organizations, including early-stage startups and Fortune 100 companies. He helped launch products, deploy cost-saving optimizations, mentor other team members, and solve complex business problems in various industries, including fintech, healthcare, travel, and edtech. Ujjaval has a knack for highly scalable design paradigms and can help scale products with 10x growth in adoption and usage.


Go, Ruby on Rails (RoR), Microservices, Amazon Web Services (AWS), Stripe API...
Java, MySQL, Python, RabbitMQ, Apache Kafka, GitLab CI/CD, Elasticsearch, REST...
JavaScript, Ruby, Ruby on Rails (RoR), jQuery, Go, MySQL, Amazon EC2, Terraform...




Preferred Environment

IntelliJ IDEA, GitLab CI/CD

The most amazing...

...project I've done is an integration with a national billing system using a scalable microservice architecture that powers over two million daily transactions.

Work Experience

Senior Developer and Technical Lead

2021 - PRESENT
  • Served as a back-end developer and technical lead for the monetization team.
  • Led the integration effort with Stripe APIs to improve profitability, saving about $2.5 million in forex fees annually.
  • Optimized Radar's fraud API usage by creating a rules-engine-driven smart caching framework that helped reduce the number of external API calls by more than 85% and directly saved about $500,000 annually.
  • Designed and built an AWS-powered back end written in Go that empowers businesses to conduct remote inspections. The product supports various workflows, such as inventory audits and remote insurance claims.
Technologies: Go, Ruby on Rails (RoR), Microservices, Amazon Web Services (AWS), Stripe API, Apache Kafka, PostgreSQL, eCommerce APIs, Amazon API, Ruby, APIs, jQuery, Containerization, React, Stripe Connect, Stripe Connect API, Stripe, eCommerce, Payment APIs, Shift4Shop

Technical Staff Member

2020 - 2022
  • Spearheaded the engineering effort for the direct integration with NPCI's Bharat Bill Payment System (BBPS). This integration currently processes over two million transactions, amounting to over ₹1 billion daily.
  • Articulated with business, site reliability engineering, support, and operations roles and formally mentored other engineers on the team to help drive engineering and product efforts as a technical lead for the bill pay team.
  • Helped implement a multi-datacenter set up for the recharge and bill payment ecosystem in an active-active configuration. The set up supports disaster recovery in case of connectivity failure at one of the data centers.
  • Launched a new subscriptions category in the PhonePe app and automated the onboarding of new subscription billers, which do not require a development intervention. This category has grown to the highest market share of all its competitors.
  • Led the direct integration effort with Tata Sky DTH, the largest biller at PhonePe, improving business margins by 90 basis points per transaction and increasing the success rate from around 97% to more than 99%.
Technologies: Java, MySQL, Python, RabbitMQ, Apache Kafka, GitLab CI/CD, Elasticsearch, REST, REST APIs, CI/CD Pipelines, Agile Software Development, Docker, Team Mentoring, Microservices, RESTful Microservices, Software Architecture, API Integration, Back-end, SQL, Technical Leadership, APIs, Hibernate, Data Structures, Object-oriented Programming (OOP), Payment APIs, Software Design, Azure, RESTful Web Services, Databases, Spark, Distributed Systems, Jira, Git, Continuous Integration (CI), Python 3, Django, Containerization, Payment Gateways, eCommerce

Software Development Engineer II

2017 - 2020
  • Developed the Expert's exploration web app as a feature-rich enterprise platform with a UX powered by JavaScript, Backbone.js, and Go templates and a RESTful micro-service back end written in Go and Ruby on Rails.
  • Wrote an Azkaban batch workflow job to support a robust autocomplete feature, improving the page load time of the marketer platform's campaign app from around eight to under three seconds.
  • Developed and launched the product recommendations web app using the advocacy platform front-end framework, emphasizing modular Backbone views, reusable UX controls, and robust error handling for Ajax calls.
Technologies: JavaScript, Ruby, Ruby on Rails (RoR), jQuery, Go, MySQL, Amazon EC2, Terraform, Elasticsearch, Redis, REST, REST APIs, CI/CD Pipelines, Microservices, RESTful Microservices, Node.js, React, CSS, Software Architecture, Amazon Web Services (AWS), HTML5, Full-stack, Spring Boot, Back-end, SQL, Angular, GraphQL, Redux, Architecture, Technical Leadership, AWS Elastic Beanstalk, HTML, AWS Lambda, Web Development, Software Design, AngularJS, Kubernetes, RESTful Web Services, Amazon Aurora, Express.js, Databases, Serverless, CSS3, JavaScript 6, Amazon API Gateway, Distributed Systems, GitHub, Jira, Web Design, Redshift, Git, Object-oriented Programming (OOP), Continuous Integration (CI), Python 3, Django, eCommerce APIs, Containers, Linux, APIs, PHP, Responsive Web Design (RWD), eCommerce

Software Development Engineer II

2016 - 2017
Expedia Group
  • Wrote a RESTful Java web service for the Task Execution Framework (TEF) and set up service dashboards, monitoring, and alerts using Splunk telemetry data.
  • Set up integration tests for an asynchronous processing framework to test end-to-end calls across multiple microservices and a Jenkins build job to automate running these tests in the build pipeline.
  • Built the next generation of payment processing services powered by AWS that process 97% of Expedia's transactions, leading to a 25% reduction in annual hardware costs.
Technologies: REST, REST APIs, Java, Terraform, Amazon Simple Queue Service (SQS), Amazon DynamoDB, Amazon EC2, CI/CD Pipelines, Microservices, RESTful Microservices, Spring Boot, Amazon Web Services (AWS), Back-end, Architecture, PostgreSQL, AWS Elastic Beanstalk, Hibernate, Git, APIs, Linux, Payment APIs, Software Design, RESTful Web Services, Amazon Aurora, Databases, JavaScript 6, Distributed Systems, Jira, Object-oriented Programming (OOP), Continuous Integration (CI), Payment Gateways

Software Engineer

2012 - 2016
  • Wrote an OData-based RESTful WCF data service for the team's component testing framework. The service implemented create-read-update-delete (CRUD) operations for three graph-client-helper library requests and could support additional ones.
  • Optimized the end-to-end (E2E) tests' code flow for account provisioning flows, reducing their execution time from 60–80 to 40–45 minutes. Defined runner phases as part of quality improvements to help ascertain what code module caused a test failure.
  • Cooperated with other senior developers to decrease the system test failure rate by 90% while reducing the test execution time by 50%. It also helped save hardware costs by more than 10%.
Technologies: REST, REST APIs, Microservices, Azure, TypeScript, Back-end, SQL, APIs, Git, Data Structures, Object-oriented Programming (OOP), RESTful Web Services, Distributed Systems

Twilio-based WebRTC App

Designed and created a progressive web app that empowers businesses to conduct remote inspections. The product supports various workflows, such as inventory audits and remote insurance claims.

In addition to providing a robust WebRTC-based video conferencing experience that allows for self-recovery in bad network conditions, the app also allows capturing high-resolution pictures with geo-tagging.

The new web app was built from the ground up and achieved a success rate of >97% for remote inspections compared to just 85% for the previously used solution.

Live Video Lectures Platform

I designed and implemented a RESTful microservice that leveraged AWS Elemental MediaLive and MediaConvert pipelines to live streams and video-on-demand lectures and tutorials for users of the Pariksha Edutech mobile app (Pariksha.co).

The in-house implementation supported over 100 concurrent streams and achieved a low latency of fewer than 12 seconds compared to YouTube's 25-second and Vimeo's 30-second latency for live streams.

Health Monitor for NAO

Developed a GUI-based monitoring application in Python to monitor various hardware parameters of NAO humanoid robot used in robot soccer. It enabled remote monitoring via wifi connectivity. The project was presented in the Research and Development Showcase 2010.

Distributed Power Set Generation

Designed a distributed algorithm to represent the power set of a set in quadratic space and time complexity. Generated a power set of 30,000 elements in under two minutes and 10GB storage using a cluster of eight computing nodes.

Students Admission Portal

Developed a web-based portal to centralize the process of room allotment, mess registration, and payment receipts generation. The portal facilitated new admissions at IIIT, Hyderabad, for the academic session of 2010.

Virtual Labs Experiments

I developed Java applets that allowed for conducting civil engineering experiments on a computer virtually. These interactive simulations were deployed as part of the national Virtual Labs initiative of the Ministry of Human Resource Development, Government of India.

Crowdfunding Investment App with a Social Element

Built an MVP web app for Loupt LLC using React front end, Express.js back end, MongoDB data store, and Amazon S3 object-store. The web app leverages crowdfunding to allow non-accredited investors to invest in and own equity in early-stage startups.
2008 - 2012

Bachelor's Degree in Computer Science

International Institute of Information Technology, Hyderabad - Hyderabad, India


AWS Certified Solutions Architect

Amazon Web Services


Certified Angular Developer



C# ASP .NET Developer



REST APIs, Node.js, React, jQuery, Stripe API, Amazon API, Stripe Connect, Stripe Connect API, Stripe


Git, GitHub, Jira, Terraform, GitLab CI/CD, RabbitMQ, Amazon Simple Queue Service (SQS), Amazon CloudFront CDN


Ruby on Rails (RoR), Angular, AngularJS, Hibernate, Spring Boot, Express.js, Spark, Hadoop, Next.js, Django, Redux, Angular 7, Angular 4


Java, JavaScript, Go, TypeScript, CSS, Ruby, SQL, PHP, HTML5, HTML, Python 3, Python, CSS3, JavaScript 6, CoffeeScript, GraphQL


Agile Software Development, Microservices, REST, Object-oriented Programming (OOP), Continuous Integration (CI), Responsive Web Design (RWD)


Apache Kafka, Amazon EC2, Amazon Web Services (AWS), Docker, AWS Elastic Beanstalk, AWS Lambda, Kubernetes, Azure, Linux, Shift4Shop


MySQL, Databases, Elasticsearch, Redis, Amazon S3 (AWS S3), MongoDB, Amazon Aurora, Redshift, Amazon DynamoDB, PostgreSQL

Industry Expertise

Web Design


CI/CD Pipelines, RESTful Microservices, API Integration, Full-stack, Back-end, Architecture, Data Structures, Web Development, Payment APIs, Software Design, RESTful Web Services, Distributed Systems, Video Streaming, APIs, eCommerce, Team Mentoring, Technical Leadership, Software Architecture, Amazon API Gateway, Serverless, eCommerce APIs, Containers, Containerization, Payment Gateways, Extensions, Chatbots

Collaboration That Works

How to Work with Toptal

Toptal matches you directly with global industry experts from our network in hours—not weeks or months.


Share your needs

Discuss your requirements and refine your scope in a call with a Toptal domain expert.

Choose your talent

Get a short list of expertly matched talent within 24 hours to review, interview, and choose from.

Start your risk-free talent trial

Work with your chosen talent on a trial basis for up to two weeks. Pay only if you decide to hire them.

Top talent is in high demand.

Start hiring