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sunil kumar

@sunilkumar50

Senior Ruby on Rails Engineer who migrated HP's support portal applications from Rails 3/5 to Rails 7.

At Tundra Technical Pvt. Ltd., I worked on HP's Support Portal, designing and optimizing backend systems and migrating three legacy applications from Rails 3/5 to Rails 7.

I built internal DSLs for Sidekiq job orchestration and API integrations, and deployed services using Docker, AWS, and Kubernetes.

At Zymr Inc., I built backend modules for Pacer Pro, automating US federal court filing workflows. I also created web scrapers and document parsers with Nokogiri and Selenium.

Across my roles, I’ve worked on production Rails applications in telecom, publishing, wealth management, and SaaS. Most recently, as a Ruby on Rails Developer freelancer at Animax Technology, I developed and maintained web applications, integrated APIs, and handled production issues.

Experience

Work history, roles, and key accomplishments

Ruby on Rails Developer

Animax Technology

Dec 2025 - Sep 2026 (9 months)

Developed and maintained scalable web applications using Ruby on Rails 7, Ruby, and PostgreSQL/MySQL. Designed and integrated RESTful APIs, implemented business logic, and optimized database queries.

Ruby on Rails Ruby PostgreSQL MySQL JavaScript Angular React CSS Tailwind AWS Docker Sidekiq Redis Git GitHub CI CD

Senior Ruby on Rails Developer

Tundra Technical Pvt. Ltd.

Apr 2024 - Nov 2025 (1 year 7 months)

Designed and optimized backend systems for HP's global support portal using Ruby on Rails 6–7. Led migration of legacy applications, built internal DSLs, and implemented CI/CD pipelines.

Ruby Ruby on Rails MySQL PostgreSQL Docker AWS Redis Sidekiq React Amazon SQS CI CD Kubernetes

Ruby on Rails Developer

InterSoft Data Labs Pvt. Ltd.

Jul 2023 - Dec 2023 (5 months)

Resolved critical production issues in a live Rails application for book publishing and distribution workflows. Eliminated N+1 query problems and improved query performance.

Ruby on Rails PostgreSQL AWS Docker Kubernetes RabbitMQ New Relic

Backend Engineer

Zymr Inc.

Aug 2022 - Jul 2023 (11 months)

Built backend modules for real-time US federal court filing automation. Created web scrapers and document parsers using Nokogiri and Selenium.

Ruby Ruby on Rails PostgreSQL Nokogiri Selenium AWS Docker GraphQL Kubernetes Kafka

Ruby on Rails Developer

Optimal Virtual Employee

Feb 2020 - Aug 2022 (2 years 6 months)

Built scalable backend modules for a high-volume telecom retail system. Optimized RabbitMQ-based background processing workflows and developed AJAX-based UI features.

Ruby Ruby on Rails JavaScript MySQL Redis Sidekiq RabbitMQ REST React AWS Docker

Ruby on Rails Developer

Flexsin Technologies Pvt. Ltd.

May 2017 - Sep 2018 (1 year 4 months)

Delivered user management, dashboards, and reporting modules for wealth management and fitness SaaS platforms. Integrated payment gateways and built data visualization features.

Ruby Ruby on Rails Angular PostgreSQL