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Kamlesh Kumar

@kamleshkumar1

Senior Ruby on Rails full-stack developer delivering scalable, data-driven web applications and cloud deployments.

United States
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What I'm looking for

I seek challenging roles building scalable Rails applications, leading teams, and delivering cloud-native, data-driven solutions with strong engineering practices.

I am a Senior Ruby on Rails full-stack developer with 15+ years building large-scale, data-driven web applications that prioritize maintainability and performance. I specialize in object-oriented Ruby, Active Record data modeling, and optimizing PostgreSQL/MySQL databases for high-transaction workloads.

I have led projects modernizing legacy systems, migrating databases to PostgreSQL, and deploying Rails applications to AWS with CI/CD, Docker, and automated infrastructure as code. I design service objects, presenters, and modular front-end widgets using jQuery to create responsive, accessible UIs and real-time features via ActionCable.

I mentor engineers, apply SOLID principles and design patterns across monolithic and service-oriented Rails architectures, and deliver multi-tenant SaaS platforms, analytics dashboards, and secure authentication/authorization systems that scale in production.

Experience

Work history, roles, and key accomplishments

HS
Current

Lead Ruby on Rails Full Stack Developer

HD Supply

Jun 2022 - Present (3 years 5 months)

Led design and delivery of multi-tenant Rails SaaS platforms, implemented CI/CD and AWS infrastructure to enable zero-downtime deployments and improved scalability. Modernized legacy apps with service objects, Docker, ActionCable, and PostgreSQL optimizations to boost performance and maintainability.

FI

Lead Software Engineer - Ruby on Rails

Fidelity Investments

Oct 2019 - May 2022 (2 years 7 months)

Architected and delivered enterprise Rails dashboards and APIs, migrated databases to RDS and implemented background processing and secrets management to improve reliability and security. Mentored engineers and refactored monoliths into modular, object-oriented components.

BO

Senior Ruby on Rails Developer

Boeing

Oct 2017 - Sep 2019 (1 year 11 months)

Implemented scalable Rails services, background job processing, and versioned APIs while optimizing DB queries and caching to improve performance and developer productivity. Managed AWS accounts and reduced infrastructure costs via right-sizing and reserved capacity.

CH

JavaScript Developer

Cardinal Health

Mar 2016 - Oct 2017 (1 year 7 months)

Built analytics and interactive Rails front-ends using advanced SQL, jQuery visualizations, and background processing to support complex transactional workflows and multilingual user interfaces. Mentored junior developers on web and DB best practices.

SN

CSS Developer

State of NY

Jul 2011 - Aug 2014 (3 years 1 month)

Rewrote legacy front-end components for accessibility and modern JS compatibility, implemented multilingual Rails features, and optimized PostgreSQL queries and connection pooling for high-concurrency public applications.

AD

Software Developer

Ascensia Diabetes

Sep 2008 - Jul 2011 (2 years 10 months)

Developed full-stack Rails applications with responsive UIs, enforced Active Record data integrity, and refactored monolithic systems into modular, object-oriented architectures to improve maintainability and scalability.

Education

Degrees, certifications, and relevant coursework

Osmania University logoOU

Osmania University

Bachelor of Science, Science

Completed a Bachelor of Science at Osmania University with coursework supporting foundations in computing and related sciences.

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Kamlesh Kumar - Lead Ruby on Rails Full Stack Developer - HD Supply | Himalayas