Arvind Kushwah

Senior Full Stack Software Engineer with 13+ years of experience building scalable SaaS platforms, enterprise applications, and cloud-native systems. Specialized in Ruby on Rails, Python, React, Next.js, React Native, PostgreSQL, AWS, and Docker, with hands-on expertise building Generative AI and Agentic AI features using OpenAI, LLM integration, and intelligent automation workflows. Experienced in leading complete software development lifecycles — from solution architecture and implementation to deployment, performance optimization, and long-term product evolution — for international clients.

Principal Software Engineer - Bittern Technologies

(2016-01)

• Led end-to-end design and development of SaaS, CRM, ERP, property management and AI-powered products.
• Designed and built Agentic AI workflows that autonomously handle multi-step tasks such as support triage, document processing, and workflow automation.
• Developed Generative AI features and integrated OpenAI APIs to build AI-powered assistants, including conversational interfaces and natural-language query tools.
• Designed scalable multi-tenant Ruby on Rails architectures and REST APIs.
• Built modern React and Next.js frontends with responsive UI/UX.
• Integrated OpenAI, Stripe, Plaid, Twilio, SendGrid, Google Maps and other third-party services.
• Managed AWS infrastructure, Docker deployments, CI/CD pipelines and production environments.
• Worked directly with international clients, translating business requirements into production-ready software.
• Mentored developers and drove code quality, testing and performance optimization.

Freelance / Contractor - Toadster Technologies Private Limited

(2024-01 - 2025-01)

• Delivered scalable full-stack web applications using Ruby on Rails, React, Next.js, PostgreSQL, AWS, Docker, CI/CD, and AI/GenAI integrations for business solutions.
• Collaborated with stakeholders and development teams, participating in architecture decisions, code reviews, debugging, deployment, and production support.
• Designed and developed scalable web applications and SaaS solutions, building backend APIs and responsive frontends.
• Integrated AI, GenAI, and Agentic AI capabilities into business applications, including LLM-powered workflows and intelligent automation.

Software Engineer - Builder.ai

(2020-10 - 2020-01)

• Designed and developed scalable RESTful APIs to support web and mobile applications and business workflows.
• Architected API endpoints, request/response structures, authentication, authorization, and data validation.
• Developed backend services using Ruby on Rails, following clean architecture and REST API best practices.
• Designed database models, relationships, and API data structures for scalable application development.
• Integrated third-party services and APIs to extend application functionality and automate business workflows.
• Collaborated with product managers, designers, and frontend developers to convert requirements and designs into production-ready features.
• Improved API performance through query optimization, caching, pagination, and efficient database operations.
• Followed Agile development practices and contributed to sprint planning, estimation, and delivery.

Senior Ruby on Rails Developer - Flexsin Technologies Pvt. Ltd. - Noida

(2015-03 - 2016-02)

• Designed and developed scalable Ruby on Rails applications.
• Optimized SQL queries and application performance.
• Collaborated with frontend teams and third-party integrations.

Ruby on Rails Developer - Yuvasoft Solutions Pvt. Ltd. - Indore

(2013-09 - 2015-02)

• Developed Ruby on Rails applications using MySQL and PostgreSQL.
• Integrated payment gateways (Stripe, PayPal) and external APIs.
• Worked in an Agile environment with RSpec testing.
• Deployed Ruby on Rails applications on Heroku and AWS EC2 instances.
• Debugged applications in production environments and resolved bugs.

Master of Computer Applications (MCA) - Computer Science - Rajiv Gandhi Prodyogiki Vishwavidyalaya (2010-01 - 2013-01)

Bachelor of Computer Applications (BCA) - Makhanlal Chaturvedi University (2007-01 - 2010-01)