Open to opportunities

Rahul Gupta

@rahulgupta18

Message

Senior Ruby on Rails engineer building observable, multi-tenant SaaS backend systems.

India

Message

What I'm looking for

I’m looking to build multi-tenant SaaS backends with strong API design, observability, and test-driven development. I want a team where I can own features end to end, mentor engineers, and translate complex requirements into intuitive user experiences.

I’m a Senior Ruby on Rails engineer specializing in multi-tenant SaaS architecture, GraphQL and REST API design, and high-scale backend systems. I focus on clean, maintainable code and test-driven development, and I enjoy owning features end to end—from technical decisions to delivery.

In my current role, I’ve led technical architecture for authentication, authorization, and billing in multi-tenant environments. I designed and shipped developer-facing APIs and integrations, built observability and monitoring with Datadog and Grafana, and established CI/CD and parallel-testing infrastructure to improve deployment reliability and developer productivity.

Previously, I built and optimized GraphQL APIs for a healthcare SaaS platform, resolving performance issues like N+1 queries and shipping version-safe schema changes. I’ve also integrated third-party services, implemented billing and subscription workflows, and added Sidekiq background jobs to reduce latency—while mentoring engineers on API design, testing strategy, and product thinking.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Raileurope

Aug 2022 - Present (4 years 2 months)

Own integrations with several European rail-carrier APIs covering search, booking,
cancellation and exchange: authentication and token refresh, retries and idempotency, async confirmation flows, and tracking partner API changes and deprecations before they break production.• APIs and documentation. Designed and shipped REST APIs and webhook delivery consumed by travel-agent
platforms and partners

Authentication Authorization Billing Developer APIs Observability Datadog Grafana CI CD Parallel Testing API Design Test Strategy Mentorship Rails API

Backend Developer

Deqode

Aug 2021 - Jul 2022 (11 months)

Built scalable Ruby on Rails backends supporting platforms handling over 1 million monthly requests. Integrated React.js and Angular front ends, delivered agile SDLC milestones, and delivered full-cycle development using PostgreSQL, Redis, Sidekiq, AWS, and Ansible.

Ruby on Rails Backend Development PostgreSQL Redis Sidekiq AWS Ansible React Angular Agile Development

Backend Developer

7Classes (InstaPrepsAI)

Aug 2020 - Jul 2021 (11 months)

Built a multi-tenant SaaS platform for online education and developed RESTful APIs for web and Android applications. Implemented real-time lecture features, teacher dashboards, and billing/subscription management across user tiers.

REST APIs Web API Development Billing Subscription Management

Associate Developer

Allerin Tech Pvt Ltd

Jun 2020 - Aug 2020 (2 months)

Built web applications using Ruby on Rails and designed internal and third-party API integrations. Worked across both Waterfall and Agile development lifecycles, with focus on database design, OOP, and software design patterns.

Ruby on Rails Web Application Development API Integration Waterfall Agile Database Design Software Design Patterns Object Oriented Programming