Available for remote opportunities

SENIOR FULL STACK & AI ENGINEER

I build scalable products that turn complex ideas into reliable software.

10+ years of experience building production-grade SaaS, APIs, automation and AI-powered applications with Ruby on Rails, React, Next.js, PostgreSQL and AWS.

Kapil Goyal
Kapil GoyalSenior Full Stack & AI EngineerRuby on Rails · React · Next.js · AI

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01 — ABOUT

Engineering with product thinking.

I enjoy taking ownership from architecture and implementation through deployment and production support.

I'm a senior full-stack engineer specializing in Ruby on Rails, React/Next.js, PostgreSQL and cloud infrastructure. Over the years, I've worked across SaaS, property management, payments, e-commerce, recruitment, mobile and AI-powered products.

My approach is pragmatic: ship a solid first version, measure real usage, remove bottlenecks and evolve the architecture as the product grows. I care about maintainable code, reliable APIs and a polished user experience.

10+Years Engineering
8+Years Mobile
10+Years AWS / Cloud
20+Technologies
02 — TOOLKIT

Technologies I work with.

Ruby on Rails
React / Next.js
TypeScript / JavaScript
PostgreSQL / Redis
AWS / Azure
AI / LLM Integration
REST APIs & Integrations
Android / iOS
03 — SELECTED WORK

Products I've helped build.

A selection of platforms and engineering work spanning SaaS, mobile, automation and AI.

04 — EXPERIENCE

A decade of building software.

AI-Powered Web & Mobile Solutions Architect

Bittern Technologies

May 2025 — Present

Building AI-enabled web and mobile products, SaaS platforms, APIs and automation workflows using modern full-stack technologies.

Freelance Ruby on Rails Backend Engineer

Builder.ai

May 2021 — Jan 2024

Developed production Ruby on Rails backend applications, REST APIs, database workflows, integrations, background jobs and performance improvements.

Full Stack Engineer

Full Stack Engineering

Jan 2016 — Present

10+ years building SaaS products, APIs, payment workflows, integrations and scalable applications across backend and frontend stacks.

Team Lead — Ruby on Rails

Flexsin

Jan 2014 — Jan 2016

Led Ruby on Rails development, architecture, code reviews and delivery while working closely with product and engineering teams.

05 — AI ENGINEERING

Building with AI, not just talking about it.

I integrate LLMs into real products and engineering workflows, focusing on useful automation, structured outputs, prompt refinement, verification and reliable production behavior.

OpenAI & Anthropic API integrations
LLM-powered product features
Prompt engineering & structured JSON outputs
AI-assisted software development
Automation & agentic workflows
Human-in-the-loop verification
06 — CONTACT

Have a product to build?

I'm open to remote full-stack, backend, AI engineering and product engineering opportunities.