Senior Product
Engineer &
Full-Stack Builder
7+ years architecting cloud-native systems, shipping 0→1 SaaS products, and leading engineering teams that scale.
7+
Years Experience
190M+
Transactions/Month
$150K
ARR Contributed
Availability
Open to new roles
Founding Eng · Senior SWE
Engineering Lead · Solution Architect
Core Stack
Education
B.Tech (Hons) CSE
Major in Machine Learning
LPU, Punjab, India
Open to Relocate or Remote
Who I am
About Me
Sajan Karamsingh Kashi
Senior Product Engineer
I'm a results-driven Senior Product Engineer with 7+ years of experience building full-stack products from zero to one. I thrive at the intersection of engineering excellence and product thinking — designing systems that are fast, resilient, and built for scale.
From architecting serverless backends handling 190M+ monthly transactions to shipping HIPAA-compliant healthcare platforms, I bring depth and breadth across the stack. I'm equally comfortable designing cloud infrastructure, writing production React code, or mentoring engineers.
Beyond shipping features, I care deeply about developer experience, system resilience, and building things that genuinely move business metrics.
Target Roles
What I work with
Skills & Technologies
Frontend
Backend
DevOps & Infra
Databases
Integrations
Leadership & AI
What I've built
Featured Projects
Serverless backend processing 190M+ monthly transactions with real-time dashboards, admin tooling, and multi-tier AWS architecture.
Full-stack healthcare platform with PHI de-identification, audit logging, encrypted access control, and modular React components.
Sales Engagement Platform
B2B outbound automation SaaS reaching $150K ARR, with real-time voice calling via Twilio, CRM integrations, and a LinkedIn Chrome extension.
3D Immersive Property Viewer
Interactive 3D real-estate visualization with Three.js — gyroscope support, object scaling, real-time chat, and area highlighting.
Micro-Frontend Learning Portal
Scalable micro-frontend platform for Wadhwani Foundation with a dynamic Google Forms-like form builder.
Blood Sample Tracking System
Clinical management system for tracking and managing blood samples across healthcare workflows.
Where I've worked
Work Experience
Real-time risk management & device intelligence platform for fintech.
- Collaborated with founders to define web app architecture and development strategy.
- Designed a serverless backend handling 190M+ monthly transactions using AWS Lambda, SQS, Step Functions, MongoDB, and DynamoDB.
- Built real-time insight dashboards to visualize platform usage, error trends, and business metrics.
- Developed an Admin Dashboard for client onboarding, access management, and system health monitoring.
Say Hello
Let's Build Something Great
I'm open to founding engineer roles, senior engineering positions, and engineering leadership. If you're building something ambitious — let's talk.