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SajjanKarn/README.md

Sajjan Karna

Software Engineer · 5+ Years Building Systems That Scale

Website · LinkedIn · Instagram · YouTube · Email


I make computers do things they probably shouldn't.

👋 About

For 5+ years, I've architected and built production systems that handle real scale: multi-tenant SaaS platforms, microservices infrastructure, and products shipping to thousands of users. Along the way I've led engineering teams, broken things, fixed them, and occasionally pretended the original design was intentional.

My core strength is backend systems design: scalable APIs, database architecture, and reliable infrastructure. I also build frontend and mobile when needed, but my deepest expertise is in the systems that make products actually work at scale.

I like understanding how things work, making complicated things boring, and leaving codebases slightly less cursed than I found them.

💼 Experience

Period Role Highlights
Apr 2025 – Present Sr. Software Engineer
Technimus LLC · Delaware, US
Led development of 3D canvas printing editor (Three.js, print-ready exports). Worked on OSOM, a multi-tenant platform for international student consultancies, covering database design, real-time chat, and AI-driven insights. Integrated WhatsApp Cloud, Bulk SMS, and Meta Marketing APIs. Helped shape Quest and migrated 85K+ legacy records.
May 2025 – Present Founding Engineer / Product Architect
LekhaPatra · Lalitpur, Nepal
Architected a mobile-first restaurant SaaS (POS, billing, inventory, purchasing) serving 20+ stores. React Native apps for Android and iOS, with APIs handling 100K+ requests/day flawlessly with 99.99% uptime.
Nov 2024 – Apr 2025 Frontend Engineer
Perceive Now · San Francisco, US
Built real-time chat systems and worked with the AI team to improve report generation efficiency by 20%. Cut load times by 35% and met WCAG 2.1 accessibility standards.
Aug 2024 – May 2025 Full Stack Engineer
Scalebit
Shipped production systems for trekking, education, and events. Backend APIs at 50K+ requests/day. Cross-platform mobile apps used by 5,000+ active users.
Oct 2023 – Feb 2024 Full Stack Engineer
SphereFive Services · Doha, Qatar
Built web and mobile platforms that increased customer inquiries by 35% and cut bounce rate by 28%.
Apr 2022 – Sep 2023 Founding Engineer
Rentide
Built a rental marketplace from 0 → 1 with a real-time booking system, payments, and a mobile app. 500+ users. Top 50 at Nepal KMII, 2nd place at the SET exhibition (113 projects).
2019 – 2024 Consulting & Contract Work
Various
Full-stack site for Kathmandu University's CS department (300+ users), CMS and backend work for Himalayan Adventure, Docker infrastructure for Outsmash, and a Next.js e-commerce build that lifted revenue 20% for Rubina Khadya Udhyog.

🌿 Outside the Machine

I like music, riding my bike, taking unnecessarily long routes, and getting lost on purpose.

I spend enough time around artificial things, so I like disappearing into places that weren't designed by humans. Most days end with a good song, an empty road, or a sunset.

Mostly Human. Sometimes Programmer.

More about me →

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  1. Jamify Jamify Public

    REA Youtify + Spotify UI Purely Vibe Coded.

    TypeScript