hi, himansu here
building PayArk // backend & systems // kathmandu
work
- Founder & Lead Engineersince Feb 2026PayArk
Building the unified settlement layer for Nepal: eSewa, Khalti, and ConnectIPS behind one API. Sub-50ms transaction latency on Bun + Hono, and a 100% type-safe Effect TS SDK (@payark/sdk-effect) for merchant integration.
- Lead Systems Engineer (Contract)since 2025Freelance
Freelancing across client systems, backend tooling, automations, and operations workflows that make small teams move faster without adding process overhead.
- Backend Engineer2025Stealth Startup
Built a Redis context and token caching layer for LLM orchestration. Cut p99 inference latency 86% (1800ms → 240ms) and API spend 32% under 100+ concurrent sessions.
publications
- PayArk · Apr 2026
A three-layer interbank clearing protocol that compresses 1,000,000 citizen transactions into 19 RTGS settlement instructions (a 99.998% load reduction) at 7M packets/s on commodity hardware. Rust reference impl on io_uring, BLAKE3, and monoio, with LP-verified optimality.
projects
- Astral ↗
A blazingly fast VCS in Go: Blake3 hashing, a custom three-way merge, and content-addressable storage that handles object history more efficiently than traditional tools.
- Sahara ↗
Open-source crowdfunding platform focused on transparent fund distribution and a clean UX.
- Blank-is-Open ↗
Production-grade port scanner CLI built on Effect: type-safe resource management, retries, and zero unhandled exceptions.
- Blank-Physics & Blank-Piano ↗
A fluid physics simulator in Effect, and an artistic low-latency piano built on the Web Audio API.
- MeroPatro ↗
Ad-free, open-source Bikram Sambat (Nepali) calendar for the local Nepali dev community.
education
Self-directed study: concurrent algorithms, functional programming, compilers, distributed systems, OS fundamentals.
skills
Go, TypeScript (Effect), C, JavaScript, SQL, Python, Bun, Hono, Turborepo, Supabase, Redis, PostgreSQL, Docker, Cloudflare Edge.