Full-Stack Engineer (Web & Mobile) | System Design & Architecture | DevOps
Web · Mobile · Backend · System Design
📍 Remote / Global
✉️ sajjankarna.dev@gmail.com
🔗 LinkedIn · GitHub · sajjankarn.com.np · Instagram
Senior full-stack engineer with 5+ years of production experience building and scaling real-world products across web, mobile, and backend systems.
I focus on system design, long-term maintainability, and failure-aware architecture.
I care less about trends and more about what survives traffic, deadlines, and future developers.
- System design & backend architecture
- Scalable API design (REST / GraphQL)
- Data modeling & migrations
- Performance optimization & reliability
- Distributed systems debugging
- Code quality, reviews, and mentorship
- React, Next.js, React Native
- TypeScript
- Tailwind CSS
- Redux / Zustand (used deliberately)
- Framer Motion (UX polish only)
- Node.js (deep runtime understanding)
- Fastify, Express
- REST, GraphQL
- WebSockets, background jobs, queues
- Authentication, RBAC, rate limiting
- PostgreSQL, MySQL, MongoDB
- Prisma, Drizzle
- API versioning & backward compatibility
- Caching strategies (Redis, in-memory, edge)
- Idempotency, retries, and graceful failure
- Query planning & indexing
- Event-driven and async patterns
- Load-aware design (what breaks first)
- Docker, Nginx
- AWS (EC2, S3, Lambda)
- DigitalOcean, Vercel
- CI/CD (GitHub Actions, Jenkins)
- Zero-downtime deployments
- Structured logging
- Metrics & alerting (latency, error rate, saturation)
- Health checks & degradation strategies
- Debugging production systems calmly
Own features end-to-end, from system design to production.
Make architectural decisions that won’t age badly.
Built frontend systems for AI-driven products.
Improved performance, stability, and developer experience.
Designed and shipped web and mobile applications used by real customers.
Some increased revenue.
All handled real traffic.
- Boring systems scale better
- Clever code ages poorly
- Most bugs are design problems
- Observability beats confidence
For detailed experience, projects, and context:
👉 https://www.sajjankarn.com.np/about