Side effects: Increased dopamine, spontaneous smiling, uncontrollable scrolling
Hello, I’m Sajjan Karna — a full-stack developer with 5+ years of building real products, solving real problems, and shipping code that doesn’t fall apart under pressure. I architect scalable systems, design clean frontends, and write TypeScript like it’s a second language.
I work across the entire stack with a focus on performance,reliability,and clean engineering practices.
Microservices, event-driven architecture, serverless systems, caching strategies, database indexing, performance optimization, and high-availability design.
React, Next.js, React Native, TypeScript, Redux, Framer Motion, Tailwind CSS, SASS, Material-UI, Shadcn — building responsive, performant, and maintainable interfaces.
Node.js, Express.js, Fastify, PostgreSQL, MySQL, MongoDB, SQLite, Prisma ORM, Drizzle, Redis, Firebase — designing robust APIs (REST & GraphQL), real-time systems (WebSockets), and secure authentication flows.
Docker, Nginx, AWS, GCP, DigitalOcean, Vercel, Netlify, Heroku — implementing CI/CD pipelines (Jenkins, GitHub Actions) for reliable production deployments.
Jest, Mocha, Chai, Cypress, React Testing Library — promoting TDD/BDD, unit/integration/e2e testing to ensure code reliability.
Git & GitHub, code reviews, technical leadership, mentoring junior developers, and defining coding standards & best practices.
OWASP best practices, JWT/OAuth2, data encryption, logging, monitoring, alerting, and production issue debugging.
I have worked with various companies and clients to deliver high-quality software solutions.
Project Lead Developer
Sep 2025 - Present
Leading a high-performing team to deliver end-to-end project development with strong collaboration and ownership. Successfully delivered Phase 1 of a project on schedule through agile planning, effective task delegation, and consistent communication. Spearheaded the development of a 3D-based Canvas Printing Editor, architected as modular microservices for scalability, performance, and seamless integration. Participate in client and PM discussions to review progress and clarify technical requirements. Tech stack includes: Three.js, React, Node.js, Microservices, SaaS development.
Full Stack Developer
Apr 2025 - Present
Contributed to OSOM (Overseas Student Operation & Management), a scalable multi-tenant platform for international student consultancy operations. Implemented blog management, WhatsApp Cloud API onboarding, interviews and follow-up automation, AI-driven insights using LLMs, and NFC-based mobile payment prototypes. Built chat systems and integrated full-text search using Postgres. Actively participated in code reviews, mobile app support, and cross-team collaboration. Tech stack includes: React, TypeScript, Node.js, Express, PostgreSQL, Redis, React Native, WebSockets, DigitalOcean.
Project Lead Developer
Sep 2025 - Dec 2025
Developed a full-stack website for the Department of Computer Science. Designed a responsive landing page with optimized UX, handled backend form submissions for 300+ users, and deployed the project with CI/CD integration. Collaborated with faculty to align functionality and design with departmental goals. Tech stack includes: React, PostgreSQL.
Full Stack Engineer
Aug 2024 - May 2025
Worked on projects in trekking, education, and event management. Developed responsive web interfaces, robust backend systems, and mobile apps using React.js, Next.js, Node.js, Express.js, Strapi, and React Native. Participated in code reviews, knowledge sharing, and collaborated with cross-functional teams to ensure timely delivery and high-quality outcomes. Tech stack includes: React.js, Next.js, Node.js, Express.js, React Native, AWS, DigitalOcean, Docker.
Frontend Engineer
Nov 2024 - Apr 2025
Built intuitive chat systems to enhance real-time communication and collaborated with AI team to improve agent report generation efficiency by 20%. Optimized frontend performance, accessibility, and scalability. Implemented responsive UI, smooth authentication flows, and role-based access control. Tech stack includes: React.js, Redux, Tailwind CSS, Next.js, Microsoft Azure.
Backend Engineer
Aug 2024 - Dec 2024
Built and customized content management solutions using Strapi, ensuring efficient data flow and system scalability. Trained staff on platform usage for managing trip details and customer data. Tech stack includes: Node.js, Strapi, Nginx, PM2, Linux.
Full Stack Engineer
May 2024 - Jul 2024
Designed and implemented robust backend systems while optimizing the frontend interface. Managed complex system integrations and ensured scalability, security, and performance. Tech stack includes: Node.js, Strapi, Docker, DigitalOcean, CI/CD, Nginx, PM2.
Full Stack Engineer
Mar 2024 - Jun 2024
Developed a website to expand product sales, increasing revenue by 20%. Built a responsive web platform using React.js, Next.js, TypeScript, and Contentful.
Full Stack Engineer
Oct 2023 - Feb 2024
Directed the creation of website and mobile app, improving digital presence and increasing customer inquiries by 35%. Developed responsive, intuitive platforms for better user experience. Tech stack includes: React.js, React Native, Redux, DigitalOcean.
Founder & Full Stack Developer
Apr 2022 - Sep 2023
Built a full-stack rental platform from scratch, handling system design, security, and scalability. Collaborated with a small team to develop a production-level platform. Launched the startup successfully, ranking in the top 50 of Nepal KMII and 2nd in SET exhibition out of 113 projects. Tech stack includes: React.js, Next.js, Node.js, Express.js, PostgreSQL, React Native, AWS, Google Maps, WordPress, Cloudinary.
Frontend Developer
Dec 2022 - Jan 2023
Developed a WordPress-based platform for online presence and manpower tracking. Collaborated with management to implement feature requirements. Tech stack includes: WordPress, Web Development.
Content Creator
2019 - Present
Create tutorials and content on full-stack development, covering frontend and backend topics. Engaged with a community of learners, helping over 100,000 viewers understand coding concepts and full-stack application development.