Sajan AcharyaLead Software Engineer in Nepal
Lead Software Engineer & Full Stack / MERN Stack Developer building scalable SaaS, APIs, and cloud systems from Kathmandu.
6+ Years Experience · Node.js · React · NestJS · AWS
About Me
Full storyResults-driven Lead Software Engineer in Nepal with 6+ years designing, developing, and deploying scalable web applications. Expert in Node.js, React.js, and Nest.js with deep experience in microservices, REST, GraphQL, and both SQL (MySQL, PostgreSQL) and NoSQL (MongoDB) databases.
Proven track record as a Senior Full Stack Developer in Nepal building high-traffic SaaS platforms, CRM, HRMS systems, ERP solutions, and AI-integrated products — with AWS, Docker, Redis, Kafka, and Elasticsearch in production.
Strong team leader mentoring engineers and driving Agile delivery. Passionate about clean code, system design, and continuous learning. Explore case studies or the engineering blog.
Services
Dedicated offerings for teams hiring a mern stack developer, full stack owner, or specialized React, Next.js, and Node.js engineer.
MERN Stack Developer
End-to-end MERN development for SaaS, portals, and APIs — from MongoDB schema design to React UX and Node.js services.
Learn moreFull Stack Developer
Frontend, backend, and infrastructure ownership for web products that need speed without sacrificing quality.
Learn moreSoftware Developer
Senior software engineering for complex products — system design, clean code, and cloud-ready delivery.
Learn moreReact Developer
Production-grade React applications with accessible UI, solid state management, and maintainable component architecture.
Learn moreNext.js Developer
Next.js applications optimized for performance, SEO, and developer experience — from marketing sites to full products.
Learn moreNode.js Developer
Robust Node.js backends — APIs, workers, and microservices designed for throughput and maintainability.
Learn moreTechnical Skills
View allLanguages
JavaScript (ES6+)TypeScriptPythonCC++
Frontend
ReactNext.jsRedux (RTK Query)Tailwind CSSHTML5CSS3
Backend
Node.jsExpress.jsNestJSREST APIGraphQLLoopBack
Databases
MongoDBMySQLPostgreSQLRedisElasticsearchDynamoDBRDS
Messaging & Streaming
Apache KafkaWebSocket
Cloud & DevOps
AWS (EC2, ECR, EKS, ECS, S3, RDS, Lambda, Amplify)DockerGitCI/CD
ORM / Query Builders
PrismaMongooseDrizzle
Testing
JestMochaChaiSupertestTDDUnit TestingIntegration Testing
Methodologies
AgileScrumKanbanMicroservices ArchitectureSaaSMulti-Tenancy
Integrations
Xero AccountingStripe PaymentsGen AI / LLM APIs
Professional Experience
View allLead Software Engineer
Plexbit Infosystems
Apr 2026 – Present
- •Lead end-to-end architecture and delivery of enterprise-grade products for international clients
- •Own technical decision-making across multiple concurrent projects, setting engineering standards for scalability, security, and code quality
- •Drive cross-functional collaboration between engineering, product, and data teams to ship high-impact features on schedule
- •Mentor a team of engineers through design reviews and technical planning sessions to raise overall team output
Senior Software Engineer
Dome Infosys
Jun 2024 – Mar 2026
- •Led full-stack development of scalable SaaS and microservices-based applications using the MERN stack
- •Architected high-availability backend systems serving thousands of concurrent users with optimized API response times
- •Led cross-functional teams across frontend, backend, and AI engineering to deliver end-to-end product features on schedule
- •Conducted weekly technical learning sessions and mentored junior engineers on Node.js, React.js, and system design
- •Drove code quality standards through structured code reviews, documentation, and TDD practices
Software Engineer
Cloud Tech Service
Jun 2023 – May 2024
- •Developed and maintained full-stack web applications using Node.js, Express.js, and React.js with MySQL and MongoDB
- •Designed and implemented RESTful APIs and microservices for distributed, high-availability systems
- •Built and optimized complex database schemas, improving query performance and data integrity across relational and NoSQL databases
- •Collaborated with cross-functional Agile teams in sprint planning, daily standups, and retrospectives to ensure timely delivery
Software Engineer
Kitwosd IT Support Center
Jun 2021 – Jun 2023
- •Designed and developed full-stack applications using the MERN stack (MongoDB, Express.js, React.js, Node.js)
- •Implemented real-time features including live notifications and collaborative tools using WebSocket
- •Created efficient, normalized database schemas for relational (MySQL) and NoSQL (MongoDB) databases
- •Built and consumed RESTful APIs supporting mobile and web client applications
Featured Projects
View allCoachHQ – AI-Led Multi-Sport Coaching Platform
Next.jsReact.jsNode.jsOpenAI / Gen AIStripeFirebaseZoomAWS CloudFront
- ✓Built an expert drill library across multiple sports with HD video demonstrations, coaching points, technique breakdowns, and common mistakes
- ✓Delivered a session and playlist builder to add drills by category, set durations, preview, and save or export ready-to-use training plans
- ✓Integrated an AI coaching assistant with natural language search and intelligent drill recommendations
- ✓Enabled sharing of playlists and session plans between coaches and assistants for collaborative programme building
- ✓Implemented Stripe subscription checkout with launch pricing, promo codes, and athlete training passes
- ✓Added live coaching webinars with registration and recorded sessions, plus a companion mobile app for training on the go
Jobscater.com – Job Portal Platform
Node.jsExpress.jsReact.jsMongoDBRedisKafkaElasticsearchMicroservicesGen AI
- ✓Architected a scalable microservices backend for high-volume job posting, application management, and user workflows, serving users across 10+ countries including a flagship Dubai-based deployment
- ✓Implemented real-time chat and email notification services on Apache Kafka, reducing notification latency by decoupling services
- ✓Designed Elasticsearch-powered full-text search for fast, relevance-ranked job discovery across millions of listings
- ✓Integrated Generative AI APIs for intelligent applicant screening and a personalized job recommendation engine, improving match quality
- ✓Built centralized logging and monitoring services for real-time observability across all microservices
Multi-Tenant HRMS – International Client (SaaS)
React.jsNext.jsNode.jsExpress.jsMongoDBRedisWebSocketRTK QueryTailwind CSS
- ✓Designed a fully multi-tenant HRMS SaaS delivering employee management, attendance, payroll, and leave workflows for multiple organizations from a single, secure deployment
- ✓Engineered strict tenant-based data isolation in MongoDB, guaranteeing zero data leakage across organizations
- ✓Delivered real-time attendance updates and push notifications via WebSocket for live workforce visibility
- ✓Built a granular RBAC system for precise permission management across admin, manager, and employee roles
- ✓Designed a configurable payroll and overtime calculation engine adaptable to each organization's business rules
CRM with Generative AI – US Based
Node.jsExpress.jsReact.jsMongoDBPostgreSQLGen AI / LLM
- ✓Built a CRM platform managing the full sales pipeline from lead capture through deal closure
- ✓Integrated Generative AI for automated sales analysis, surfacing actionable insights from customer interactions and pipeline data
- ✓Developed AI-driven lead analysis and scoring to help sales teams prioritize high-potential leads and improve conversion rates
- ✓Designed dashboards and reporting views giving sales leadership real-time visibility into pipeline health and performance trends
Enterprise ERP System – DAT Consultancy (Dubai)
NestJSPrismaPostgreSQLRedisGraphQLAWSXero
- ✓Designed and built a full-featured ERP backend covering inventory, sales orders, customer management, and financial reporting using NestJS and Prisma
- ✓Implemented a GraphQL API layer for flexible, efficient querying of inventory and stock data, reducing over-fetching for complex dashboards
- ✓Integrated a Redis caching layer for frequently accessed catalog and inventory data, significantly cutting average API response time
- ✓Connected the Xero accounting API to automate invoicing, payment reconciliation, and financial reporting workflows
- ✓Deployed on AWS (EC2, RDS, S3) with auto-scaling for high availability and fault tolerance
File Management System – US-Based Company
Node.jsExpress.jsReact.jsMongoDBKafkaWebSocket
- ✓Built a secure document management platform for agent commission files with version control and full audit logging
- ✓Designed an optimized MongoDB schema for fast document retrieval, metadata filtering, and bulk operations across large collections
- ✓Implemented Kafka-based event-driven pipelines for asynchronous file processing and downstream notifications
- ✓Collaborated with the data engineering team on structured data management and pipeline design for reliable data flow into downstream systems
- ✓Developed real-time progress notifications via WebSocket for long-running upload and processing operations
- ✓Delivered a responsive React.js frontend with drag-and-drop upload, document preview, and advanced filtering
POS System – Billing, Purchase & Inventory
Node.jsExpress.jsReact.jsPostgreSQLRedux (RTK Query)Tailwind CSS
- ✓Built role-based access control (RBAC) with granular permissions for admin, manager, and cashier roles across every module
- ✓Implemented fiscal year management with year-wise bill numbering, opening and closing of fiscal years, and period-scoped reporting
- ✓Developed purchase bills with configurable bill terms (discounts, VAT, and additional charges) that automatically update stock and payable amounts
- ✓Built purchase returns linked to original bills, reversing stock and bill terms accurately
- ✓Delivered a fast POS sales screen with product search, multiple payment modes, and printable invoices, plus sales returns against original invoices
- ✓Designed master data management for products, categories, units, suppliers, and customers, including product pricing and stock tracking
- ✓Created sales analytics dashboards with product-wise, period-wise, and customer-wise reports to track revenue and top-selling items