Open to opportunities

Nirajan Sah

@nirajansah

Message

Backend-focused Software Engineer building production AI systems and scalable, secure platforms.

Nepal

Message

What I'm looking for

I’m looking for backend and AI-focused work where I can build production-grade, secure, cloud-native systems—especially multi-tenant platforms, agentic workflows, and reliable APIs—while shipping measurable improvements end to end.

I’m a Software Engineer specializing in backend architecture and production AI systems. I’ve architected multi-tenant AI platforms, agentic AI infrastructure, and high-performance backend services that power enterprise applications, with a focus on secure tool execution, reusable orchestration, and independent service scalability.

In my most recent role, I built Yantra, a multi-tenant AI operating system with an API gateway, product agents, an MCP hub, and shared AI runtime. I also developed resilient document generation with Flask and PostgreSQL (including a signature placement approach) and implemented custom RBAC for multi-tenant access, plus security hardening by fixing an IDOR vulnerability. I’m equally comfortable shipping cloud-native services with AWS (and OVHcloud), integrating LLM/OCR workflows via tools like n8n, Pinecone, and Mistral, and delivering end-to-end systems through robust API and streaming pipelines.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer (Backend + AI)

Current

Lexflow

Sep 2025 - Present (11 months)

Architected and built Yantra, a multi-tenant AI operating system powering product-specific AI agents through a unified gateway, including modular orchestration and a shared AI runtime. Implemented legal document generation with Flask/PostgreSQL and added secure multi-tenant access via RBAC, alongside AI workflow integrations and security fixes.

API Gateway Agentic AI MCP Flask SQLAlchemy PostgreSQL Alembic WeasyPrint DocuSeal RBAC Mistral AI Pinecone WhatsApp Business API IDOR Prevention

Full Stack Engineer

Upwork

May 2025 - Aug 2025 (3 months)

Developed a PDF editing MVP that supports upload, edit, compress, convert, and merge PDFs using modern web tooling and secure file handling. Built a location-based restaurant discovery app using Google Places API and real-time geolocation.

Next.js Secure File Handling Auto Deletion Geolocation

Software Engineer

NebulaLeap Technology

Nov 2023 - Mar 2025 (1 year 4 months)

Built scalable backend systems for education and tutoring platforms, including caching and payment integration, and designed serverless architectures for high user loads. Developed real-time communication features using Kafka/Redis and contributed to an edtech platform using React/Tailwind CSS and Strapi CMS.

Redis AWS Lambda Khalti Payment Gateway Serverless Architecture Kafka Real Time Sockets React Tailwind Strapi Backend

Full-Stack Web Dev (MERN)

Incubate Nepal

Jun 2022 - Sep 2022 (3 months)

Built a map-based website to locate, document, and visualize 200+ Nepalese heritage sites not available online, supporting cultural preservation. Was selected among the top 30 of 1,100+ applicants for a research program.

MERN Stack Data Visualization Web Development

Education

Degrees, certifications, and relevant coursework

Institute of Engineering, Pulchowk Campus

Bachelor of Engineering, Computer Engineering

2022 - 2026

Pursuing a Bachelor of Engineering in Computer Engineering (2022–2026). Coursework includes DBMS, Data Structures & Algorithms, Operating Systems, Distributed Systems, Generative AI, DevOps, and Software Engineering.

Amazon Web Services (AWS)

AWS Certified Solutions Architect – Associate, Cloud Computing

2025 - 2025

Earned the AWS Certified Solutions Architect – Associate certification (Jul 2025).

NAAMII AI School

AI Scholar (NAAMII AI 2023), Artificial Intelligence

2023 - 2023

Completed a 10-day intensive AI training program as an AI Scholar. Covered machine learning fundamentals, data preprocessing, and AI model building through lectures, labs, and projects.

FuseMachine

AI Fellow, Advanced Artificial Intelligence

2023 - 2023

Completed an Advanced AI training program as an AI Fellow from March to September 2023. Worked on 5+ hands-on projects across EDA, Machine Learning, Computer Vision, and LLMs.

Incubate Nepal

MERN Full-Stack Web Developer (Part-Time), Full-Stack Web Development (MERN)

2022 - 2022

Part-time MERN full-stack web developer program focused on building a research project website. Developed a map-based platform to locate, document, and visualize 200+ Nepalese heritage sites.