Hi, I'm Bibek Kumar Sah.Software Engineer & .NET Specialist
With 3+ years of experience across the .NET ecosystem (ASP.NET Core), Microsoft SQL Server database optimization, and hands-on vulnerability assessments (VAPT). Currently building AI exam proctoring and video streaming CDN solutions at Darvilab.
Bibek Kumar Sah
B.TechEngineering reliable backend and security solutions from Kathmandu. Focused on clean architecture and high-availability systems.
Background, Culture & Engineering Philosophy
A personal look at my journey from Siraha, Nepal, to engineering secure, high-performance web systems.
“Good software isn’t about flashy complexity—it is about quiet reliability, treating security as a non-negotiable habit, and taking pride in building systems people can depend on every single day.”
From Siraha to Scalable Systems
Growing up in Siraha, Nepal, I was taught early on that respect is earned through honesty, patience, and doing the hard work even when no one is watching. When I moved to Rajkot to study Computer Engineering at RK University, that same work ethic guided me through every late-night coding session, algorithm challenge, and system architecture project—eventually graduating with a 9.15 CGPA and ranking 2nd in the university hackathon.
Today, whether I am hardening an enterprise application against OWASP vulnerabilities, tuning database queries for thousands of pension beneficiaries, or deploying video streaming CDNs, I carry that same mindset. I don’t believe in cutting corners. I believe in writing code that is clean, readable, well-tested, and secure by default.
How I Work & Collaborate
Core Engineering Focus
Integrity & Work Ethic
“Honest dedication to the problem at hand.”
Grounded in my upbringing in Nepal. Treating every project, team member, and line of code with genuine care and dedication.
Defensive Security
“An insecure system is an incomplete system.”
Hands-on experience in OWASP Top 10 mitigation, Burp Suite, SQLMap, and WAF tuning to protect user data from real-world exploitation.
Production Resilience
“Engineered for real-world reliability.”
Proven track record scaling backends in ASP.NET Core, optimizing SQL Server queries by 25%, and automating GitLab CI/CD pipelines.
Featured Engineering Projects
Selected production systems I've architected and contributed to across .NET Core enterprise apps, AI proctoring, video CDNs, and CI/CD pipelines.
Kaazii
Enterprise multi-tenant project management and HR platform with PostgreSQL schema isolation, Django REST Framework, and Next.js 16.
Retirement Benefits Management System
Enterprise pension management platform with OCR integration, WAF security, and 20-25% faster data processing.
AI Exam Proctoring Service
Real-time online exam monitoring service with AI-based anomaly detection for Learning Management Systems.
Low-Latency Video Streaming CDN
Scalable Content Delivery Network architecture supporting smooth video delivery for online courses and live streams.
DevOps Automation & SCM Modernization
End-to-end migration from SVN to self-hosted GitLab with Jenkins CI/CD and SonarQube quality enforcement.
System Architecture & Performance Console
Interact directly with simulations of systems I've built: run an OWASP security audit, benchmark CDN latency, or inspect batch calculation optimization.
OWASP Top 10 Automated Penetration Test
Simulates penetration testing routines run with Burp Suite and SQLMap against backend APIs.
Work Experience & Education
A detailed record of my production engineering roles, academic achievements, and industry certifications.
Work Experience
Download CVSoftware Engineer
Architecting and engineering enterprise multi-tenant platforms (Kaazii), AI-powered online exam proctoring, and low-latency video streaming CDN architectures.
- ▹Architected and Built Kaazii: Designed and developed an enterprise-grade multi-tenant project management and HR operations platform using Django REST Framework and Next.js 16 (App Router). Implemented PostgreSQL schema-based isolation (schema_{org_code}), JWT RS256 authentication, Redis WebSocket channels, and MinIO S3 object storage.
- ▹Developed and Implemented AI Exam Proctoring Service: Built a robust remote proctoring service for the Learning Management System (LMS) with real-time video/audio streaming and computer vision anomaly detection to prevent exam cheating.
- ▹Architected Low-Latency Video Streaming CDN: Configured edge caching and adaptive bitrate video delivery across AWS S3 and CloudFront, reducing video buffer latency by 45% for online learners.
- ▹Enforced Code Quality & CI/CD Standards: Established rigorous pre-commit and pre-push quality gates using Lefthook, Biome, Pytest, and strict TypeScript verification ensuring zero regressions.
Software Engineer
Developed enterprise web applications with ASP.NET Core, conducted OWASP vulnerability assessments, and optimized relational database systems.
- ▹Conducted Vulnerability Assessment and Penetration Testing (VAPT) aligned with OWASP security best practices, successfully identifying and remediating critical XSS, SQL Injection, and Insecure Deserialization flaws.
- ▹Engineered core business logic and database functionality for enterprise retirement benefits software, increasing processing speed by 20-25% for 5,000+ users.
- ▹Designed, optimized, and maintained complex relational databases using Microsoft SQL Server and stored procedures.
- ▹Enhanced dynamic user interfaces with JavaScript and React, improving usability and response times.
- ▹Collaborated across engineering and business teams to ensure all implementations aligned with rigorous regulatory and security standards.
Intern (Python for AI/ML)
Conducted data preprocessing, feature engineering, and model evaluation to improve prediction accuracy for AI/ML projects.
- ▹Implemented data cleaning, normalization, and feature extraction pipelines in Python.
- ▹Evaluated machine learning regression and classification models to ensure reliable project outcomes.
Education
B.Tech in Computer Engineering
Graduated with distinction (9.15 CGPA). Deep coursework in Data Structures, Algorithms, Secure Software Engineering, Relational Databases, and Network Security.
Higher Secondary (Science)
Completed secondary education with focus on Physics, Chemistry, and Advanced Mathematics, developing strong analytical and problem-solving fundamentals.
Certificates
Key Achievement
Mobile-Code-e-Thon Hackathon
2nd Rank (University Level)Awarded 2nd position among university-wide teams for rapid application prototyping, clean architecture, and robust coding under competitive time constraints.
Skills & Engineering Competencies
Proven technical capabilities spanning backend systems, offensive/defensive security, databases, cloud CI/CD, and modern reactive interfaces.
Languages & Core
Object-oriented, backend, and script languages used across production systems.
Frameworks, Tools & Testing
Tools and frameworks for API design, automated testing, and code quality.
Cloud & Infrastructure
Cloud services, CDN deployment, and environment automation.
Database Management
Relational data modeling, query optimization, and transaction safety.
Application Security (VAPT)
Hands-on offensive testing, vulnerability remediation, and OWASP defense.
Core Computer Science Concepts
Foundational CS principles applied daily in production engineering.
Let's Start a Conversation
Whether you have an engineering role, a software consulting need, or an application security inquiry—feel free to reach out directly.
Comprehensive 2-page resume covering experience at Darvilab, Version Systems, and certifications.
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