Jul 1, 2026
How the access edge injects DHCP Option 82 for IPoE authentication on a BNG- DHCP Relay and packet sniffing at the BNG.
Saphal K. Poudyal
Systems & Infrastructure Engineer
I build the infrastructure underneath the internet — broadband gateways, network observability, and the distributed systems that keep them honest.
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About
I'm a systems and infrastructure engineer. I've written a vBNG emulator to see exactly how an ISP authenticates a subscriber, and a decentralized observability platform to localize faults across managed networks — largely because I wanted to understand how the machinery actually works. That curiosity has a way of ending up in production.
Day to day I work across Go, distributed systems, cloud infrastructure, and the control and data planes of ISP networking.
The service powering this is written in C++. See how it works
Writing
Where I take systems apart and write down what I find. More at blogs.saphal.me .
Feb 28, 2026
How Broadband Network Gateways (BNGs) power ISP infrastructure — control plane, data plane, RADIUS authentication, and PPPoE/IPoE — explained through Aether, my Python-based vBNG emulation.
Projects
Cepheus saphalpdyl/cepheus
A distributed network observability platform utilizing edge-endpoint geometry to achieve high-precision path fault localization across managed networks.
Aether saphalpdyl/aether
Interactive simulation of an ISP's Broadband Network Gateway (BNG) and core networking.
osvbng veesix-networks/osvbng
Re-inventing the modern ISP BNG. Built on-top of VPP, FRR and DPDK.
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daytona daytonaio/daytona
Daytona is a Secure and Elastic Infrastructure for Running AI-Generated Code
Melo saphalpdyl/melo
Interactive virtual spaces for remote teams to work, and connect powered by Three and WebRTC.
NoRA saphalpdyl/nora
Undetectable elocution coach that analyzes conversation in real time and responds through haptics
Experience
Show 7 roles ↓
Software Engineer, Systems & Infrastructure Aquaview — an initiative by the National Oceanic and Atmospheric Administration (NOAA)
Jan 2026 — Present GoGCPDistributed systemsConnectRPCProtobufsMongoDBDDDOpenTelemetryDocker
- — Extracted sandbox provisioning into a standalone Go microservice exposing 9 RPC endpoints across 2 ConnectRPC services, supporting up to 165 concurrent sandboxes across isolated user and automated execution pools.
- — Designed a supervisor actor-model in Go with a size-64 inbox channel and semaphore-bounded worker goroutines, eliminating shared-state contention across all concurrent RPC handlers.
- — Built a stale-data reconciliation pipeline handling divergence between the Daytona provider and local registry, covering both orphaned and ghost snapshot edge cases.
- — Introduced a full local observability stack with OpenTelemetry, Grafana, Loki, and Tempo — wiring distributed tracing through ConnectRPC and MongoDB with trace-log correlation.
Founding Engineer MagnoliaEd LLC — a Microsoft-powered startup
Aug 2025 — Nov 2025 AWSTerraformFastAPIPostgreSQLNext.jsTurborepoDockerCI/CD
- — Led end-to-end product development, securing $50,000 in seed funding and driving the startup from concept to execution.
- — Architected and provisioned resilient AWS infrastructure, cutting operational cost by over 60% through deliberate trade-offs between managed and self-managed services.
- — Engineered a modular FastAPI backend designed for scalability while keeping early-stage operations lean.
- — Built a multi-app Turborepo + Next.js frontend with shared logic and design, cutting deployment times by 50% through smart caching.
- — Designed robust API contracts and database schemas for seamless integration across the modular backend and unified data layer.
.NET Core & Machine Learning Intern Prediction3D Technologies
May 2025 — Aug 2025 C#.NET CoreLangChainLangGraphSupabaseOAuth2Machine Learning
- — Architected graph-based LLM orchestration with LangGraph/LangChain, implementing a multi-agent supervisor workflow and RAG for the customer-support platform.
- — Implemented hybrid OAuth2 authentication using FedCM with PKCE fallback, integrating the Supabase identity provider with the .NET API for cross-browser compatibility and clean UX.
- — Built stateful conversation management with database checkpointing, enabling context-aware multi-turn interactions and persistent history.
Undergraduate Research Assistant University of Southern Mississippi — Construction & Design
Nov 2024 — Dec 2025 UnityBlenderSubstance PainterMaterializeGoogle Apps Script
- — Developed a research-based interactive gaming environment in Unity using Blender, Adobe Substance Painter, and Materialize.
- — Reviewed and filtered inputs to provide quality data for research purposes.
- — Created an AI-powered automated dev-log workflow in Google Workspace via Apps Script, reducing review time by 17% (~7 minutes).
Flutter Developer BTech Ltd.
May 2024 — Aug 2024 FlutterDartClean ArchitectureSOLIDERP Systems
- — Developed a Flutter-based ERP system following Clean Architecture and SOLID principles for efficient, scalable, domain-oriented code.
- — Implemented journal entries, ledgers, inventory management, billing, and multiple financial reports.
- — Managed timelines and deliverables to ensure high-quality results, completing the project 11 days ahead of deadline.
- — Collaborated with the client to gather requirements, give regular updates, and incorporate feedback.
Django Instructor Sipalaya Infotech Pvt. Ltd.
Oct 2023 — Jul 2024 DjangoPython
- — Delivered a Django programming course across 3 cohorts; 9 students landed internships within a month of completion.
- — Developed and presented course materials, translating fast-moving concepts into teachable form.
Full-stack Python Developer Intern Sipalaya Infotech Pvt. Ltd.
Oct 2023 — Apr 2024 PythonDjangoPostgreSQLReactReduxZustandREST APIsCI/CD
- — Built the end-to-end CRM admin web application for ISP Beni Communications using Django, PostgreSQL, and React with Redux and Zustand, testing APIs with Postman.
- — Translated PHP-based REST APIs into scalable Django implementations.
- — Reformed the billing system with keyboard shortcuts and macros, improving user experience by 30%.
- — Re-documented 99% of the views and service functions using PyDoc under test-driven development.
- — Maintained continuous integration through GitHub Actions and Django Tests, coordinating via Jira.